Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

497 files changed, 46357 insertions, 0 deletions

diff --git a/dom/serviceworkers/FetchEventOpChild.cpp b/dom/serviceworkers/FetchEventOpChild.cpp
new file mode 100644
index 0000000000..b4a74770cd
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpChild.cpp
@@ -0,0 +1,629 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FetchEventOpChild.h"
+
+#include <utility>
+
+#include "MainThreadUtils.h"
+#include "nsContentPolicyUtils.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsIChannel.h"
+#include "nsIConsoleReportCollector.h"
+#include "nsIContentPolicy.h"
+#include "nsIInputStream.h"
+#include "nsILoadInfo.h"
+#include "nsINetworkInterceptController.h"
+#include "nsIObserverService.h"
+#include "nsIScriptError.h"
+#include "nsISupportsImpl.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsProxyRelease.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+
+#include "ServiceWorkerPrivate.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/LoadInfo.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/dom/FetchService.h"
+#include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/PRemoteWorkerControllerChild.h"
+#include "mozilla/dom/ServiceWorkerRegistrationInfo.h"
+#include "mozilla/net/NeckoChannelParams.h"
+#include "mozilla/dom/RemoteWorkerControllerChild.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+bool CSPPermitsResponse(nsILoadInfo* aLoadInfo,
+                        SafeRefPtr<InternalResponse> aResponse,
+                        const nsACString& aWorkerScriptSpec) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aLoadInfo);
+
+  nsCString url = aResponse->GetUnfilteredURL();
+  if (url.IsEmpty()) {
+    // Synthetic response.
+    url = aWorkerScriptSpec;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), url, nullptr, nullptr);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  int16_t decision = nsIContentPolicy::ACCEPT;
+  rv = NS_CheckContentLoadPolicy(uri, aLoadInfo, &decision);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  return decision == nsIContentPolicy::ACCEPT;
+}
+
+void AsyncLog(nsIInterceptedChannel* aChannel, const nsACString& aScriptSpec,
+              uint32_t aLineNumber, uint32_t aColumnNumber,
+              const nsACString& aMessageName, nsTArray<nsString>&& aParams) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aChannel);
+
+  nsCOMPtr<nsIConsoleReportCollector> reporter =
+      aChannel->GetConsoleReportCollector();
+
+  if (reporter) {
+    // NOTE: is appears that `const nsTArray<nsString>&` is required for
+    // nsIConsoleReportCollector::AddConsoleReport to resolve to the correct
+    // overload.
+    const nsTArray<nsString> params = std::move(aParams);
+
+    reporter->AddConsoleReport(
+        nsIScriptError::errorFlag, "Service Worker Interception"_ns,
+        nsContentUtils::eDOM_PROPERTIES, aScriptSpec, aLineNumber,
+        aColumnNumber, aMessageName, params);
+  }
+}
+
+class SynthesizeResponseWatcher final : public nsIInterceptedBodyCallback {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  SynthesizeResponseWatcher(
+      const nsMainThreadPtrHandle<nsIInterceptedChannel>& aInterceptedChannel,
+      const nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      const bool aIsNonSubresourceRequest,
+      FetchEventRespondWithClosure&& aClosure, nsAString&& aRequestURL)
+      : mInterceptedChannel(aInterceptedChannel),
+        mRegistration(aRegistration),
+        mIsNonSubresourceRequest(aIsNonSubresourceRequest),
+        mClosure(std::move(aClosure)),
+        mRequestURL(std::move(aRequestURL)) {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+    MOZ_ASSERT(mRegistration);
+  }
+
+  NS_IMETHOD
+  BodyComplete(nsresult aRv) override {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+
+    if (NS_WARN_IF(NS_FAILED(aRv))) {
+      AsyncLog(mInterceptedChannel, mClosure.respondWithScriptSpec(),
+               mClosure.respondWithLineNumber(),
+               mClosure.respondWithColumnNumber(),
+               "InterceptionFailedWithURL"_ns, {mRequestURL});
+
+      CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+
+      return NS_OK;
+    }
+
+    nsresult rv = mInterceptedChannel->FinishSynthesizedResponse();
+
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      CancelInterception(rv);
+    }
+
+    mInterceptedChannel = nullptr;
+
+    return NS_OK;
+  }
+
+  // See FetchEventOpChild::MaybeScheduleRegistrationUpdate() for comments.
+  void CancelInterception(nsresult aStatus) {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+    MOZ_ASSERT(mRegistration);
+
+    mInterceptedChannel->CancelInterception(aStatus);
+
+    if (mIsNonSubresourceRequest) {
+      mRegistration->MaybeScheduleUpdate();
+    } else {
+      mRegistration->MaybeScheduleTimeCheckAndUpdate();
+    }
+
+    mInterceptedChannel = nullptr;
+    mRegistration = nullptr;
+  }
+
+ private:
+  ~SynthesizeResponseWatcher() {
+    if (NS_WARN_IF(mInterceptedChannel)) {
+      CancelInterception(NS_ERROR_DOM_ABORT_ERR);
+    }
+  }
+
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mInterceptedChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  const bool mIsNonSubresourceRequest;
+  const FetchEventRespondWithClosure mClosure;
+  const nsString mRequestURL;
+};
+
+NS_IMPL_ISUPPORTS(SynthesizeResponseWatcher, nsIInterceptedBodyCallback)
+
+}  // anonymous namespace
+
+/* static */ RefPtr<GenericPromise> FetchEventOpChild::SendFetchEvent(
+    PRemoteWorkerControllerChild* aManager,
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel> aInterceptedChannel,
+    RefPtr<ServiceWorkerRegistrationInfo> aRegistration,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+    RefPtr<KeepAliveToken>&& aKeepAliveToken) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aManager);
+  MOZ_ASSERT(aInterceptedChannel);
+  MOZ_ASSERT(aKeepAliveToken);
+
+  FetchEventOpChild* actor = new FetchEventOpChild(
+      std::move(aArgs), std::move(aInterceptedChannel),
+      std::move(aRegistration), std::move(aPreloadResponseReadyPromises),
+      std::move(aKeepAliveToken));
+
+  actor->mWasSent = true;
+  RefPtr<GenericPromise> promise = actor->mPromiseHolder.Ensure(__func__);
+  Unused << aManager->SendPFetchEventOpConstructor(actor, actor->mArgs);
+  // NOTE: actor may have been destroyed
+  return promise;
+}
+
+FetchEventOpChild::~FetchEventOpChild() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannelHandled);
+  MOZ_DIAGNOSTIC_ASSERT(mPromiseHolder.IsEmpty());
+}
+
+FetchEventOpChild::FetchEventOpChild(
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel>&& aInterceptedChannel,
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+    RefPtr<KeepAliveToken>&& aKeepAliveToken)
+    : mArgs(std::move(aArgs)),
+      mInterceptedChannel(std::move(aInterceptedChannel)),
+      mRegistration(std::move(aRegistration)),
+      mKeepAliveToken(std::move(aKeepAliveToken)),
+      mPreloadResponseReadyPromises(std::move(aPreloadResponseReadyPromises)) {
+  if (mPreloadResponseReadyPromises) {
+    // This promise should be configured to use synchronous dispatch, so if it's
+    // already resolved when we run this code then the callback will be called
+    // synchronously and pass the preload response with the constructor message.
+    //
+    // Note that it's fine to capture the this pointer in the callbacks because
+    // we disconnect the request in Recv__delete__().
+    mPreloadResponseReadyPromises->GetResponseAvailablePromise()
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [this](FetchServiceResponse&& aResponse) {
+              if (!mWasSent) {
+                // The actor wasn't sent yet, we can still send the preload
+                // response with it.
+                mArgs.preloadResponse() =
+                    Some(aResponse->ToParentToParentInternalResponse());
+              } else {
+                // It's too late to send the preload response with the actor, we
+                // have to send it in a separate message.
+                SendPreloadResponse(
+                    aResponse->ToParentToParentInternalResponse());
+              }
+              mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            },
+            [this](const CopyableErrorResult&) {
+              mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseAvailablePromiseRequestHolder);
+
+    mPreloadResponseReadyPromises->GetResponseTimingPromise()
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [this](ResponseTiming&& aTiming) {
+              if (!mWasSent) {
+                // The actor wasn't sent yet, we can still send the preload
+                // response timing with it.
+                mArgs.preloadResponseTiming() = Some(std::move(aTiming));
+              } else {
+                SendPreloadResponseTiming(aTiming);
+              }
+              mPreloadResponseTimingPromiseRequestHolder.Complete();
+            },
+            [this](const CopyableErrorResult&) {
+              mPreloadResponseTimingPromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseTimingPromiseRequestHolder);
+
+    mPreloadResponseReadyPromises->GetResponseEndPromise()
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [this](ResponseEndArgs&& aResponse) {
+              if (!mWasSent) {
+                // The actor wasn't sent yet, we can still send the preload
+                // response end args with it.
+                mArgs.preloadResponseEndArgs() = Some(std::move(aResponse));
+              } else {
+                // It's too late to send the preload response end with the
+                // actor, we have to send it in a separate message.
+                SendPreloadResponseEnd(aResponse);
+              }
+              mPreloadResponseReadyPromises = nullptr;
+              mPreloadResponseEndPromiseRequestHolder.Complete();
+            },
+            [this](const CopyableErrorResult&) {
+              mPreloadResponseReadyPromises = nullptr;
+              mPreloadResponseEndPromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseEndPromiseRequestHolder);
+  }
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::RecvAsyncLog(
+    const nsCString& aScriptSpec, const uint32_t& aLineNumber,
+    const uint32_t& aColumnNumber, const nsCString& aMessageName,
+    nsTArray<nsString>&& aParams) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+
+  AsyncLog(mInterceptedChannel, aScriptSpec, aLineNumber, aColumnNumber,
+           aMessageName, std::move(aParams));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::RecvRespondWith(
+    ParentToParentFetchEventRespondWithResult&& aResult) {
+  AssertIsOnMainThread();
+
+  RefPtr<RemoteWorkerControllerChild> mgr =
+      static_cast<RemoteWorkerControllerChild*>(Manager());
+
+  mInterceptedChannel->SetRemoteWorkerLaunchStart(
+      mgr->GetRemoteWorkerLaunchStart());
+  mInterceptedChannel->SetRemoteWorkerLaunchEnd(
+      mgr->GetRemoteWorkerLaunchEnd());
+
+  switch (aResult.type()) {
+    case ParentToParentFetchEventRespondWithResult::
+        TParentToParentSynthesizeResponseArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_ParentToParentSynthesizeResponseArgs()
+              .timeStamps()
+              .fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_ParentToParentSynthesizeResponseArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      SynthesizeResponse(
+          std::move(aResult.get_ParentToParentSynthesizeResponseArgs()));
+      break;
+    case ParentToParentFetchEventRespondWithResult::TResetInterceptionArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_ResetInterceptionArgs().timeStamps().fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_ResetInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      ResetInterception(false);
+      break;
+    case ParentToParentFetchEventRespondWithResult::TCancelInterceptionArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_CancelInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_CancelInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      CancelInterception(aResult.get_CancelInterceptionArgs().status());
+      break;
+    default:
+      MOZ_CRASH("Unknown IPCFetchEventRespondWithResult type!");
+      break;
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::Recv__delete__(
+    const ServiceWorkerFetchEventOpResult& aResult) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mRegistration);
+
+  if (NS_WARN_IF(!mInterceptedChannelHandled)) {
+    MOZ_ASSERT(NS_FAILED(aResult.rv()));
+    NS_WARNING(
+        "Failed to handle intercepted network request; canceling "
+        "interception!");
+
+    CancelInterception(aResult.rv());
+  }
+
+  mPromiseHolder.ResolveIfExists(true, __func__);
+
+  // FetchEvent is completed.
+  // Disconnect preload response related promises and cancel the preload.
+  mPreloadResponseAvailablePromiseRequestHolder.DisconnectIfExists();
+  mPreloadResponseTimingPromiseRequestHolder.DisconnectIfExists();
+  mPreloadResponseEndPromiseRequestHolder.DisconnectIfExists();
+  if (mPreloadResponseReadyPromises) {
+    RefPtr<FetchService> fetchService = FetchService::GetInstance();
+    fetchService->CancelFetch(std::move(mPreloadResponseReadyPromises));
+  }
+
+  /**
+   * This corresponds to the "Fire Functional Event" algorithm's step 9:
+   *
+   * "If the time difference in seconds calculated by the current time minus
+   * registration's last update check time is greater than 84600, invoke Soft
+   * Update algorithm with registration."
+   *
+   * TODO: this is probably being called later than it should be; it should be
+   * called ASAP after dispatching the FetchEvent.
+   */
+  mRegistration->MaybeScheduleTimeCheckAndUpdate();
+
+  return IPC_OK();
+}
+
+void FetchEventOpChild::ActorDestroy(ActorDestroyReason) {
+  AssertIsOnMainThread();
+
+  // If `Recv__delete__` was called, it would have resolved the promise already.
+  mPromiseHolder.RejectIfExists(NS_ERROR_DOM_ABORT_ERR, __func__);
+
+  if (NS_WARN_IF(!mInterceptedChannelHandled)) {
+    Unused << Recv__delete__(NS_ERROR_DOM_ABORT_ERR);
+  }
+}
+
+nsresult FetchEventOpChild::StartSynthesizedResponse(
+    ParentToParentSynthesizeResponseArgs&& aArgs) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+  MOZ_ASSERT(mRegistration);
+
+  /**
+   * TODO: moving the IPCInternalResponse won't do anything right now because
+   * there isn't a prefect-forwarding or rvalue-ref-parameter overload of
+   * `InternalResponse::FromIPC().`
+   */
+  SafeRefPtr<InternalResponse> response =
+      InternalResponse::FromIPC(aArgs.internalResponse());
+  if (NS_WARN_IF(!response)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIChannel> underlyingChannel;
+  nsresult rv =
+      mInterceptedChannel->GetChannel(getter_AddRefs(underlyingChannel));
+  if (NS_WARN_IF(NS_FAILED(rv)) || NS_WARN_IF(!underlyingChannel)) {
+    return NS_FAILED(rv) ? rv : NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsILoadInfo> loadInfo = underlyingChannel->LoadInfo();
+  if (!CSPPermitsResponse(loadInfo, response.clonePtr(),
+                          mArgs.common().workerScriptSpec())) {
+    return NS_ERROR_CONTENT_BLOCKED;
+  }
+
+  MOZ_ASSERT(response->GetChannelInfo().IsInitialized());
+  ChannelInfo channelInfo = response->GetChannelInfo();
+  rv = mInterceptedChannel->SetChannelInfo(&channelInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_ERROR_INTERCEPTION_FAILED;
+  }
+
+  rv = mInterceptedChannel->SynthesizeStatus(
+      response->GetUnfilteredStatus(), response->GetUnfilteredStatusText());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  AutoTArray<InternalHeaders::Entry, 5> entries;
+  response->UnfilteredHeaders()->GetEntries(entries);
+  for (auto& entry : entries) {
+    mInterceptedChannel->SynthesizeHeader(entry.mName, entry.mValue);
+  }
+
+  auto castLoadInfo = static_cast<mozilla::net::LoadInfo*>(loadInfo.get());
+  castLoadInfo->SynthesizeServiceWorkerTainting(response->GetTainting());
+
+  // Get the preferred alternative data type of the outer channel
+  nsAutoCString preferredAltDataType(""_ns);
+  nsCOMPtr<nsICacheInfoChannel> outerChannel =
+      do_QueryInterface(underlyingChannel);
+  if (outerChannel &&
+      !outerChannel->PreferredAlternativeDataTypes().IsEmpty()) {
+    preferredAltDataType.Assign(
+        outerChannel->PreferredAlternativeDataTypes()[0].type());
+  }
+
+  nsCOMPtr<nsIInputStream> body;
+  if (preferredAltDataType.Equals(response->GetAlternativeDataType())) {
+    body = response->TakeAlternativeBody();
+  }
+  if (!body) {
+    response->GetUnfilteredBody(getter_AddRefs(body));
+  } else {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::SW_ALTERNATIVE_BODY_USED_COUNT,
+                         1);
+  }
+
+  // Propagate the URL to the content if the request mode is not "navigate".
+  // Note that, we only reflect the final URL if the response.redirected is
+  // false. We propagate all the URLs if the response.redirected is true.
+  const IPCInternalRequest& request = mArgs.common().internalRequest();
+  nsAutoCString responseURL;
+  if (request.requestMode() != RequestMode::Navigate) {
+    responseURL = response->GetUnfilteredURL();
+
+    // Similar to how we apply the request fragment to redirects automatically
+    // we also want to apply it automatically when propagating the response
+    // URL from a service worker interception.  Currently response.url strips
+    // the fragment, so this will never conflict with an existing fragment
+    // on the response.  In the future we will have to check for a response
+    // fragment and avoid overriding in that case.
+    if (!request.fragment().IsEmpty() && !responseURL.IsEmpty()) {
+      MOZ_ASSERT(!responseURL.Contains('#'));
+      responseURL.AppendLiteral("#");
+      responseURL.Append(request.fragment());
+    }
+  }
+
+  nsMainThreadPtrHandle<nsIInterceptedChannel> interceptedChannel(
+      new nsMainThreadPtrHolder<nsIInterceptedChannel>(
+          "nsIInterceptedChannel", mInterceptedChannel, false));
+
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> registration(
+      new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
+          "ServiceWorkerRegistrationInfo", mRegistration, false));
+
+  nsCString requestURL = request.urlList().LastElement();
+  if (!request.fragment().IsEmpty()) {
+    requestURL.AppendLiteral("#");
+    requestURL.Append(request.fragment());
+  }
+
+  RefPtr<SynthesizeResponseWatcher> watcher = new SynthesizeResponseWatcher(
+      interceptedChannel, registration,
+      mArgs.common().isNonSubresourceRequest(), std::move(aArgs.closure()),
+      NS_ConvertUTF8toUTF16(responseURL));
+
+  rv = mInterceptedChannel->StartSynthesizedResponse(
+      body, watcher, nullptr /* TODO */, responseURL, response->IsRedirected());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
+  if (obsService) {
+    obsService->NotifyObservers(underlyingChannel,
+                                "service-worker-synthesized-response", nullptr);
+  }
+
+  return rv;
+}
+
+void FetchEventOpChild::SynthesizeResponse(
+    ParentToParentSynthesizeResponseArgs&& aArgs) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+
+  nsresult rv = StartSynthesizedResponse(std::move(aArgs));
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    NS_WARNING("Failed to synthesize response!");
+
+    mInterceptedChannel->CancelInterception(rv);
+  }
+
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+void FetchEventOpChild::ResetInterception(bool aBypass) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+
+  nsresult rv = mInterceptedChannel->ResetInterception(aBypass);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    NS_WARNING("Failed to resume intercepted network request!");
+
+    mInterceptedChannel->CancelInterception(rv);
+  }
+
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+void FetchEventOpChild::CancelInterception(nsresult aStatus) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+  MOZ_ASSERT(NS_FAILED(aStatus));
+
+  // Report a navigation fault if this is a navigation (and we have an active
+  // worker, which should be the case in non-shutdown/content-process-crash
+  // situations).
+  RefPtr<ServiceWorkerInfo> mActive = mRegistration->GetActive();
+  if (mActive && mArgs.common().isNonSubresourceRequest()) {
+    mActive->ReportNavigationFault();
+    // Additional mitigations such as unregistering the registration are handled
+    // in ServiceWorkerRegistrationInfo::MaybeScheduleUpdate which will be
+    // called by MaybeScheduleRegistrationUpdate which gets called by our call
+    // to ResetInterception.
+    if (StaticPrefs::dom_serviceWorkers_mitigations_bypass_on_fault()) {
+      ResetInterception(true);
+      return;
+    }
+  }
+
+  mInterceptedChannel->CancelInterception(aStatus);
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+/**
+ * This corresponds to the "Handle Fetch" algorithm's steps 20.3, 21.2, and
+ * 22.2:
+ *
+ * "If request is a non-subresource request, or request is a subresource
+ * request and the time difference in seconds calculated by the current time
+ * minus registration's last update check time is greater than 86400, invoke
+ * Soft Update algorithm with registration."
+ */
+void FetchEventOpChild::MaybeScheduleRegistrationUpdate() const {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mRegistration);
+  MOZ_ASSERT(mInterceptedChannelHandled);
+
+  if (mArgs.common().isNonSubresourceRequest()) {
+    mRegistration->MaybeScheduleUpdate();
+  } else {
+    mRegistration->MaybeScheduleTimeCheckAndUpdate();
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/FetchEventOpChild.h b/dom/serviceworkers/FetchEventOpChild.h
new file mode 100644
index 0000000000..0c75a399cc
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpChild.h
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_fetcheventopchild_h__
+#define mozilla_dom_fetcheventopchild_h__
+
+#include "nsCOMPtr.h"
+
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/FetchService.h"
+#include "mozilla/dom/PFetchEventOpChild.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+
+class nsIInterceptedChannel;
+
+namespace mozilla::dom {
+
+class KeepAliveToken;
+class PRemoteWorkerControllerChild;
+class ServiceWorkerRegistrationInfo;
+
+/**
+ * FetchEventOpChild represents an in-flight FetchEvent operation.
+ */
+class FetchEventOpChild final : public PFetchEventOpChild {
+  friend class PFetchEventOpChild;
+
+ public:
+  static RefPtr<GenericPromise> SendFetchEvent(
+      PRemoteWorkerControllerChild* aManager,
+      ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+      nsCOMPtr<nsIInterceptedChannel> aInterceptedChannel,
+      RefPtr<ServiceWorkerRegistrationInfo> aRegistrationInfo,
+      RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+      RefPtr<KeepAliveToken>&& aKeepAliveToken);
+
+  ~FetchEventOpChild();
+
+ private:
+  FetchEventOpChild(
+      ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+      nsCOMPtr<nsIInterceptedChannel>&& aInterceptedChannel,
+      RefPtr<ServiceWorkerRegistrationInfo>&& aRegistrationInfo,
+      RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+      RefPtr<KeepAliveToken>&& aKeepAliveToken);
+
+  mozilla::ipc::IPCResult RecvAsyncLog(const nsCString& aScriptSpec,
+                                       const uint32_t& aLineNumber,
+                                       const uint32_t& aColumnNumber,
+                                       const nsCString& aMessageName,
+                                       nsTArray<nsString>&& aParams);
+
+  mozilla::ipc::IPCResult RecvRespondWith(
+      ParentToParentFetchEventRespondWithResult&& aResult);
+
+  mozilla::ipc::IPCResult Recv__delete__(
+      const ServiceWorkerFetchEventOpResult& aResult);
+
+  void ActorDestroy(ActorDestroyReason) override;
+
+  nsresult StartSynthesizedResponse(
+      ParentToParentSynthesizeResponseArgs&& aArgs);
+
+  void SynthesizeResponse(ParentToParentSynthesizeResponseArgs&& aArgs);
+
+  void ResetInterception(bool aBypass);
+
+  void CancelInterception(nsresult aStatus);
+
+  void MaybeScheduleRegistrationUpdate() const;
+
+  ParentToParentServiceWorkerFetchEventOpArgs mArgs;
+  nsCOMPtr<nsIInterceptedChannel> mInterceptedChannel;
+  RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
+  RefPtr<KeepAliveToken> mKeepAliveToken;
+  bool mInterceptedChannelHandled = false;
+  MozPromiseHolder<GenericPromise> mPromiseHolder;
+  bool mWasSent = false;
+  MozPromiseRequestHolder<FetchServiceResponseAvailablePromise>
+      mPreloadResponseAvailablePromiseRequestHolder;
+  MozPromiseRequestHolder<FetchServiceResponseTimingPromise>
+      mPreloadResponseTimingPromiseRequestHolder;
+  MozPromiseRequestHolder<FetchServiceResponseEndPromise>
+      mPreloadResponseEndPromiseRequestHolder;
+  RefPtr<FetchServicePromises> mPreloadResponseReadyPromises;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_fetcheventopchild_h__
diff --git a/dom/serviceworkers/FetchEventOpParent.cpp b/dom/serviceworkers/FetchEventOpParent.cpp
new file mode 100644
index 0000000000..06c65f36d2
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpParent.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FetchEventOpParent.h"
+
+#include "mozilla/dom/FetchTypes.h"
+#include "nsDebug.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/FetchEventOpProxyParent.h"
+#include "mozilla/dom/FetchStreamUtils.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/RemoteWorkerControllerParent.h"
+#include "mozilla/dom/RemoteWorkerParent.h"
+#include "mozilla/ipc/BackgroundParent.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+std::tuple<Maybe<ParentToParentInternalResponse>, Maybe<ResponseEndArgs>>
+FetchEventOpParent::OnStart(
+    MovingNotNull<RefPtr<FetchEventOpProxyParent>> aFetchEventOpProxyParent) {
+  Maybe<ParentToParentInternalResponse> preloadResponse =
+      std::move(mState.as<Pending>().mPreloadResponse);
+  Maybe<ResponseEndArgs> preloadResponseEndArgs =
+      std::move(mState.as<Pending>().mEndArgs);
+  mState = AsVariant(Started{std::move(aFetchEventOpProxyParent)});
+  return std::make_tuple(preloadResponse, preloadResponseEndArgs);
+}
+
+void FetchEventOpParent::OnFinish() {
+  MOZ_ASSERT(mState.is<Started>());
+  mState = AsVariant(Finished());
+}
+
+mozilla::ipc::IPCResult FetchEventOpParent::RecvPreloadResponse(
+    ParentToParentInternalResponse&& aResponse) {
+  AssertIsOnBackgroundThread();
+
+  mState.match(
+      [&aResponse](Pending& aPending) {
+        MOZ_ASSERT(aPending.mPreloadResponse.isNothing());
+        aPending.mPreloadResponse = Some(std::move(aResponse));
+      },
+      [&aResponse](Started& aStarted) {
+        auto backgroundParent = WrapNotNull(
+            WrapNotNull(aStarted.mFetchEventOpProxyParent->Manager())
+                ->Manager());
+        Unused << aStarted.mFetchEventOpProxyParent->SendPreloadResponse(
+            ToParentToChild(aResponse, backgroundParent));
+      },
+      [](const Finished&) {});
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpParent::RecvPreloadResponseTiming(
+    ResponseTiming&& aTiming) {
+  AssertIsOnBackgroundThread();
+
+  mState.match(
+      [&aTiming](Pending& aPending) {
+        MOZ_ASSERT(aPending.mTiming.isNothing());
+        aPending.mTiming = Some(std::move(aTiming));
+      },
+      [&aTiming](Started& aStarted) {
+        Unused << aStarted.mFetchEventOpProxyParent->SendPreloadResponseTiming(
+            std::move(aTiming));
+      },
+      [](const Finished&) {});
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpParent::RecvPreloadResponseEnd(
+    ResponseEndArgs&& aArgs) {
+  AssertIsOnBackgroundThread();
+
+  mState.match(
+      [&aArgs](Pending& aPending) {
+        MOZ_ASSERT(aPending.mEndArgs.isNothing());
+        aPending.mEndArgs = Some(std::move(aArgs));
+      },
+      [&aArgs](Started& aStarted) {
+        Unused << aStarted.mFetchEventOpProxyParent->SendPreloadResponseEnd(
+            std::move(aArgs));
+      },
+      [](const Finished&) {});
+
+  return IPC_OK();
+}
+
+void FetchEventOpParent::ActorDestroy(ActorDestroyReason) {
+  AssertIsOnBackgroundThread();
+}
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/FetchEventOpParent.h b/dom/serviceworkers/FetchEventOpParent.h
new file mode 100644
index 0000000000..279a28129e
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpParent.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_fetcheventopparent_h__
+#define mozilla_dom_fetcheventopparent_h__
+
+#include "nsISupports.h"
+
+#include "mozilla/dom/FetchEventOpProxyParent.h"
+#include "mozilla/dom/PFetchEventOpParent.h"
+
+namespace mozilla::dom {
+
+class FetchEventOpParent final : public PFetchEventOpParent {
+  friend class PFetchEventOpParent;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(FetchEventOpParent)
+
+  FetchEventOpParent() = default;
+
+  // Transition from the Pending state to the Started state. Returns the preload
+  // response and response end args, if it has already arrived.
+  std::tuple<Maybe<ParentToParentInternalResponse>, Maybe<ResponseEndArgs>>
+  OnStart(
+      MovingNotNull<RefPtr<FetchEventOpProxyParent>> aFetchEventOpProxyParent);
+
+  // Transition from the Started state to the Finished state.
+  void OnFinish();
+
+ private:
+  ~FetchEventOpParent() = default;
+
+  // IPDL methods
+
+  mozilla::ipc::IPCResult RecvPreloadResponse(
+      ParentToParentInternalResponse&& aResponse);
+
+  mozilla::ipc::IPCResult RecvPreloadResponseTiming(ResponseTiming&& aTiming);
+
+  mozilla::ipc::IPCResult RecvPreloadResponseEnd(ResponseEndArgs&& aArgs);
+
+  void ActorDestroy(ActorDestroyReason) override;
+
+  struct Pending {
+    Maybe<ParentToParentInternalResponse> mPreloadResponse;
+    Maybe<ResponseTiming> mTiming;
+    Maybe<ResponseEndArgs> mEndArgs;
+  };
+
+  struct Started {
+    NotNull<RefPtr<FetchEventOpProxyParent>> mFetchEventOpProxyParent;
+  };
+
+  struct Finished {};
+
+  using State = Variant<Pending, Started, Finished>;
+
+  // Tracks the state of the fetch event.
+  //
+  // Pending:  the fetch event is waiting in RemoteWorkerController::mPendingOps
+  //           and if the preload response arrives, we have to save it.
+  // Started:  the FetchEventOpProxyParent has been created, and if the preload
+  //           response arrives then we should forward it.
+  // Finished: the response has been propagated to the parent process, if the
+  //           preload response arrives now then we simply drop it.
+  State mState = AsVariant(Pending());
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_fetcheventopparent_h__
diff --git a/dom/serviceworkers/FetchEventOpProxyChild.cpp b/dom/serviceworkers/FetchEventOpProxyChild.cpp
new file mode 100644
index 0000000000..8e437356ec
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpProxyChild.cpp
@@ -0,0 +1,280 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FetchEventOpProxyChild.h"
+
+#include <utility>
+
+#include "mozilla/dom/FetchTypes.h"
+#include "mozilla/dom/ServiceWorkerOpPromise.h"
+#include "nsCOMPtr.h"
+#include "nsDebug.h"
+#include "nsThreadUtils.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/InternalRequest.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/RemoteWorkerChild.h"
+#include "mozilla/dom/RemoteWorkerService.h"
+#include "mozilla/dom/ServiceWorkerOp.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+namespace {
+
+nsresult GetIPCSynthesizeResponseArgs(
+    ChildToParentSynthesizeResponseArgs* aIPCArgs,
+    SynthesizeResponseArgs&& aArgs) {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+
+  auto [internalResponse, closure, timeStamps] = std::move(aArgs);
+
+  aIPCArgs->closure() = std::move(closure);
+  aIPCArgs->timeStamps() = std::move(timeStamps);
+
+  PBackgroundChild* bgChild = BackgroundChild::GetOrCreateForCurrentThread();
+
+  if (NS_WARN_IF(!bgChild)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  internalResponse->ToChildToParentInternalResponse(
+      &aIPCArgs->internalResponse(), bgChild);
+  return NS_OK;
+}
+
+}  // anonymous namespace
+
+void FetchEventOpProxyChild::Initialize(
+    const ParentToChildServiceWorkerFetchEventOpArgs& aArgs) {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+  MOZ_ASSERT(!mOp);
+
+  mInternalRequest =
+      MakeSafeRefPtr<InternalRequest>(aArgs.common().internalRequest());
+
+  if (aArgs.common().preloadNavigation()) {
+    // We use synchronous task dispatch here to make sure that if the preload
+    // response arrived before we dispatch the fetch event, then the JS preload
+    // response promise will get resolved immediately.
+    mPreloadResponseAvailablePromise =
+        MakeRefPtr<FetchEventPreloadResponseAvailablePromise::Private>(
+            __func__);
+    mPreloadResponseAvailablePromise->UseSynchronousTaskDispatch(__func__);
+    if (aArgs.preloadResponse().isSome()) {
+      mPreloadResponseAvailablePromise->Resolve(
+          InternalResponse::FromIPC(aArgs.preloadResponse().ref()), __func__);
+    }
+
+    mPreloadResponseTimingPromise =
+        MakeRefPtr<FetchEventPreloadResponseTimingPromise::Private>(__func__);
+    mPreloadResponseTimingPromise->UseSynchronousTaskDispatch(__func__);
+    if (aArgs.preloadResponseTiming().isSome()) {
+      mPreloadResponseTimingPromise->Resolve(
+          aArgs.preloadResponseTiming().ref(), __func__);
+    }
+
+    mPreloadResponseEndPromise =
+        MakeRefPtr<FetchEventPreloadResponseEndPromise::Private>(__func__);
+    mPreloadResponseEndPromise->UseSynchronousTaskDispatch(__func__);
+    if (aArgs.preloadResponseEndArgs().isSome()) {
+      mPreloadResponseEndPromise->Resolve(aArgs.preloadResponseEndArgs().ref(),
+                                          __func__);
+    }
+  }
+
+  RemoteWorkerChild* manager = static_cast<RemoteWorkerChild*>(Manager());
+  MOZ_ASSERT(manager);
+
+  RefPtr<FetchEventOpProxyChild> self = this;
+
+  auto callback = [self](const ServiceWorkerOpResult& aResult) {
+    // FetchEventOp could finish before NavigationPreload fetch finishes.
+    // If NavigationPreload is available in FetchEvent, caching FetchEventOp
+    // result until RecvPreloadResponseEnd is called, such that the preload
+    // response could be completed.
+    if (self->mPreloadResponseEndPromise &&
+        !self->mPreloadResponseEndPromise->IsResolved() &&
+        self->mPreloadResponseAvailablePromise->IsResolved()) {
+      self->mCachedOpResult = Some(aResult);
+      return;
+    }
+    if (!self->CanSend()) {
+      return;
+    }
+
+    if (NS_WARN_IF(aResult.type() == ServiceWorkerOpResult::Tnsresult)) {
+      Unused << self->Send__delete__(self, aResult.get_nsresult());
+      return;
+    }
+
+    MOZ_ASSERT(aResult.type() ==
+               ServiceWorkerOpResult::TServiceWorkerFetchEventOpResult);
+
+    Unused << self->Send__delete__(self, aResult);
+  };
+
+  RefPtr<FetchEventOp> op = ServiceWorkerOp::Create(aArgs, std::move(callback))
+                                .template downcast<FetchEventOp>();
+
+  MOZ_ASSERT(op);
+
+  op->SetActor(this);
+  mOp = op;
+
+  op->GetRespondWithPromise()
+      ->Then(GetCurrentSerialEventTarget(), __func__,
+             [self = std::move(self)](
+                 FetchEventRespondWithPromise::ResolveOrRejectValue&& aResult) {
+               self->mRespondWithPromiseRequestHolder.Complete();
+
+               if (NS_WARN_IF(aResult.IsReject())) {
+                 MOZ_ASSERT(NS_FAILED(aResult.RejectValue().status()));
+
+                 Unused << self->SendRespondWith(aResult.RejectValue());
+                 return;
+               }
+
+               auto& result = aResult.ResolveValue();
+
+               if (result.is<SynthesizeResponseArgs>()) {
+                 ChildToParentSynthesizeResponseArgs ipcArgs;
+                 nsresult rv = GetIPCSynthesizeResponseArgs(
+                     &ipcArgs, result.extract<SynthesizeResponseArgs>());
+
+                 if (NS_WARN_IF(NS_FAILED(rv))) {
+                   Unused << self->SendRespondWith(
+                       CancelInterceptionArgs(rv, ipcArgs.timeStamps()));
+                   return;
+                 }
+
+                 Unused << self->SendRespondWith(ipcArgs);
+               } else if (result.is<ResetInterceptionArgs>()) {
+                 Unused << self->SendRespondWith(
+                     result.extract<ResetInterceptionArgs>());
+               } else {
+                 Unused << self->SendRespondWith(
+                     result.extract<CancelInterceptionArgs>());
+               }
+             })
+      ->Track(mRespondWithPromiseRequestHolder);
+
+  manager->MaybeStartOp(std::move(op));
+}
+
+SafeRefPtr<InternalRequest> FetchEventOpProxyChild::ExtractInternalRequest() {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(mInternalRequest);
+
+  return std::move(mInternalRequest);
+}
+
+RefPtr<FetchEventPreloadResponseAvailablePromise>
+FetchEventOpProxyChild::GetPreloadResponseAvailablePromise() {
+  return mPreloadResponseAvailablePromise;
+}
+
+RefPtr<FetchEventPreloadResponseTimingPromise>
+FetchEventOpProxyChild::GetPreloadResponseTimingPromise() {
+  return mPreloadResponseTimingPromise;
+}
+
+RefPtr<FetchEventPreloadResponseEndPromise>
+FetchEventOpProxyChild::GetPreloadResponseEndPromise() {
+  return mPreloadResponseEndPromise;
+}
+
+mozilla::ipc::IPCResult FetchEventOpProxyChild::RecvPreloadResponse(
+    ParentToChildInternalResponse&& aResponse) {
+  // Receiving this message implies that navigation preload is enabled, so
+  // Initialize() should have created this promise.
+  MOZ_ASSERT(mPreloadResponseAvailablePromise);
+
+  mPreloadResponseAvailablePromise->Resolve(
+      InternalResponse::FromIPC(aResponse), __func__);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpProxyChild::RecvPreloadResponseTiming(
+    ResponseTiming&& aTiming) {
+  // Receiving this message implies that navigation preload is enabled, so
+  // Initialize() should have created this promise.
+  MOZ_ASSERT(mPreloadResponseTimingPromise);
+
+  mPreloadResponseTimingPromise->Resolve(std::move(aTiming), __func__);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpProxyChild::RecvPreloadResponseEnd(
+    ResponseEndArgs&& aArgs) {
+  // Receiving this message implies that navigation preload is enabled, so
+  // Initialize() should have created this promise.
+  MOZ_ASSERT(mPreloadResponseEndPromise);
+
+  mPreloadResponseEndPromise->Resolve(std::move(aArgs), __func__);
+  // If mCachedOpResult is not nothing, it means FetchEventOp had already done
+  // and the operation result is cached. Continue closing IPC here.
+  if (mCachedOpResult.isNothing()) {
+    return IPC_OK();
+  }
+
+  if (!CanSend()) {
+    return IPC_OK();
+  }
+
+  if (NS_WARN_IF(mCachedOpResult.ref().type() ==
+                 ServiceWorkerOpResult::Tnsresult)) {
+    Unused << Send__delete__(this, mCachedOpResult.ref().get_nsresult());
+    return IPC_OK();
+  }
+
+  MOZ_ASSERT(mCachedOpResult.ref().type() ==
+             ServiceWorkerOpResult::TServiceWorkerFetchEventOpResult);
+
+  Unused << Send__delete__(this, mCachedOpResult.ref());
+
+  return IPC_OK();
+}
+
+void FetchEventOpProxyChild::ActorDestroy(ActorDestroyReason) {
+  Unused << NS_WARN_IF(mRespondWithPromiseRequestHolder.Exists());
+  mRespondWithPromiseRequestHolder.DisconnectIfExists();
+
+  // If mPreloadResponseAvailablePromise exists, navigation preloading response
+  // will not be valid anymore since it is too late to respond to the
+  // FetchEvent. Resolve the preload response promise with
+  // NS_ERROR_DOM_ABORT_ERR.
+  if (mPreloadResponseAvailablePromise) {
+    mPreloadResponseAvailablePromise->Resolve(
+        InternalResponse::NetworkError(NS_ERROR_DOM_ABORT_ERR), __func__);
+  }
+
+  if (mPreloadResponseTimingPromise) {
+    mPreloadResponseTimingPromise->Resolve(ResponseTiming(), __func__);
+  }
+
+  if (mPreloadResponseEndPromise) {
+    ResponseEndArgs args(FetchDriverObserver::eAborted);
+    mPreloadResponseEndPromise->Resolve(args, __func__);
+  }
+
+  mOp->RevokeActor(this);
+  mOp = nullptr;
+}
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/FetchEventOpProxyChild.h b/dom/serviceworkers/FetchEventOpProxyChild.h
new file mode 100644
index 0000000000..e5bd205602
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpProxyChild.h
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_fetcheventopproxychild_h__
+#define mozilla_dom_fetcheventopproxychild_h__
+
+#include "nsISupportsImpl.h"
+
+#include "ServiceWorkerOp.h"
+#include "ServiceWorkerOpPromise.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/InternalRequest.h"
+#include "mozilla/dom/PFetchEventOpProxyChild.h"
+
+namespace mozilla::dom {
+
+class InternalRequest;
+class InternalResponse;
+class ParentToChildServiceWorkerFetchEventOpArgs;
+
+class FetchEventOpProxyChild final : public PFetchEventOpProxyChild {
+  friend class PFetchEventOpProxyChild;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FetchEventOpProxyChild, override);
+
+  FetchEventOpProxyChild() = default;
+
+  void Initialize(const ParentToChildServiceWorkerFetchEventOpArgs& aArgs);
+
+  // Must only be called once and on a worker thread.
+  SafeRefPtr<InternalRequest> ExtractInternalRequest();
+
+  RefPtr<FetchEventPreloadResponseAvailablePromise>
+  GetPreloadResponseAvailablePromise();
+
+  RefPtr<FetchEventPreloadResponseTimingPromise>
+  GetPreloadResponseTimingPromise();
+
+  RefPtr<FetchEventPreloadResponseEndPromise> GetPreloadResponseEndPromise();
+
+ private:
+  ~FetchEventOpProxyChild() = default;
+
+  mozilla::ipc::IPCResult RecvPreloadResponse(
+      ParentToChildInternalResponse&& aResponse);
+
+  mozilla::ipc::IPCResult RecvPreloadResponseTiming(ResponseTiming&& aTiming);
+
+  mozilla::ipc::IPCResult RecvPreloadResponseEnd(ResponseEndArgs&& aArgs);
+
+  void ActorDestroy(ActorDestroyReason) override;
+
+  MozPromiseRequestHolder<FetchEventRespondWithPromise>
+      mRespondWithPromiseRequestHolder;
+
+  RefPtr<FetchEventOp> mOp;
+
+  // Initialized on RemoteWorkerService::Thread, read on a worker thread.
+  SafeRefPtr<InternalRequest> mInternalRequest;
+
+  RefPtr<FetchEventPreloadResponseAvailablePromise::Private>
+      mPreloadResponseAvailablePromise;
+  RefPtr<FetchEventPreloadResponseTimingPromise::Private>
+      mPreloadResponseTimingPromise;
+  RefPtr<FetchEventPreloadResponseEndPromise::Private>
+      mPreloadResponseEndPromise;
+
+  Maybe<ServiceWorkerOpResult> mCachedOpResult;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_fetcheventopproxychild_h__
diff --git a/dom/serviceworkers/FetchEventOpProxyParent.cpp b/dom/serviceworkers/FetchEventOpProxyParent.cpp
new file mode 100644
index 0000000000..a8c4488a26
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpProxyParent.cpp
@@ -0,0 +1,229 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FetchEventOpProxyParent.h"
+
+#include <utility>
+
+#include "mozilla/dom/FetchTypes.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+#include "nsCOMPtr.h"
+#include "nsIInputStream.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Try.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/PRemoteWorkerParent.h"
+#include "mozilla/dom/PRemoteWorkerControllerParent.h"
+#include "mozilla/dom/FetchEventOpParent.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/RemoteLazyInputStreamStorage.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+namespace {
+
+nsresult MaybeDeserializeAndWrapForMainThread(
+    const Maybe<ChildToParentStream>& aSource, int64_t aBodyStreamSize,
+    Maybe<ParentToParentStream>& aSink, PBackgroundParent* aManager) {
+  if (aSource.isNothing()) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStream> deserialized =
+      DeserializeIPCStream(aSource->stream());
+
+  aSink = Some(ParentToParentStream());
+  auto& uuid = aSink->uuid();
+
+  MOZ_TRY(nsID::GenerateUUIDInPlace(uuid));
+
+  auto storageOrErr = RemoteLazyInputStreamStorage::Get();
+
+  if (NS_WARN_IF(storageOrErr.isErr())) {
+    return storageOrErr.unwrapErr();
+  }
+
+  auto storage = storageOrErr.unwrap();
+  storage->AddStream(deserialized, uuid);
+  return NS_OK;
+}
+
+ParentToParentInternalResponse ToParentToParent(
+    const ChildToParentInternalResponse& aResponse,
+    NotNull<PBackgroundParent*> aBackgroundParent) {
+  ParentToParentInternalResponse parentToParentResponse(
+      aResponse.metadata(), Nothing(), aResponse.bodySize(), Nothing());
+
+  MOZ_ALWAYS_SUCCEEDS(MaybeDeserializeAndWrapForMainThread(
+      aResponse.body(), aResponse.bodySize(), parentToParentResponse.body(),
+      aBackgroundParent));
+  MOZ_ALWAYS_SUCCEEDS(MaybeDeserializeAndWrapForMainThread(
+      aResponse.alternativeBody(), InternalResponse::UNKNOWN_BODY_SIZE,
+      parentToParentResponse.alternativeBody(), aBackgroundParent));
+
+  return parentToParentResponse;
+}
+
+ParentToParentSynthesizeResponseArgs ToParentToParent(
+    const ChildToParentSynthesizeResponseArgs& aArgs,
+    NotNull<PBackgroundParent*> aBackgroundParent) {
+  return ParentToParentSynthesizeResponseArgs(
+      ToParentToParent(aArgs.internalResponse(), aBackgroundParent),
+      aArgs.closure(), aArgs.timeStamps());
+}
+
+ParentToParentFetchEventRespondWithResult ToParentToParent(
+    const ChildToParentFetchEventRespondWithResult& aResult,
+    NotNull<PBackgroundParent*> aBackgroundParent) {
+  switch (aResult.type()) {
+    case ChildToParentFetchEventRespondWithResult::
+        TChildToParentSynthesizeResponseArgs:
+      return ToParentToParent(aResult.get_ChildToParentSynthesizeResponseArgs(),
+                              aBackgroundParent);
+
+    case ChildToParentFetchEventRespondWithResult::TResetInterceptionArgs:
+      return aResult.get_ResetInterceptionArgs();
+
+    case ChildToParentFetchEventRespondWithResult::TCancelInterceptionArgs:
+      return aResult.get_CancelInterceptionArgs();
+
+    default:
+      MOZ_CRASH("Invalid ParentToParentFetchEventRespondWithResult");
+  }
+}
+
+}  // anonymous namespace
+
+/* static */ void FetchEventOpProxyParent::Create(
+    PRemoteWorkerParent* aManager,
+    RefPtr<ServiceWorkerFetchEventOpPromise::Private>&& aPromise,
+    const ParentToParentServiceWorkerFetchEventOpArgs& aArgs,
+    RefPtr<FetchEventOpParent> aReal, nsCOMPtr<nsIInputStream> aBodyStream) {
+  AssertIsInMainProcess();
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(aManager);
+  MOZ_ASSERT(aReal);
+
+  ParentToChildServiceWorkerFetchEventOpArgs copyArgs(aArgs.common(), Nothing(),
+                                                      Nothing(), Nothing());
+  if (aArgs.preloadResponse().isSome()) {
+    // Convert the preload response to ParentToChildInternalResponse.
+    copyArgs.preloadResponse() = Some(ToParentToChild(
+        aArgs.preloadResponse().ref(), WrapNotNull(aManager->Manager())));
+  }
+
+  if (aArgs.preloadResponseTiming().isSome()) {
+    copyArgs.preloadResponseTiming() = aArgs.preloadResponseTiming();
+  }
+
+  if (aArgs.preloadResponseEndArgs().isSome()) {
+    copyArgs.preloadResponseEndArgs() = aArgs.preloadResponseEndArgs();
+  }
+
+  RefPtr<FetchEventOpProxyParent> actor =
+      new FetchEventOpProxyParent(std::move(aReal), std::move(aPromise));
+
+  // As long as the fetch event was pending, the FetchEventOpParent was
+  // responsible for keeping the preload response, if it already arrived. Once
+  // the fetch event starts it gives up the preload response (if any) and we
+  // need to add it to the arguments. Note that we have to make sure that the
+  // arguments don't contain the preload response already, otherwise we'll end
+  // up overwriting it with a Nothing.
+  auto [preloadResponse, preloadResponseEndArgs] =
+      actor->mReal->OnStart(WrapNotNull(actor));
+  if (copyArgs.preloadResponse().isNothing() && preloadResponse.isSome()) {
+    copyArgs.preloadResponse() = Some(ToParentToChild(
+        preloadResponse.ref(), WrapNotNull(aManager->Manager())));
+  }
+  if (copyArgs.preloadResponseEndArgs().isNothing() &&
+      preloadResponseEndArgs.isSome()) {
+    copyArgs.preloadResponseEndArgs() = preloadResponseEndArgs;
+  }
+
+  IPCInternalRequest& copyRequest = copyArgs.common().internalRequest();
+
+  if (aBodyStream) {
+    copyRequest.body() = Some(ParentToChildStream());
+
+    RefPtr<RemoteLazyInputStream> stream =
+        RemoteLazyInputStream::WrapStream(aBodyStream);
+    MOZ_DIAGNOSTIC_ASSERT(stream);
+
+    copyRequest.body().ref().get_ParentToChildStream() = stream;
+  }
+
+  Unused << aManager->SendPFetchEventOpProxyConstructor(actor, copyArgs);
+}
+
+FetchEventOpProxyParent::~FetchEventOpProxyParent() {
+  AssertIsOnBackgroundThread();
+}
+
+FetchEventOpProxyParent::FetchEventOpProxyParent(
+    RefPtr<FetchEventOpParent>&& aReal,
+    RefPtr<ServiceWorkerFetchEventOpPromise::Private>&& aPromise)
+    : mReal(std::move(aReal)), mLifetimePromise(std::move(aPromise)) {}
+
+mozilla::ipc::IPCResult FetchEventOpProxyParent::RecvAsyncLog(
+    const nsCString& aScriptSpec, const uint32_t& aLineNumber,
+    const uint32_t& aColumnNumber, const nsCString& aMessageName,
+    nsTArray<nsString>&& aParams) {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mReal);
+
+  Unused << mReal->SendAsyncLog(aScriptSpec, aLineNumber, aColumnNumber,
+                                aMessageName, aParams);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpProxyParent::RecvRespondWith(
+    const ChildToParentFetchEventRespondWithResult& aResult) {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mReal);
+
+  auto manager = WrapNotNull(mReal->Manager());
+  auto backgroundParent = WrapNotNull(manager->Manager());
+  Unused << mReal->SendRespondWith(ToParentToParent(aResult, backgroundParent));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpProxyParent::Recv__delete__(
+    const ServiceWorkerFetchEventOpResult& aResult) {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mLifetimePromise);
+  MOZ_ASSERT(mReal);
+  mReal->OnFinish();
+  if (mLifetimePromise) {
+    mLifetimePromise->Resolve(aResult, __func__);
+    mLifetimePromise = nullptr;
+    mReal = nullptr;
+  }
+
+  return IPC_OK();
+}
+
+void FetchEventOpProxyParent::ActorDestroy(ActorDestroyReason) {
+  AssertIsOnBackgroundThread();
+  if (mLifetimePromise) {
+    mLifetimePromise->Reject(NS_ERROR_DOM_ABORT_ERR, __func__);
+    mLifetimePromise = nullptr;
+    mReal = nullptr;
+  }
+}
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/FetchEventOpProxyParent.h b/dom/serviceworkers/FetchEventOpProxyParent.h
new file mode 100644
index 0000000000..e657ebd21a
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpProxyParent.h
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_fetcheventopproxyparent_h__
+#define mozilla_dom_fetcheventopproxyparent_h__
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/PFetchEventOpProxyParent.h"
+#include "mozilla/dom/ServiceWorkerOpPromise.h"
+
+namespace mozilla::dom {
+
+class FetchEventOpParent;
+class PRemoteWorkerParent;
+class ParentToParentServiceWorkerFetchEventOpArgs;
+
+/**
+ * FetchEventOpProxyParent owns a FetchEventOpParent in order to propagate
+ * the respondWith() value by directly calling SendRespondWith on the
+ * FetchEventOpParent, but the call to Send__delete__ is handled via MozPromise.
+ * This is done because this actor may only be created after its managing
+ * PRemoteWorker is created, which is asynchronous and may fail.  We take on
+ * responsibility for the promise once we are created, but we may not be created
+ * if the RemoteWorker is never successfully launched.
+ */
+class FetchEventOpProxyParent final : public PFetchEventOpProxyParent {
+  friend class PFetchEventOpProxyParent;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FetchEventOpProxyParent, override);
+
+  static void Create(
+      PRemoteWorkerParent* aManager,
+      RefPtr<ServiceWorkerFetchEventOpPromise::Private>&& aPromise,
+      const ParentToParentServiceWorkerFetchEventOpArgs& aArgs,
+      RefPtr<FetchEventOpParent> aReal, nsCOMPtr<nsIInputStream> aBodyStream);
+
+ private:
+  FetchEventOpProxyParent(
+      RefPtr<FetchEventOpParent>&& aReal,
+      RefPtr<ServiceWorkerFetchEventOpPromise::Private>&& aPromise);
+
+  ~FetchEventOpProxyParent();
+
+  mozilla::ipc::IPCResult RecvAsyncLog(const nsCString& aScriptSpec,
+                                       const uint32_t& aLineNumber,
+                                       const uint32_t& aColumnNumber,
+                                       const nsCString& aMessageName,
+                                       nsTArray<nsString>&& aParams);
+
+  mozilla::ipc::IPCResult RecvRespondWith(
+      const ChildToParentFetchEventRespondWithResult& aResult);
+
+  mozilla::ipc::IPCResult Recv__delete__(
+      const ServiceWorkerFetchEventOpResult& aResult);
+
+  void ActorDestroy(ActorDestroyReason) override;
+
+  RefPtr<FetchEventOpParent> mReal;
+  RefPtr<ServiceWorkerFetchEventOpPromise::Private> mLifetimePromise;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_fetcheventopproxyparent_h__
diff --git a/dom/serviceworkers/IPCNavigationPreloadState.ipdlh b/dom/serviceworkers/IPCNavigationPreloadState.ipdlh
new file mode 100644
index 0000000000..2ee4f02789
--- /dev/null
+++ b/dom/serviceworkers/IPCNavigationPreloadState.ipdlh
@@ -0,0 +1,16 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace mozilla {
+namespace dom {
+
+struct IPCNavigationPreloadState {
+  bool enabled;
+  nsCString headerValue;
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/IPCServiceWorkerDescriptor.ipdlh b/dom/serviceworkers/IPCServiceWorkerDescriptor.ipdlh
new file mode 100644
index 0000000000..d074eaaebb
--- /dev/null
+++ b/dom/serviceworkers/IPCServiceWorkerDescriptor.ipdlh
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include PBackgroundSharedTypes;
+
+include "mozilla/dom/ServiceWorkerIPCUtils.h";
+
+using mozilla::dom::ServiceWorkerState from "mozilla/dom/ServiceWorkerBinding.h";
+
+namespace mozilla {
+namespace dom {
+
+// IPC type with enough information to create a ServiceWorker DOM object
+// in a child process.  Note that the state may be slightly out-of-sync
+// with the parent and should be updated dynamically if necessary.
+[Comparable] struct IPCServiceWorkerDescriptor
+{
+  uint64_t id;
+  uint64_t registrationId;
+  uint64_t registrationVersion;
+  PrincipalInfo principalInfo;
+  nsCString scope;
+  nsCString scriptURL;
+  ServiceWorkerState state;
+  bool handlesFetch;
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/IPCServiceWorkerRegistrationDescriptor.ipdlh b/dom/serviceworkers/IPCServiceWorkerRegistrationDescriptor.ipdlh
new file mode 100644
index 0000000000..5619ba55de
--- /dev/null
+++ b/dom/serviceworkers/IPCServiceWorkerRegistrationDescriptor.ipdlh
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include PBackgroundSharedTypes;
+include IPCServiceWorkerDescriptor;
+
+include "ipc/ErrorIPCUtils.h";
+include "mozilla/dom/ServiceWorkerIPCUtils.h";
+
+using mozilla::dom::ServiceWorkerUpdateViaCache from "mozilla/dom/ServiceWorkerRegistrationBinding.h";
+using mozilla::CopyableErrorResult from "mozilla/ErrorResult.h";
+
+namespace mozilla {
+namespace dom {
+
+// IPC type with enough information to create a ServiceWorker DOM object
+// in a child process.  Note that the state may be slightly out-of-sync
+// with the parent and should be updated dynamically if necessary.
+[Comparable] struct IPCServiceWorkerRegistrationDescriptor
+{
+  uint64_t id;
+  uint64_t version;
+
+  // These values should match the principal and scope in each
+  // associated worker.  It may be possible to optimize in the future,
+  // but for now we duplicate the information here to ensure correctness.
+  // Its possible we may need to reference a registration before the
+  // worker is installed yet, etc.
+  PrincipalInfo principalInfo;
+  nsCString scope;
+
+  ServiceWorkerUpdateViaCache updateViaCache;
+
+  IPCServiceWorkerDescriptor? installing;
+  IPCServiceWorkerDescriptor? waiting;
+  IPCServiceWorkerDescriptor? active;
+};
+
+union IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult
+{
+  IPCServiceWorkerRegistrationDescriptor;
+  CopyableErrorResult;
+};
+
+struct IPCServiceWorkerRegistrationDescriptorList
+{
+  IPCServiceWorkerRegistrationDescriptor[] values;
+};
+
+union IPCServiceWorkerRegistrationDescriptorListOrCopyableErrorResult
+{
+  IPCServiceWorkerRegistrationDescriptorList;
+  CopyableErrorResult;
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/NavigationPreloadManager.cpp b/dom/serviceworkers/NavigationPreloadManager.cpp
new file mode 100644
index 0000000000..93c17353ab
--- /dev/null
+++ b/dom/serviceworkers/NavigationPreloadManager.cpp
@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "NavigationPreloadManager.h"
+#include "ServiceWorkerUtils.h"
+#include "nsNetUtil.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/dom/NavigationPreloadManagerBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/ServiceWorker.h"
+#include "mozilla/ipc/MessageChannel.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(NavigationPreloadManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(NavigationPreloadManager)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(NavigationPreloadManager)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(NavigationPreloadManager,
+                                      mServiceWorkerRegistration)
+
+/* static */
+bool NavigationPreloadManager::IsValidHeader(const nsACString& aHeader) {
+  return NS_IsReasonableHTTPHeaderValue(aHeader);
+}
+
+bool NavigationPreloadManager::IsEnabled(JSContext* aCx, JSObject* aGlobal) {
+  return StaticPrefs::dom_serviceWorkers_navigationPreload_enabled() &&
+         ServiceWorkerVisible(aCx, aGlobal);
+}
+
+NavigationPreloadManager::NavigationPreloadManager(
+    RefPtr<ServiceWorkerRegistration>& aServiceWorkerRegistration)
+    : mServiceWorkerRegistration(aServiceWorkerRegistration) {}
+
+JSObject* NavigationPreloadManager::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return NavigationPreloadManager_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<Promise> NavigationPreloadManager::SetEnabled(
+    bool aEnabled, ErrorResult& aError) {
+  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);
+
+  if (NS_WARN_IF(aError.Failed())) {
+    return nullptr;
+  }
+
+  if (!mServiceWorkerRegistration) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return promise.forget();
+  }
+
+  mServiceWorkerRegistration->SetNavigationPreloadEnabled(
+      aEnabled,
+      [promise](bool aSuccess) {
+        if (aSuccess) {
+          promise->MaybeResolveWithUndefined();
+          return;
+        }
+        promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      },
+      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });
+
+  return promise.forget();
+}
+
+already_AddRefed<Promise> NavigationPreloadManager::Enable(
+    ErrorResult& aError) {
+  return SetEnabled(true, aError);
+}
+
+already_AddRefed<Promise> NavigationPreloadManager::Disable(
+    ErrorResult& aError) {
+  return SetEnabled(false, aError);
+}
+
+already_AddRefed<Promise> NavigationPreloadManager::SetHeaderValue(
+    const nsACString& aHeader, ErrorResult& aError) {
+  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);
+
+  if (NS_WARN_IF(aError.Failed())) {
+    return nullptr;
+  }
+
+  if (!IsValidHeader(aHeader)) {
+    promise->MaybeRejectWithTypeError<MSG_INVALID_HEADER_VALUE>(aHeader);
+    return promise.forget();
+  }
+
+  if (!mServiceWorkerRegistration) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return promise.forget();
+  }
+
+  mServiceWorkerRegistration->SetNavigationPreloadHeader(
+      nsAutoCString(aHeader),
+      [promise](bool aSuccess) {
+        if (aSuccess) {
+          promise->MaybeResolveWithUndefined();
+          return;
+        }
+        promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      },
+      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });
+
+  return promise.forget();
+}
+
+already_AddRefed<Promise> NavigationPreloadManager::GetState(
+    ErrorResult& aError) {
+  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);
+
+  if (NS_WARN_IF(aError.Failed())) {
+    return nullptr;
+  }
+
+  if (!mServiceWorkerRegistration) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return promise.forget();
+  }
+
+  mServiceWorkerRegistration->GetNavigationPreloadState(
+      [promise](NavigationPreloadState&& aState) {
+        promise->MaybeResolve(std::move(aState));
+      },
+      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });
+
+  return promise.forget();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/NavigationPreloadManager.h b/dom/serviceworkers/NavigationPreloadManager.h
new file mode 100644
index 0000000000..7b4d0ac50b
--- /dev/null
+++ b/dom/serviceworkers/NavigationPreloadManager.h
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_NavigationPreloadManager_h
+#define mozilla_dom_NavigationPreloadManager_h
+
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupports.h"
+#include "nsWrapperCache.h"
+#include "mozilla/dom/ServiceWorkerRegistration.h"
+#include "mozilla/RefPtr.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+class Promise;
+
+class NavigationPreloadManager final : public nsISupports,
+                                       public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(NavigationPreloadManager)
+
+  static bool IsValidHeader(const nsACString& aHeader);
+
+  static bool IsEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  explicit NavigationPreloadManager(
+      RefPtr<ServiceWorkerRegistration>& aServiceWorkerRegistration);
+
+  // Webidl binding
+  nsIGlobalObject* GetParentObject() const {
+    return mServiceWorkerRegistration->GetParentObject();
+  }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  // WebIdl implementation
+  already_AddRefed<Promise> Enable(ErrorResult& aError);
+
+  already_AddRefed<Promise> Disable(ErrorResult& aError);
+
+  already_AddRefed<Promise> SetHeaderValue(const nsACString& aHeader,
+                                           ErrorResult& aError);
+
+  already_AddRefed<Promise> GetState(ErrorResult& aError);
+
+ private:
+  ~NavigationPreloadManager() = default;
+
+  // General method for Enable()/Disable()
+  already_AddRefed<Promise> SetEnabled(bool aEnabled, ErrorResult& aError);
+
+  RefPtr<ServiceWorkerRegistration> mServiceWorkerRegistration;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_NavigationPreloadManager_h
diff --git a/dom/serviceworkers/PFetchEventOp.ipdl b/dom/serviceworkers/PFetchEventOp.ipdl
new file mode 100644
index 0000000000..75138d43d4
--- /dev/null
+++ b/dom/serviceworkers/PFetchEventOp.ipdl
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PRemoteWorkerController;
+
+include ServiceWorkerOpArgs;
+include FetchTypes;
+
+namespace mozilla {
+namespace dom {
+
+[ManualDealloc]
+protocol PFetchEventOp {
+  manager PRemoteWorkerController;
+
+ parent:
+  async PreloadResponse(ParentToParentInternalResponse aResponse);
+
+  async PreloadResponseTiming(ResponseTiming aTiming);
+
+  async PreloadResponseEnd(ResponseEndArgs aArgs);
+
+ child:
+  async AsyncLog(nsCString aScriptSpec, uint32_t aLineNumber,
+                 uint32_t aColumnNumber, nsCString aMessageName,
+                 nsString[] aParams);
+
+  async RespondWith(ParentToParentFetchEventRespondWithResult aResult);
+
+  async __delete__(ServiceWorkerFetchEventOpResult aResult);
+};
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/PFetchEventOpProxy.ipdl b/dom/serviceworkers/PFetchEventOpProxy.ipdl
new file mode 100644
index 0000000000..b63b2253a9
--- /dev/null
+++ b/dom/serviceworkers/PFetchEventOpProxy.ipdl
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PRemoteWorker;
+
+include ServiceWorkerOpArgs;
+include FetchTypes;
+
+namespace mozilla {
+namespace dom {
+
+protocol PFetchEventOpProxy {
+  manager PRemoteWorker;
+
+ parent:
+  async AsyncLog(nsCString aScriptSpec, uint32_t aLineNumber,
+                 uint32_t aColumnNumber, nsCString aMessageName,
+                 nsString[] aParams);
+
+  async RespondWith(ChildToParentFetchEventRespondWithResult aResult);
+
+  async __delete__(ServiceWorkerFetchEventOpResult aResult);
+
+ child:
+  async PreloadResponse(ParentToChildInternalResponse aResponse);
+
+  async PreloadResponseTiming(ResponseTiming aTiming);
+
+  async PreloadResponseEnd(ResponseEndArgs aArgs);
+};
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/PServiceWorker.ipdl b/dom/serviceworkers/PServiceWorker.ipdl
new file mode 100644
index 0000000000..1f8c54481d
--- /dev/null
+++ b/dom/serviceworkers/PServiceWorker.ipdl
@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBackground;
+
+include ClientIPCTypes;
+include DOMTypes;
+
+namespace mozilla {
+namespace dom {
+
+[ChildImpl=virtual, ParentImpl=virtual]
+protocol PServiceWorker
+{
+  manager PBackground;
+
+parent:
+  async Teardown();
+
+  async PostMessage(ClonedOrErrorMessageData aClonedData, ClientInfoAndState aSource);
+
+child:
+  async __delete__();
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/PServiceWorkerContainer.ipdl b/dom/serviceworkers/PServiceWorkerContainer.ipdl
new file mode 100644
index 0000000000..b24b494631
--- /dev/null
+++ b/dom/serviceworkers/PServiceWorkerContainer.ipdl
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBackground;
+
+include ClientIPCTypes;
+include IPCServiceWorkerRegistrationDescriptor;
+
+include "mozilla/dom/ServiceWorkerIPCUtils.h";
+
+namespace mozilla {
+namespace dom {
+
+[ChildImpl=virtual, ParentImpl=virtual]
+protocol PServiceWorkerContainer
+{
+  manager PBackground;
+
+parent:
+  async Teardown();
+
+  async Register(IPCClientInfo aClientInfo, nsCString aScopeURL, nsCString aScriptURL,
+                 ServiceWorkerUpdateViaCache aUpdateViaCache)
+        returns (IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult aResult);
+
+  async GetRegistration(IPCClientInfo aClientInfo, nsCString aURL)
+        returns (IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult aResult);
+
+  async GetRegistrations(IPCClientInfo aClientInfo)
+        returns (IPCServiceWorkerRegistrationDescriptorListOrCopyableErrorResult aResult);
+
+  async GetReady(IPCClientInfo aClientInfo)
+        returns (IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult aResult);
+
+child:
+  async __delete__();
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/PServiceWorkerManager.ipdl b/dom/serviceworkers/PServiceWorkerManager.ipdl
new file mode 100644
index 0000000000..a41e64e348
--- /dev/null
+++ b/dom/serviceworkers/PServiceWorkerManager.ipdl
@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBackground;
+
+include PBackgroundSharedTypes;
+include ServiceWorkerRegistrarTypes;
+
+using mozilla::OriginAttributes from "mozilla/ipc/BackgroundUtils.h";
+
+namespace mozilla {
+namespace dom {
+
+[ManualDealloc]
+protocol PServiceWorkerManager
+{
+  manager PBackground;
+
+parent:
+  async Register(ServiceWorkerRegistrationData data);
+
+  async Unregister(PrincipalInfo principalInfo, nsString scope);
+
+  async PropagateUnregister(PrincipalInfo principalInfo, nsString scope);
+
+  async __delete__();
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/PServiceWorkerRegistration.ipdl b/dom/serviceworkers/PServiceWorkerRegistration.ipdl
new file mode 100644
index 0000000000..45efc2f52d
--- /dev/null
+++ b/dom/serviceworkers/PServiceWorkerRegistration.ipdl
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBackground;
+
+include IPCNavigationPreloadState;
+include IPCServiceWorkerRegistrationDescriptor;
+
+include "ipc/ErrorIPCUtils.h";
+
+namespace mozilla {
+namespace dom {
+
+[ChildImpl=virtual, ParentImpl=virtual]
+protocol PServiceWorkerRegistration
+{
+  manager PBackground;
+
+parent:
+  async Teardown();
+
+  async Unregister() returns (bool aSuccess, CopyableErrorResult aRv);
+  async Update(nsCString aNewestWorkerScriptUrl) returns (
+    IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult aResult);
+
+  // For NavigationPreload interface
+  async SetNavigationPreloadEnabled(bool aEnabled) returns (bool aSuccess);
+  async SetNavigationPreloadHeader(nsCString aHeader) returns (bool aSuccess);
+  async GetNavigationPreloadState() returns (IPCNavigationPreloadState? aState);
+
+child:
+  async __delete__();
+
+  async UpdateState(IPCServiceWorkerRegistrationDescriptor aDescriptor);
+  async FireUpdateFound();
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/ServiceWorker.cpp b/dom/serviceworkers/ServiceWorker.cpp
new file mode 100644
index 0000000000..c554124fac
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorker.cpp
@@ -0,0 +1,313 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorker.h"
+
+#include "mozilla/dom/Document.h"
+#include "nsGlobalWindowInner.h"
+#include "nsPIDOMWindow.h"
+#include "ServiceWorkerChild.h"
+#include "ServiceWorkerCloneData.h"
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerPrivate.h"
+#include "ServiceWorkerRegistration.h"
+#include "ServiceWorkerUtils.h"
+
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/ClientState.h"
+#include "mozilla/dom/MessagePortBinding.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/ServiceWorkerGlobalScopeBinding.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StorageAccess.h"
+
+#ifdef XP_WIN
+#  undef PostMessage
+#endif
+
+using mozilla::ipc::BackgroundChild;
+using mozilla::ipc::PBackgroundChild;
+
+namespace mozilla::dom {
+
+// static
+already_AddRefed<ServiceWorker> ServiceWorker::Create(
+    nsIGlobalObject* aOwner, const ServiceWorkerDescriptor& aDescriptor) {
+  RefPtr<ServiceWorker> ref = new ServiceWorker(aOwner, aDescriptor);
+  return ref.forget();
+}
+
+ServiceWorker::ServiceWorker(nsIGlobalObject* aGlobal,
+                             const ServiceWorkerDescriptor& aDescriptor)
+    : DOMEventTargetHelper(aGlobal),
+      mDescriptor(aDescriptor),
+      mShutdown(false),
+      mLastNotifiedState(ServiceWorkerState::Installing) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aGlobal);
+
+  PBackgroundChild* parentActor =
+      BackgroundChild::GetOrCreateForCurrentThread();
+  if (NS_WARN_IF(!parentActor)) {
+    Shutdown();
+    return;
+  }
+
+  RefPtr<ServiceWorkerChild> actor = ServiceWorkerChild::Create();
+  if (NS_WARN_IF(!actor)) {
+    Shutdown();
+    return;
+  }
+
+  PServiceWorkerChild* sentActor =
+      parentActor->SendPServiceWorkerConstructor(actor, aDescriptor.ToIPC());
+  if (NS_WARN_IF(!sentActor)) {
+    Shutdown();
+    return;
+  }
+  MOZ_DIAGNOSTIC_ASSERT(sentActor == actor);
+
+  mActor = std::move(actor);
+  mActor->SetOwner(this);
+
+  KeepAliveIfHasListenersFor(nsGkAtoms::onstatechange);
+
+  // The error event handler is required by the spec currently, but is not used
+  // anywhere.  Don't keep the object alive in that case.
+
+  // Attempt to get an existing binding object for the registration
+  // associated with this ServiceWorker.
+  RefPtr<ServiceWorkerRegistration> reg =
+      aGlobal->GetServiceWorkerRegistration(ServiceWorkerRegistrationDescriptor(
+          mDescriptor.RegistrationId(), mDescriptor.RegistrationVersion(),
+          mDescriptor.PrincipalInfo(), mDescriptor.Scope(),
+          ServiceWorkerUpdateViaCache::Imports));
+
+  if (reg) {
+    MaybeAttachToRegistration(reg);
+    // Following codes are commented since GetRegistration has no
+    // implementation. If we can not get an existing binding object, probably
+    // need to create one to associate to it.
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1769652
+    /*
+    } else {
+
+      RefPtr<ServiceWorker> self = this;
+      GetRegistration(
+          [self = std::move(self)](
+              const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+            nsIGlobalObject* global = self->GetParentObject();
+            NS_ENSURE_TRUE_VOID(global);
+            RefPtr<ServiceWorkerRegistration> reg =
+                global->GetOrCreateServiceWorkerRegistration(aDescriptor);
+            self->MaybeAttachToRegistration(reg);
+          },
+          [](ErrorResult&& aRv) {
+            // do nothing
+            aRv.SuppressException();
+          });
+    */
+  }
+}
+
+ServiceWorker::~ServiceWorker() {
+  MOZ_ASSERT(NS_IsMainThread());
+  Shutdown();
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ServiceWorker, DOMEventTargetHelper,
+                                   mRegistration);
+
+NS_IMPL_ADDREF_INHERITED(ServiceWorker, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(ServiceWorker, DOMEventTargetHelper)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServiceWorker)
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(ServiceWorker)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+JSObject* ServiceWorker::WrapObject(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return ServiceWorker_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+ServiceWorkerState ServiceWorker::State() const { return mDescriptor.State(); }
+
+void ServiceWorker::SetState(ServiceWorkerState aState) {
+  NS_ENSURE_TRUE_VOID(aState >= mDescriptor.State());
+  mDescriptor.SetState(aState);
+}
+
+void ServiceWorker::MaybeDispatchStateChangeEvent() {
+  if (mDescriptor.State() <= mLastNotifiedState || !GetParentObject()) {
+    return;
+  }
+  mLastNotifiedState = mDescriptor.State();
+
+  DOMEventTargetHelper::DispatchTrustedEvent(u"statechange"_ns);
+
+  // Once we have transitioned to the redundant state then no
+  // more statechange events will occur.  We can allow the DOM
+  // object to GC if script is not holding it alive.
+  if (mLastNotifiedState == ServiceWorkerState::Redundant) {
+    IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onstatechange);
+  }
+}
+
+void ServiceWorker::GetScriptURL(nsString& aURL) const {
+  CopyUTF8toUTF16(mDescriptor.ScriptURL(), aURL);
+}
+
+void ServiceWorker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                                const Sequence<JSObject*>& aTransferable,
+                                ErrorResult& aRv) {
+  // Step 6.1 of
+  // https://w3c.github.io/ServiceWorker/#service-worker-postmessage-options
+  // invokes
+  // https://w3c.github.io/ServiceWorker/#run-service-worker
+  // which returns failure in step 3 if the ServiceWorker state is redundant.
+  // This will result in the "in parallel" step 6.1 of postMessage itself early
+  // returning without starting the ServiceWorker and without throwing an error.
+  if (State() == ServiceWorkerState::Redundant) {
+    return;
+  }
+
+  nsPIDOMWindowInner* window = GetOwner();
+  if (NS_WARN_IF(!window || !window->GetExtantDoc())) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  auto storageAllowed = StorageAllowedForWindow(window);
+  if (storageAllowed != StorageAccess::eAllow &&
+      (!StaticPrefs::privacy_partition_serviceWorkers() ||
+       !StoragePartitioningEnabled(
+           storageAllowed, window->GetExtantDoc()->CookieJarSettings()))) {
+    ServiceWorkerManager::LocalizeAndReportToAllClients(
+        mDescriptor.Scope(), "ServiceWorkerPostMessageStorageError",
+        nsTArray<nsString>{NS_ConvertUTF8toUTF16(mDescriptor.Scope())});
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  Maybe<ClientInfo> clientInfo = window->GetClientInfo();
+  Maybe<ClientState> clientState = window->GetClientState();
+  if (NS_WARN_IF(clientInfo.isNothing() || clientState.isNothing())) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
+  aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
+                                                          &transferable);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  // Window-to-SW messages do not allow memory sharing since they are not in the
+  // same agent cluster group, but we do not want to throw an error during the
+  // serialization. Because of this, ServiceWorkerCloneData will propagate an
+  // error message data if the SameProcess serialization is required. So that
+  // the receiver (service worker) knows that it needs to throw while
+  // deserialization and sharing memory objects are not propagated to the other
+  // process.
+  JS::CloneDataPolicy clonePolicy;
+  if (nsGlobalWindowInner::Cast(window)->IsSharedMemoryAllowed()) {
+    clonePolicy.allowSharedMemoryObjects();
+  }
+
+  RefPtr<ServiceWorkerCloneData> data = new ServiceWorkerCloneData();
+  data->Write(aCx, aMessage, transferable, clonePolicy, aRv);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  // The value of CloneScope() is set while StructuredCloneData::Write(). If the
+  // aValue contiains a shared memory object, then the scope will be restricted
+  // and thus return SameProcess. If not, it will return DifferentProcess.
+  //
+  // When we postMessage a shared memory object from a window to a service
+  // worker, the object must be sent from a cross-origin isolated process to
+  // another one. So, we mark mark this data as an error message data if the
+  // scope is limited to same process.
+  if (data->CloneScope() ==
+      StructuredCloneHolder::StructuredCloneScope::SameProcess) {
+    data->SetAsErrorMessageData();
+  }
+
+  if (!mActor) {
+    return;
+  }
+
+  ClonedOrErrorMessageData clonedData;
+  if (!data->BuildClonedMessageData(clonedData)) {
+    return;
+  }
+
+  mActor->SendPostMessage(
+      clonedData,
+      ClientInfoAndState(clientInfo.ref().ToIPC(), clientState.ref().ToIPC()));
+}
+
+void ServiceWorker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                                const StructuredSerializeOptions& aOptions,
+                                ErrorResult& aRv) {
+  PostMessage(aCx, aMessage, aOptions.mTransfer, aRv);
+}
+
+const ServiceWorkerDescriptor& ServiceWorker::Descriptor() const {
+  return mDescriptor;
+}
+
+void ServiceWorker::DisconnectFromOwner() {
+  DOMEventTargetHelper::DisconnectFromOwner();
+}
+
+void ServiceWorker::RevokeActor(ServiceWorkerChild* aActor) {
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor->RevokeOwner(this);
+  mActor = nullptr;
+
+  mShutdown = true;
+}
+
+void ServiceWorker::MaybeAttachToRegistration(
+    ServiceWorkerRegistration* aRegistration) {
+  MOZ_DIAGNOSTIC_ASSERT(aRegistration);
+  MOZ_DIAGNOSTIC_ASSERT(!mRegistration);
+
+  // If the registration no longer actually references this ServiceWorker
+  // then we must be in the redundant state.
+  if (!aRegistration->Descriptor().HasWorker(mDescriptor)) {
+    SetState(ServiceWorkerState::Redundant);
+    MaybeDispatchStateChangeEvent();
+    return;
+  }
+
+  mRegistration = aRegistration;
+}
+
+void ServiceWorker::Shutdown() {
+  if (mShutdown) {
+    return;
+  }
+  mShutdown = true;
+
+  if (mActor) {
+    mActor->RevokeOwner(this);
+    mActor->MaybeStartTeardown();
+    mActor = nullptr;
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorker.h b/dom/serviceworkers/ServiceWorker.h
new file mode 100644
index 0000000000..f12cbb0e8b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorker.h
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworker_h__
+#define mozilla_dom_serviceworker_h__
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/ServiceWorkerDescriptor.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+
+#ifdef XP_WIN
+#  undef PostMessage
+#endif
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+class ServiceWorkerChild;
+class ServiceWorkerCloneData;
+struct StructuredSerializeOptions;
+
+#define NS_DOM_SERVICEWORKER_IID                     \
+  {                                                  \
+    0xd42e0611, 0x3647, 0x4319, {                    \
+      0xae, 0x05, 0x19, 0x89, 0x59, 0xba, 0x99, 0x5e \
+    }                                                \
+  }
+
+class ServiceWorker final : public DOMEventTargetHelper {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOM_SERVICEWORKER_IID)
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ServiceWorker, DOMEventTargetHelper)
+
+  IMPL_EVENT_HANDLER(statechange)
+  IMPL_EVENT_HANDLER(error)
+
+  static already_AddRefed<ServiceWorker> Create(
+      nsIGlobalObject* aOwner, const ServiceWorkerDescriptor& aDescriptor);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  ServiceWorkerState State() const;
+
+  void SetState(ServiceWorkerState aState);
+
+  void MaybeDispatchStateChangeEvent();
+
+  void GetScriptURL(nsString& aURL) const;
+
+  void PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                   const Sequence<JSObject*>& aTransferable, ErrorResult& aRv);
+
+  void PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                   const StructuredSerializeOptions& aOptions,
+                   ErrorResult& aRv);
+
+  const ServiceWorkerDescriptor& Descriptor() const;
+
+  void DisconnectFromOwner() override;
+
+  void RevokeActor(ServiceWorkerChild* aActor);
+
+ private:
+  ServiceWorker(nsIGlobalObject* aWindow,
+                const ServiceWorkerDescriptor& aDescriptor);
+
+  // This class is reference-counted and will be destroyed from Release().
+  ~ServiceWorker();
+
+  void MaybeAttachToRegistration(ServiceWorkerRegistration* aRegistration);
+
+  void Shutdown();
+
+  ServiceWorkerDescriptor mDescriptor;
+
+  RefPtr<ServiceWorkerChild> mActor;
+  bool mShutdown;
+
+  RefPtr<ServiceWorkerRegistration> mRegistration;
+  ServiceWorkerState mLastNotifiedState;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(ServiceWorker, NS_DOM_SERVICEWORKER_IID)
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworker_h__
diff --git a/dom/serviceworkers/ServiceWorkerActors.cpp b/dom/serviceworkers/ServiceWorkerActors.cpp
new file mode 100644
index 0000000000..145698f3ad
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerActors.cpp
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerActors.h"
+
+#include "ServiceWorkerChild.h"
+#include "ServiceWorkerContainerChild.h"
+#include "ServiceWorkerContainerParent.h"
+#include "ServiceWorkerParent.h"
+#include "ServiceWorkerRegistrationChild.h"
+#include "ServiceWorkerRegistrationParent.h"
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+void InitServiceWorkerParent(PServiceWorkerParent* aActor,
+                             const IPCServiceWorkerDescriptor& aDescriptor) {
+  auto actor = static_cast<ServiceWorkerParent*>(aActor);
+  actor->Init(aDescriptor);
+}
+
+void InitServiceWorkerContainerParent(PServiceWorkerContainerParent* aActor) {
+  auto actor = static_cast<ServiceWorkerContainerParent*>(aActor);
+  actor->Init();
+}
+
+void InitServiceWorkerRegistrationParent(
+    PServiceWorkerRegistrationParent* aActor,
+    const IPCServiceWorkerRegistrationDescriptor& aDescriptor) {
+  auto actor = static_cast<ServiceWorkerRegistrationParent*>(aActor);
+  actor->Init(aDescriptor);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerActors.h b/dom/serviceworkers/ServiceWorkerActors.h
new file mode 100644
index 0000000000..cad7cf38e7
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerActors.h
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkeractors_h__
+#define mozilla_dom_serviceworkeractors_h__
+
+namespace mozilla::dom {
+
+// PServiceWorker
+
+class IPCServiceWorkerDescriptor;
+class PServiceWorkerParent;
+
+void InitServiceWorkerParent(PServiceWorkerParent* aActor,
+                             const IPCServiceWorkerDescriptor& aDescriptor);
+
+// PServiceWorkerContainer
+
+class PServiceWorkerContainerParent;
+
+void InitServiceWorkerContainerParent(PServiceWorkerContainerParent* aActor);
+
+// PServiceWorkerRegistration
+
+class IPCServiceWorkerRegistrationDescriptor;
+class PServiceWorkerRegistrationParent;
+
+void InitServiceWorkerRegistrationParent(
+    PServiceWorkerRegistrationParent* aActor,
+    const IPCServiceWorkerRegistrationDescriptor& aDescriptor);
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkeractors_h__
diff --git a/dom/serviceworkers/ServiceWorkerChild.cpp b/dom/serviceworkers/ServiceWorkerChild.cpp
new file mode 100644
index 0000000000..9c1b045e9f
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerChild.cpp
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerChild.h"
+#include "ServiceWorker.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+void ServiceWorkerChild::ActorDestroy(ActorDestroyReason aReason) {
+  mIPCWorkerRef = nullptr;
+
+  if (mOwner) {
+    mOwner->RevokeActor(this);
+    MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  }
+}
+
+// static
+RefPtr<ServiceWorkerChild> ServiceWorkerChild::Create() {
+  RefPtr<ServiceWorkerChild> actor = new ServiceWorkerChild();
+
+  if (!NS_IsMainThread()) {
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+
+    RefPtr<IPCWorkerRefHelper<ServiceWorkerChild>> helper =
+        new IPCWorkerRefHelper<ServiceWorkerChild>(actor);
+
+    actor->mIPCWorkerRef = IPCWorkerRef::Create(
+        workerPrivate, "ServiceWorkerChild",
+        [helper] { helper->Actor()->MaybeStartTeardown(); });
+
+    if (NS_WARN_IF(!actor->mIPCWorkerRef)) {
+      return nullptr;
+    }
+  }
+
+  return actor;
+}
+
+ServiceWorkerChild::ServiceWorkerChild()
+    : mOwner(nullptr), mTeardownStarted(false) {}
+
+void ServiceWorkerChild::SetOwner(ServiceWorker* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner);
+  mOwner = aOwner;
+}
+
+void ServiceWorkerChild::RevokeOwner(ServiceWorker* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner == mOwner);
+  mOwner = nullptr;
+}
+
+void ServiceWorkerChild::MaybeStartTeardown() {
+  if (mTeardownStarted) {
+    return;
+  }
+  mTeardownStarted = true;
+  Unused << SendTeardown();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerChild.h b/dom/serviceworkers/ServiceWorkerChild.h
new file mode 100644
index 0000000000..2352c1d0a5
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerChild.h
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerchild_h__
+#define mozilla_dom_serviceworkerchild_h__
+
+#include "mozilla/dom/PServiceWorkerChild.h"
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+class IPCWorkerRef;
+class ServiceWorker;
+
+class ServiceWorkerChild final : public PServiceWorkerChild {
+  RefPtr<IPCWorkerRef> mIPCWorkerRef;
+  ServiceWorker* mOwner;
+  bool mTeardownStarted;
+
+  ServiceWorkerChild();
+
+  ~ServiceWorkerChild() = default;
+
+  // PServiceWorkerChild
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerChild, override);
+
+  static RefPtr<ServiceWorkerChild> Create();
+
+  void SetOwner(ServiceWorker* aOwner);
+
+  void RevokeOwner(ServiceWorker* aOwner);
+
+  void MaybeStartTeardown();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerchild_h__
diff --git a/dom/serviceworkers/ServiceWorkerCloneData.cpp b/dom/serviceworkers/ServiceWorkerCloneData.cpp
new file mode 100644
index 0000000000..b74d45386a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerCloneData.cpp
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerCloneData.h"
+
+#include <utility>
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "nsISerialEventTarget.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::dom {
+
+ServiceWorkerCloneData::~ServiceWorkerCloneData() {
+  RefPtr<ipc::SharedJSAllocatedData> sharedData = TakeSharedData();
+  if (sharedData) {
+    NS_ProxyRelease(__func__, mEventTarget, sharedData.forget());
+  }
+}
+
+ServiceWorkerCloneData::ServiceWorkerCloneData()
+    : ipc::StructuredCloneData(
+          StructuredCloneHolder::StructuredCloneScope::UnknownDestination,
+          StructuredCloneHolder::TransferringSupported),
+      mEventTarget(GetCurrentSerialEventTarget()),
+      mIsErrorMessageData(false) {
+  MOZ_DIAGNOSTIC_ASSERT(mEventTarget);
+}
+
+bool ServiceWorkerCloneData::BuildClonedMessageData(
+    ClonedOrErrorMessageData& aClonedData) {
+  if (IsErrorMessageData()) {
+    aClonedData = ErrorMessageData();
+    return true;
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(
+      CloneScope() ==
+      StructuredCloneHolder::StructuredCloneScope::DifferentProcess);
+
+  ClonedMessageData messageData;
+  if (!StructuredCloneData::BuildClonedMessageData(messageData)) {
+    return false;
+  }
+
+  aClonedData = std::move(messageData);
+
+  return true;
+}
+
+void ServiceWorkerCloneData::CopyFromClonedMessageData(
+    const ClonedOrErrorMessageData& aClonedData) {
+  if (aClonedData.type() == ClonedOrErrorMessageData::TErrorMessageData) {
+    mIsErrorMessageData = true;
+    return;
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(aClonedData.type() ==
+                        ClonedOrErrorMessageData::TClonedMessageData);
+
+  StructuredCloneData::CopyFromClonedMessageData(aClonedData);
+}
+
+void ServiceWorkerCloneData::SetAsErrorMessageData() {
+  MOZ_ASSERT(CloneScope() ==
+             StructuredCloneHolder::StructuredCloneScope::SameProcess);
+
+  mIsErrorMessageData = true;
+}
+
+bool ServiceWorkerCloneData::IsErrorMessageData() const {
+  return mIsErrorMessageData;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerCloneData.h b/dom/serviceworkers/ServiceWorkerCloneData.h
new file mode 100644
index 0000000000..b29b43414b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerCloneData.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerCloneData_h__
+#define mozilla_dom_ServiceWorkerCloneData_h__
+
+#include "mozilla/Assertions.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+
+class nsISerialEventTarget;
+
+namespace mozilla {
+namespace ipc {
+class PBackgroundChild;
+class PBackgroundParent;
+}  // namespace ipc
+
+namespace dom {
+
+class ClonedOrErrorMessageData;
+
+// Helper class used to pack structured clone data so that it can be
+// passed across thread and process boundaries.  Currently the raw
+// StructuredCloneData and StructureCloneHolder APIs both make it
+// difficult to meet this needs directly.  This helper class improves
+// the situation by:
+//
+//  1. Provides a ref-counted version of StructuredCloneData.  We need
+//     StructuredCloneData so we can serialize/deserialize across IPC.
+//     The move constructor problems in StructuredCloneData (bug 1462676),
+//     though, makes it hard to pass it around.  Passing a ref-counted
+//     pointer addresses this problem.
+//  2. Normally StructuredCloneData runs into problems if you try to move
+//     it across thread boundaries because it releases its SharedJSAllocatedData
+//     on the wrong thread.  This helper will correctly proxy release the
+//     shared data on the correct thread.
+//
+// This helper class should really just be used to serialize on one thread
+// and then move the reference across thread/process boundries to the
+// target worker thread.  This class is not intended to support simultaneous
+// read/write operations from different threads at the same time.
+class ServiceWorkerCloneData final : public ipc::StructuredCloneData {
+  nsCOMPtr<nsISerialEventTarget> mEventTarget;
+  bool mIsErrorMessageData;
+
+  ~ServiceWorkerCloneData();
+
+ public:
+  ServiceWorkerCloneData();
+
+  bool BuildClonedMessageData(ClonedOrErrorMessageData& aClonedData);
+
+  void CopyFromClonedMessageData(const ClonedOrErrorMessageData& aClonedData);
+
+  void SetAsErrorMessageData();
+
+  bool IsErrorMessageData() const;
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerCloneData)
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ServiceWorkerCloneData_h__
diff --git a/dom/serviceworkers/ServiceWorkerContainer.cpp b/dom/serviceworkers/ServiceWorkerContainer.cpp
new file mode 100644
index 0000000000..1a7b5bbed6
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainer.cpp
@@ -0,0 +1,888 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerContainer.h"
+
+#include "nsContentPolicyUtils.h"
+#include "nsContentSecurityManager.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/Document.h"
+#include "nsIServiceWorkerManager.h"
+#include "nsIScriptError.h"
+#include "nsThreadUtils.h"
+#include "nsNetUtil.h"
+#include "nsPIDOMWindow.h"
+#include "mozilla/Components.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsServiceManagerUtils.h"
+#include "mozilla/LoadInfo.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticPrefs_extensions.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/StorageAccess.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/DOMMozPromiseRequestHolder.h"
+#include "mozilla/dom/MessageEvent.h"
+#include "mozilla/dom/MessageEventBinding.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/ServiceWorker.h"
+#include "mozilla/dom/ServiceWorkerContainerBinding.h"
+#include "mozilla/dom/ServiceWorkerContainerChild.h"
+#include "mozilla/dom/ServiceWorkerManager.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+
+#include "ServiceWorker.h"
+#include "ServiceWorkerRegistration.h"
+#include "ServiceWorkerUtils.h"
+
+// This is defined to something else on Windows
+#ifdef DispatchMessage
+#  undef DispatchMessage
+#endif
+
+namespace mozilla::dom {
+
+using mozilla::ipc::BackgroundChild;
+using mozilla::ipc::PBackgroundChild;
+using mozilla::ipc::ResponseRejectReason;
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServiceWorkerContainer)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(ServiceWorkerContainer, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(ServiceWorkerContainer, DOMEventTargetHelper)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ServiceWorkerContainer, DOMEventTargetHelper,
+                                   mControllerWorker, mReadyPromise)
+
+// static
+already_AddRefed<ServiceWorkerContainer> ServiceWorkerContainer::Create(
+    nsIGlobalObject* aGlobal) {
+  RefPtr<ServiceWorkerContainer> ref = new ServiceWorkerContainer(aGlobal);
+  return ref.forget();
+}
+
+ServiceWorkerContainer::ServiceWorkerContainer(nsIGlobalObject* aGlobal)
+    : DOMEventTargetHelper(aGlobal), mShutdown(false) {
+  PBackgroundChild* parentActor =
+      BackgroundChild::GetOrCreateForCurrentThread();
+  if (NS_WARN_IF(!parentActor)) {
+    Shutdown();
+    return;
+  }
+
+  RefPtr<ServiceWorkerContainerChild> actor =
+      ServiceWorkerContainerChild::Create();
+  if (NS_WARN_IF(!actor)) {
+    Shutdown();
+    return;
+  }
+
+  PServiceWorkerContainerChild* sentActor =
+      parentActor->SendPServiceWorkerContainerConstructor(actor);
+  if (NS_WARN_IF(!sentActor)) {
+    Shutdown();
+    return;
+  }
+  MOZ_DIAGNOSTIC_ASSERT(sentActor == actor);
+
+  mActor = std::move(actor);
+  mActor->SetOwner(this);
+
+  Maybe<ServiceWorkerDescriptor> controller = aGlobal->GetController();
+  if (controller.isSome()) {
+    mControllerWorker = aGlobal->GetOrCreateServiceWorker(controller.ref());
+  }
+}
+
+ServiceWorkerContainer::~ServiceWorkerContainer() { Shutdown(); }
+
+void ServiceWorkerContainer::DisconnectFromOwner() {
+  mControllerWorker = nullptr;
+  mReadyPromise = nullptr;
+  DOMEventTargetHelper::DisconnectFromOwner();
+}
+
+void ServiceWorkerContainer::ControllerChanged(ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> go = GetParentObject();
+  if (!go) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+  mControllerWorker = go->GetOrCreateServiceWorker(go->GetController().ref());
+  aRv = DispatchTrustedEvent(u"controllerchange"_ns);
+}
+
+using mozilla::dom::ipc::StructuredCloneData;
+
+// A ReceivedMessage represents a message sent via
+// Client.postMessage(). It is used as used both for queuing of
+// incoming messages and as an interface to DispatchMessage().
+struct MOZ_HEAP_CLASS ServiceWorkerContainer::ReceivedMessage {
+  explicit ReceivedMessage(const ClientPostMessageArgs& aArgs)
+      : mServiceWorker(aArgs.serviceWorker()) {
+    mClonedData.CopyFromClonedMessageData(aArgs.clonedData());
+  }
+
+  ServiceWorkerDescriptor mServiceWorker;
+  StructuredCloneData mClonedData;
+
+  NS_INLINE_DECL_REFCOUNTING(ReceivedMessage)
+
+ private:
+  ~ReceivedMessage() = default;
+};
+
+void ServiceWorkerContainer::ReceiveMessage(
+    const ClientPostMessageArgs& aArgs) {
+  RefPtr<ReceivedMessage> message = new ReceivedMessage(aArgs);
+  if (mMessagesStarted) {
+    EnqueueReceivedMessageDispatch(std::move(message));
+  } else {
+    mPendingMessages.AppendElement(message.forget());
+  }
+}
+
+void ServiceWorkerContainer::RevokeActor(ServiceWorkerContainerChild* aActor) {
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor->RevokeOwner(this);
+  mActor = nullptr;
+
+  mShutdown = true;
+}
+
+JSObject* ServiceWorkerContainer::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return ServiceWorkerContainer_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+namespace {
+
+already_AddRefed<nsIURI> GetBaseURIFromGlobal(nsIGlobalObject* aGlobal,
+                                              ErrorResult& aRv) {
+  // It would be nice not to require a window here, but right
+  // now we don't have a great way to get the base URL just
+  // from the nsIGlobalObject.
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal);
+  if (!window) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  Document* doc = window->GetExtantDoc();
+  if (!doc) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> baseURI = doc->GetDocBaseURI();
+  if (!baseURI) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  return baseURI.forget();
+}
+
+}  // anonymous namespace
+
+already_AddRefed<Promise> ServiceWorkerContainer::Register(
+    const nsAString& aScriptURL, const RegistrationOptions& aOptions,
+    const CallerType aCallerType, ErrorResult& aRv) {
+  // Note, we can't use GetGlobalIfValid() from the start here.  If we
+  // hit a storage failure we want to log a message with the final
+  // scope string we put together below.
+  nsIGlobalObject* global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  Maybe<ClientInfo> clientInfo = global->GetClientInfo();
+  if (clientInfo.isNothing()) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> baseURI = GetBaseURIFromGlobal(global, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Don't use NS_ConvertUTF16toUTF8 because that doesn't let us handle OOM.
+  nsAutoCString scriptURL;
+  if (!AppendUTF16toUTF8(aScriptURL, scriptURL, fallible)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> scriptURI;
+  nsresult rv =
+      NS_NewURI(getter_AddRefs(scriptURI), scriptURL, nullptr, baseURI);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(scriptURL);
+    return nullptr;
+  }
+
+  // Never allow script URL with moz-extension scheme if support is fully
+  // disabled by the 'extensions.background_service_worker.enabled' pref.
+  if (scriptURI->SchemeIs("moz-extension") &&
+      !StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup()) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  // In ServiceWorkerContainer.register() the scope argument is parsed against
+  // different base URLs depending on whether it was passed or not.
+  nsCOMPtr<nsIURI> scopeURI;
+
+  // Step 4. If none passed, parse against script's URL
+  if (!aOptions.mScope.WasPassed()) {
+    constexpr auto defaultScope = "./"_ns;
+    rv = NS_NewURI(getter_AddRefs(scopeURI), defaultScope, nullptr, scriptURI);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      nsAutoCString spec;
+      scriptURI->GetSpec(spec);
+      aRv.ThrowTypeError<MSG_INVALID_SCOPE>(defaultScope, spec);
+      return nullptr;
+    }
+  } else {
+    // Step 5. Parse against entry settings object's base URL.
+    rv = NS_NewURI(getter_AddRefs(scopeURI), aOptions.mScope.Value(), nullptr,
+                   baseURI);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      nsIURI* uri = baseURI ? baseURI : scriptURI;
+      nsAutoCString spec;
+      uri->GetSpec(spec);
+      aRv.ThrowTypeError<MSG_INVALID_SCOPE>(
+          NS_ConvertUTF16toUTF8(aOptions.mScope.Value()), spec);
+      return nullptr;
+    }
+  }
+
+  // Strip the any ref from both the script and scope URLs.
+  nsCOMPtr<nsIURI> cloneWithoutRef;
+  aRv = NS_GetURIWithoutRef(scriptURI, getter_AddRefs(cloneWithoutRef));
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+  scriptURI = std::move(cloneWithoutRef);
+
+  aRv = NS_GetURIWithoutRef(scopeURI, getter_AddRefs(cloneWithoutRef));
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+  scopeURI = std::move(cloneWithoutRef);
+
+  ServiceWorkerScopeAndScriptAreValid(clientInfo.ref(), scopeURI, scriptURI,
+                                      aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global);
+  if (!window) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  Document* doc = window->GetExtantDoc();
+  if (!doc) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  // The next section of code executes an NS_CheckContentLoadPolicy()
+  // check.  This is necessary to enforce the CSP of the calling client.
+  // Currently this requires an Document.  Once bug 965637 lands we
+  // should try to move this into ServiceWorkerScopeAndScriptAreValid()
+  // using the ClientInfo instead of doing a window-specific check here.
+  // See bug 1455077 for further investigation.
+  nsCOMPtr<nsILoadInfo> secCheckLoadInfo = new mozilla::net::LoadInfo(
+      doc->NodePrincipal(),  // loading principal
+      doc->NodePrincipal(),  // triggering principal
+      doc,                   // loading node
+      nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK,
+      nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER);
+
+  // Check content policy.
+  int16_t decision = nsIContentPolicy::ACCEPT;
+  rv = NS_CheckContentLoadPolicy(scriptURI, secCheckLoadInfo, &decision);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+  if (NS_WARN_IF(decision != nsIContentPolicy::ACCEPT)) {
+    aRv.Throw(NS_ERROR_CONTENT_BLOCKED);
+    return nullptr;
+  }
+
+  // Get the string representation for both the script and scope since
+  // we sanitized them above.
+  nsCString cleanedScopeURL;
+  aRv = scopeURI->GetSpec(cleanedScopeURL);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  nsCString cleanedScriptURL;
+  aRv = scriptURI->GetSpec(cleanedScriptURL);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Verify that the global is valid and has permission to store
+  // data.  We perform this late so that we can report the final
+  // scope URL in any error message.
+  Unused << GetGlobalIfValid(aRv, [&](Document* aDoc) {
+    AutoTArray<nsString, 1> param;
+    CopyUTF8toUTF16(cleanedScopeURL, *param.AppendElement());
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                    "Service Workers"_ns, aDoc,
+                                    nsContentUtils::eDOM_PROPERTIES,
+                                    "ServiceWorkerRegisterStorageError", param);
+  });
+
+  window->NoteCalledRegisterForServiceWorkerScope(cleanedScopeURL);
+
+  RefPtr<Promise> outer =
+      Promise::Create(global, aRv, Promise::ePropagateUserInteraction);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<ServiceWorkerContainer> self = this;
+
+  if (!mActor) {
+    aRv.ThrowInvalidStateError("Can't register service worker");
+    return nullptr;
+  }
+
+  mActor->SendRegister(
+      clientInfo.ref().ToIPC(), nsCString(cleanedScopeURL),
+      nsCString(cleanedScriptURL), aOptions.mUpdateViaCache,
+      [self,
+       outer](const IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult&
+                  aResult) {
+        if (aResult.type() ==
+            IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult::
+                TCopyableErrorResult) {
+          // application layer error
+          CopyableErrorResult rv = aResult.get_CopyableErrorResult();
+          MOZ_DIAGNOSTIC_ASSERT(rv.Failed());
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        // success
+        const auto& ipcDesc =
+            aResult.get_IPCServiceWorkerRegistrationDescriptor();
+        ErrorResult rv;
+        nsIGlobalObject* global = self->GetGlobalIfValid(rv);
+        if (rv.Failed()) {
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        RefPtr<ServiceWorkerRegistration> reg =
+            global->GetOrCreateServiceWorkerRegistration(
+                ServiceWorkerRegistrationDescriptor(ipcDesc));
+        outer->MaybeResolve(reg);
+      },
+      [outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        CopyableErrorResult rv;
+        rv.ThrowInvalidStateError("Failed to register service worker");
+        outer->MaybeReject(std::move(rv));
+      });
+
+  return outer.forget();
+}
+
+already_AddRefed<ServiceWorker> ServiceWorkerContainer::GetController() {
+  RefPtr<ServiceWorker> ref = mControllerWorker;
+  return ref.forget();
+}
+
+already_AddRefed<Promise> ServiceWorkerContainer::GetRegistrations(
+    ErrorResult& aRv) {
+  nsIGlobalObject* global = GetGlobalIfValid(aRv, [](Document* aDoc) {
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                    "Service Workers"_ns, aDoc,
+                                    nsContentUtils::eDOM_PROPERTIES,
+                                    "ServiceWorkerGetRegistrationStorageError");
+  });
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  Maybe<ClientInfo> clientInfo = global->GetClientInfo();
+  if (clientInfo.isNothing()) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  RefPtr<Promise> outer =
+      Promise::Create(global, aRv, Promise::ePropagateUserInteraction);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<ServiceWorkerContainer> self = this;
+
+  if (!mActor) {
+    outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return outer.forget();
+  }
+
+  mActor->SendGetRegistrations(
+      clientInfo.ref().ToIPC(),
+      [self, outer](
+          const IPCServiceWorkerRegistrationDescriptorListOrCopyableErrorResult&
+              aResult) {
+        if (aResult.type() ==
+            IPCServiceWorkerRegistrationDescriptorListOrCopyableErrorResult::
+                TCopyableErrorResult) {
+          // application layer error
+          const auto& rv = aResult.get_CopyableErrorResult();
+          MOZ_DIAGNOSTIC_ASSERT(rv.Failed());
+          outer->MaybeReject(CopyableErrorResult(rv));
+          return;
+        }
+        // success
+        const auto& ipcList =
+            aResult.get_IPCServiceWorkerRegistrationDescriptorList();
+        nsTArray<ServiceWorkerRegistrationDescriptor> list(
+            ipcList.values().Length());
+        for (const auto& ipcDesc : ipcList.values()) {
+          list.AppendElement(ServiceWorkerRegistrationDescriptor(ipcDesc));
+        }
+
+        ErrorResult rv;
+        nsIGlobalObject* global = self->GetGlobalIfValid(rv);
+        if (rv.Failed()) {
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        nsTArray<RefPtr<ServiceWorkerRegistration>> regList;
+        for (auto& desc : list) {
+          RefPtr<ServiceWorkerRegistration> reg =
+              global->GetOrCreateServiceWorkerRegistration(desc);
+          if (reg) {
+            regList.AppendElement(std::move(reg));
+          }
+        }
+        outer->MaybeResolve(regList);
+      },
+      [outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      });
+
+  return outer.forget();
+}
+
+void ServiceWorkerContainer::StartMessages() {
+  while (!mPendingMessages.IsEmpty()) {
+    EnqueueReceivedMessageDispatch(mPendingMessages.ElementAt(0));
+    mPendingMessages.RemoveElementAt(0);
+  }
+  mMessagesStarted = true;
+}
+
+already_AddRefed<Promise> ServiceWorkerContainer::GetRegistration(
+    const nsAString& aURL, ErrorResult& aRv) {
+  nsIGlobalObject* global = GetGlobalIfValid(aRv, [](Document* aDoc) {
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                    "Service Workers"_ns, aDoc,
+                                    nsContentUtils::eDOM_PROPERTIES,
+                                    "ServiceWorkerGetRegistrationStorageError");
+  });
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  Maybe<ClientInfo> clientInfo = global->GetClientInfo();
+  if (clientInfo.isNothing()) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> baseURI = GetBaseURIFromGlobal(global, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  aRv = NS_NewURI(getter_AddRefs(uri), aURL, nullptr, baseURI);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  nsCString spec;
+  aRv = uri->GetSpec(spec);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<Promise> outer =
+      Promise::Create(global, aRv, Promise::ePropagateUserInteraction);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<ServiceWorkerContainer> self = this;
+
+  if (!mActor) {
+    outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return outer.forget();
+  }
+
+  mActor->SendGetRegistration(
+      clientInfo.ref().ToIPC(), spec,
+      [self,
+       outer](const IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult&
+                  aResult) {
+        if (aResult.type() ==
+            IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult::
+                TCopyableErrorResult) {
+          CopyableErrorResult ipcRv(aResult.get_CopyableErrorResult());
+          ErrorResult rv(std::move(ipcRv));
+          if (!rv.Failed()) {
+            // ErrorResult rv;
+            //  If rv is a failure then this is an application layer error.
+            //  Note, though, we also reject with NS_OK to indicate that we just
+            //  didn't find a registration.
+            Unused << self->GetGlobalIfValid(rv);
+            if (!rv.Failed()) {
+              outer->MaybeResolveWithUndefined();
+              return;
+            }
+          }
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        // success
+        const auto& ipcDesc =
+            aResult.get_IPCServiceWorkerRegistrationDescriptor();
+        ErrorResult rv;
+        nsIGlobalObject* global = self->GetGlobalIfValid(rv);
+        if (rv.Failed()) {
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        RefPtr<ServiceWorkerRegistration> reg =
+            global->GetOrCreateServiceWorkerRegistration(
+                ServiceWorkerRegistrationDescriptor(ipcDesc));
+        outer->MaybeResolve(reg);
+      },
+      [self, outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      });
+  return outer.forget();
+}
+
+Promise* ServiceWorkerContainer::GetReady(ErrorResult& aRv) {
+  if (mReadyPromise) {
+    return mReadyPromise;
+  }
+
+  nsIGlobalObject* global = GetGlobalIfValid(aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+  MOZ_DIAGNOSTIC_ASSERT(global);
+
+  Maybe<ClientInfo> clientInfo(global->GetClientInfo());
+  if (clientInfo.isNothing()) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  mReadyPromise =
+      Promise::Create(global, aRv, Promise::ePropagateUserInteraction);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<ServiceWorkerContainer> self = this;
+  RefPtr<Promise> outer = mReadyPromise;
+
+  if (!mActor) {
+    mReadyPromise->MaybeReject(
+        CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return mReadyPromise;
+  }
+
+  mActor->SendGetReady(
+      clientInfo.ref().ToIPC(),
+      [self,
+       outer](const IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult&
+                  aResult) {
+        if (aResult.type() ==
+            IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult::
+                TCopyableErrorResult) {
+          // application layer error
+          CopyableErrorResult rv(aResult.get_CopyableErrorResult());
+          MOZ_DIAGNOSTIC_ASSERT(rv.Failed());
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        // success
+        const auto& ipcDesc =
+            aResult.get_IPCServiceWorkerRegistrationDescriptor();
+        ErrorResult rv;
+        nsIGlobalObject* global = self->GetGlobalIfValid(rv);
+        if (rv.Failed()) {
+          outer->MaybeReject(std::move(rv));
+          return;
+        }
+        RefPtr<ServiceWorkerRegistration> reg =
+            global->GetOrCreateServiceWorkerRegistration(
+                ServiceWorkerRegistrationDescriptor(ipcDesc));
+        NS_ENSURE_TRUE_VOID(reg);
+
+        // Don't resolve the ready promise until the registration has
+        // reached the right version.  This ensures that the active
+        // worker property is set correctly on the registration.
+        reg->WhenVersionReached(ipcDesc.version(), [outer, reg](bool aResult) {
+          outer->MaybeResolve(reg);
+        });
+      },
+      [outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        outer->MaybeReject(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+      });
+
+  return mReadyPromise;
+}
+
+// Testing only.
+void ServiceWorkerContainer::GetScopeForUrl(const nsAString& aUrl,
+                                            nsString& aScope,
+                                            ErrorResult& aRv) {
+  nsCOMPtr<nsIServiceWorkerManager> swm =
+      mozilla::components::ServiceWorkerManager::Service();
+  if (!swm) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
+  if (NS_WARN_IF(!window)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv = StoragePrincipalHelper::GetPrincipal(
+      window,
+      StaticPrefs::privacy_partition_serviceWorkers()
+          ? StoragePrincipalHelper::eForeignPartitionedPrincipal
+          : StoragePrincipalHelper::eRegularPrincipal,
+      getter_AddRefs(principal));
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.Throw(rv);
+    return;
+  }
+
+  aRv = swm->GetScopeForUrl(principal, aUrl, aScope);
+}
+
+nsIGlobalObject* ServiceWorkerContainer::GetGlobalIfValid(
+    ErrorResult& aRv,
+    const std::function<void(Document*)>&& aStorageFailureCB) const {
+  // For now we require a window since ServiceWorkerContainer is
+  // not exposed on worker globals yet.  The main thing we need
+  // to fix here to support that is the storage access check via
+  // the nsIGlobalObject.
+  nsPIDOMWindowInner* window = GetOwner();
+  if (NS_WARN_IF(!window)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  nsCOMPtr<Document> doc = window->GetExtantDoc();
+  if (NS_WARN_IF(!doc)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  // Don't allow a service worker to access service worker registrations
+  // from a window with storage disabled.  If these windows can access
+  // the registration it increases the chance they can bypass the storage
+  // block via postMessage(), etc.
+  auto storageAllowed = StorageAllowedForWindow(window);
+  if (NS_WARN_IF(storageAllowed != StorageAccess::eAllow &&
+                 (!StaticPrefs::privacy_partition_serviceWorkers() ||
+                  !StoragePartitioningEnabled(storageAllowed,
+                                              doc->CookieJarSettings())))) {
+    if (aStorageFailureCB) {
+      aStorageFailureCB(doc);
+    }
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  // Don't allow service workers when the document is chrome.
+  if (NS_WARN_IF(doc->NodePrincipal()->IsSystemPrincipal())) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  return window->AsGlobal();
+}
+
+void ServiceWorkerContainer::EnqueueReceivedMessageDispatch(
+    RefPtr<ReceivedMessage> aMessage) {
+  NS_DispatchToMainThread(NewRunnableMethod<RefPtr<ReceivedMessage>>(
+      "ServiceWorkerContainer::DispatchMessage", this,
+      &ServiceWorkerContainer::DispatchMessage, std::move(aMessage)));
+}
+
+template <typename F>
+void ServiceWorkerContainer::RunWithJSContext(F&& aCallable) {
+  nsCOMPtr<nsIGlobalObject> globalObject;
+  if (nsPIDOMWindowInner* const window = GetOwner()) {
+    globalObject = do_QueryInterface(window);
+  }
+
+  // If AutoJSAPI::Init() fails then either global is nullptr or not
+  // in a usable state.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(globalObject)) {
+    return;
+  }
+
+  aCallable(jsapi.cx(), globalObject);
+}
+
+void ServiceWorkerContainer::DispatchMessage(RefPtr<ReceivedMessage> aMessage) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // When dispatching a message, either DOMContentLoaded has already
+  // been fired, or someone called startMessages() or set onmessage.
+  // Either way, a global object is supposed to be present. If it's
+  // not, we'd fail to initialize the JS API and exit.
+  RunWithJSContext([this, message = std::move(aMessage)](
+                       JSContext* const aCx, nsIGlobalObject* const aGlobal) {
+    ErrorResult result;
+    bool deserializationFailed = false;
+    RootedDictionary<MessageEventInit> init(aCx);
+    auto res = FillInMessageEventInit(aCx, aGlobal, *message, init, result);
+    if (res.isErr()) {
+      deserializationFailed = res.unwrapErr();
+      MOZ_ASSERT_IF(deserializationFailed, init.mData.isNull());
+      MOZ_ASSERT_IF(deserializationFailed, init.mPorts.IsEmpty());
+      MOZ_ASSERT_IF(deserializationFailed, !init.mOrigin.IsEmpty());
+      MOZ_ASSERT_IF(deserializationFailed, !init.mSource.IsNull());
+      result.SuppressException();
+
+      if (!deserializationFailed && result.MaybeSetPendingException(aCx)) {
+        return;
+      }
+    }
+
+    RefPtr<MessageEvent> event = MessageEvent::Constructor(
+        this, deserializationFailed ? u"messageerror"_ns : u"message"_ns, init);
+    event->SetTrusted(true);
+
+    result = NS_OK;
+    DispatchEvent(*event, result);
+    if (result.Failed()) {
+      result.SuppressException();
+    }
+  });
+}
+
+namespace {
+
+nsresult FillInOriginNoSuffix(const ServiceWorkerDescriptor& aServiceWorker,
+                              nsString& aOrigin) {
+  using mozilla::ipc::PrincipalInfoToPrincipal;
+
+  nsresult rv;
+
+  auto principalOrErr =
+      PrincipalInfoToPrincipal(aServiceWorker.PrincipalInfo());
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return principalOrErr.unwrapErr();
+  }
+
+  nsAutoCString originUTF8;
+  rv = principalOrErr.unwrap()->GetOriginNoSuffix(originUTF8);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  CopyUTF8toUTF16(originUTF8, aOrigin);
+  return NS_OK;
+}
+
+}  // namespace
+
+Result<Ok, bool> ServiceWorkerContainer::FillInMessageEventInit(
+    JSContext* const aCx, nsIGlobalObject* const aGlobal,
+    ReceivedMessage& aMessage, MessageEventInit& aInit, ErrorResult& aRv) {
+  // Determining the source and origin should preceed attempting deserialization
+  // because on a "messageerror" event (i.e. when deserialization fails), the
+  // dispatched message needs to contain such an origin and source, per spec:
+  //
+  // "If this throws an exception, catch it, fire an event named messageerror
+  //  at destination, using MessageEvent, with the origin attribute initialized
+  //  to origin and the source attribute initialized to source, and then abort
+  //  these steps." - 6.4 of postMessage
+  //  See: https://w3c.github.io/ServiceWorker/#service-worker-postmessage
+  const RefPtr<ServiceWorker> serviceWorkerInstance =
+      aGlobal->GetOrCreateServiceWorker(aMessage.mServiceWorker);
+  if (serviceWorkerInstance) {
+    aInit.mSource.SetValue().SetAsServiceWorker() = serviceWorkerInstance;
+  }
+
+  const nsresult rv =
+      FillInOriginNoSuffix(aMessage.mServiceWorker, aInit.mOrigin);
+  if (NS_FAILED(rv)) {
+    return Err(false);
+  }
+
+  JS::Rooted<JS::Value> messageData(aCx);
+  aMessage.mClonedData.Read(aCx, &messageData, aRv);
+  if (aRv.Failed()) {
+    return Err(true);
+  }
+
+  aInit.mData = messageData;
+
+  if (!aMessage.mClonedData.TakeTransferredPortsAsSequence(aInit.mPorts)) {
+    xpc::Throw(aCx, NS_ERROR_OUT_OF_MEMORY);
+    return Err(false);
+  }
+
+  return Ok();
+}
+
+void ServiceWorkerContainer::Shutdown() {
+  if (mShutdown) {
+    return;
+  }
+  mShutdown = true;
+
+  if (mActor) {
+    mActor->RevokeOwner(this);
+    mActor->MaybeStartTeardown();
+    mActor = nullptr;
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerContainer.h b/dom/serviceworkers/ServiceWorkerContainer.h
new file mode 100644
index 0000000000..3a5dd5fa5d
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainer.h
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkercontainer_h__
+#define mozilla_dom_serviceworkercontainer_h__
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+
+class nsIGlobalWindow;
+
+namespace mozilla::dom {
+
+class ClientPostMessageArgs;
+struct MessageEventInit;
+class Promise;
+struct RegistrationOptions;
+class ServiceWorker;
+class ServiceWorkerContainerChild;
+
+// Lightweight serviceWorker APIs collection.
+class ServiceWorkerContainer final : public DOMEventTargetHelper {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ServiceWorkerContainer,
+                                           DOMEventTargetHelper)
+
+  IMPL_EVENT_HANDLER(controllerchange)
+  IMPL_EVENT_HANDLER(messageerror)
+
+  // Almost a manual expansion of IMPL_EVENT_HANDLER(message), but
+  // with the additional StartMessages() when setting the handler, as
+  // required by the spec.
+  inline mozilla::dom::EventHandlerNonNull* GetOnmessage() {
+    return GetEventHandler(nsGkAtoms::onmessage);
+  }
+  inline void SetOnmessage(mozilla::dom::EventHandlerNonNull* aCallback) {
+    SetEventHandler(nsGkAtoms::onmessage, aCallback);
+    StartMessages();
+  }
+
+  static bool IsEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  static already_AddRefed<ServiceWorkerContainer> Create(
+      nsIGlobalObject* aGlobal);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  already_AddRefed<Promise> Register(const nsAString& aScriptURL,
+                                     const RegistrationOptions& aOptions,
+                                     const CallerType aCallerType,
+                                     ErrorResult& aRv);
+
+  already_AddRefed<ServiceWorker> GetController();
+
+  already_AddRefed<Promise> GetRegistration(const nsAString& aDocumentURL,
+                                            ErrorResult& aRv);
+
+  already_AddRefed<Promise> GetRegistrations(ErrorResult& aRv);
+
+  void StartMessages();
+
+  Promise* GetReady(ErrorResult& aRv);
+
+  // Testing only.
+  void GetScopeForUrl(const nsAString& aUrl, nsString& aScope,
+                      ErrorResult& aRv);
+
+  // DOMEventTargetHelper
+  void DisconnectFromOwner() override;
+
+  // Invalidates |mControllerWorker| and dispatches a "controllerchange"
+  // event.
+  void ControllerChanged(ErrorResult& aRv);
+
+  void ReceiveMessage(const ClientPostMessageArgs& aArgs);
+
+  void RevokeActor(ServiceWorkerContainerChild* aActor);
+
+ private:
+  explicit ServiceWorkerContainer(nsIGlobalObject* aGlobal);
+
+  ~ServiceWorkerContainer();
+
+  // Utility method to get the global if its present and if certain
+  // additional validaty checks pass.  One of these additional checks
+  // verifies the global can access storage.  Since storage access can
+  // vary based on user settings we want to often provide some error
+  // message if the storage check fails.  This method takes an optional
+  // callback that can be used to report the storage failure to the
+  // devtools console.
+  nsIGlobalObject* GetGlobalIfValid(
+      ErrorResult& aRv,
+      const std::function<void(Document*)>&& aStorageFailureCB = nullptr) const;
+
+  struct ReceivedMessage;
+
+  // Dispatch a Runnable that dispatches the given message on this
+  // object. When the owner of this object is a Window, the Runnable
+  // is dispatched on the corresponding TabGroup.
+  void EnqueueReceivedMessageDispatch(RefPtr<ReceivedMessage> aMessage);
+
+  template <typename F>
+  void RunWithJSContext(F&& aCallable);
+
+  void DispatchMessage(RefPtr<ReceivedMessage> aMessage);
+
+  // When it fails, returning boolean means whether it's because deserailization
+  // failed or not.
+  static Result<Ok, bool> FillInMessageEventInit(JSContext* aCx,
+                                                 nsIGlobalObject* aGlobal,
+                                                 ReceivedMessage& aMessage,
+                                                 MessageEventInit& aInit,
+                                                 ErrorResult& aRv);
+
+  void Shutdown();
+
+  RefPtr<ServiceWorkerContainerChild> mActor;
+  bool mShutdown;
+
+  // This only changes when a worker hijacks everything in its scope by calling
+  // claim.
+  RefPtr<ServiceWorker> mControllerWorker;
+
+  RefPtr<Promise> mReadyPromise;
+  MozPromiseRequestHolder<ServiceWorkerRegistrationPromise> mReadyPromiseHolder;
+
+  // Set after StartMessages() has been called.
+  bool mMessagesStarted = false;
+
+  // Queue holding messages posted from service worker as long as
+  // StartMessages() hasn't been called.
+  nsTArray<RefPtr<ReceivedMessage>> mPendingMessages;
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_serviceworkercontainer_h__ */
diff --git a/dom/serviceworkers/ServiceWorkerContainerChild.cpp b/dom/serviceworkers/ServiceWorkerContainerChild.cpp
new file mode 100644
index 0000000000..1093bca91a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerChild.cpp
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/PServiceWorkerContainerChild.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/dom/WorkerRef.h"
+
+#include "ServiceWorkerContainer.h"
+#include "ServiceWorkerContainerChild.h"
+
+namespace mozilla::dom {
+
+void ServiceWorkerContainerChild::ActorDestroy(ActorDestroyReason aReason) {
+  mIPCWorkerRef = nullptr;
+
+  if (mOwner) {
+    mOwner->RevokeActor(this);
+    MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  }
+}
+
+// static
+already_AddRefed<ServiceWorkerContainerChild>
+ServiceWorkerContainerChild::Create() {
+  RefPtr actor = new ServiceWorkerContainerChild;
+
+  if (!NS_IsMainThread()) {
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+
+    RefPtr<IPCWorkerRefHelper<ServiceWorkerContainerChild>> helper =
+        new IPCWorkerRefHelper<ServiceWorkerContainerChild>(actor);
+
+    actor->mIPCWorkerRef = IPCWorkerRef::Create(
+        workerPrivate, "ServiceWorkerContainerChild",
+        [helper] { helper->Actor()->MaybeStartTeardown(); });
+    if (NS_WARN_IF(!actor->mIPCWorkerRef)) {
+      return nullptr;
+    }
+  }
+
+  return actor.forget();
+}
+
+ServiceWorkerContainerChild::ServiceWorkerContainerChild()
+    : mOwner(nullptr), mTeardownStarted(false) {}
+
+void ServiceWorkerContainerChild::SetOwner(ServiceWorkerContainer* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner);
+  mOwner = aOwner;
+}
+
+void ServiceWorkerContainerChild::RevokeOwner(ServiceWorkerContainer* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner == mOwner);
+  mOwner = nullptr;
+}
+
+void ServiceWorkerContainerChild::MaybeStartTeardown() {
+  if (mTeardownStarted) {
+    return;
+  }
+  mTeardownStarted = true;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerContainerChild.h b/dom/serviceworkers/ServiceWorkerContainerChild.h
new file mode 100644
index 0000000000..4d9df91f0b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerChild.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkercontainerchild_h__
+#define mozilla_dom_serviceworkercontainerchild_h__
+
+#include "mozilla/dom/PServiceWorkerContainerChild.h"
+
+// XXX Avoid including this here by moving function bodies to the cpp file
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerContainer;
+
+class IPCWorkerRef;
+
+class ServiceWorkerContainerChild final : public PServiceWorkerContainerChild {
+  RefPtr<IPCWorkerRef> mIPCWorkerRef;
+  ServiceWorkerContainer* mOwner;
+  bool mTeardownStarted;
+
+  ServiceWorkerContainerChild();
+
+  ~ServiceWorkerContainerChild() = default;
+
+  // PServiceWorkerContainerChild
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerContainerChild, override);
+
+  static already_AddRefed<ServiceWorkerContainerChild> Create();
+
+  void SetOwner(ServiceWorkerContainer* aOwner);
+
+  void RevokeOwner(ServiceWorkerContainer* aOwner);
+
+  void MaybeStartTeardown();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkercontainerchild_h__
diff --git a/dom/serviceworkers/ServiceWorkerContainerParent.cpp b/dom/serviceworkers/ServiceWorkerContainerParent.cpp
new file mode 100644
index 0000000000..664586d5e8
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerParent.cpp
@@ -0,0 +1,129 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerContainerParent.h"
+
+#include "ServiceWorkerContainerProxy.h"
+#include "mozilla/dom/ClientInfo.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::IPCResult;
+
+void ServiceWorkerContainerParent::ActorDestroy(ActorDestroyReason aReason) {
+  if (mProxy) {
+    mProxy->RevokeActor(this);
+    mProxy = nullptr;
+  }
+}
+
+IPCResult ServiceWorkerContainerParent::RecvTeardown() {
+  Unused << Send__delete__(this);
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerContainerParent::RecvRegister(
+    const IPCClientInfo& aClientInfo, const nsACString& aScopeURL,
+    const nsACString& aScriptURL,
+    const ServiceWorkerUpdateViaCache& aUpdateViaCache,
+    RegisterResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return IPC_OK();
+  }
+
+  mProxy
+      ->Register(ClientInfo(aClientInfo), aScopeURL, aScriptURL,
+                 aUpdateViaCache)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolver](const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+            aResolver(aDescriptor.ToIPC());
+          },
+          [aResolver](const CopyableErrorResult& aResult) {
+            aResolver(aResult);
+          });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerContainerParent::RecvGetRegistration(
+    const IPCClientInfo& aClientInfo, const nsACString& aURL,
+    GetRegistrationResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return IPC_OK();
+  }
+
+  mProxy->GetRegistration(ClientInfo(aClientInfo), aURL)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolver](const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+            aResolver(aDescriptor.ToIPC());
+          },
+          [aResolver](const CopyableErrorResult& aResult) {
+            aResolver(aResult);
+          });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerContainerParent::RecvGetRegistrations(
+    const IPCClientInfo& aClientInfo, GetRegistrationsResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return IPC_OK();
+  }
+
+  mProxy->GetRegistrations(ClientInfo(aClientInfo))
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolver](
+              const nsTArray<ServiceWorkerRegistrationDescriptor>& aList) {
+            IPCServiceWorkerRegistrationDescriptorList ipcList;
+            for (auto& desc : aList) {
+              ipcList.values().AppendElement(desc.ToIPC());
+            }
+            aResolver(std::move(ipcList));
+          },
+          [aResolver](const CopyableErrorResult& aResult) {
+            aResolver(aResult);
+          });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerContainerParent::RecvGetReady(
+    const IPCClientInfo& aClientInfo, GetReadyResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return IPC_OK();
+  }
+
+  mProxy->GetReady(ClientInfo(aClientInfo))
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolver](const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+            aResolver(aDescriptor.ToIPC());
+          },
+          [aResolver](const CopyableErrorResult& aResult) {
+            aResolver(aResult);
+          });
+
+  return IPC_OK();
+}
+
+ServiceWorkerContainerParent::ServiceWorkerContainerParent() = default;
+
+ServiceWorkerContainerParent::~ServiceWorkerContainerParent() {
+  MOZ_DIAGNOSTIC_ASSERT(!mProxy);
+}
+
+void ServiceWorkerContainerParent::Init() {
+  mProxy = new ServiceWorkerContainerProxy(this);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerContainerParent.h b/dom/serviceworkers/ServiceWorkerContainerParent.h
new file mode 100644
index 0000000000..787a026c18
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerParent.h
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkercontainerparent_h__
+#define mozilla_dom_serviceworkercontainerparent_h__
+
+#include "mozilla/dom/PServiceWorkerContainerParent.h"
+
+namespace mozilla::dom {
+
+class IPCServiceWorkerDescriptor;
+class ServiceWorkerContainerProxy;
+
+class ServiceWorkerContainerParent final
+    : public PServiceWorkerContainerParent {
+  RefPtr<ServiceWorkerContainerProxy> mProxy;
+
+  ~ServiceWorkerContainerParent();
+
+  // PServiceWorkerContainerParent
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+  mozilla::ipc::IPCResult RecvTeardown() override;
+
+  mozilla::ipc::IPCResult RecvRegister(
+      const IPCClientInfo& aClientInfo, const nsACString& aScopeURL,
+      const nsACString& aScriptURL,
+      const ServiceWorkerUpdateViaCache& aUpdateViaCache,
+      RegisterResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvGetRegistration(
+      const IPCClientInfo& aClientInfo, const nsACString& aURL,
+      GetRegistrationResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvGetRegistrations(
+      const IPCClientInfo& aClientInfo,
+      GetRegistrationsResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvGetReady(const IPCClientInfo& aClientInfo,
+                                       GetReadyResolver&& aResolver) override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerContainerParent, override);
+
+  ServiceWorkerContainerParent();
+
+  void Init();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkercontainerparent_h__
diff --git a/dom/serviceworkers/ServiceWorkerContainerProxy.cpp b/dom/serviceworkers/ServiceWorkerContainerProxy.cpp
new file mode 100644
index 0000000000..888731acef
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerProxy.cpp
@@ -0,0 +1,149 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerContainerProxy.h"
+
+#include "mozilla/dom/ServiceWorkerContainerParent.h"
+#include "mozilla/dom/ServiceWorkerManager.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/ScopeExit.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::AssertIsOnBackgroundThread;
+
+ServiceWorkerContainerProxy::~ServiceWorkerContainerProxy() {
+  // Any thread
+  MOZ_DIAGNOSTIC_ASSERT(!mActor);
+}
+
+ServiceWorkerContainerProxy::ServiceWorkerContainerProxy(
+    ServiceWorkerContainerParent* aActor)
+    : mActor(aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+
+  // The container does not directly listen for updates, so we don't need
+  // to immediately initialize.  The controllerchange event comes via the
+  // ClientSource associated with the ServiceWorkerContainer's bound global.
+}
+
+void ServiceWorkerContainerProxy::RevokeActor(
+    ServiceWorkerContainerParent* aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor = nullptr;
+}
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerContainerProxy::Register(
+    const ClientInfo& aClientInfo, const nsACString& aScopeURL,
+    const nsACString& aScriptURL, ServiceWorkerUpdateViaCache aUpdateViaCache) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationPromise::Private> promise =
+      new ServiceWorkerRegistrationPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__,
+      [aClientInfo, aScopeURL = nsCString(aScopeURL),
+       aScriptURL = nsCString(aScriptURL), aUpdateViaCache, promise]() mutable {
+        auto scopeExit = MakeScopeExit(
+            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+
+        swm->Register(aClientInfo, aScopeURL, aScriptURL, aUpdateViaCache)
+            ->ChainTo(promise.forget(), __func__);
+
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<ServiceWorkerRegistrationPromise>
+ServiceWorkerContainerProxy::GetRegistration(const ClientInfo& aClientInfo,
+                                             const nsACString& aURL) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationPromise::Private> promise =
+      new ServiceWorkerRegistrationPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__, [aClientInfo, aURL = nsCString(aURL), promise]() mutable {
+        auto scopeExit = MakeScopeExit(
+            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+
+        swm->GetRegistration(aClientInfo, aURL)
+            ->ChainTo(promise.forget(), __func__);
+
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<ServiceWorkerRegistrationListPromise>
+ServiceWorkerContainerProxy::GetRegistrations(const ClientInfo& aClientInfo) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationListPromise::Private> promise =
+      new ServiceWorkerRegistrationListPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableFunction(__func__, [aClientInfo, promise]() mutable {
+        auto scopeExit = MakeScopeExit(
+            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+
+        swm->GetRegistrations(aClientInfo)->ChainTo(promise.forget(), __func__);
+
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerContainerProxy::GetReady(
+    const ClientInfo& aClientInfo) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationPromise::Private> promise =
+      new ServiceWorkerRegistrationPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableFunction(__func__, [aClientInfo, promise]() mutable {
+        auto scopeExit = MakeScopeExit(
+            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+
+        swm->WhenReady(aClientInfo)->ChainTo(promise.forget(), __func__);
+
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerContainerProxy.h b/dom/serviceworkers/ServiceWorkerContainerProxy.h
new file mode 100644
index 0000000000..b380465a3e
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerContainerProxy.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef moz_dom_ServiceWorkerContainerProxy_h
+#define moz_dom_ServiceWorkerContainerProxy_h
+
+#include "mozilla/dom/ServiceWorkerUtils.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerContainerParent;
+
+class ServiceWorkerContainerProxy final {
+  // Background thread only
+  RefPtr<ServiceWorkerContainerParent> mActor;
+
+  ~ServiceWorkerContainerProxy();
+
+ public:
+  explicit ServiceWorkerContainerProxy(ServiceWorkerContainerParent* aActor);
+
+  void RevokeActor(ServiceWorkerContainerParent* aActor);
+
+  RefPtr<ServiceWorkerRegistrationPromise> Register(
+      const ClientInfo& aClientInfo, const nsACString& aScopeURL,
+      const nsACString& aScriptURL,
+      ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  RefPtr<ServiceWorkerRegistrationPromise> GetRegistration(
+      const ClientInfo& aClientInfo, const nsACString& aURL);
+
+  RefPtr<ServiceWorkerRegistrationListPromise> GetRegistrations(
+      const ClientInfo& aClientInfo);
+
+  RefPtr<ServiceWorkerRegistrationPromise> GetReady(
+      const ClientInfo& aClientInfo);
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerContainerProxy);
+};
+
+}  // namespace mozilla::dom
+
+#endif  // moz_dom_ServiceWorkerContainerProxy_h
diff --git a/dom/serviceworkers/ServiceWorkerDescriptor.cpp b/dom/serviceworkers/ServiceWorkerDescriptor.cpp
new file mode 100644
index 0000000000..898f271fea
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerDescriptor.cpp
@@ -0,0 +1,141 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerDescriptor.h"
+#include "mozilla/dom/IPCServiceWorkerDescriptor.h"
+#include "mozilla/dom/ServiceWorkerBinding.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::PrincipalInfo;
+using mozilla::ipc::PrincipalInfoToPrincipal;
+
+ServiceWorkerDescriptor::ServiceWorkerDescriptor(
+    uint64_t aId, uint64_t aRegistrationId, uint64_t aRegistrationVersion,
+    nsIPrincipal* aPrincipal, const nsACString& aScope,
+    const nsACString& aScriptURL, ServiceWorkerState aState)
+    : mData(MakeUnique<IPCServiceWorkerDescriptor>()) {
+  MOZ_ALWAYS_SUCCEEDS(
+      PrincipalToPrincipalInfo(aPrincipal, &mData->principalInfo()));
+
+  mData->id() = aId;
+  mData->registrationId() = aRegistrationId;
+  mData->registrationVersion() = aRegistrationVersion;
+  mData->scope() = aScope;
+  mData->scriptURL() = aScriptURL;
+  mData->state() = aState;
+  // Set HandlesFetch as true in default
+  mData->handlesFetch() = true;
+}
+
+ServiceWorkerDescriptor::ServiceWorkerDescriptor(
+    uint64_t aId, uint64_t aRegistrationId, uint64_t aRegistrationVersion,
+    const mozilla::ipc::PrincipalInfo& aPrincipalInfo, const nsACString& aScope,
+    const nsACString& aScriptURL, ServiceWorkerState aState)
+    : mData(MakeUnique<IPCServiceWorkerDescriptor>(
+          aId, aRegistrationId, aRegistrationVersion, aPrincipalInfo,
+          nsCString(aScriptURL), nsCString(aScope), aState, true)) {}
+
+ServiceWorkerDescriptor::ServiceWorkerDescriptor(
+    const IPCServiceWorkerDescriptor& aDescriptor)
+    : mData(MakeUnique<IPCServiceWorkerDescriptor>(aDescriptor)) {}
+
+ServiceWorkerDescriptor::ServiceWorkerDescriptor(
+    const ServiceWorkerDescriptor& aRight) {
+  operator=(aRight);
+}
+
+ServiceWorkerDescriptor& ServiceWorkerDescriptor::operator=(
+    const ServiceWorkerDescriptor& aRight) {
+  if (this == &aRight) {
+    return *this;
+  }
+  mData.reset();
+  mData = MakeUnique<IPCServiceWorkerDescriptor>(*aRight.mData);
+  return *this;
+}
+
+ServiceWorkerDescriptor::ServiceWorkerDescriptor(
+    ServiceWorkerDescriptor&& aRight)
+    : mData(std::move(aRight.mData)) {}
+
+ServiceWorkerDescriptor& ServiceWorkerDescriptor::operator=(
+    ServiceWorkerDescriptor&& aRight) {
+  mData.reset();
+  mData = std::move(aRight.mData);
+  return *this;
+}
+
+ServiceWorkerDescriptor::~ServiceWorkerDescriptor() = default;
+
+bool ServiceWorkerDescriptor::operator==(
+    const ServiceWorkerDescriptor& aRight) const {
+  return *mData == *aRight.mData;
+}
+
+uint64_t ServiceWorkerDescriptor::Id() const { return mData->id(); }
+
+uint64_t ServiceWorkerDescriptor::RegistrationId() const {
+  return mData->registrationId();
+}
+
+uint64_t ServiceWorkerDescriptor::RegistrationVersion() const {
+  return mData->registrationVersion();
+}
+
+const mozilla::ipc::PrincipalInfo& ServiceWorkerDescriptor::PrincipalInfo()
+    const {
+  return mData->principalInfo();
+}
+
+Result<nsCOMPtr<nsIPrincipal>, nsresult> ServiceWorkerDescriptor::GetPrincipal()
+    const {
+  AssertIsOnMainThread();
+  return PrincipalInfoToPrincipal(mData->principalInfo());
+}
+
+const nsCString& ServiceWorkerDescriptor::Scope() const {
+  return mData->scope();
+}
+
+const nsCString& ServiceWorkerDescriptor::ScriptURL() const {
+  return mData->scriptURL();
+}
+
+ServiceWorkerState ServiceWorkerDescriptor::State() const {
+  return mData->state();
+}
+
+void ServiceWorkerDescriptor::SetState(ServiceWorkerState aState) {
+  mData->state() = aState;
+}
+
+void ServiceWorkerDescriptor::SetRegistrationVersion(uint64_t aVersion) {
+  MOZ_DIAGNOSTIC_ASSERT(aVersion > mData->registrationVersion());
+  mData->registrationVersion() = aVersion;
+}
+
+bool ServiceWorkerDescriptor::HandlesFetch() const {
+  return mData->handlesFetch();
+}
+
+void ServiceWorkerDescriptor::SetHandlesFetch(bool aHandlesFetch) {
+  mData->handlesFetch() = aHandlesFetch;
+}
+
+bool ServiceWorkerDescriptor::Matches(
+    const ServiceWorkerDescriptor& aDescriptor) const {
+  return Id() == aDescriptor.Id() && Scope() == aDescriptor.Scope() &&
+         ScriptURL() == aDescriptor.ScriptURL() &&
+         PrincipalInfo() == aDescriptor.PrincipalInfo();
+}
+
+const IPCServiceWorkerDescriptor& ServiceWorkerDescriptor::ToIPC() const {
+  return *mData;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerDescriptor.h b/dom/serviceworkers/ServiceWorkerDescriptor.h
new file mode 100644
index 0000000000..b85890089b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerDescriptor.h
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _mozilla_dom_ServiceWorkerDescriptor_h
+#define _mozilla_dom_ServiceWorkerDescriptor_h
+
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+
+class nsIPrincipal;
+
+namespace mozilla {
+
+namespace ipc {
+class PrincipalInfo;
+}  // namespace ipc
+
+namespace dom {
+
+class IPCServiceWorkerDescriptor;
+enum class ServiceWorkerState : uint8_t;
+
+// This class represents a snapshot of a particular ServiceWorkerInfo object.
+// It is threadsafe and can be transferred across processes.  This is useful
+// because most of its values are immutable and can be relied upon to be
+// accurate. Currently the only variable field is the ServiceWorkerState.
+class ServiceWorkerDescriptor final {
+  // This class is largely a wrapper around an IPDL generated struct.  We
+  // need the wrapper class since IPDL generated code includes windows.h
+  // which is in turn incompatible with bindings code.
+  UniquePtr<IPCServiceWorkerDescriptor> mData;
+
+ public:
+  ServiceWorkerDescriptor(uint64_t aId, uint64_t aRegistrationId,
+                          uint64_t aRegistrationVersion,
+                          nsIPrincipal* aPrincipal, const nsACString& aScope,
+                          const nsACString& aScriptURL,
+                          ServiceWorkerState aState);
+
+  ServiceWorkerDescriptor(uint64_t aId, uint64_t aRegistrationId,
+                          uint64_t aRegistrationVersion,
+                          const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
+                          const nsACString& aScope,
+                          const nsACString& aScriptURL,
+                          ServiceWorkerState aState);
+
+  explicit ServiceWorkerDescriptor(
+      const IPCServiceWorkerDescriptor& aDescriptor);
+
+  ServiceWorkerDescriptor(const ServiceWorkerDescriptor& aRight);
+
+  ServiceWorkerDescriptor& operator=(const ServiceWorkerDescriptor& aRight);
+
+  ServiceWorkerDescriptor(ServiceWorkerDescriptor&& aRight);
+
+  ServiceWorkerDescriptor& operator=(ServiceWorkerDescriptor&& aRight);
+
+  ~ServiceWorkerDescriptor();
+
+  bool operator==(const ServiceWorkerDescriptor& aRight) const;
+
+  uint64_t Id() const;
+
+  uint64_t RegistrationId() const;
+
+  uint64_t RegistrationVersion() const;
+
+  const mozilla::ipc::PrincipalInfo& PrincipalInfo() const;
+
+  Result<nsCOMPtr<nsIPrincipal>, nsresult> GetPrincipal() const;
+
+  const nsCString& Scope() const;
+
+  const nsCString& ScriptURL() const;
+
+  ServiceWorkerState State() const;
+
+  void SetState(ServiceWorkerState aState);
+
+  void SetRegistrationVersion(uint64_t aVersion);
+
+  bool HandlesFetch() const;
+
+  void SetHandlesFetch(bool aHandlesFetch);
+
+  // Try to determine if two workers match each other.  This is less strict
+  // than an operator==() call since it ignores mutable values like State().
+  bool Matches(const ServiceWorkerDescriptor& aDescriptor) const;
+
+  // Expose the underlying IPC type so that it can be passed via IPC.
+  const IPCServiceWorkerDescriptor& ToIPC() const;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // _mozilla_dom_ServiceWorkerDescriptor_h
diff --git a/dom/serviceworkers/ServiceWorkerEvents.cpp b/dom/serviceworkers/ServiceWorkerEvents.cpp
new file mode 100644
index 0000000000..531e29e905
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerEvents.cpp
@@ -0,0 +1,1262 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerEvents.h"
+
+#include <utility>
+
+#include "ServiceWorker.h"
+#include "ServiceWorkerManager.h"
+#include "js/Conversions.h"
+#include "js/Exception.h"  // JS::ExceptionStack, JS::StealPendingExceptionStack
+#include "js/TypeDecls.h"
+#include "mozilla/Encoding.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/LoadInfo.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/dom/BodyUtil.h"
+#include "mozilla/dom/Client.h"
+#include "mozilla/dom/EventBinding.h"
+#include "mozilla/dom/FetchEventBinding.h"
+#include "mozilla/dom/MessagePort.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "mozilla/dom/PushEventBinding.h"
+#include "mozilla/dom/PushMessageDataBinding.h"
+#include "mozilla/dom/PushUtil.h"
+#include "mozilla/dom/Request.h"
+#include "mozilla/dom/Response.h"
+#include "mozilla/dom/ServiceWorkerOp.h"
+#include "mozilla/dom/TypedArray.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/net/NeckoChannelParams.h"
+#include "mozilla/Telemetry.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentPolicyUtils.h"
+#include "nsContentUtils.h"
+#include "nsIConsoleReportCollector.h"
+#include "nsINetworkInterceptController.h"
+#include "nsIScriptError.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsQueryObject.h"
+#include "nsSerializationHelper.h"
+#include "nsServiceManagerUtils.h"
+#include "nsStreamUtils.h"
+#include "xpcpublic.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+namespace {
+
+void AsyncLog(nsIInterceptedChannel* aInterceptedChannel,
+              const nsACString& aRespondWithScriptSpec,
+              uint32_t aRespondWithLineNumber,
+              uint32_t aRespondWithColumnNumber, const nsACString& aMessageName,
+              const nsTArray<nsString>& aParams) {
+  MOZ_ASSERT(aInterceptedChannel);
+  nsCOMPtr<nsIConsoleReportCollector> reporter =
+      aInterceptedChannel->GetConsoleReportCollector();
+  if (reporter) {
+    reporter->AddConsoleReport(nsIScriptError::errorFlag,
+                               "Service Worker Interception"_ns,
+                               nsContentUtils::eDOM_PROPERTIES,
+                               aRespondWithScriptSpec, aRespondWithLineNumber,
+                               aRespondWithColumnNumber, aMessageName, aParams);
+  }
+}
+
+template <typename... Params>
+void AsyncLog(nsIInterceptedChannel* aInterceptedChannel,
+              const nsACString& aRespondWithScriptSpec,
+              uint32_t aRespondWithLineNumber,
+              uint32_t aRespondWithColumnNumber,
+              // We have to list one explicit string so that calls with an
+              // nsTArray of params won't end up in here.
+              const nsACString& aMessageName, const nsAString& aFirstParam,
+              Params&&... aParams) {
+  nsTArray<nsString> paramsList(sizeof...(Params) + 1);
+  StringArrayAppender::Append(paramsList, sizeof...(Params) + 1, aFirstParam,
+                              std::forward<Params>(aParams)...);
+  AsyncLog(aInterceptedChannel, aRespondWithScriptSpec, aRespondWithLineNumber,
+           aRespondWithColumnNumber, aMessageName, paramsList);
+}
+
+}  // anonymous namespace
+
+namespace mozilla::dom {
+
+CancelChannelRunnable::CancelChannelRunnable(
+    nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+    nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+    nsresult aStatus)
+    : Runnable("dom::CancelChannelRunnable"),
+      mChannel(aChannel),
+      mRegistration(aRegistration),
+      mStatus(aStatus) {}
+
+NS_IMETHODIMP
+CancelChannelRunnable::Run() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mChannel->CancelInterception(mStatus);
+  mRegistration->MaybeScheduleUpdate();
+  return NS_OK;
+}
+
+FetchEvent::FetchEvent(EventTarget* aOwner)
+    : ExtendableEvent(aOwner),
+      mPreventDefaultLineNumber(0),
+      mPreventDefaultColumnNumber(1),
+      mWaitToRespond(false) {}
+
+FetchEvent::~FetchEvent() = default;
+
+void FetchEvent::PostInit(
+    nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+    nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+    const nsACString& aScriptSpec) {
+  mChannel = aChannel;
+  mRegistration = aRegistration;
+  mScriptSpec.Assign(aScriptSpec);
+}
+
+void FetchEvent::PostInit(const nsACString& aScriptSpec,
+                          RefPtr<FetchEventOp> aRespondWithHandler) {
+  MOZ_ASSERT(aRespondWithHandler);
+
+  mScriptSpec.Assign(aScriptSpec);
+  mRespondWithHandler = std::move(aRespondWithHandler);
+}
+
+/*static*/
+already_AddRefed<FetchEvent> FetchEvent::Constructor(
+    const GlobalObject& aGlobal, const nsAString& aType,
+    const FetchEventInit& aOptions) {
+  RefPtr<EventTarget> owner = do_QueryObject(aGlobal.GetAsSupports());
+  MOZ_ASSERT(owner);
+  RefPtr<FetchEvent> e = new FetchEvent(owner);
+  bool trusted = e->Init(owner);
+  e->InitEvent(aType, aOptions.mBubbles, aOptions.mCancelable);
+  e->SetTrusted(trusted);
+  e->SetComposed(aOptions.mComposed);
+  e->mRequest = aOptions.mRequest;
+  e->mClientId = aOptions.mClientId;
+  e->mResultingClientId = aOptions.mResultingClientId;
+  RefPtr<nsIGlobalObject> global = do_QueryObject(aGlobal.GetAsSupports());
+  MOZ_ASSERT(global);
+  ErrorResult rv;
+  e->mHandled = Promise::Create(global, rv);
+  if (rv.Failed()) {
+    rv.SuppressException();
+    return nullptr;
+  }
+  e->mPreloadResponse = Promise::Create(global, rv);
+  if (rv.Failed()) {
+    rv.SuppressException();
+    return nullptr;
+  }
+  return e.forget();
+}
+
+namespace {
+
+struct RespondWithClosure {
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mInterceptedChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  const nsString mRequestURL;
+  const nsCString mRespondWithScriptSpec;
+  const uint32_t mRespondWithLineNumber;
+  const uint32_t mRespondWithColumnNumber;
+
+  RespondWithClosure(
+      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+      nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      const nsAString& aRequestURL, const nsACString& aRespondWithScriptSpec,
+      uint32_t aRespondWithLineNumber, uint32_t aRespondWithColumnNumber)
+      : mInterceptedChannel(aChannel),
+        mRegistration(aRegistration),
+        mRequestURL(aRequestURL),
+        mRespondWithScriptSpec(aRespondWithScriptSpec),
+        mRespondWithLineNumber(aRespondWithLineNumber),
+        mRespondWithColumnNumber(aRespondWithColumnNumber) {}
+};
+
+class FinishResponse final : public Runnable {
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mChannel;
+
+ public:
+  explicit FinishResponse(
+      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel)
+      : Runnable("dom::FinishResponse"), mChannel(aChannel) {}
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsresult rv = mChannel->FinishSynthesizedResponse();
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+      return NS_OK;
+    }
+
+    return rv;
+  }
+};
+
+class BodyCopyHandle final : public nsIInterceptedBodyCallback {
+  UniquePtr<RespondWithClosure> mClosure;
+
+  ~BodyCopyHandle() = default;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  explicit BodyCopyHandle(UniquePtr<RespondWithClosure>&& aClosure)
+      : mClosure(std::move(aClosure)) {}
+
+  NS_IMETHOD
+  BodyComplete(nsresult aRv) override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsCOMPtr<nsIRunnable> event;
+    if (NS_WARN_IF(NS_FAILED(aRv))) {
+      ::AsyncLog(
+          mClosure->mInterceptedChannel, mClosure->mRespondWithScriptSpec,
+          mClosure->mRespondWithLineNumber, mClosure->mRespondWithColumnNumber,
+          "InterceptionFailedWithURL"_ns, mClosure->mRequestURL);
+      event = new CancelChannelRunnable(mClosure->mInterceptedChannel,
+                                        mClosure->mRegistration,
+                                        NS_ERROR_INTERCEPTION_FAILED);
+    } else {
+      event = new FinishResponse(mClosure->mInterceptedChannel);
+    }
+
+    mClosure.reset();
+
+    event->Run();
+
+    return NS_OK;
+  }
+};
+
+NS_IMPL_ISUPPORTS(BodyCopyHandle, nsIInterceptedBodyCallback)
+
+class StartResponse final : public Runnable {
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mChannel;
+  SafeRefPtr<InternalResponse> mInternalResponse;
+  ChannelInfo mWorkerChannelInfo;
+  const nsCString mScriptSpec;
+  const nsCString mResponseURLSpec;
+  UniquePtr<RespondWithClosure> mClosure;
+
+ public:
+  StartResponse(nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+                SafeRefPtr<InternalResponse> aInternalResponse,
+                const ChannelInfo& aWorkerChannelInfo,
+                const nsACString& aScriptSpec,
+                const nsACString& aResponseURLSpec,
+                UniquePtr<RespondWithClosure>&& aClosure)
+      : Runnable("dom::StartResponse"),
+        mChannel(aChannel),
+        mInternalResponse(std::move(aInternalResponse)),
+        mWorkerChannelInfo(aWorkerChannelInfo),
+        mScriptSpec(aScriptSpec),
+        mResponseURLSpec(aResponseURLSpec),
+        mClosure(std::move(aClosure)) {}
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsCOMPtr<nsIChannel> underlyingChannel;
+    nsresult rv = mChannel->GetChannel(getter_AddRefs(underlyingChannel));
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(underlyingChannel, NS_ERROR_UNEXPECTED);
+    nsCOMPtr<nsILoadInfo> loadInfo = underlyingChannel->LoadInfo();
+
+    if (!CSPPermitsResponse(loadInfo)) {
+      mChannel->CancelInterception(NS_ERROR_CONTENT_BLOCKED);
+      return NS_OK;
+    }
+
+    ChannelInfo channelInfo;
+    if (mInternalResponse->GetChannelInfo().IsInitialized()) {
+      channelInfo = mInternalResponse->GetChannelInfo();
+    } else {
+      // We are dealing with a synthesized response here, so fall back to the
+      // channel info for the worker script.
+      channelInfo = mWorkerChannelInfo;
+    }
+    rv = mChannel->SetChannelInfo(&channelInfo);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+      return NS_OK;
+    }
+
+    rv = mChannel->SynthesizeStatus(
+        mInternalResponse->GetUnfilteredStatus(),
+        mInternalResponse->GetUnfilteredStatusText());
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+      return NS_OK;
+    }
+
+    AutoTArray<InternalHeaders::Entry, 5> entries;
+    mInternalResponse->UnfilteredHeaders()->GetEntries(entries);
+    for (uint32_t i = 0; i < entries.Length(); ++i) {
+      mChannel->SynthesizeHeader(entries[i].mName, entries[i].mValue);
+    }
+
+    auto castLoadInfo = static_cast<mozilla::net::LoadInfo*>(loadInfo.get());
+    castLoadInfo->SynthesizeServiceWorkerTainting(
+        mInternalResponse->GetTainting());
+
+    // Get the preferred alternative data type of outter channel
+    nsAutoCString preferredAltDataType(""_ns);
+    nsCOMPtr<nsICacheInfoChannel> outerChannel =
+        do_QueryInterface(underlyingChannel);
+    if (outerChannel &&
+        !outerChannel->PreferredAlternativeDataTypes().IsEmpty()) {
+      // TODO: handle multiple types properly.
+      preferredAltDataType.Assign(
+          outerChannel->PreferredAlternativeDataTypes()[0].type());
+    }
+
+    // Get the alternative data type saved in the InternalResponse
+    nsAutoCString altDataType;
+    nsCOMPtr<nsICacheInfoChannel> cacheInfoChannel =
+        mInternalResponse->TakeCacheInfoChannel().get();
+    if (cacheInfoChannel) {
+      cacheInfoChannel->GetAlternativeDataType(altDataType);
+    }
+
+    nsCOMPtr<nsIInputStream> body;
+    if (preferredAltDataType.Equals(altDataType)) {
+      body = mInternalResponse->TakeAlternativeBody();
+    }
+    if (!body) {
+      mInternalResponse->GetUnfilteredBody(getter_AddRefs(body));
+    } else {
+      Telemetry::ScalarAdd(Telemetry::ScalarID::SW_ALTERNATIVE_BODY_USED_COUNT,
+                           1);
+    }
+
+    RefPtr<BodyCopyHandle> copyHandle;
+    copyHandle = new BodyCopyHandle(std::move(mClosure));
+
+    rv = mChannel->StartSynthesizedResponse(body, copyHandle, cacheInfoChannel,
+                                            mResponseURLSpec,
+                                            mInternalResponse->IsRedirected());
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
+    if (obsService) {
+      obsService->NotifyObservers(
+          underlyingChannel, "service-worker-synthesized-response", nullptr);
+    }
+
+    return rv;
+  }
+
+  bool CSPPermitsResponse(nsILoadInfo* aLoadInfo) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aLoadInfo);
+    nsresult rv;
+    nsCOMPtr<nsIURI> uri;
+    nsCString url = mInternalResponse->GetUnfilteredURL();
+    if (url.IsEmpty()) {
+      // Synthetic response. The buck stops at the worker script.
+      url = mScriptSpec;
+    }
+    rv = NS_NewURI(getter_AddRefs(uri), url);
+    NS_ENSURE_SUCCESS(rv, false);
+    int16_t decision = nsIContentPolicy::ACCEPT;
+    rv = NS_CheckContentLoadPolicy(uri, aLoadInfo, &decision);
+    NS_ENSURE_SUCCESS(rv, false);
+    return decision == nsIContentPolicy::ACCEPT;
+  }
+};
+
+class RespondWithHandler final : public PromiseNativeHandler {
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mInterceptedChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  const RequestMode mRequestMode;
+  const RequestRedirect mRequestRedirectMode;
+#ifdef DEBUG
+  const bool mIsClientRequest;
+#endif
+  const nsCString mScriptSpec;
+  const nsString mRequestURL;
+  const nsCString mRequestFragment;
+  const nsCString mRespondWithScriptSpec;
+  const uint32_t mRespondWithLineNumber;
+  const uint32_t mRespondWithColumnNumber;
+  bool mRequestWasHandled;
+
+ public:
+  NS_DECL_ISUPPORTS
+
+  RespondWithHandler(
+      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+      nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      RequestMode aRequestMode, bool aIsClientRequest,
+      RequestRedirect aRedirectMode, const nsACString& aScriptSpec,
+      const nsAString& aRequestURL, const nsACString& aRequestFragment,
+      const nsACString& aRespondWithScriptSpec, uint32_t aRespondWithLineNumber,
+      uint32_t aRespondWithColumnNumber)
+      : mInterceptedChannel(aChannel),
+        mRegistration(aRegistration),
+        mRequestMode(aRequestMode),
+        mRequestRedirectMode(aRedirectMode)
+#ifdef DEBUG
+        ,
+        mIsClientRequest(aIsClientRequest)
+#endif
+        ,
+        mScriptSpec(aScriptSpec),
+        mRequestURL(aRequestURL),
+        mRequestFragment(aRequestFragment),
+        mRespondWithScriptSpec(aRespondWithScriptSpec),
+        mRespondWithLineNumber(aRespondWithLineNumber),
+        mRespondWithColumnNumber(aRespondWithColumnNumber),
+        mRequestWasHandled(false) {
+  }
+
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  void CancelRequest(nsresult aStatus);
+
+  void AsyncLog(const nsACString& aMessageName,
+                const nsTArray<nsString>& aParams) {
+    ::AsyncLog(mInterceptedChannel, mRespondWithScriptSpec,
+               mRespondWithLineNumber, mRespondWithColumnNumber, aMessageName,
+               aParams);
+  }
+
+  void AsyncLog(const nsACString& aSourceSpec, uint32_t aLine, uint32_t aColumn,
+                const nsACString& aMessageName,
+                const nsTArray<nsString>& aParams) {
+    ::AsyncLog(mInterceptedChannel, aSourceSpec, aLine, aColumn, aMessageName,
+               aParams);
+  }
+
+ private:
+  ~RespondWithHandler() {
+    if (!mRequestWasHandled) {
+      ::AsyncLog(mInterceptedChannel, mRespondWithScriptSpec,
+                 mRespondWithLineNumber, mRespondWithColumnNumber,
+                 "InterceptionFailedWithURL"_ns, mRequestURL);
+      CancelRequest(NS_ERROR_INTERCEPTION_FAILED);
+    }
+  }
+};
+
+class MOZ_STACK_CLASS AutoCancel {
+  RefPtr<RespondWithHandler> mOwner;
+  nsCString mSourceSpec;
+  uint32_t mLine;
+  uint32_t mColumn;
+  nsCString mMessageName;
+  nsTArray<nsString> mParams;
+
+ public:
+  AutoCancel(RespondWithHandler* aOwner, const nsString& aRequestURL)
+      : mOwner(aOwner),
+        mLine(0),
+        mColumn(0),
+        mMessageName("InterceptionFailedWithURL"_ns) {
+    mParams.AppendElement(aRequestURL);
+  }
+
+  ~AutoCancel() {
+    if (mOwner) {
+      if (mSourceSpec.IsEmpty()) {
+        mOwner->AsyncLog(mMessageName, mParams);
+      } else {
+        mOwner->AsyncLog(mSourceSpec, mLine, mColumn, mMessageName, mParams);
+      }
+      mOwner->CancelRequest(NS_ERROR_INTERCEPTION_FAILED);
+    }
+  }
+
+  // This function steals the error message from a ErrorResult.
+  void SetCancelErrorResult(JSContext* aCx, ErrorResult& aRv) {
+    MOZ_DIAGNOSTIC_ASSERT(aRv.Failed());
+    MOZ_DIAGNOSTIC_ASSERT(!JS_IsExceptionPending(aCx));
+
+    // Storing the error as exception in the JSContext.
+    if (!aRv.MaybeSetPendingException(aCx)) {
+      return;
+    }
+
+    MOZ_ASSERT(!aRv.Failed());
+
+    // Let's take the pending exception.
+    JS::ExceptionStack exnStack(aCx);
+    if (!JS::StealPendingExceptionStack(aCx, &exnStack)) {
+      return;
+    }
+
+    // Converting the exception in a JS::ErrorReportBuilder.
+    JS::ErrorReportBuilder report(aCx);
+    if (!report.init(aCx, exnStack, JS::ErrorReportBuilder::WithSideEffects)) {
+      JS_ClearPendingException(aCx);
+      return;
+    }
+
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+
+    // Let's store the error message here.
+    mMessageName.Assign(report.toStringResult().c_str());
+    mParams.Clear();
+  }
+
+  template <typename... Params>
+  void SetCancelMessage(const nsACString& aMessageName, Params&&... aParams) {
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+    mMessageName = aMessageName;
+    mParams.Clear();
+    StringArrayAppender::Append(mParams, sizeof...(Params),
+                                std::forward<Params>(aParams)...);
+  }
+
+  template <typename... Params>
+  void SetCancelMessageAndLocation(const nsACString& aSourceSpec,
+                                   uint32_t aLine, uint32_t aColumn,
+                                   const nsACString& aMessageName,
+                                   Params&&... aParams) {
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+
+    mSourceSpec = aSourceSpec;
+    mLine = aLine;
+    mColumn = aColumn;
+
+    mMessageName = aMessageName;
+    mParams.Clear();
+    StringArrayAppender::Append(mParams, sizeof...(Params),
+                                std::forward<Params>(aParams)...);
+  }
+
+  void Reset() { mOwner = nullptr; }
+};
+
+NS_IMPL_ISUPPORTS0(RespondWithHandler)
+
+void RespondWithHandler::ResolvedCallback(JSContext* aCx,
+                                          JS::Handle<JS::Value> aValue,
+                                          ErrorResult& aRv) {
+  AutoCancel autoCancel(this, mRequestURL);
+
+  if (!aValue.isObject()) {
+    NS_WARNING(
+        "FetchEvent::RespondWith was passed a promise resolved to a non-Object "
+        "value");
+
+    nsCString sourceSpec;
+    uint32_t line = 0;
+    uint32_t column = 0;
+    nsString valueString;
+    nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                       valueString);
+
+    autoCancel.SetCancelMessageAndLocation(sourceSpec, line, column,
+                                           "InterceptedNonResponseWithURL"_ns,
+                                           mRequestURL, valueString);
+    return;
+  }
+
+  RefPtr<Response> response;
+  nsresult rv = UNWRAP_OBJECT(Response, &aValue.toObject(), response);
+  if (NS_FAILED(rv)) {
+    nsCString sourceSpec;
+    uint32_t line = 0;
+    uint32_t column = 0;
+    nsString valueString;
+    nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                       valueString);
+
+    autoCancel.SetCancelMessageAndLocation(sourceSpec, line, column,
+                                           "InterceptedNonResponseWithURL"_ns,
+                                           mRequestURL, valueString);
+    return;
+  }
+
+  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(worker);
+  worker->AssertIsOnWorkerThread();
+
+  // Section "HTTP Fetch", step 3.3:
+  //  If one of the following conditions is true, return a network error:
+  //    * response's type is "error".
+  //    * request's mode is not "no-cors" and response's type is "opaque".
+  //    * request's redirect mode is not "manual" and response's type is
+  //      "opaqueredirect".
+  //    * request's redirect mode is not "follow" and response's url list
+  //      has more than one item.
+
+  if (response->Type() == ResponseType::Error) {
+    autoCancel.SetCancelMessage("InterceptedErrorResponseWithURL"_ns,
+                                mRequestURL);
+    return;
+  }
+
+  MOZ_ASSERT_IF(mIsClientRequest, mRequestMode == RequestMode::Same_origin ||
+                                      mRequestMode == RequestMode::Navigate);
+
+  if (response->Type() == ResponseType::Opaque &&
+      mRequestMode != RequestMode::No_cors) {
+    NS_ConvertASCIItoUTF16 modeString(
+        RequestModeValues::GetString(mRequestMode));
+
+    autoCancel.SetCancelMessage("BadOpaqueInterceptionRequestModeWithURL"_ns,
+                                mRequestURL, modeString);
+    return;
+  }
+
+  if (mRequestRedirectMode != RequestRedirect::Manual &&
+      response->Type() == ResponseType::Opaqueredirect) {
+    autoCancel.SetCancelMessage("BadOpaqueRedirectInterceptionWithURL"_ns,
+                                mRequestURL);
+    return;
+  }
+
+  if (mRequestRedirectMode != RequestRedirect::Follow &&
+      response->Redirected()) {
+    autoCancel.SetCancelMessage("BadRedirectModeInterceptionWithURL"_ns,
+                                mRequestURL);
+    return;
+  }
+
+  if (NS_WARN_IF(response->BodyUsed())) {
+    autoCancel.SetCancelMessage("InterceptedUsedResponseWithURL"_ns,
+                                mRequestURL);
+    return;
+  }
+
+  SafeRefPtr<InternalResponse> ir = response->GetInternalResponse();
+  if (NS_WARN_IF(!ir)) {
+    return;
+  }
+
+  // An extra safety check to make sure our invariant that opaque and cors
+  // responses always have a URL does not break.
+  if (NS_WARN_IF((response->Type() == ResponseType::Opaque ||
+                  response->Type() == ResponseType::Cors) &&
+                 ir->GetUnfilteredURL().IsEmpty())) {
+    MOZ_DIAGNOSTIC_ASSERT(false, "Cors or opaque Response without a URL");
+    return;
+  }
+
+  if (mRequestMode == RequestMode::Same_origin &&
+      response->Type() == ResponseType::Cors) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::SW_CORS_RES_FOR_SO_REQ_COUNT, 1);
+
+    // XXXtt: Will have a pref to enable the quirk response in bug 1419684.
+    // The variadic template provided by StringArrayAppender requires exactly
+    // an nsString.
+    NS_ConvertUTF8toUTF16 responseURL(ir->GetUnfilteredURL());
+    autoCancel.SetCancelMessage("CorsResponseForSameOriginRequest"_ns,
+                                mRequestURL, responseURL);
+    return;
+  }
+
+  // Propagate the URL to the content if the request mode is not "navigate".
+  // Note that, we only reflect the final URL if the response.redirected is
+  // false. We propagate all the URLs if the response.redirected is true.
+  nsCString responseURL;
+  if (mRequestMode != RequestMode::Navigate) {
+    responseURL = ir->GetUnfilteredURL();
+
+    // Similar to how we apply the request fragment to redirects automatically
+    // we also want to apply it automatically when propagating the response
+    // URL from a service worker interception.  Currently response.url strips
+    // the fragment, so this will never conflict with an existing fragment
+    // on the response.  In the future we will have to check for a response
+    // fragment and avoid overriding in that case.
+    if (!mRequestFragment.IsEmpty() && !responseURL.IsEmpty()) {
+      MOZ_ASSERT(!responseURL.Contains('#'));
+      responseURL.Append("#"_ns);
+      responseURL.Append(mRequestFragment);
+    }
+  }
+
+  UniquePtr<RespondWithClosure> closure(new RespondWithClosure(
+      mInterceptedChannel, mRegistration, mRequestURL, mRespondWithScriptSpec,
+      mRespondWithLineNumber, mRespondWithColumnNumber));
+
+  nsCOMPtr<nsIRunnable> startRunnable = new StartResponse(
+      mInterceptedChannel, ir.clonePtr(), worker->GetChannelInfo(), mScriptSpec,
+      responseURL, std::move(closure));
+
+  nsCOMPtr<nsIInputStream> body;
+  ir->GetUnfilteredBody(getter_AddRefs(body));
+  // Errors and redirects may not have a body.
+  if (body) {
+    ErrorResult error;
+    response->SetBodyUsed(aCx, error);
+    error.WouldReportJSException();
+    if (NS_WARN_IF(error.Failed())) {
+      autoCancel.SetCancelErrorResult(aCx, error);
+      return;
+    }
+  }
+
+  MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(startRunnable.forget()));
+
+  MOZ_ASSERT(!closure);
+  autoCancel.Reset();
+  mRequestWasHandled = true;
+}
+
+void RespondWithHandler::RejectedCallback(JSContext* aCx,
+                                          JS::Handle<JS::Value> aValue,
+                                          ErrorResult& aRv) {
+  nsCString sourceSpec = mRespondWithScriptSpec;
+  uint32_t line = mRespondWithLineNumber;
+  uint32_t column = mRespondWithColumnNumber;
+  nsString valueString;
+
+  nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                     valueString);
+
+  ::AsyncLog(mInterceptedChannel, sourceSpec, line, column,
+             "InterceptionRejectedResponseWithURL"_ns, mRequestURL,
+             valueString);
+
+  CancelRequest(NS_ERROR_INTERCEPTION_FAILED);
+}
+
+void RespondWithHandler::CancelRequest(nsresult aStatus) {
+  nsCOMPtr<nsIRunnable> runnable =
+      new CancelChannelRunnable(mInterceptedChannel, mRegistration, aStatus);
+  // Note, this may run off the worker thread during worker termination.
+  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+  if (worker) {
+    MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(runnable.forget()));
+  } else {
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable.forget()));
+  }
+  mRequestWasHandled = true;
+}
+
+}  // namespace
+
+void FetchEvent::RespondWith(JSContext* aCx, Promise& aArg, ErrorResult& aRv) {
+  if (!GetDispatchFlag() || mWaitToRespond) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  // Record where respondWith() was called in the script so we can include the
+  // information in any error reporting.  We should be guaranteed not to get
+  // a file:// string here because service workers require http/https.
+  nsCString spec;
+  uint32_t line = 0;
+  uint32_t column = 1;
+  nsJSUtils::GetCallingLocation(aCx, spec, &line, &column);
+
+  SafeRefPtr<InternalRequest> ir = mRequest->GetInternalRequest();
+
+  nsAutoCString requestURL;
+  ir->GetURL(requestURL);
+
+  StopImmediatePropagation();
+  mWaitToRespond = true;
+
+  if (mChannel) {
+    RefPtr<RespondWithHandler> handler = new RespondWithHandler(
+        mChannel, mRegistration, mRequest->Mode(), ir->IsClientRequest(),
+        mRequest->Redirect(), mScriptSpec, NS_ConvertUTF8toUTF16(requestURL),
+        ir->GetFragment(), spec, line, column);
+
+    aArg.AppendNativeHandler(handler);
+    // mRespondWithHandler can be nullptr for self-dispatched FetchEvent.
+  } else if (mRespondWithHandler) {
+    mRespondWithHandler->RespondWithCalledAt(spec, line, column);
+    aArg.AppendNativeHandler(mRespondWithHandler);
+    mRespondWithHandler = nullptr;
+  }
+
+  if (!WaitOnPromise(aArg)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+  }
+}
+
+void FetchEvent::PreventDefault(JSContext* aCx, CallerType aCallerType) {
+  MOZ_ASSERT(aCx);
+  MOZ_ASSERT(aCallerType != CallerType::System,
+             "Since when do we support system-principal service workers?");
+
+  if (mPreventDefaultScriptSpec.IsEmpty()) {
+    // Note when the FetchEvent might have been canceled by script, but don't
+    // actually log the location until we are sure it matters.  This is
+    // determined in ServiceWorkerPrivate.cpp.  We only remember the first
+    // call to preventDefault() as its the most likely to have actually canceled
+    // the event.
+    nsJSUtils::GetCallingLocation(aCx, mPreventDefaultScriptSpec,
+                                  &mPreventDefaultLineNumber,
+                                  &mPreventDefaultColumnNumber);
+  }
+
+  Event::PreventDefault(aCx, aCallerType);
+}
+
+void FetchEvent::ReportCanceled() {
+  MOZ_ASSERT(!mPreventDefaultScriptSpec.IsEmpty());
+
+  SafeRefPtr<InternalRequest> ir = mRequest->GetInternalRequest();
+  nsAutoCString url;
+  ir->GetURL(url);
+
+  // The variadic template provided by StringArrayAppender requires exactly
+  // an nsString.
+  NS_ConvertUTF8toUTF16 requestURL(url);
+  // nsString requestURL;
+  // CopyUTF8toUTF16(url, requestURL);
+
+  if (mChannel) {
+    ::AsyncLog(mChannel.get(), mPreventDefaultScriptSpec,
+               mPreventDefaultLineNumber, mPreventDefaultColumnNumber,
+               "InterceptionCanceledWithURL"_ns, requestURL);
+    // mRespondWithHandler could be nullptr for self-dispatched FetchEvent.
+  } else if (mRespondWithHandler) {
+    mRespondWithHandler->ReportCanceled(mPreventDefaultScriptSpec,
+                                        mPreventDefaultLineNumber,
+                                        mPreventDefaultColumnNumber);
+    mRespondWithHandler = nullptr;
+  }
+}
+
+namespace {
+
+class WaitUntilHandler final : public PromiseNativeHandler {
+  WorkerPrivate* mWorkerPrivate;
+  const nsCString mScope;
+  nsString mSourceSpec;
+  uint32_t mLine;
+  uint32_t mColumn;
+  nsString mRejectValue;
+
+  ~WaitUntilHandler() = default;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  WaitUntilHandler(WorkerPrivate* aWorkerPrivate, JSContext* aCx)
+      : mWorkerPrivate(aWorkerPrivate),
+        mScope(mWorkerPrivate->ServiceWorkerScope()),
+        mLine(0),
+        mColumn(1) {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+
+    // Save the location of the waitUntil() call itself as a fallback
+    // in case the rejection value does not contain any location info.
+    nsJSUtils::GetCallingLocation(aCx, mSourceSpec, &mLine, &mColumn);
+  }
+
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValu,
+                        ErrorResult& aRve) override {
+    // do nothing, we are only here to report errors
+  }
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+
+    nsString spec;
+    uint32_t line = 0;
+    uint32_t column = 0;
+    nsContentUtils::ExtractErrorValues(aCx, aValue, spec, &line, &column,
+                                       mRejectValue);
+
+    // only use the extracted location if we found one
+    if (!spec.IsEmpty()) {
+      mSourceSpec = spec;
+      mLine = line;
+      mColumn = column;
+    }
+
+    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(
+        NewRunnableMethod("WaitUntilHandler::ReportOnMainThread", this,
+                          &WaitUntilHandler::ReportOnMainThread)));
+  }
+
+  void ReportOnMainThread() {
+    MOZ_ASSERT(NS_IsMainThread());
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+    if (!swm) {
+      // browser shutdown
+      return;
+    }
+
+    // TODO: Make the error message a localized string. (bug 1222720)
+    nsString message;
+    message.AppendLiteral(
+        "Service worker event waitUntil() was passed a "
+        "promise that rejected with '");
+    message.Append(mRejectValue);
+    message.AppendLiteral("'.");
+
+    // Note, there is a corner case where this won't report to the window
+    // that triggered the error.  Consider a navigation fetch event that
+    // rejects waitUntil() without holding respondWith() open.  In this case
+    // there is no controlling document yet, the window did call .register()
+    // because there is no documeny yet, and the navigation is no longer
+    // being intercepted.
+
+    swm->ReportToAllClients(mScope, message, mSourceSpec, u""_ns, mLine,
+                            mColumn, nsIScriptError::errorFlag);
+  }
+};
+
+NS_IMPL_ISUPPORTS0(WaitUntilHandler)
+
+}  // anonymous namespace
+
+ExtendableEvent::ExtensionsHandler::~ExtensionsHandler() {
+  MOZ_ASSERT(!mExtendableEvent);
+}
+
+bool ExtendableEvent::ExtensionsHandler::GetDispatchFlag() const {
+  // mExtendableEvent should set itself as nullptr in its destructor, and we
+  // can't be dispatching an event that doesn't exist, so this should work for
+  // as long as it's not needed to determine whether the event is still alive,
+  // which seems unlikely.
+  if (!mExtendableEvent) {
+    return false;
+  }
+
+  return mExtendableEvent->GetDispatchFlag();
+}
+
+void ExtendableEvent::ExtensionsHandler::SetExtendableEvent(
+    const ExtendableEvent* const aExtendableEvent) {
+  mExtendableEvent = aExtendableEvent;
+}
+
+NS_IMPL_ADDREF_INHERITED(FetchEvent, ExtendableEvent)
+NS_IMPL_RELEASE_INHERITED(FetchEvent, ExtendableEvent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FetchEvent)
+NS_INTERFACE_MAP_END_INHERITING(ExtendableEvent)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(FetchEvent, ExtendableEvent, mRequest,
+                                   mHandled, mPreloadResponse)
+
+ExtendableEvent::ExtendableEvent(EventTarget* aOwner)
+    : Event(aOwner, nullptr, nullptr) {}
+
+bool ExtendableEvent::WaitOnPromise(Promise& aPromise) {
+  if (!mExtensionsHandler) {
+    return false;
+  }
+  return mExtensionsHandler->WaitOnPromise(aPromise);
+}
+
+void ExtendableEvent::SetKeepAliveHandler(
+    ExtensionsHandler* aExtensionsHandler) {
+  MOZ_ASSERT(!mExtensionsHandler);
+  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(worker);
+  worker->AssertIsOnWorkerThread();
+  mExtensionsHandler = aExtensionsHandler;
+  mExtensionsHandler->SetExtendableEvent(this);
+}
+
+void ExtendableEvent::WaitUntil(JSContext* aCx, Promise& aPromise,
+                                ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  if (!WaitOnPromise(aPromise)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  // Append our handler to each waitUntil promise separately so we
+  // can record the location in script where waitUntil was called.
+  RefPtr<WaitUntilHandler> handler =
+      new WaitUntilHandler(GetCurrentThreadWorkerPrivate(), aCx);
+  aPromise.AppendNativeHandler(handler);
+}
+
+NS_IMPL_ADDREF_INHERITED(ExtendableEvent, Event)
+NS_IMPL_RELEASE_INHERITED(ExtendableEvent, Event)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ExtendableEvent)
+NS_INTERFACE_MAP_END_INHERITING(Event)
+
+namespace {
+nsresult ExtractBytesFromUSVString(const nsAString& aStr,
+                                   nsTArray<uint8_t>& aBytes) {
+  MOZ_ASSERT(aBytes.IsEmpty());
+  auto encoder = UTF_8_ENCODING->NewEncoder();
+  CheckedInt<size_t> needed =
+      encoder->MaxBufferLengthFromUTF16WithoutReplacement(aStr.Length());
+  if (NS_WARN_IF(!needed.isValid() ||
+                 !aBytes.SetLength(needed.value(), fallible))) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  uint32_t result;
+  size_t read;
+  size_t written;
+  // Do not use structured binding lest deal with [-Werror=unused-variable]
+  std::tie(result, read, written) =
+      encoder->EncodeFromUTF16WithoutReplacement(aStr, aBytes, true);
+  MOZ_ASSERT(result == kInputEmpty);
+  MOZ_ASSERT(read == aStr.Length());
+  aBytes.TruncateLength(written);
+  return NS_OK;
+}
+
+nsresult ExtractBytesFromData(
+    const OwningArrayBufferViewOrArrayBufferOrUSVString& aDataInit,
+    nsTArray<uint8_t>& aBytes) {
+  MOZ_ASSERT(aBytes.IsEmpty());
+  Maybe<bool> result = AppendTypedArrayDataTo(aDataInit, aBytes);
+  if (result.isSome()) {
+    return NS_WARN_IF(!result.value()) ? NS_ERROR_OUT_OF_MEMORY : NS_OK;
+  }
+  if (aDataInit.IsUSVString()) {
+    return ExtractBytesFromUSVString(aDataInit.GetAsUSVString(), aBytes);
+  }
+  MOZ_ASSERT_UNREACHABLE("Unexpected push message data");
+  return NS_ERROR_FAILURE;
+}
+}  // namespace
+
+PushMessageData::PushMessageData(nsIGlobalObject* aOwner,
+                                 nsTArray<uint8_t>&& aBytes)
+    : mOwner(aOwner), mBytes(std::move(aBytes)) {}
+
+PushMessageData::~PushMessageData() = default;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PushMessageData, mOwner)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PushMessageData)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PushMessageData)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PushMessageData)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject* PushMessageData::WrapObject(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return mozilla::dom::PushMessageData_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void PushMessageData::Json(JSContext* cx, JS::MutableHandle<JS::Value> aRetval,
+                           ErrorResult& aRv) {
+  if (NS_FAILED(EnsureDecodedText())) {
+    aRv.Throw(NS_ERROR_DOM_UNKNOWN_ERR);
+    return;
+  }
+  BodyUtil::ConsumeJson(cx, aRetval, mDecodedText, aRv);
+}
+
+void PushMessageData::Text(nsAString& aData) {
+  if (NS_SUCCEEDED(EnsureDecodedText())) {
+    aData = mDecodedText;
+  }
+}
+
+void PushMessageData::ArrayBuffer(JSContext* cx,
+                                  JS::MutableHandle<JSObject*> aRetval,
+                                  ErrorResult& aRv) {
+  uint8_t* data = GetContentsCopy();
+  if (data) {
+    UniquePtr<uint8_t[], JS::FreePolicy> dataPtr(data);
+    BodyUtil::ConsumeArrayBuffer(cx, aRetval, mBytes.Length(),
+                                 std::move(dataPtr), aRv);
+  }
+}
+
+already_AddRefed<mozilla::dom::Blob> PushMessageData::Blob(ErrorResult& aRv) {
+  uint8_t* data = GetContentsCopy();
+  if (data) {
+    RefPtr<mozilla::dom::Blob> blob =
+        BodyUtil::ConsumeBlob(mOwner, u""_ns, mBytes.Length(), data, aRv);
+    if (blob) {
+      return blob.forget();
+    }
+  }
+  return nullptr;
+}
+
+nsresult PushMessageData::EnsureDecodedText() {
+  if (mBytes.IsEmpty() || !mDecodedText.IsEmpty()) {
+    return NS_OK;
+  }
+  nsresult rv = BodyUtil::ConsumeText(
+      mBytes.Length(), reinterpret_cast<uint8_t*>(mBytes.Elements()),
+      mDecodedText);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    mDecodedText.Truncate();
+    return rv;
+  }
+  return NS_OK;
+}
+
+uint8_t* PushMessageData::GetContentsCopy() {
+  uint32_t length = mBytes.Length();
+  void* data = malloc(length);
+  if (!data) {
+    return nullptr;
+  }
+  memcpy(data, mBytes.Elements(), length);
+  return reinterpret_cast<uint8_t*>(data);
+}
+
+PushEvent::PushEvent(EventTarget* aOwner) : ExtendableEvent(aOwner) {}
+
+already_AddRefed<PushEvent> PushEvent::Constructor(
+    mozilla::dom::EventTarget* aOwner, const nsAString& aType,
+    const PushEventInit& aOptions, ErrorResult& aRv) {
+  RefPtr<PushEvent> e = new PushEvent(aOwner);
+  bool trusted = e->Init(aOwner);
+  e->InitEvent(aType, aOptions.mBubbles, aOptions.mCancelable);
+  e->SetTrusted(trusted);
+  e->SetComposed(aOptions.mComposed);
+  if (aOptions.mData.WasPassed()) {
+    nsTArray<uint8_t> bytes;
+    nsresult rv = ExtractBytesFromData(aOptions.mData.Value(), bytes);
+    if (NS_FAILED(rv)) {
+      aRv.Throw(rv);
+      return nullptr;
+    }
+    e->mData = new PushMessageData(aOwner->GetOwnerGlobal(), std::move(bytes));
+  }
+  return e.forget();
+}
+
+NS_IMPL_ADDREF_INHERITED(PushEvent, ExtendableEvent)
+NS_IMPL_RELEASE_INHERITED(PushEvent, ExtendableEvent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PushEvent)
+NS_INTERFACE_MAP_END_INHERITING(ExtendableEvent)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(PushEvent, ExtendableEvent, mData)
+
+JSObject* PushEvent::WrapObjectInternal(JSContext* aCx,
+                                        JS::Handle<JSObject*> aGivenProto) {
+  return mozilla::dom::PushEvent_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+ExtendableMessageEvent::ExtendableMessageEvent(EventTarget* aOwner)
+    : ExtendableEvent(aOwner), mData(JS::UndefinedValue()) {
+  mozilla::HoldJSObjects(this);
+}
+
+ExtendableMessageEvent::~ExtendableMessageEvent() { DropJSObjects(this); }
+
+void ExtendableMessageEvent::GetData(JSContext* aCx,
+                                     JS::MutableHandle<JS::Value> aData,
+                                     ErrorResult& aRv) {
+  aData.set(mData);
+  if (!JS_WrapValue(aCx, aData)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+  }
+}
+
+void ExtendableMessageEvent::GetSource(
+    Nullable<OwningClientOrServiceWorkerOrMessagePort>& aValue) const {
+  if (mClient) {
+    aValue.SetValue().SetAsClient() = mClient;
+  } else if (mServiceWorker) {
+    aValue.SetValue().SetAsServiceWorker() = mServiceWorker;
+  } else if (mMessagePort) {
+    aValue.SetValue().SetAsMessagePort() = mMessagePort;
+  } else {
+    // nullptr source is possible for manually constructed event
+    aValue.SetNull();
+  }
+}
+
+/* static */
+already_AddRefed<ExtendableMessageEvent> ExtendableMessageEvent::Constructor(
+    const GlobalObject& aGlobal, const nsAString& aType,
+    const ExtendableMessageEventInit& aOptions) {
+  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
+  return Constructor(t, aType, aOptions);
+}
+
+/* static */
+already_AddRefed<ExtendableMessageEvent> ExtendableMessageEvent::Constructor(
+    mozilla::dom::EventTarget* aEventTarget, const nsAString& aType,
+    const ExtendableMessageEventInit& aOptions) {
+  RefPtr<ExtendableMessageEvent> event =
+      new ExtendableMessageEvent(aEventTarget);
+
+  event->InitEvent(aType, aOptions.mBubbles, aOptions.mCancelable);
+  bool trusted = event->Init(aEventTarget);
+  event->SetTrusted(trusted);
+
+  event->mData = aOptions.mData;
+  event->mOrigin = aOptions.mOrigin;
+  event->mLastEventId = aOptions.mLastEventId;
+
+  if (!aOptions.mSource.IsNull()) {
+    if (aOptions.mSource.Value().IsClient()) {
+      event->mClient = aOptions.mSource.Value().GetAsClient();
+    } else if (aOptions.mSource.Value().IsServiceWorker()) {
+      event->mServiceWorker = aOptions.mSource.Value().GetAsServiceWorker();
+    } else if (aOptions.mSource.Value().IsMessagePort()) {
+      event->mMessagePort = aOptions.mSource.Value().GetAsMessagePort();
+    }
+  }
+
+  event->mPorts.AppendElements(aOptions.mPorts);
+  return event.forget();
+}
+
+void ExtendableMessageEvent::GetPorts(nsTArray<RefPtr<MessagePort>>& aPorts) {
+  aPorts = mPorts.Clone();
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ExtendableMessageEvent)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ExtendableMessageEvent, Event)
+  tmp->mData.setUndefined();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mClient)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mServiceWorker)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessagePort)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mPorts)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ExtendableMessageEvent, Event)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mClient)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mServiceWorker)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMessagePort)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPorts)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(ExtendableMessageEvent, Event)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ExtendableMessageEvent)
+NS_INTERFACE_MAP_END_INHERITING(Event)
+
+NS_IMPL_ADDREF_INHERITED(ExtendableMessageEvent, Event)
+NS_IMPL_RELEASE_INHERITED(ExtendableMessageEvent, Event)
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerEvents.h b/dom/serviceworkers/ServiceWorkerEvents.h
new file mode 100644
index 0000000000..2003c8afe9
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerEvents.h
@@ -0,0 +1,309 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerevents_h__
+#define mozilla_dom_serviceworkerevents_h__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/ExtendableEventBinding.h"
+#include "mozilla/dom/ExtendableMessageEventBinding.h"
+#include "mozilla/dom/FetchEventBinding.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/Response.h"
+#include "mozilla/dom/WorkerCommon.h"
+
+#include "nsProxyRelease.h"
+#include "nsContentUtils.h"
+
+class nsIInterceptedChannel;
+
+namespace mozilla::dom {
+
+class Blob;
+class Client;
+class FetchEventOp;
+class MessagePort;
+struct PushEventInit;
+class Request;
+class ResponseOrPromise;
+class ServiceWorker;
+class ServiceWorkerRegistrationInfo;
+
+// Defined in ServiceWorker.cpp
+bool ServiceWorkerVisible(JSContext* aCx, JSObject* aObj);
+
+class CancelChannelRunnable final : public Runnable {
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  const nsresult mStatus;
+
+ public:
+  CancelChannelRunnable(
+      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+      nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      nsresult aStatus);
+
+  NS_IMETHOD Run() override;
+};
+
+enum ExtendableEventResult { Rejected = 0, Resolved };
+
+class ExtendableEventCallback {
+ public:
+  virtual void FinishedWithResult(ExtendableEventResult aResult) = 0;
+
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+};
+
+class ExtendableEvent : public Event {
+ public:
+  class ExtensionsHandler {
+    friend class ExtendableEvent;
+
+   public:
+    virtual bool WaitOnPromise(Promise& aPromise) = 0;
+
+    NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+
+   protected:
+    virtual ~ExtensionsHandler();
+
+    // Also returns false if the owning ExtendableEvent is destroyed.
+    bool GetDispatchFlag() const;
+
+   private:
+    // Only the owning ExtendableEvent is allowed to set this data.
+    void SetExtendableEvent(const ExtendableEvent* const aExtendableEvent);
+
+    MOZ_NON_OWNING_REF const ExtendableEvent* mExtendableEvent = nullptr;
+  };
+
+ private:
+  RefPtr<ExtensionsHandler> mExtensionsHandler;
+
+ protected:
+  bool GetDispatchFlag() const { return mEvent->mFlags.mIsBeingDispatched; }
+
+  bool WaitOnPromise(Promise& aPromise);
+
+  explicit ExtendableEvent(mozilla::dom::EventTarget* aOwner);
+
+  ~ExtendableEvent() {
+    if (mExtensionsHandler) {
+      mExtensionsHandler->SetExtendableEvent(nullptr);
+    }
+  };
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  void SetKeepAliveHandler(ExtensionsHandler* aExtensionsHandler);
+
+  virtual JSObject* WrapObjectInternal(
+      JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
+    return mozilla::dom::ExtendableEvent_Binding::Wrap(aCx, this, aGivenProto);
+  }
+
+  static already_AddRefed<ExtendableEvent> Constructor(
+      mozilla::dom::EventTarget* aOwner, const nsAString& aType,
+      const EventInit& aOptions) {
+    RefPtr<ExtendableEvent> e = new ExtendableEvent(aOwner);
+    bool trusted = e->Init(aOwner);
+    e->InitEvent(aType, aOptions.mBubbles, aOptions.mCancelable);
+    e->SetTrusted(trusted);
+    e->SetComposed(aOptions.mComposed);
+    return e.forget();
+  }
+
+  static already_AddRefed<ExtendableEvent> Constructor(
+      const GlobalObject& aGlobal, const nsAString& aType,
+      const EventInit& aOptions) {
+    nsCOMPtr<EventTarget> target = do_QueryInterface(aGlobal.GetAsSupports());
+    return Constructor(target, aType, aOptions);
+  }
+
+  void WaitUntil(JSContext* aCx, Promise& aPromise, ErrorResult& aRv);
+
+  virtual ExtendableEvent* AsExtendableEvent() override { return this; }
+};
+
+class FetchEvent final : public ExtendableEvent {
+  RefPtr<FetchEventOp> mRespondWithHandler;
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  RefPtr<Request> mRequest;
+  RefPtr<Promise> mHandled;
+  RefPtr<Promise> mPreloadResponse;
+  nsCString mScriptSpec;
+  nsCString mPreventDefaultScriptSpec;
+  nsString mClientId;
+  nsString mResultingClientId;
+  uint32_t mPreventDefaultLineNumber;
+  uint32_t mPreventDefaultColumnNumber;
+  bool mWaitToRespond;
+
+ protected:
+  explicit FetchEvent(EventTarget* aOwner);
+  ~FetchEvent();
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FetchEvent, ExtendableEvent)
+
+  virtual JSObject* WrapObjectInternal(
+      JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
+    return FetchEvent_Binding::Wrap(aCx, this, aGivenProto);
+  }
+
+  void PostInit(
+      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
+      nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      const nsACString& aScriptSpec);
+
+  void PostInit(const nsACString& aScriptSpec,
+                RefPtr<FetchEventOp> aRespondWithHandler);
+
+  static already_AddRefed<FetchEvent> Constructor(
+      const GlobalObject& aGlobal, const nsAString& aType,
+      const FetchEventInit& aOptions);
+
+  bool WaitToRespond() const { return mWaitToRespond; }
+
+  Request* Request_() const {
+    MOZ_ASSERT(mRequest);
+    return mRequest;
+  }
+
+  void GetClientId(nsAString& aClientId) const { aClientId = mClientId; }
+
+  void GetResultingClientId(nsAString& aResultingClientId) const {
+    aResultingClientId = mResultingClientId;
+  }
+
+  Promise* Handled() const { return mHandled; }
+
+  Promise* PreloadResponse() const { return mPreloadResponse; }
+
+  void RespondWith(JSContext* aCx, Promise& aArg, ErrorResult& aRv);
+
+  // Pull in the Event version of PreventDefault so we don't get
+  // shadowing warnings.
+  using Event::PreventDefault;
+  void PreventDefault(JSContext* aCx, CallerType aCallerType) override;
+
+  void ReportCanceled();
+};
+
+class PushMessageData final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(PushMessageData)
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  nsIGlobalObject* GetParentObject() const { return mOwner; }
+
+  void Json(JSContext* cx, JS::MutableHandle<JS::Value> aRetval,
+            ErrorResult& aRv);
+  void Text(nsAString& aData);
+  void ArrayBuffer(JSContext* cx, JS::MutableHandle<JSObject*> aRetval,
+                   ErrorResult& aRv);
+  already_AddRefed<mozilla::dom::Blob> Blob(ErrorResult& aRv);
+
+  PushMessageData(nsIGlobalObject* aOwner, nsTArray<uint8_t>&& aBytes);
+
+ private:
+  nsCOMPtr<nsIGlobalObject> mOwner;
+  nsTArray<uint8_t> mBytes;
+  nsString mDecodedText;
+  ~PushMessageData();
+
+  nsresult EnsureDecodedText();
+  uint8_t* GetContentsCopy();
+};
+
+class PushEvent final : public ExtendableEvent {
+  RefPtr<PushMessageData> mData;
+
+ protected:
+  explicit PushEvent(mozilla::dom::EventTarget* aOwner);
+  ~PushEvent() = default;
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PushEvent, ExtendableEvent)
+
+  virtual JSObject* WrapObjectInternal(
+      JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<PushEvent> Constructor(
+      mozilla::dom::EventTarget* aOwner, const nsAString& aType,
+      const PushEventInit& aOptions, ErrorResult& aRv);
+
+  static already_AddRefed<PushEvent> Constructor(const GlobalObject& aGlobal,
+                                                 const nsAString& aType,
+                                                 const PushEventInit& aOptions,
+                                                 ErrorResult& aRv) {
+    nsCOMPtr<EventTarget> owner = do_QueryInterface(aGlobal.GetAsSupports());
+    return Constructor(owner, aType, aOptions, aRv);
+  }
+
+  PushMessageData* GetData() const { return mData; }
+};
+
+class ExtendableMessageEvent final : public ExtendableEvent {
+  JS::Heap<JS::Value> mData;
+  nsString mOrigin;
+  nsString mLastEventId;
+  RefPtr<Client> mClient;
+  RefPtr<ServiceWorker> mServiceWorker;
+  RefPtr<MessagePort> mMessagePort;
+  nsTArray<RefPtr<MessagePort>> mPorts;
+
+ protected:
+  explicit ExtendableMessageEvent(EventTarget* aOwner);
+  ~ExtendableMessageEvent();
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(ExtendableMessageEvent,
+                                                         ExtendableEvent)
+
+  virtual JSObject* WrapObjectInternal(
+      JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
+    return mozilla::dom::ExtendableMessageEvent_Binding::Wrap(aCx, this,
+                                                              aGivenProto);
+  }
+
+  static already_AddRefed<ExtendableMessageEvent> Constructor(
+      mozilla::dom::EventTarget* aOwner, const nsAString& aType,
+      const ExtendableMessageEventInit& aOptions);
+
+  static already_AddRefed<ExtendableMessageEvent> Constructor(
+      const GlobalObject& aGlobal, const nsAString& aType,
+      const ExtendableMessageEventInit& aOptions);
+
+  void GetData(JSContext* aCx, JS::MutableHandle<JS::Value> aData,
+               ErrorResult& aRv);
+
+  void GetSource(
+      Nullable<OwningClientOrServiceWorkerOrMessagePort>& aValue) const;
+
+  void GetOrigin(nsAString& aOrigin) const { aOrigin = mOrigin; }
+
+  void GetLastEventId(nsAString& aLastEventId) const {
+    aLastEventId = mLastEventId;
+  }
+
+  void GetPorts(nsTArray<RefPtr<MessagePort>>& aPorts);
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_serviceworkerevents_h__ */
diff --git a/dom/serviceworkers/ServiceWorkerIPCUtils.h b/dom/serviceworkers/ServiceWorkerIPCUtils.h
new file mode 100644
index 0000000000..bd867f877a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerIPCUtils.h
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _mozilla_dom_ServiceWorkerIPCUtils_h
+#define _mozilla_dom_ServiceWorkerIPCUtils_h
+
+#include "ipc/EnumSerializer.h"
+
+// Undo X11/X.h's definition of None
+#undef None
+
+#include "mozilla/dom/ServiceWorkerBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrationBinding.h"
+
+namespace IPC {
+
+template <>
+struct ParamTraits<mozilla::dom::ServiceWorkerState>
+    : public ContiguousEnumSerializer<
+          mozilla::dom::ServiceWorkerState,
+          mozilla::dom::ServiceWorkerState::Parsed,
+          mozilla::dom::ServiceWorkerState::EndGuard_> {};
+
+template <>
+struct ParamTraits<mozilla::dom::ServiceWorkerUpdateViaCache>
+    : public ContiguousEnumSerializer<
+          mozilla::dom::ServiceWorkerUpdateViaCache,
+          mozilla::dom::ServiceWorkerUpdateViaCache::Imports,
+          mozilla::dom::ServiceWorkerUpdateViaCache::EndGuard_> {};
+
+}  // namespace IPC
+
+#endif  // _mozilla_dom_ServiceWorkerIPCUtils_h
diff --git a/dom/serviceworkers/ServiceWorkerInfo.cpp b/dom/serviceworkers/ServiceWorkerInfo.cpp
new file mode 100644
index 0000000000..9998cfed6b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerInfo.cpp
@@ -0,0 +1,286 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerInfo.h"
+
+#include "ServiceWorkerUtils.h"
+#include "ServiceWorkerPrivate.h"
+#include "ServiceWorkerScriptCache.h"
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/ClientState.h"
+#include "mozilla/dom/RemoteWorkerTypes.h"
+#include "mozilla/dom/WorkerPrivate.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::PrincipalInfo;
+
+static_assert(nsIServiceWorkerInfo::STATE_PARSED ==
+                  static_cast<uint16_t>(ServiceWorkerState::Parsed),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_INSTALLING ==
+                  static_cast<uint16_t>(ServiceWorkerState::Installing),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_INSTALLED ==
+                  static_cast<uint16_t>(ServiceWorkerState::Installed),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_ACTIVATING ==
+                  static_cast<uint16_t>(ServiceWorkerState::Activating),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_ACTIVATED ==
+                  static_cast<uint16_t>(ServiceWorkerState::Activated),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_REDUNDANT ==
+                  static_cast<uint16_t>(ServiceWorkerState::Redundant),
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+static_assert(nsIServiceWorkerInfo::STATE_UNKNOWN ==
+                  ServiceWorkerStateValues::Count,
+              "ServiceWorkerState enumeration value should match state values "
+              "from nsIServiceWorkerInfo.");
+
+NS_IMPL_ISUPPORTS(ServiceWorkerInfo, nsIServiceWorkerInfo)
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetId(nsAString& aId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  aId = mWorkerPrivateId;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetScriptSpec(nsAString& aScriptSpec) {
+  MOZ_ASSERT(NS_IsMainThread());
+  CopyUTF8toUTF16(mDescriptor.ScriptURL(), aScriptSpec);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetCacheName(nsAString& aCacheName) {
+  MOZ_ASSERT(NS_IsMainThread());
+  aCacheName = mCacheName;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetState(uint16_t* aState) {
+  MOZ_ASSERT(aState);
+  MOZ_ASSERT(NS_IsMainThread());
+  *aState = static_cast<uint16_t>(State());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetDebugger(nsIWorkerDebugger** aResult) {
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return mServiceWorkerPrivate->GetDebugger(aResult);
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetHandlesFetchEvents(bool* aValue) {
+  MOZ_ASSERT(aValue);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mHandlesFetch == Unknown) {
+    return NS_ERROR_FAILURE;
+  }
+
+  *aValue = HandlesFetch();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetInstalledTime(PRTime* _retval) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(_retval);
+  *_retval = mInstalledTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetActivatedTime(PRTime* _retval) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(_retval);
+  *_retval = mActivatedTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetRedundantTime(PRTime* _retval) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(_retval);
+  *_retval = mRedundantTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetNavigationFaultCount(uint32_t* aNavigationFaultCount) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aNavigationFaultCount);
+  *aNavigationFaultCount = mNavigationFaultCount;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::GetTestingInjectCancellation(
+    nsresult* aTestingInjectCancellation) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aTestingInjectCancellation);
+  *aTestingInjectCancellation = mTestingInjectCancellation;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::SetTestingInjectCancellation(
+    nsresult aTestingInjectCancellation) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mTestingInjectCancellation = aTestingInjectCancellation;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::AttachDebugger() {
+  return mServiceWorkerPrivate->AttachDebugger();
+}
+
+NS_IMETHODIMP
+ServiceWorkerInfo::DetachDebugger() {
+  return mServiceWorkerPrivate->DetachDebugger();
+}
+
+void ServiceWorkerInfo::UpdateState(ServiceWorkerState aState) {
+  MOZ_ASSERT(NS_IsMainThread());
+#ifdef DEBUG
+  // Any state can directly transition to redundant, but everything else is
+  // ordered.
+  if (aState != ServiceWorkerState::Redundant) {
+    MOZ_ASSERT_IF(State() == ServiceWorkerState::EndGuard_,
+                  aState == ServiceWorkerState::Installing);
+    MOZ_ASSERT_IF(State() == ServiceWorkerState::Installing,
+                  aState == ServiceWorkerState::Installed);
+    MOZ_ASSERT_IF(State() == ServiceWorkerState::Installed,
+                  aState == ServiceWorkerState::Activating);
+    MOZ_ASSERT_IF(State() == ServiceWorkerState::Activating,
+                  aState == ServiceWorkerState::Activated);
+  }
+  // Activated can only go to redundant.
+  MOZ_ASSERT_IF(State() == ServiceWorkerState::Activated,
+                aState == ServiceWorkerState::Redundant);
+#endif
+  // Flush any pending functional events to the worker when it transitions to
+  // the activated state.
+  // TODO: Do we care that these events will race with the propagation of the
+  //       state change?
+  if (State() != aState) {
+    mServiceWorkerPrivate->UpdateState(aState);
+  }
+  mDescriptor.SetState(aState);
+  if (State() == ServiceWorkerState::Redundant) {
+    serviceWorkerScriptCache::PurgeCache(mPrincipal, mCacheName);
+    mServiceWorkerPrivate->NoteDeadServiceWorkerInfo();
+  }
+}
+
+ServiceWorkerInfo::ServiceWorkerInfo(nsIPrincipal* aPrincipal,
+                                     const nsACString& aScope,
+                                     uint64_t aRegistrationId,
+                                     uint64_t aRegistrationVersion,
+                                     const nsACString& aScriptSpec,
+                                     const nsAString& aCacheName,
+                                     nsLoadFlags aImportsLoadFlags)
+    : mPrincipal(aPrincipal),
+      mDescriptor(GetNextID(), aRegistrationId, aRegistrationVersion,
+                  aPrincipal, aScope, aScriptSpec, ServiceWorkerState::Parsed),
+      mCacheName(aCacheName),
+      mWorkerPrivateId(ComputeWorkerPrivateId()),
+      mImportsLoadFlags(aImportsLoadFlags),
+      mCreationTime(PR_Now()),
+      mCreationTimeStamp(TimeStamp::Now()),
+      mInstalledTime(0),
+      mActivatedTime(0),
+      mRedundantTime(0),
+      mServiceWorkerPrivate(new ServiceWorkerPrivate(this)),
+      mSkipWaitingFlag(false),
+      mHandlesFetch(Unknown),
+      mNavigationFaultCount(0),
+      mTestingInjectCancellation(NS_OK) {
+  MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
+  MOZ_ASSERT(mPrincipal);
+  // cache origin attributes so we can use them off main thread
+  mOriginAttributes = mPrincipal->OriginAttributesRef();
+  MOZ_ASSERT(!mDescriptor.ScriptURL().IsEmpty());
+  MOZ_ASSERT(!mCacheName.IsEmpty());
+  MOZ_ASSERT(!mWorkerPrivateId.IsEmpty());
+
+  // Scripts of a service worker should always be loaded bypass service workers.
+  // Otherwise, we might not be able to update a service worker correctly, if
+  // there is a service worker generating the script.
+  MOZ_DIAGNOSTIC_ASSERT(mImportsLoadFlags &
+                        nsIChannel::LOAD_BYPASS_SERVICE_WORKER);
+}
+
+ServiceWorkerInfo::~ServiceWorkerInfo() {
+  MOZ_ASSERT(mServiceWorkerPrivate);
+  mServiceWorkerPrivate->NoteDeadServiceWorkerInfo();
+}
+
+static uint64_t gServiceWorkerInfoCurrentID = 0;
+
+uint64_t ServiceWorkerInfo::GetNextID() const {
+  return ++gServiceWorkerInfoCurrentID;
+}
+
+void ServiceWorkerInfo::PostMessage(RefPtr<ServiceWorkerCloneData>&& aData,
+                                    const ClientInfo& aClientInfo,
+                                    const ClientState& aClientState) {
+  mServiceWorkerPrivate->SendMessageEvent(
+      std::move(aData),
+      ClientInfoAndState(aClientInfo.ToIPC(), aClientState.ToIPC()));
+}
+
+void ServiceWorkerInfo::UpdateInstalledTime() {
+  MOZ_ASSERT(State() == ServiceWorkerState::Installed);
+  MOZ_ASSERT(mInstalledTime == 0);
+
+  mInstalledTime =
+      mCreationTime +
+      static_cast<PRTime>(
+          (TimeStamp::Now() - mCreationTimeStamp).ToMicroseconds());
+}
+
+void ServiceWorkerInfo::UpdateActivatedTime() {
+  MOZ_ASSERT(State() == ServiceWorkerState::Activated);
+  MOZ_ASSERT(mActivatedTime == 0);
+
+  mActivatedTime =
+      mCreationTime +
+      static_cast<PRTime>(
+          (TimeStamp::Now() - mCreationTimeStamp).ToMicroseconds());
+}
+
+void ServiceWorkerInfo::UpdateRedundantTime() {
+  MOZ_ASSERT(State() == ServiceWorkerState::Redundant);
+  MOZ_ASSERT(mRedundantTime == 0);
+
+  mRedundantTime =
+      mCreationTime +
+      static_cast<PRTime>(
+          (TimeStamp::Now() - mCreationTimeStamp).ToMicroseconds());
+}
+
+void ServiceWorkerInfo::SetRegistrationVersion(uint64_t aVersion) {
+  mDescriptor.SetRegistrationVersion(aVersion);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerInfo.h b/dom/serviceworkers/ServiceWorkerInfo.h
new file mode 100644
index 0000000000..03a9eb6aff
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerInfo.h
@@ -0,0 +1,183 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerinfo_h
+#define mozilla_dom_serviceworkerinfo_h
+
+#include "MainThreadUtils.h"
+#include "mozilla/dom/ServiceWorkerBinding.h"  // For ServiceWorkerState
+#include "mozilla/dom/ServiceWorkerDescriptor.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/OriginAttributes.h"
+#include "mozilla/TimeStamp.h"
+#include "nsIServiceWorkerManager.h"
+
+namespace mozilla::dom {
+
+class ClientInfoAndState;
+class ClientState;
+class ServiceWorkerCloneData;
+class ServiceWorkerPrivate;
+
+/*
+ * Wherever the spec treats a worker instance and a description of said worker
+ * as the same thing; i.e. "Resolve foo with
+ * _GetNewestWorker(serviceWorkerRegistration)", we represent the description
+ * by this class and spawn a ServiceWorker in the right global when required.
+ */
+class ServiceWorkerInfo final : public nsIServiceWorkerInfo {
+ private:
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  ServiceWorkerDescriptor mDescriptor;
+  const nsString mCacheName;
+  OriginAttributes mOriginAttributes;
+  const nsString mWorkerPrivateId;
+
+  // This LoadFlags is only applied to imported scripts, since the main script
+  // has already been downloaded when performing the bytecheck. This LoadFlag is
+  // composed of three parts:
+  //   1. nsIChannel::LOAD_BYPASS_SERVICE_WORKER
+  //   2. (Optional) nsIRequest::VALIDATE_ALWAYS
+  //      depends on ServiceWorkerUpdateViaCache of its registration.
+  //   3. (optional) nsIRequest::LOAD_BYPASS_CACHE
+  //      depends on whether the update timer is expired.
+  const nsLoadFlags mImportsLoadFlags;
+
+  // Timestamp to track SW's state
+  PRTime mCreationTime;
+  TimeStamp mCreationTimeStamp;
+
+  // The time of states are 0, if SW has not reached that state yet. Besides, we
+  // update each of them after UpdateState() is called in SWRegistrationInfo.
+  PRTime mInstalledTime;
+  PRTime mActivatedTime;
+  PRTime mRedundantTime;
+
+  RefPtr<ServiceWorkerPrivate> mServiceWorkerPrivate;
+  bool mSkipWaitingFlag;
+
+  enum { Unknown, Enabled, Disabled } mHandlesFetch;
+
+  uint32_t mNavigationFaultCount;
+
+  // Testing helper to trigger fetch event cancellation when not NS_OK.
+  // See `nsIServiceWorkerInfo::testingInjectCancellation`.
+  nsresult mTestingInjectCancellation;
+
+  ~ServiceWorkerInfo();
+
+  // Generates a unique id for the service worker, with zero being treated as
+  // invalid.
+  uint64_t GetNextID() const;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISERVICEWORKERINFO
+
+  void PostMessage(RefPtr<ServiceWorkerCloneData>&& aData,
+                   const ClientInfo& aClientInfo,
+                   const ClientState& aClientState);
+
+  class ServiceWorkerPrivate* WorkerPrivate() const {
+    MOZ_ASSERT(mServiceWorkerPrivate);
+    return mServiceWorkerPrivate;
+  }
+
+  nsIPrincipal* Principal() const { return mPrincipal; }
+
+  const nsCString& ScriptSpec() const { return mDescriptor.ScriptURL(); }
+
+  const nsCString& Scope() const { return mDescriptor.Scope(); }
+
+  bool SkipWaitingFlag() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mSkipWaitingFlag;
+  }
+
+  void SetSkipWaitingFlag() {
+    MOZ_ASSERT(NS_IsMainThread());
+    mSkipWaitingFlag = true;
+  }
+
+  void ReportNavigationFault() {
+    MOZ_ASSERT(NS_IsMainThread());
+    mNavigationFaultCount++;
+  }
+
+  ServiceWorkerInfo(nsIPrincipal* aPrincipal, const nsACString& aScope,
+                    uint64_t aRegistrationId, uint64_t aRegistrationVersion,
+                    const nsACString& aScriptSpec, const nsAString& aCacheName,
+                    nsLoadFlags aLoadFlags);
+
+  ServiceWorkerState State() const { return mDescriptor.State(); }
+
+  const OriginAttributes& GetOriginAttributes() const {
+    return mOriginAttributes;
+  }
+
+  const nsString& CacheName() const { return mCacheName; }
+
+  nsLoadFlags GetImportsLoadFlags() const { return mImportsLoadFlags; }
+
+  uint64_t ID() const { return mDescriptor.Id(); }
+
+  const ServiceWorkerDescriptor& Descriptor() const { return mDescriptor; }
+
+  nsresult TestingInjectCancellation() { return mTestingInjectCancellation; }
+
+  void UpdateState(ServiceWorkerState aState);
+
+  // Only used to set initial state when loading from disk!
+  void SetActivateStateUncheckedWithoutEvent(ServiceWorkerState aState) {
+    MOZ_ASSERT(NS_IsMainThread());
+    mDescriptor.SetState(aState);
+  }
+
+  void SetHandlesFetch(bool aHandlesFetch) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_DIAGNOSTIC_ASSERT(mHandlesFetch == Unknown);
+    mHandlesFetch = aHandlesFetch ? Enabled : Disabled;
+    mDescriptor.SetHandlesFetch(aHandlesFetch);
+  }
+
+  void SetRegistrationVersion(uint64_t aVersion);
+
+  bool HandlesFetch() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_DIAGNOSTIC_ASSERT(mHandlesFetch != Unknown);
+    return mHandlesFetch != Disabled;
+  }
+
+  void UpdateInstalledTime();
+
+  void UpdateActivatedTime();
+
+  void UpdateRedundantTime();
+
+  int64_t GetInstalledTime() const { return mInstalledTime; }
+
+  void SetInstalledTime(const int64_t aTime) {
+    if (aTime == 0) {
+      return;
+    }
+
+    mInstalledTime = aTime;
+  }
+
+  int64_t GetActivatedTime() const { return mActivatedTime; }
+
+  void SetActivatedTime(const int64_t aTime) {
+    if (aTime == 0) {
+      return;
+    }
+
+    mActivatedTime = aTime;
+  }
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerinfo_h
diff --git a/dom/serviceworkers/ServiceWorkerInterceptController.cpp b/dom/serviceworkers/ServiceWorkerInterceptController.cpp
new file mode 100644
index 0000000000..87fdf82af7
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerInterceptController.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerInterceptController.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/StorageAccess.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "mozilla/dom/InternalRequest.h"
+#include "mozilla/net/HttpBaseChannel.h"
+#include "nsCOMPtr.h"
+#include "nsContentUtils.h"
+#include "nsIChannel.h"
+#include "nsICookieJarSettings.h"
+#include "ServiceWorkerManager.h"
+#include "nsIPrincipal.h"
+#include "nsQueryObject.h"
+
+namespace mozilla::dom {
+
+namespace {
+bool IsWithinObjectOrEmbed(const nsCOMPtr<nsILoadInfo>& loadInfo) {
+  RefPtr<BrowsingContext> browsingContext;
+  loadInfo->GetTargetBrowsingContext(getter_AddRefs(browsingContext));
+
+  for (BrowsingContext* cur = browsingContext.get(); cur;
+       cur = cur->GetParent()) {
+    if (cur->IsEmbedderTypeObjectOrEmbed()) {
+      return true;
+    }
+  }
+
+  return false;
+}
+}  // namespace
+
+NS_IMPL_ISUPPORTS(ServiceWorkerInterceptController,
+                  nsINetworkInterceptController)
+
+NS_IMETHODIMP
+ServiceWorkerInterceptController::ShouldPrepareForIntercept(
+    nsIURI* aURI, nsIChannel* aChannel, bool* aShouldIntercept) {
+  *aShouldIntercept = false;
+
+  nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
+
+  // Block interception if the request's destination is within an object or
+  // embed element.
+  if (IsWithinObjectOrEmbed(loadInfo)) {
+    return NS_OK;
+  }
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+  // For subresource requests we base our decision solely on the client's
+  // controller value.  Any settings that would have blocked service worker
+  // access should have been set before the initial navigation created the
+  // window.
+  if (!nsContentUtils::IsNonSubresourceRequest(aChannel)) {
+    const Maybe<ServiceWorkerDescriptor>& controller =
+        loadInfo->GetController();
+
+    // If the controller doesn't handle fetch events, return false
+    if (!controller.isSome()) {
+      return NS_OK;
+    }
+
+    *aShouldIntercept = controller.ref().HandlesFetch();
+
+    // The service worker has no fetch event handler, try to schedule a
+    // soft-update through ServiceWorkerRegistrationInfo.
+    // Get ServiceWorkerRegistrationInfo by the ServiceWorkerInfo's principal
+    // and scope
+    if (!*aShouldIntercept && swm) {
+      nsCOMPtr<nsIPrincipal> principal =
+          controller.ref().GetPrincipal().unwrap();
+      RefPtr<ServiceWorkerRegistrationInfo> registration =
+          swm->GetRegistration(principal, controller.ref().Scope());
+      // Could not get ServiceWorkerRegistration here if unregister is
+      // executed before getting here.
+      if (NS_WARN_IF(!registration)) {
+        return NS_OK;
+      }
+      registration->MaybeScheduleTimeCheckAndUpdate();
+    }
+
+    RefPtr<net::HttpBaseChannel> httpChannel = do_QueryObject(aChannel);
+
+    if (httpChannel &&
+        httpChannel->GetRequestHead()->HasHeader(net::nsHttp::Range)) {
+      RequestMode requestMode =
+          InternalRequest::MapChannelToRequestMode(aChannel);
+      bool mayLoad = nsContentUtils::CheckMayLoad(
+          loadInfo->GetLoadingPrincipal(), aChannel,
+          /*allowIfInheritsPrincipal*/ false);
+      if (requestMode == RequestMode::No_cors && !mayLoad) {
+        *aShouldIntercept = false;
+      }
+    }
+
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv = StoragePrincipalHelper::GetPrincipal(
+      aChannel,
+      StaticPrefs::privacy_partition_serviceWorkers()
+          ? StoragePrincipalHelper::eForeignPartitionedPrincipal
+          : StoragePrincipalHelper::eRegularPrincipal,
+      getter_AddRefs(principal));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // First check with the ServiceWorkerManager for a matching service worker.
+  if (!swm || !swm->IsAvailable(principal, aURI, aChannel)) {
+    return NS_OK;
+  }
+
+  // Check if we're in a secure context, unless service worker testing is
+  // enabled.
+  if (!nsContentUtils::ComputeIsSecureContext(aChannel) &&
+      !StaticPrefs::dom_serviceWorkers_testing_enabled()) {
+    return NS_OK;
+  }
+
+  // Then check to see if we are allowed to control the window.
+  // It is important to check for the availability of the service worker first
+  // to avoid showing warnings about the use of third-party cookies in the UI
+  // unnecessarily when no service worker is being accessed.
+  auto storageAccess = StorageAllowedForChannel(aChannel);
+  if (storageAccess != StorageAccess::eAllow) {
+    if (!StaticPrefs::privacy_partition_serviceWorkers()) {
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
+    loadInfo->GetCookieJarSettings(getter_AddRefs(cookieJarSettings));
+
+    if (!StoragePartitioningEnabled(storageAccess, cookieJarSettings)) {
+      return NS_OK;
+    }
+  }
+
+  *aShouldIntercept = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerInterceptController::ChannelIntercepted(
+    nsIInterceptedChannel* aChannel) {
+  // Note, do not cancel the interception here.  The caller will try to
+  // ResetInterception() on error.
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult error;
+  swm->DispatchFetchEvent(aChannel, error);
+  if (NS_WARN_IF(error.Failed())) {
+    return error.StealNSResult();
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerInterceptController.h b/dom/serviceworkers/ServiceWorkerInterceptController.h
new file mode 100644
index 0000000000..32113291ef
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerInterceptController.h
@@ -0,0 +1,25 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerinterceptcontroller_h
+#define mozilla_dom_serviceworkerinterceptcontroller_h
+
+#include "nsINetworkInterceptController.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerInterceptController final
+    : public nsINetworkInterceptController {
+  ~ServiceWorkerInterceptController() = default;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSINETWORKINTERCEPTCONTROLLER
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerinterceptcontroller_h
diff --git a/dom/serviceworkers/ServiceWorkerJob.cpp b/dom/serviceworkers/ServiceWorkerJob.cpp
new file mode 100644
index 0000000000..980d48b66c
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerJob.cpp
@@ -0,0 +1,220 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerJob.h"
+
+#include "mozilla/dom/WorkerCommon.h"
+#include "nsIPrincipal.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+#include "ServiceWorkerManager.h"
+
+namespace mozilla::dom {
+
+ServiceWorkerJob::Type ServiceWorkerJob::GetType() const { return mType; }
+
+ServiceWorkerJob::State ServiceWorkerJob::GetState() const { return mState; }
+
+bool ServiceWorkerJob::Canceled() const { return mCanceled; }
+
+bool ServiceWorkerJob::ResultCallbacksInvoked() const {
+  return mResultCallbacksInvoked;
+}
+
+bool ServiceWorkerJob::IsEquivalentTo(ServiceWorkerJob* aJob) const {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aJob);
+  return mType == aJob->mType && mScope.Equals(aJob->mScope) &&
+         mScriptSpec.Equals(aJob->mScriptSpec) &&
+         mPrincipal->Equals(aJob->mPrincipal);
+}
+
+void ServiceWorkerJob::AppendResultCallback(Callback* aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(mState != State::Finished);
+  MOZ_DIAGNOSTIC_ASSERT(aCallback);
+  MOZ_DIAGNOSTIC_ASSERT(mFinalCallback != aCallback);
+  MOZ_ASSERT(!mResultCallbackList.Contains(aCallback));
+  MOZ_DIAGNOSTIC_ASSERT(!mResultCallbacksInvoked);
+  mResultCallbackList.AppendElement(aCallback);
+}
+
+void ServiceWorkerJob::StealResultCallbacksFrom(ServiceWorkerJob* aJob) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aJob);
+  MOZ_ASSERT(aJob->mState == State::Initial);
+
+  // Take the callbacks from the other job immediately to avoid the
+  // any possibility of them existing on both jobs at once.
+  nsTArray<RefPtr<Callback>> callbackList =
+      std::move(aJob->mResultCallbackList);
+
+  for (RefPtr<Callback>& callback : callbackList) {
+    // Use AppendResultCallback() so that assertion checking is performed on
+    // each callback.
+    AppendResultCallback(callback);
+  }
+}
+
+void ServiceWorkerJob::Start(Callback* aFinalCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(!mCanceled);
+
+  MOZ_DIAGNOSTIC_ASSERT(aFinalCallback);
+  MOZ_DIAGNOSTIC_ASSERT(!mFinalCallback);
+  MOZ_ASSERT(!mResultCallbackList.Contains(aFinalCallback));
+  mFinalCallback = aFinalCallback;
+
+  MOZ_DIAGNOSTIC_ASSERT(mState == State::Initial);
+  mState = State::Started;
+
+  nsCOMPtr<nsIRunnable> runnable = NewRunnableMethod(
+      "ServiceWorkerJob::AsyncExecute", this, &ServiceWorkerJob::AsyncExecute);
+
+  // We may have to wait for the PBackground actor to be initialized
+  // before proceeding.  We should always be able to get a ServiceWorkerManager,
+  // however, since Start() should not be called during shutdown.
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // browser shutdown
+    return;
+  }
+
+  // Otherwise start asynchronously.  We should never run a job synchronously.
+  MOZ_ALWAYS_TRUE(NS_SUCCEEDED(NS_DispatchToMainThread(runnable.forget())));
+}
+
+void ServiceWorkerJob::Cancel() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mCanceled);
+  mCanceled = true;
+
+  if (GetState() != State::Started) {
+    MOZ_ASSERT(GetState() == State::Initial);
+
+    ErrorResult error(NS_ERROR_DOM_ABORT_ERR);
+    InvokeResultCallbacks(error);
+
+    // The callbacks might not consume the error, which is fine.
+    error.SuppressException();
+  }
+}
+
+ServiceWorkerJob::ServiceWorkerJob(Type aType, nsIPrincipal* aPrincipal,
+                                   const nsACString& aScope,
+                                   nsCString aScriptSpec)
+    : mType(aType),
+      mPrincipal(aPrincipal),
+      mScope(aScope),
+      mScriptSpec(std::move(aScriptSpec)),
+      mState(State::Initial),
+      mCanceled(false),
+      mResultCallbacksInvoked(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mPrincipal);
+  MOZ_ASSERT(!mScope.IsEmpty());
+
+  // Empty script URL if and only if this is an unregister job.
+  MOZ_ASSERT((mType == Type::Unregister) == mScriptSpec.IsEmpty());
+}
+
+ServiceWorkerJob::~ServiceWorkerJob() {
+  MOZ_ASSERT(NS_IsMainThread());
+  // Jobs must finish or never be started.  Destroying an actively running
+  // job is an error.
+  MOZ_ASSERT(mState != State::Started);
+  MOZ_ASSERT_IF(mState == State::Finished, mResultCallbacksInvoked);
+}
+
+void ServiceWorkerJob::InvokeResultCallbacks(ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(mState != State::Finished);
+  MOZ_DIAGNOSTIC_ASSERT_IF(mState == State::Initial, Canceled());
+
+  MOZ_DIAGNOSTIC_ASSERT(!mResultCallbacksInvoked);
+  mResultCallbacksInvoked = true;
+
+  nsTArray<RefPtr<Callback>> callbackList = std::move(mResultCallbackList);
+
+  for (RefPtr<Callback>& callback : callbackList) {
+    // The callback might consume an exception on the ErrorResult, so we need
+    // to clone in order to maintain the error for the next callback.
+    ErrorResult rv;
+    aRv.CloneTo(rv);
+
+    if (GetState() == State::Started) {
+      callback->JobFinished(this, rv);
+    } else {
+      callback->JobDiscarded(rv);
+    }
+
+    // The callback might not consume the error.
+    rv.SuppressException();
+  }
+}
+
+void ServiceWorkerJob::InvokeResultCallbacks(nsresult aRv) {
+  ErrorResult converted(aRv);
+  InvokeResultCallbacks(converted);
+}
+
+void ServiceWorkerJob::Finish(ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Avoid double-completion because it can result on operating on cleaned
+  // up data.  This should not happen, though, so also assert to try to
+  // narrow down the causes.
+  MOZ_DIAGNOSTIC_ASSERT(mState == State::Started);
+  if (mState != State::Started) {
+    return;
+  }
+
+  // Ensure that we only surface SecurityErr, TypeErr or InvalidStateErr to
+  // script.
+  if (aRv.Failed() && !aRv.ErrorCodeIs(NS_ERROR_DOM_SECURITY_ERR) &&
+      !aRv.ErrorCodeIs(NS_ERROR_INTERNAL_ERRORRESULT_TYPEERROR) &&
+      !aRv.ErrorCodeIs(NS_ERROR_DOM_INVALID_STATE_ERR)) {
+    // Remove the old error code so we can replace it with a TypeError.
+    aRv.SuppressException();
+
+    // Throw the type error with a generic error message.  We use a stack
+    // reference to bypass the normal static analysis for "return right after
+    // throwing", since it's not the right check here: this ErrorResult came in
+    // pre-thrown.
+    ErrorResult& rv = aRv;
+    rv.ThrowTypeError<MSG_SW_INSTALL_ERROR>(mScriptSpec, mScope);
+  }
+
+  // The final callback may drop the last ref to this object.
+  RefPtr<ServiceWorkerJob> kungFuDeathGrip = this;
+
+  if (!mResultCallbacksInvoked) {
+    InvokeResultCallbacks(aRv);
+  }
+
+  mState = State::Finished;
+
+  MOZ_DIAGNOSTIC_ASSERT(mFinalCallback);
+  if (mFinalCallback) {
+    mFinalCallback->JobFinished(this, aRv);
+    mFinalCallback = nullptr;
+  }
+
+  // The callback might not consume the error.
+  aRv.SuppressException();
+
+  // Async release this object to ensure that our caller methods complete
+  // as well.
+  NS_ReleaseOnMainThread("ServiceWorkerJobProxyRunnable",
+                         kungFuDeathGrip.forget(), true /* always proxy */);
+}
+
+void ServiceWorkerJob::Finish(nsresult aRv) {
+  ErrorResult converted(aRv);
+  Finish(converted);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerJob.h b/dom/serviceworkers/ServiceWorkerJob.h
new file mode 100644
index 0000000000..70eed04636
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerJob.h
@@ -0,0 +1,126 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerjob_h
+#define mozilla_dom_serviceworkerjob_h
+
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+class nsIPrincipal;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class ServiceWorkerJob {
+ public:
+  // Implement this interface to receive notification when a job completes or
+  // is discarded.
+  class Callback {
+   public:
+    // Called once when the job completes.  If the job is started, then this
+    // will be called.  If a job is never executed due to browser shutdown,
+    // then this method will never be called.  This method is always called
+    // on the main thread asynchronously after Start() completes.
+    virtual void JobFinished(ServiceWorkerJob* aJob, ErrorResult& aStatus) = 0;
+
+    // If the job has not started and will never start, then this will be
+    // called; either JobFinished or JobDiscarded will be called, but not both.
+    virtual void JobDiscarded(ErrorResult& aStatus) = 0;
+
+    NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+  };
+
+  enum class Type { Register, Update, Unregister };
+
+  enum class State { Initial, Started, Finished };
+
+  Type GetType() const;
+
+  State GetState() const;
+
+  // Determine if the job has been canceled.  This does not change the
+  // current State, but indicates that the job should progress to Finished
+  // as soon as possible.
+  bool Canceled() const;
+
+  // Determine if the result callbacks have already been called.  This is
+  // equivalent to the spec checked to see if the job promise has settled.
+  bool ResultCallbacksInvoked() const;
+
+  bool IsEquivalentTo(ServiceWorkerJob* aJob) const;
+
+  // Add a callback that will be invoked when the job's result is available.
+  // Some job types will invoke this before the job is actually finished.
+  // If an early callback does not occur, then it will be called automatically
+  // when Finish() is called.  These callbacks will be invoked while the job
+  // state is Started.
+  void AppendResultCallback(Callback* aCallback);
+
+  // This takes ownership of any result callbacks associated with the given job
+  // and then appends them to this job's callback list.
+  void StealResultCallbacksFrom(ServiceWorkerJob* aJob);
+
+  // Start the job.  All work will be performed asynchronously on
+  // the main thread.  The Finish() method must be called exactly
+  // once after this point.  A final callback must be provided.  It
+  // will be invoked after all other callbacks have been processed.
+  void Start(Callback* aFinalCallback);
+
+  // Set an internal flag indicating that a started job should finish as
+  // soon as possible.
+  void Cancel();
+
+ protected:
+  ServiceWorkerJob(Type aType, nsIPrincipal* aPrincipal,
+                   const nsACString& aScope, nsCString aScriptSpec);
+
+  virtual ~ServiceWorkerJob();
+
+  // Invoke the result callbacks immediately.  The job must be in the
+  // Started state or be canceled and in the Initial state.  The callbacks are
+  // cleared after being invoked, so subsequent method calls have no effect.
+  void InvokeResultCallbacks(ErrorResult& aRv);
+
+  // Convenience method that converts to ErrorResult and calls real method.
+  void InvokeResultCallbacks(nsresult aRv);
+
+  // Indicate that the job has completed.  The must be called exactly
+  // once after Start() has initiated job execution.  It may not be
+  // called until Start() has returned.
+  void Finish(ErrorResult& aRv);
+
+  // Convenience method that converts to ErrorResult and calls real method.
+  void Finish(nsresult aRv);
+
+  // Specific job types should define AsyncExecute to begin their work.
+  // All errors and successes must result in Finish() being called.
+  virtual void AsyncExecute() = 0;
+
+  const Type mType;
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  const nsCString mScope;
+  const nsCString mScriptSpec;
+
+ private:
+  RefPtr<Callback> mFinalCallback;
+  nsTArray<RefPtr<Callback>> mResultCallbackList;
+  State mState;
+  bool mCanceled;
+  bool mResultCallbacksInvoked;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJob)
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_serviceworkerjob_h
diff --git a/dom/serviceworkers/ServiceWorkerJobQueue.cpp b/dom/serviceworkers/ServiceWorkerJobQueue.cpp
new file mode 100644
index 0000000000..497265249a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerJobQueue.cpp
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerJobQueue.h"
+
+#include "nsThreadUtils.h"
+#include "ServiceWorkerJob.h"
+#include "mozilla/dom/WorkerCommon.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerJobQueue::Callback final
+    : public ServiceWorkerJob::Callback {
+  RefPtr<ServiceWorkerJobQueue> mQueue;
+
+  ~Callback() = default;
+
+ public:
+  explicit Callback(ServiceWorkerJobQueue* aQueue) : mQueue(aQueue) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mQueue);
+  }
+
+  virtual void JobFinished(ServiceWorkerJob* aJob,
+                           ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    mQueue->JobFinished(aJob);
+  }
+
+  virtual void JobDiscarded(ErrorResult&) override {
+    // no-op; nothing to do.
+  }
+
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJobQueue::Callback, override)
+};
+
+ServiceWorkerJobQueue::~ServiceWorkerJobQueue() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mJobList.IsEmpty());
+}
+
+void ServiceWorkerJobQueue::JobFinished(ServiceWorkerJob* aJob) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aJob);
+
+  // XXX There are some corner cases where jobs can double-complete.  Until
+  // we track all these down we do a non-fatal assert in debug builds and
+  // a runtime check to verify the queue is in the correct state.
+  NS_ASSERTION(!mJobList.IsEmpty(),
+               "Job queue should contain the job that just completed.");
+  NS_ASSERTION(mJobList.SafeElementAt(0, nullptr) == aJob,
+               "Job queue should contain the job that just completed.");
+  if (NS_WARN_IF(mJobList.SafeElementAt(0, nullptr) != aJob)) {
+    return;
+  }
+
+  mJobList.RemoveElementAt(0);
+
+  if (mJobList.IsEmpty()) {
+    return;
+  }
+
+  RunJob();
+}
+
+void ServiceWorkerJobQueue::RunJob() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mJobList.IsEmpty());
+  MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Initial);
+
+  RefPtr<Callback> callback = new Callback(this);
+  mJobList[0]->Start(callback);
+}
+
+ServiceWorkerJobQueue::ServiceWorkerJobQueue() {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+void ServiceWorkerJobQueue::ScheduleJob(ServiceWorkerJob* aJob) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aJob);
+  MOZ_ASSERT(!mJobList.Contains(aJob));
+
+  if (mJobList.IsEmpty()) {
+    mJobList.AppendElement(aJob);
+    RunJob();
+    return;
+  }
+
+  MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);
+
+  RefPtr<ServiceWorkerJob>& tailJob = mJobList[mJobList.Length() - 1];
+  if (!tailJob->ResultCallbacksInvoked() && aJob->IsEquivalentTo(tailJob)) {
+    tailJob->StealResultCallbacksFrom(aJob);
+    return;
+  }
+
+  mJobList.AppendElement(aJob);
+}
+
+void ServiceWorkerJobQueue::CancelAll() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  for (RefPtr<ServiceWorkerJob>& job : mJobList) {
+    job->Cancel();
+  }
+
+  // Remove jobs that are queued but not started since they should never
+  // run after being canceled.  This means throwing away all jobs except
+  // for the job at the front of the list.
+  if (!mJobList.IsEmpty()) {
+    MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);
+    mJobList.TruncateLength(1);
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerJobQueue.h b/dom/serviceworkers/ServiceWorkerJobQueue.h
new file mode 100644
index 0000000000..9e51aefe4f
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerJobQueue.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerjobqueue_h
+#define mozilla_dom_serviceworkerjobqueue_h
+
+#include "mozilla/RefPtr.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerJob;
+
+class ServiceWorkerJobQueue final {
+  class Callback;
+
+  nsTArray<RefPtr<ServiceWorkerJob>> mJobList;
+
+  ~ServiceWorkerJobQueue();
+
+  void JobFinished(ServiceWorkerJob* aJob);
+
+  void RunJob();
+
+ public:
+  ServiceWorkerJobQueue();
+
+  void ScheduleJob(ServiceWorkerJob* aJob);
+
+  void CancelAll();
+
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJobQueue)
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerjobqueue_h
diff --git a/dom/serviceworkers/ServiceWorkerManager.cpp b/dom/serviceworkers/ServiceWorkerManager.cpp
new file mode 100644
index 0000000000..b0dcfca893
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerManager.cpp
@@ -0,0 +1,3380 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerManager.h"
+
+#include <algorithm>
+
+#include "nsCOMPtr.h"
+#include "nsICookieJarSettings.h"
+#include "nsIHttpChannel.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsINamed.h"
+#include "nsINetworkInterceptController.h"
+#include "nsIMutableArray.h"
+#include "nsIPrincipal.h"
+#include "nsITimer.h"
+#include "nsIUploadChannel2.h"
+#include "nsServiceManagerUtils.h"
+#include "nsDebug.h"
+#include "nsIPermissionManager.h"
+#include "nsXULAppAPI.h"
+
+#include "jsapi.h"
+
+#include "mozilla/AppShutdown.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/ErrorNames.h"
+#include "mozilla/LoadContext.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/ClientHandle.h"
+#include "mozilla/dom/ClientManager.h"
+#include "mozilla/dom/ClientSource.h"
+#include "mozilla/dom/ConsoleUtils.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/ErrorEvent.h"
+#include "mozilla/dom/Headers.h"
+#include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/NotificationEvent.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "mozilla/dom/Request.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/TypedArray.h"
+#include "mozilla/dom/SharedWorker.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerRunnable.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/extensions/WebExtensionPolicy.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "mozilla/dom/ScriptLoader.h"
+#include "mozilla/PermissionManager.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_extensions.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/Unused.h"
+#include "mozilla/EnumSet.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsIDUtils.h"
+#include "nsNetUtil.h"
+#include "nsProxyRelease.h"
+#include "nsQueryObject.h"
+#include "nsTArray.h"
+
+#include "ServiceWorker.h"
+#include "ServiceWorkerContainer.h"
+#include "ServiceWorkerInfo.h"
+#include "ServiceWorkerJobQueue.h"
+#include "ServiceWorkerManagerChild.h"
+#include "ServiceWorkerPrivate.h"
+#include "ServiceWorkerRegisterJob.h"
+#include "ServiceWorkerRegistrar.h"
+#include "ServiceWorkerRegistration.h"
+#include "ServiceWorkerScriptCache.h"
+#include "ServiceWorkerShutdownBlocker.h"
+#include "ServiceWorkerEvents.h"
+#include "ServiceWorkerUnregisterJob.h"
+#include "ServiceWorkerUpdateJob.h"
+#include "ServiceWorkerUtils.h"
+#include "ServiceWorkerQuotaUtils.h"
+
+#ifdef PostMessage
+#  undef PostMessage
+#endif
+
+mozilla::LazyLogModule sWorkerTelemetryLog("WorkerTelemetry");
+
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(_args) MOZ_LOG(sWorkerTelemetryLog, LogLevel::Debug, _args);
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+namespace mozilla::dom {
+
+// Counts the number of registered ServiceWorkers, and the number that
+// handle Fetch, for reporting in Telemetry
+uint32_t gServiceWorkersRegistered = 0;
+uint32_t gServiceWorkersRegisteredFetch = 0;
+
+static_assert(
+    nsIHttpChannelInternal::REDIRECT_MODE_FOLLOW ==
+        static_cast<uint32_t>(RequestRedirect::Follow),
+    "RequestRedirect enumeration value should make Necko Redirect mode value.");
+static_assert(
+    nsIHttpChannelInternal::REDIRECT_MODE_ERROR ==
+        static_cast<uint32_t>(RequestRedirect::Error),
+    "RequestRedirect enumeration value should make Necko Redirect mode value.");
+static_assert(
+    nsIHttpChannelInternal::REDIRECT_MODE_MANUAL ==
+        static_cast<uint32_t>(RequestRedirect::Manual),
+    "RequestRedirect enumeration value should make Necko Redirect mode value.");
+static_assert(
+    3 == RequestRedirectValues::Count,
+    "RequestRedirect enumeration value should make Necko Redirect mode value.");
+
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_DEFAULT ==
+        static_cast<uint32_t>(RequestCache::Default),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_NO_STORE ==
+        static_cast<uint32_t>(RequestCache::No_store),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_RELOAD ==
+        static_cast<uint32_t>(RequestCache::Reload),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_NO_CACHE ==
+        static_cast<uint32_t>(RequestCache::No_cache),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_FORCE_CACHE ==
+        static_cast<uint32_t>(RequestCache::Force_cache),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    nsIHttpChannelInternal::FETCH_CACHE_MODE_ONLY_IF_CACHED ==
+        static_cast<uint32_t>(RequestCache::Only_if_cached),
+    "RequestCache enumeration value should match Necko Cache mode value.");
+static_assert(
+    6 == RequestCacheValues::Count,
+    "RequestCache enumeration value should match Necko Cache mode value.");
+
+static_assert(static_cast<uint16_t>(ServiceWorkerUpdateViaCache::Imports) ==
+                  nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+              "nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_*"
+              " should match ServiceWorkerUpdateViaCache enumeration.");
+static_assert(static_cast<uint16_t>(ServiceWorkerUpdateViaCache::All) ==
+                  nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL,
+              "nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_*"
+              " should match ServiceWorkerUpdateViaCache enumeration.");
+static_assert(static_cast<uint16_t>(ServiceWorkerUpdateViaCache::None) ==
+                  nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE,
+              "nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_*"
+              " should match ServiceWorkerUpdateViaCache enumeration.");
+
+static StaticRefPtr<ServiceWorkerManager> gInstance;
+
+namespace {
+
+nsresult PopulateRegistrationData(
+    nsIPrincipal* aPrincipal,
+    const ServiceWorkerRegistrationInfo* aRegistration,
+    ServiceWorkerRegistrationData& aData) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aRegistration);
+
+  if (NS_WARN_IF(!BasePrincipal::Cast(aPrincipal)->IsContentPrincipal())) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsresult rv = PrincipalToPrincipalInfo(aPrincipal, &aData.principal());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  aData.scope() = aRegistration->Scope();
+
+  // TODO: When bug 1426401 is implemented we will need to handle more
+  //       than just the active worker here.
+  RefPtr<ServiceWorkerInfo> active = aRegistration->GetActive();
+  MOZ_ASSERT(active);
+  if (NS_WARN_IF(!active)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aData.currentWorkerURL() = active->ScriptSpec();
+  aData.cacheName() = active->CacheName();
+  aData.currentWorkerHandlesFetch() = active->HandlesFetch();
+
+  aData.currentWorkerInstalledTime() = active->GetInstalledTime();
+  aData.currentWorkerActivatedTime() = active->GetActivatedTime();
+
+  aData.updateViaCache() =
+      static_cast<uint32_t>(aRegistration->GetUpdateViaCache());
+
+  aData.lastUpdateTime() = aRegistration->GetLastUpdateTime();
+
+  aData.navigationPreloadState() = aRegistration->GetNavigationPreloadState();
+
+  MOZ_ASSERT(ServiceWorkerRegistrationDataIsValid(aData));
+
+  return NS_OK;
+}
+
+class TeardownRunnable final : public Runnable {
+ public:
+  explicit TeardownRunnable(ServiceWorkerManagerChild* aActor)
+      : Runnable("dom::ServiceWorkerManager::TeardownRunnable"),
+        mActor(aActor) {
+    MOZ_ASSERT(mActor);
+  }
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(mActor);
+    PServiceWorkerManagerChild::Send__delete__(mActor);
+    return NS_OK;
+  }
+
+ private:
+  ~TeardownRunnable() = default;
+
+  RefPtr<ServiceWorkerManagerChild> mActor;
+};
+
+constexpr char kFinishShutdownTopic[] = "profile-before-change-qm";
+
+already_AddRefed<nsIAsyncShutdownClient> GetAsyncShutdownBarrier() {
+  AssertIsOnMainThread();
+
+  nsCOMPtr<nsIAsyncShutdownService> svc = services::GetAsyncShutdownService();
+  MOZ_ASSERT(svc);
+
+  nsCOMPtr<nsIAsyncShutdownClient> barrier;
+  DebugOnly<nsresult> rv =
+      svc->GetProfileChangeTeardown(getter_AddRefs(barrier));
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  return barrier.forget();
+}
+
+Result<nsCOMPtr<nsIPrincipal>, nsresult> ScopeToPrincipal(
+    nsIURI* aScopeURI, const OriginAttributes& aOriginAttributes) {
+  MOZ_ASSERT(aScopeURI);
+
+  nsCOMPtr<nsIPrincipal> principal =
+      BasePrincipal::CreateContentPrincipal(aScopeURI, aOriginAttributes);
+  if (NS_WARN_IF(!principal)) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  return principal;
+}
+
+Result<nsCOMPtr<nsIPrincipal>, nsresult> ScopeToPrincipal(
+    const nsACString& aScope, const OriginAttributes& aOriginAttributes) {
+  MOZ_ASSERT(nsContentUtils::IsAbsoluteURL(aScope));
+
+  nsCOMPtr<nsIURI> scopeURI;
+  MOZ_TRY(NS_NewURI(getter_AddRefs(scopeURI), aScope));
+
+  return ScopeToPrincipal(scopeURI, aOriginAttributes);
+}
+
+}  // namespace
+
+struct ServiceWorkerManager::RegistrationDataPerPrincipal final {
+  // Implements a container of keys for the "scope to registration map":
+  // https://w3c.github.io/ServiceWorker/#dfn-scope-to-registration-map
+  //
+  // where each key is an absolute URL.
+  //
+  // The properties of this map that the spec uses are
+  // 1) insertion,
+  // 2) removal,
+  // 3) iteration of scopes in FIFO order (excluding removed scopes),
+  // 4) and finding, for a given path, the maximal length scope which is a
+  //    prefix of the path.
+  //
+  // Additionally, because this is a container of keys for a map, there
+  // shouldn't be duplicate scopes.
+  //
+  // The current implementation uses a dynamic array as the underlying
+  // container, which is not optimal for unbounded container sizes (all
+  // supported operations are in linear time) but may be superior for small
+  // container sizes.
+  //
+  // If this is proven to be too slow, the underlying storage should be replaced
+  // with a linked list of scopes in combination with an ordered map that maps
+  // scopes to linked list elements/iterators. This would reduce all of the
+  // above operations besides iteration (necessarily linear) to logarithmic
+  // time.
+  class ScopeContainer final : private nsTArray<nsCString> {
+    using Base = nsTArray<nsCString>;
+
+   public:
+    using Base::Contains;
+    using Base::IsEmpty;
+    using Base::Length;
+
+    // No using-declaration to avoid importing the non-const overload.
+    decltype(auto) operator[](Base::index_type aIndex) const {
+      return Base::operator[](aIndex);
+    }
+
+    void InsertScope(const nsACString& aScope) {
+      MOZ_DIAGNOSTIC_ASSERT(nsContentUtils::IsAbsoluteURL(aScope));
+
+      if (Contains(aScope)) {
+        return;
+      }
+
+      AppendElement(aScope);
+    }
+
+    void RemoveScope(const nsACString& aScope) {
+      MOZ_ALWAYS_TRUE(RemoveElement(aScope));
+    }
+
+    // Implements most of "Match Service Worker Registration":
+    // https://w3c.github.io/ServiceWorker/#scope-match-algorithm
+    Maybe<nsCString> MatchScope(const nsACString& aClientUrl) const {
+      Maybe<nsCString> match;
+
+      for (const nsCString& scope : *this) {
+        if (StringBeginsWith(aClientUrl, scope)) {
+          if (!match || scope.Length() > match->Length()) {
+            match = Some(scope);
+          }
+        }
+      }
+
+      // Step 7.2:
+      // "Assert: matchingScope’s origin and clientURL’s origin are same
+      // origin."
+      MOZ_DIAGNOSTIC_ASSERT_IF(match, IsSameOrigin(*match, aClientUrl));
+
+      return match;
+    }
+
+   private:
+    bool IsSameOrigin(const nsACString& aMatchingScope,
+                      const nsACString& aClientUrl) const {
+      auto parseResult = ScopeToPrincipal(aMatchingScope, OriginAttributes());
+
+      if (NS_WARN_IF(parseResult.isErr())) {
+        return false;
+      }
+
+      auto scopePrincipal = parseResult.unwrap();
+
+      parseResult = ScopeToPrincipal(aClientUrl, OriginAttributes());
+
+      if (NS_WARN_IF(parseResult.isErr())) {
+        return false;
+      }
+
+      auto clientPrincipal = parseResult.unwrap();
+
+      bool equals = false;
+
+      if (NS_WARN_IF(
+              NS_FAILED(scopePrincipal->Equals(clientPrincipal, &equals)))) {
+        return false;
+      }
+
+      return equals;
+    }
+  };
+
+  ScopeContainer mScopeContainer;
+
+  // Scope to registration.
+  // The scope should be a fully qualified valid URL.
+  nsRefPtrHashtable<nsCStringHashKey, ServiceWorkerRegistrationInfo> mInfos;
+
+  // Maps scopes to job queues.
+  nsRefPtrHashtable<nsCStringHashKey, ServiceWorkerJobQueue> mJobQueues;
+
+  // Map scopes to scheduled update timers.
+  nsInterfaceHashtable<nsCStringHashKey, nsITimer> mUpdateTimers;
+
+  // The number of times we have done a quota usage check for this origin for
+  // mitigation purposes.  See the docs on nsIServiceWorkerRegistrationInfo,
+  // where this value is exposed.
+  int32_t mQuotaUsageCheckCount = 0;
+};
+
+//////////////////////////
+// ServiceWorkerManager //
+//////////////////////////
+
+NS_IMPL_ADDREF(ServiceWorkerManager)
+NS_IMPL_RELEASE(ServiceWorkerManager)
+
+NS_INTERFACE_MAP_BEGIN(ServiceWorkerManager)
+  NS_INTERFACE_MAP_ENTRY(nsIServiceWorkerManager)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIServiceWorkerManager)
+NS_INTERFACE_MAP_END
+
+ServiceWorkerManager::ServiceWorkerManager()
+    : mActor(nullptr), mShuttingDown(false) {}
+
+ServiceWorkerManager::~ServiceWorkerManager() {
+  // The map will assert if it is not empty when destroyed.
+  mRegistrationInfos.Clear();
+
+  // This can happen if the browser is started up in ProfileManager mode, in
+  // which case XPCOM will startup and shutdown, but there won't be any
+  // profile-* topic notifications. The shutdown blocker expects to be in a
+  // NotAcceptingPromises state when it's destroyed, and this transition
+  // normally happens in the "profile-change-teardown" notification callback
+  // (which won't be called in ProfileManager mode).
+  if (!mShuttingDown && mShutdownBlocker) {
+    mShutdownBlocker->StopAcceptingPromises();
+  }
+}
+
+void ServiceWorkerManager::BlockShutdownOn(GenericNonExclusivePromise* aPromise,
+                                           uint32_t aShutdownStateId) {
+  AssertIsOnMainThread();
+
+  MOZ_ASSERT(mShutdownBlocker);
+  MOZ_ASSERT(aPromise);
+
+  mShutdownBlocker->WaitOnPromise(aPromise, aShutdownStateId);
+}
+
+void ServiceWorkerManager::Init(ServiceWorkerRegistrar* aRegistrar) {
+  // ServiceWorkers now only support parent intercept.  In parent intercept
+  // mode, only the parent process ServiceWorkerManager has any state or does
+  // anything.
+  //
+  // It is our goal to completely eliminate support for content process
+  // ServiceWorkerManager instances and make getting a SWM instance trigger a
+  // fatal assertion.  But until we've reached that point, we make
+  // initialization a no-op so that content process ServiceWorkerManager
+  // instances will simply have no state and no registrations.
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  nsCOMPtr<nsIAsyncShutdownClient> shutdownBarrier = GetAsyncShutdownBarrier();
+
+  if (shutdownBarrier) {
+    mShutdownBlocker = ServiceWorkerShutdownBlocker::CreateAndRegisterOn(
+        *shutdownBarrier, *this);
+    MOZ_ASSERT(mShutdownBlocker);
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(aRegistrar);
+
+  PBackgroundChild* actorChild = BackgroundChild::GetOrCreateForCurrentThread();
+  if (NS_WARN_IF(!actorChild)) {
+    MaybeStartShutdown();
+    return;
+  }
+
+  PServiceWorkerManagerChild* actor =
+      actorChild->SendPServiceWorkerManagerConstructor();
+  if (!actor) {
+    MaybeStartShutdown();
+    return;
+  }
+
+  mActor = static_cast<ServiceWorkerManagerChild*>(actor);
+
+  // mActor must be set before LoadRegistrations is called because it can purge
+  // service workers if preferences are disabled.
+  nsTArray<ServiceWorkerRegistrationData> data;
+  aRegistrar->GetRegistrations(data);
+  LoadRegistrations(data);
+
+  mTelemetryLastChange = TimeStamp::Now();
+}
+
+void ServiceWorkerManager::RecordTelemetry(uint32_t aNumber, uint32_t aFetch) {
+  // Submit N value pairs to Telemetry for the time we were at those values
+  auto now = TimeStamp::Now();
+  // round down, with a minimum of 1 repeat.  In theory this gives
+  // inaccuracy if there are frequent changes, but that's uncommon.
+  uint32_t repeats = (uint32_t)((now - mTelemetryLastChange).ToMilliseconds()) /
+                     mTelemetryPeriodMs;
+  mTelemetryLastChange = now;
+  if (repeats == 0) {
+    repeats = 1;
+  }
+  nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
+      "ServiceWorkerTelemetryRunnable", [aNumber, aFetch, repeats]() {
+        LOG(("ServiceWorkers running: %u samples of %u/%u", repeats, aNumber,
+             aFetch));
+        // Don't allocate infinitely huge arrays if someone visits a SW site
+        // after a few months running. 1 month is about 500K repeats @ 5s
+        // sampling
+        uint32_t num_repeats = std::min(repeats, 1000000U);  // 4MB max
+        nsTArray<uint32_t> values;
+
+        uint32_t* array = values.AppendElements(num_repeats);
+        for (uint32_t i = 0; i < num_repeats; i++) {
+          array[i] = aNumber;
+        }
+        Telemetry::Accumulate(Telemetry::SERVICE_WORKER_RUNNING, "All"_ns,
+                              values);
+
+        for (uint32_t i = 0; i < num_repeats; i++) {
+          array[i] = aFetch;
+        }
+        Telemetry::Accumulate(Telemetry::SERVICE_WORKER_RUNNING, "Fetch"_ns,
+                              values);
+      });
+  NS_DispatchBackgroundTask(runnable.forget(), nsIEventTarget::DISPATCH_NORMAL);
+}
+
+RefPtr<GenericErrorResultPromise> ServiceWorkerManager::StartControllingClient(
+    const ClientInfo& aClientInfo,
+    ServiceWorkerRegistrationInfo* aRegistrationInfo,
+    bool aControlClientHandle) {
+  MOZ_DIAGNOSTIC_ASSERT(aRegistrationInfo->GetActive());
+
+  // XXX We can't use a generic lambda (accepting auto&& entry) like elsewhere
+  // with WithEntryHandle, since we get linker errors then using clang+lld. This
+  // might be a toolchain issue?
+  return mControlledClients.WithEntryHandle(
+      aClientInfo.Id(),
+      [&](decltype(mControlledClients)::EntryHandle&& entry)
+          -> RefPtr<GenericErrorResultPromise> {
+        const RefPtr<ServiceWorkerManager> self = this;
+
+        const ServiceWorkerDescriptor& active =
+            aRegistrationInfo->GetActive()->Descriptor();
+
+        if (entry) {
+          const RefPtr<ServiceWorkerRegistrationInfo> old =
+              std::move(entry.Data()->mRegistrationInfo);
+
+          const RefPtr<GenericErrorResultPromise> promise =
+              aControlClientHandle
+                  ? entry.Data()->mClientHandle->Control(active)
+                  : GenericErrorResultPromise::CreateAndResolve(false,
+                                                                __func__);
+
+          entry.Data()->mRegistrationInfo = aRegistrationInfo;
+
+          if (old != aRegistrationInfo) {
+            StopControllingRegistration(old);
+            aRegistrationInfo->StartControllingClient();
+          }
+
+          Telemetry::Accumulate(Telemetry::SERVICE_WORKER_CONTROLLED_DOCUMENTS,
+                                1);
+
+          // Always check to see if we failed to actually control the client. In
+          // that case remove the client from our list of controlled clients.
+          return promise->Then(
+              GetMainThreadSerialEventTarget(), __func__,
+              [](bool) {
+                // do nothing on success
+                return GenericErrorResultPromise::CreateAndResolve(true,
+                                                                   __func__);
+              },
+              [self, aClientInfo](const CopyableErrorResult& aRv) {
+                // failed to control, forget about this client
+                self->StopControllingClient(aClientInfo);
+                return GenericErrorResultPromise::CreateAndReject(aRv,
+                                                                  __func__);
+              });
+        }
+
+        RefPtr<ClientHandle> clientHandle = ClientManager::CreateHandle(
+            aClientInfo, GetMainThreadSerialEventTarget());
+
+        const RefPtr<GenericErrorResultPromise> promise =
+            aControlClientHandle
+                ? clientHandle->Control(active)
+                : GenericErrorResultPromise::CreateAndResolve(false, __func__);
+
+        aRegistrationInfo->StartControllingClient();
+
+        entry.Insert(
+            MakeUnique<ControlledClientData>(clientHandle, aRegistrationInfo));
+
+        clientHandle->OnDetach()->Then(
+            GetMainThreadSerialEventTarget(), __func__,
+            [self, aClientInfo] { self->StopControllingClient(aClientInfo); });
+
+        Telemetry::Accumulate(Telemetry::SERVICE_WORKER_CONTROLLED_DOCUMENTS,
+                              1);
+
+        // Always check to see if we failed to actually control the client.  In
+        // that case removed the client from our list of controlled clients.
+        return promise->Then(
+            GetMainThreadSerialEventTarget(), __func__,
+            [](bool) {
+              // do nothing on success
+              return GenericErrorResultPromise::CreateAndResolve(true,
+                                                                 __func__);
+            },
+            [self, aClientInfo](const CopyableErrorResult& aRv) {
+              // failed to control, forget about this client
+              self->StopControllingClient(aClientInfo);
+              return GenericErrorResultPromise::CreateAndReject(aRv, __func__);
+            });
+      });
+}
+
+void ServiceWorkerManager::StopControllingClient(
+    const ClientInfo& aClientInfo) {
+  auto entry = mControlledClients.Lookup(aClientInfo.Id());
+  if (!entry) {
+    return;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> reg =
+      std::move(entry.Data()->mRegistrationInfo);
+
+  entry.Remove();
+
+  StopControllingRegistration(reg);
+}
+
+void ServiceWorkerManager::MaybeStartShutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  mShuttingDown = true;
+
+  for (const auto& dataPtr : mRegistrationInfos.Values()) {
+    for (const auto& timerEntry : dataPtr->mUpdateTimers.Values()) {
+      timerEntry->Cancel();
+    }
+    dataPtr->mUpdateTimers.Clear();
+
+    for (const auto& queueEntry : dataPtr->mJobQueues.Values()) {
+      queueEntry->CancelAll();
+    }
+    dataPtr->mJobQueues.Clear();
+
+    for (const auto& registrationEntry : dataPtr->mInfos.Values()) {
+      registrationEntry->ShutdownWorkers();
+    }
+
+    // ServiceWorkerCleanup may try to unregister registrations, so don't clear
+    // mInfos.
+  }
+
+  for (const auto& entry : mControlledClients.Values()) {
+    entry->mRegistrationInfo->ShutdownWorkers();
+  }
+
+  for (auto iter = mOrphanedRegistrations.iter(); !iter.done(); iter.next()) {
+    iter.get()->ShutdownWorkers();
+  }
+
+  if (mShutdownBlocker) {
+    mShutdownBlocker->StopAcceptingPromises();
+  }
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->AddObserver(this, kFinishShutdownTopic, false);
+    return;
+  }
+
+  MaybeFinishShutdown();
+}
+
+void ServiceWorkerManager::MaybeFinishShutdown() {
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->RemoveObserver(this, kFinishShutdownTopic);
+  }
+
+  if (!mActor) {
+    return;
+  }
+
+  mActor->ManagerShuttingDown();
+
+  RefPtr<TeardownRunnable> runnable = new TeardownRunnable(mActor);
+  nsresult rv = NS_DispatchToMainThread(runnable);
+  Unused << NS_WARN_IF(NS_FAILED(rv));
+  mActor = nullptr;
+
+  // This also submits final telemetry
+  ServiceWorkerPrivate::RunningShutdown();
+}
+
+class ServiceWorkerResolveWindowPromiseOnRegisterCallback final
+    : public ServiceWorkerJob::Callback {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(
+      ServiceWorkerResolveWindowPromiseOnRegisterCallback, override)
+
+  virtual void JobFinished(ServiceWorkerJob* aJob,
+                           ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aJob);
+
+    if (aStatus.Failed()) {
+      mPromiseHolder.Reject(CopyableErrorResult(aStatus), __func__);
+      return;
+    }
+
+    MOZ_ASSERT(aJob->GetType() == ServiceWorkerJob::Type::Register);
+    RefPtr<ServiceWorkerRegisterJob> registerJob =
+        static_cast<ServiceWorkerRegisterJob*>(aJob);
+    RefPtr<ServiceWorkerRegistrationInfo> reg = registerJob->GetRegistration();
+
+    mPromiseHolder.Resolve(reg->Descriptor(), __func__);
+  }
+
+  virtual void JobDiscarded(ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    mPromiseHolder.Reject(CopyableErrorResult(aStatus), __func__);
+  }
+
+  RefPtr<ServiceWorkerRegistrationPromise> Promise() {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mPromiseHolder.Ensure(__func__);
+  }
+
+ private:
+  ~ServiceWorkerResolveWindowPromiseOnRegisterCallback() = default;
+
+  MozPromiseHolder<ServiceWorkerRegistrationPromise> mPromiseHolder;
+};
+
+NS_IMETHODIMP
+ServiceWorkerManager::RegisterForTest(nsIPrincipal* aPrincipal,
+                                      const nsAString& aScopeURL,
+                                      const nsAString& aScriptURL,
+                                      JSContext* aCx,
+                                      mozilla::dom::Promise** aPromise) {
+  nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
+  if (NS_WARN_IF(!global)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult erv;
+  RefPtr<Promise> outer = Promise::Create(global, erv);
+  if (NS_WARN_IF(erv.Failed())) {
+    return erv.StealNSResult();
+  }
+
+  if (!StaticPrefs::dom_serviceWorkers_testing_enabled()) {
+    outer->MaybeRejectWithAbortError(
+        "registerForTest only allowed when dom.serviceWorkers.testing.enabled "
+        "is true");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  if (aPrincipal == nullptr) {
+    outer->MaybeRejectWithAbortError("Missing principal");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  if (aScriptURL.IsEmpty()) {
+    outer->MaybeRejectWithAbortError("Missing script url");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  if (aScopeURL.IsEmpty()) {
+    outer->MaybeRejectWithAbortError("Missing scope url");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  // The ClientType isn't really used here, but ClientType::Window
+  // is the least bad choice since this is happening on the main thread.
+  Maybe<ClientInfo> clientInfo =
+      dom::ClientManager::CreateInfo(ClientType::Window, aPrincipal);
+
+  if (!clientInfo.isSome()) {
+    outer->MaybeRejectWithUnknownError("Error creating clientInfo");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  auto scope = NS_ConvertUTF16toUTF8(aScopeURL);
+  auto scriptURL = NS_ConvertUTF16toUTF8(aScriptURL);
+
+  auto regPromise = Register(clientInfo.ref(), scope, scriptURL,
+                             dom::ServiceWorkerUpdateViaCache::Imports);
+  const RefPtr<ServiceWorkerManager> self(this);
+  const nsCOMPtr<nsIPrincipal> principal(aPrincipal);
+  regPromise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      [self, outer, principal,
+       scope](const ServiceWorkerRegistrationDescriptor& regDesc) {
+        RefPtr<ServiceWorkerRegistrationInfo> registration =
+            self->GetRegistration(principal, NS_ConvertUTF16toUTF8(scope));
+        if (registration) {
+          outer->MaybeResolve(registration);
+        } else {
+          outer->MaybeRejectWithUnknownError(
+              "Failed to retrieve ServiceWorkerRegistrationInfo");
+        }
+      },
+      [outer](const mozilla::CopyableErrorResult& err) {
+        CopyableErrorResult result(err);
+        outer->MaybeReject(std::move(result));
+      });
+
+  outer.forget(aPromise);
+
+  return NS_OK;
+}
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerManager::Register(
+    const ClientInfo& aClientInfo, const nsACString& aScopeURL,
+    const nsACString& aScriptURL, ServiceWorkerUpdateViaCache aUpdateViaCache) {
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), aScopeURL);
+  if (NS_FAILED(rv)) {
+    // Odd, since it was serialiazed from an nsIURI.
+    CopyableErrorResult err;
+    err.ThrowInvalidStateError("Scope URL cannot be parsed");
+    return ServiceWorkerRegistrationPromise::CreateAndReject(err, __func__);
+  }
+
+  nsCOMPtr<nsIURI> scriptURI;
+  rv = NS_NewURI(getter_AddRefs(scriptURI), aScriptURL);
+  if (NS_FAILED(rv)) {
+    // Odd, since it was serialiazed from an nsIURI.
+    CopyableErrorResult err;
+    err.ThrowInvalidStateError("Script URL cannot be parsed");
+    return ServiceWorkerRegistrationPromise::CreateAndReject(err, __func__);
+  }
+
+  IgnoredErrorResult err;
+  ServiceWorkerScopeAndScriptAreValid(aClientInfo, scopeURI, scriptURI, err);
+  if (err.Failed()) {
+    return ServiceWorkerRegistrationPromise::CreateAndReject(
+        CopyableErrorResult(std::move(err)), __func__);
+  }
+
+  // If the previous validation step passed then we must have a principal.
+  auto principalOrErr = aClientInfo.GetPrincipal();
+
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return ServiceWorkerRegistrationPromise::CreateAndReject(
+        CopyableErrorResult(principalOrErr.unwrapErr()), __func__);
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+  nsAutoCString scopeKey;
+  rv = PrincipalToScopeKey(principal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return ServiceWorkerRegistrationPromise::CreateAndReject(
+        CopyableErrorResult(rv), __func__);
+  }
+
+  RefPtr<ServiceWorkerJobQueue> queue =
+      GetOrCreateJobQueue(scopeKey, aScopeURL);
+
+  RefPtr<ServiceWorkerResolveWindowPromiseOnRegisterCallback> cb =
+      new ServiceWorkerResolveWindowPromiseOnRegisterCallback();
+
+  RefPtr<ServiceWorkerRegisterJob> job = new ServiceWorkerRegisterJob(
+      principal, aScopeURL, aScriptURL,
+      static_cast<ServiceWorkerUpdateViaCache>(aUpdateViaCache));
+
+  job->AppendResultCallback(cb);
+  queue->ScheduleJob(job);
+
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return cb->Promise();
+}
+
+/*
+ * Implements the async aspects of the getRegistrations algorithm.
+ */
+class GetRegistrationsRunnable final : public Runnable {
+  const ClientInfo mClientInfo;
+  RefPtr<ServiceWorkerRegistrationListPromise::Private> mPromise;
+
+ public:
+  explicit GetRegistrationsRunnable(const ClientInfo& aClientInfo)
+      : Runnable("dom::ServiceWorkerManager::GetRegistrationsRunnable"),
+        mClientInfo(aClientInfo),
+        mPromise(new ServiceWorkerRegistrationListPromise::Private(__func__)) {}
+
+  RefPtr<ServiceWorkerRegistrationListPromise> Promise() const {
+    return mPromise;
+  }
+
+  NS_IMETHOD
+  Run() override {
+    auto scopeExit = MakeScopeExit(
+        [&] { mPromise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+    if (!swm) {
+      return NS_OK;
+    }
+
+    auto principalOrErr = mClientInfo.GetPrincipal();
+    if (NS_WARN_IF(principalOrErr.isErr())) {
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+
+    nsTArray<ServiceWorkerRegistrationDescriptor> array;
+
+    if (NS_WARN_IF(!BasePrincipal::Cast(principal)->IsContentPrincipal())) {
+      return NS_OK;
+    }
+
+    nsAutoCString scopeKey;
+    nsresult rv = swm->PrincipalToScopeKey(principal, scopeKey);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    ServiceWorkerManager::RegistrationDataPerPrincipal* data;
+    if (!swm->mRegistrationInfos.Get(scopeKey, &data)) {
+      scopeExit.release();
+      mPromise->Resolve(array, __func__);
+      return NS_OK;
+    }
+
+    for (uint32_t i = 0; i < data->mScopeContainer.Length(); ++i) {
+      RefPtr<ServiceWorkerRegistrationInfo> info =
+          data->mInfos.GetWeak(data->mScopeContainer[i]);
+
+      NS_ConvertUTF8toUTF16 scope(data->mScopeContainer[i]);
+
+      nsCOMPtr<nsIURI> scopeURI;
+      nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), scope);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        break;
+      }
+
+      // Unfortunately we don't seem to have an obvious window id here; in
+      // particular ClientInfo does not have one, and neither do service worker
+      // registrations, as far as I can tell.
+      rv = principal->CheckMayLoadWithReporting(
+          scopeURI, false /* allowIfInheritsPrincipal */,
+          0 /* innerWindowID */);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        continue;
+      }
+
+      array.AppendElement(info->Descriptor());
+    }
+
+    scopeExit.release();
+    mPromise->Resolve(array, __func__);
+
+    return NS_OK;
+  }
+};
+
+RefPtr<ServiceWorkerRegistrationListPromise>
+ServiceWorkerManager::GetRegistrations(const ClientInfo& aClientInfo) const {
+  RefPtr<GetRegistrationsRunnable> runnable =
+      new GetRegistrationsRunnable(aClientInfo);
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(runnable));
+  return runnable->Promise();
+}
+
+/*
+ * Implements the async aspects of the getRegistration algorithm.
+ */
+class GetRegistrationRunnable final : public Runnable {
+  const ClientInfo mClientInfo;
+  RefPtr<ServiceWorkerRegistrationPromise::Private> mPromise;
+  nsCString mURL;
+
+ public:
+  GetRegistrationRunnable(const ClientInfo& aClientInfo, const nsACString& aURL)
+      : Runnable("dom::ServiceWorkerManager::GetRegistrationRunnable"),
+        mClientInfo(aClientInfo),
+        mPromise(new ServiceWorkerRegistrationPromise::Private(__func__)),
+        mURL(aURL) {}
+
+  RefPtr<ServiceWorkerRegistrationPromise> Promise() const { return mPromise; }
+
+  NS_IMETHOD
+  Run() override {
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+    if (!swm) {
+      mPromise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__);
+      return NS_OK;
+    }
+
+    auto principalOrErr = mClientInfo.GetPrincipal();
+    if (NS_WARN_IF(principalOrErr.isErr())) {
+      mPromise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__);
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+    nsCOMPtr<nsIURI> uri;
+    nsresult rv = NS_NewURI(getter_AddRefs(uri), mURL);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mPromise->Reject(rv, __func__);
+      return NS_OK;
+    }
+
+    // Unfortunately we don't seem to have an obvious window id here; in
+    // particular ClientInfo does not have one, and neither do service worker
+    // registrations, as far as I can tell.
+    rv = principal->CheckMayLoadWithReporting(
+        uri, false /* allowIfInheritsPrincipal */, 0 /* innerWindowID */);
+    if (NS_FAILED(rv)) {
+      mPromise->Reject(NS_ERROR_DOM_SECURITY_ERR, __func__);
+      return NS_OK;
+    }
+
+    RefPtr<ServiceWorkerRegistrationInfo> registration =
+        swm->GetServiceWorkerRegistrationInfo(principal, uri);
+
+    if (!registration) {
+      // Reject with NS_OK means "not found".
+      mPromise->Reject(NS_OK, __func__);
+      return NS_OK;
+    }
+
+    mPromise->Resolve(registration->Descriptor(), __func__);
+
+    return NS_OK;
+  }
+};
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerManager::GetRegistration(
+    const ClientInfo& aClientInfo, const nsACString& aURL) const {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<GetRegistrationRunnable> runnable =
+      new GetRegistrationRunnable(aClientInfo, aURL);
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(runnable));
+
+  return runnable->Promise();
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::SendPushEvent(const nsACString& aOriginAttributes,
+                                    const nsACString& aScope,
+                                    const nsTArray<uint8_t>& aDataBytes,
+                                    uint8_t optional_argc) {
+  if (optional_argc == 1) {
+    // This does one copy here (while constructing the Maybe) and another when
+    // we end up copying into the SendPushEventRunnable.  We could fix that to
+    // only do one copy by making things between here and there take
+    // Maybe<nsTArray<uint8_t>>&&, but then we'd need to copy before we know
+    // whether we really need to in PushMessageDispatcher::NotifyWorkers.  Since
+    // in practice this only affects JS callers that pass data, and we don't
+    // have any right now, let's not worry about it.
+    return SendPushEvent(aOriginAttributes, aScope, u""_ns,
+                         Some(aDataBytes.Clone()));
+  }
+  MOZ_ASSERT(optional_argc == 0);
+  return SendPushEvent(aOriginAttributes, aScope, u""_ns, Nothing());
+}
+
+nsresult ServiceWorkerManager::SendPushEvent(
+    const nsACString& aOriginAttributes, const nsACString& aScope,
+    const nsAString& aMessageId, const Maybe<nsTArray<uint8_t>>& aData) {
+  OriginAttributes attrs;
+  if (!attrs.PopulateFromSuffix(aOriginAttributes)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal;
+  MOZ_TRY_VAR(principal, ScopeToPrincipal(aScope, attrs));
+
+  // The registration handling a push notification must have an exact scope
+  // match. This will try to find an exact match, unlike how fetch may find the
+  // registration with the longest scope that's a prefix of the fetched URL.
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetRegistration(principal, aScope);
+  if (NS_WARN_IF(!registration)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(registration->Scope().Equals(aScope));
+
+  ServiceWorkerInfo* serviceWorker = registration->GetActive();
+  if (NS_WARN_IF(!serviceWorker)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return serviceWorker->WorkerPrivate()->SendPushEvent(aMessageId, aData,
+                                                       registration);
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::SendPushSubscriptionChangeEvent(
+    const nsACString& aOriginAttributes, const nsACString& aScope) {
+  OriginAttributes attrs;
+  if (!attrs.PopulateFromSuffix(aOriginAttributes)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  ServiceWorkerInfo* info = GetActiveWorkerInfoForScope(attrs, aScope);
+  if (!info) {
+    return NS_ERROR_FAILURE;
+  }
+  return info->WorkerPrivate()->SendPushSubscriptionChangeEvent();
+}
+
+nsresult ServiceWorkerManager::SendNotificationEvent(
+    const nsAString& aEventName, const nsACString& aOriginSuffix,
+    const nsACString& aScope, const nsAString& aID, const nsAString& aTitle,
+    const nsAString& aDir, const nsAString& aLang, const nsAString& aBody,
+    const nsAString& aTag, const nsAString& aIcon, const nsAString& aData,
+    const nsAString& aBehavior) {
+  OriginAttributes attrs;
+  if (!attrs.PopulateFromSuffix(aOriginSuffix)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  ServiceWorkerInfo* info = GetActiveWorkerInfoForScope(attrs, aScope);
+  if (!info) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ServiceWorkerPrivate* workerPrivate = info->WorkerPrivate();
+  return workerPrivate->SendNotificationEvent(
+      aEventName, aID, aTitle, aDir, aLang, aBody, aTag, aIcon, aData,
+      aBehavior, NS_ConvertUTF8toUTF16(aScope));
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::SendNotificationClickEvent(
+    const nsACString& aOriginSuffix, const nsACString& aScope,
+    const nsAString& aID, const nsAString& aTitle, const nsAString& aDir,
+    const nsAString& aLang, const nsAString& aBody, const nsAString& aTag,
+    const nsAString& aIcon, const nsAString& aData,
+    const nsAString& aBehavior) {
+  return SendNotificationEvent(nsLiteralString(NOTIFICATION_CLICK_EVENT_NAME),
+                               aOriginSuffix, aScope, aID, aTitle, aDir, aLang,
+                               aBody, aTag, aIcon, aData, aBehavior);
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::SendNotificationCloseEvent(
+    const nsACString& aOriginSuffix, const nsACString& aScope,
+    const nsAString& aID, const nsAString& aTitle, const nsAString& aDir,
+    const nsAString& aLang, const nsAString& aBody, const nsAString& aTag,
+    const nsAString& aIcon, const nsAString& aData,
+    const nsAString& aBehavior) {
+  return SendNotificationEvent(nsLiteralString(NOTIFICATION_CLOSE_EVENT_NAME),
+                               aOriginSuffix, aScope, aID, aTitle, aDir, aLang,
+                               aBody, aTag, aIcon, aData, aBehavior);
+}
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerManager::WhenReady(
+    const ClientInfo& aClientInfo) {
+  AssertIsOnMainThread();
+
+  for (auto& prd : mPendingReadyList) {
+    if (prd->mClientHandle->Info().Id() == aClientInfo.Id() &&
+        prd->mClientHandle->Info().PrincipalInfo() ==
+            aClientInfo.PrincipalInfo()) {
+      return prd->mPromise;
+    }
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> reg =
+      GetServiceWorkerRegistrationInfo(aClientInfo);
+  if (reg && reg->GetActive()) {
+    return ServiceWorkerRegistrationPromise::CreateAndResolve(reg->Descriptor(),
+                                                              __func__);
+  }
+
+  nsCOMPtr<nsISerialEventTarget> target = GetMainThreadSerialEventTarget();
+
+  RefPtr<ClientHandle> handle =
+      ClientManager::CreateHandle(aClientInfo, target);
+  mPendingReadyList.AppendElement(MakeUnique<PendingReadyData>(handle));
+
+  RefPtr<ServiceWorkerManager> self(this);
+  handle->OnDetach()->Then(target, __func__,
+                           [self = std::move(self), aClientInfo] {
+                             self->RemovePendingReadyPromise(aClientInfo);
+                           });
+
+  return mPendingReadyList.LastElement()->mPromise;
+}
+
+void ServiceWorkerManager::CheckPendingReadyPromises() {
+  nsTArray<UniquePtr<PendingReadyData>> pendingReadyList =
+      std::move(mPendingReadyList);
+  for (uint32_t i = 0; i < pendingReadyList.Length(); ++i) {
+    UniquePtr<PendingReadyData> prd(std::move(pendingReadyList[i]));
+
+    RefPtr<ServiceWorkerRegistrationInfo> reg =
+        GetServiceWorkerRegistrationInfo(prd->mClientHandle->Info());
+
+    if (reg && reg->GetActive()) {
+      prd->mPromise->Resolve(reg->Descriptor(), __func__);
+    } else {
+      mPendingReadyList.AppendElement(std::move(prd));
+    }
+  }
+}
+
+void ServiceWorkerManager::RemovePendingReadyPromise(
+    const ClientInfo& aClientInfo) {
+  nsTArray<UniquePtr<PendingReadyData>> pendingReadyList =
+      std::move(mPendingReadyList);
+  for (uint32_t i = 0; i < pendingReadyList.Length(); ++i) {
+    UniquePtr<PendingReadyData> prd(std::move(pendingReadyList[i]));
+
+    if (prd->mClientHandle->Info().Id() == aClientInfo.Id() &&
+        prd->mClientHandle->Info().PrincipalInfo() ==
+            aClientInfo.PrincipalInfo()) {
+      prd->mPromise->Reject(NS_ERROR_DOM_ABORT_ERR, __func__);
+    } else {
+      mPendingReadyList.AppendElement(std::move(prd));
+    }
+  }
+}
+
+void ServiceWorkerManager::NoteInheritedController(
+    const ClientInfo& aClientInfo, const ServiceWorkerDescriptor& aController) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  auto principalOrErr = PrincipalInfoToPrincipal(aController.PrincipalInfo());
+
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+  nsCOMPtr<nsIURI> scope;
+  nsresult rv = NS_NewURI(getter_AddRefs(scope), aController.Scope());
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetServiceWorkerRegistrationInfo(principal, scope);
+  NS_ENSURE_TRUE_VOID(registration);
+  NS_ENSURE_TRUE_VOID(registration->GetActive());
+
+  StartControllingClient(aClientInfo, registration,
+                         false /* aControlClientHandle */);
+}
+
+ServiceWorkerInfo* ServiceWorkerManager::GetActiveWorkerInfoForScope(
+    const OriginAttributes& aOriginAttributes, const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), aScope);
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  auto result = ScopeToPrincipal(scopeURI, aOriginAttributes);
+  if (NS_WARN_IF(result.isErr())) {
+    return nullptr;
+  }
+
+  auto principal = result.unwrap();
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetServiceWorkerRegistrationInfo(principal, scopeURI);
+  if (!registration) {
+    return nullptr;
+  }
+
+  return registration->GetActive();
+}
+
+namespace {
+
+class UnregisterJobCallback final : public ServiceWorkerJob::Callback {
+  nsCOMPtr<nsIServiceWorkerUnregisterCallback> mCallback;
+
+  ~UnregisterJobCallback() { MOZ_ASSERT(!mCallback); }
+
+ public:
+  explicit UnregisterJobCallback(nsIServiceWorkerUnregisterCallback* aCallback)
+      : mCallback(aCallback) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCallback);
+  }
+
+  void JobFinished(ServiceWorkerJob* aJob, ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aJob);
+    MOZ_ASSERT(mCallback);
+
+    auto scopeExit = MakeScopeExit([&]() { mCallback = nullptr; });
+
+    if (aStatus.Failed()) {
+      mCallback->UnregisterFailed();
+      return;
+    }
+
+    MOZ_ASSERT(aJob->GetType() == ServiceWorkerJob::Type::Unregister);
+    RefPtr<ServiceWorkerUnregisterJob> unregisterJob =
+        static_cast<ServiceWorkerUnregisterJob*>(aJob);
+    mCallback->UnregisterSucceeded(unregisterJob->GetResult());
+  }
+
+  void JobDiscarded(ErrorResult&) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCallback);
+
+    mCallback->UnregisterFailed();
+    mCallback = nullptr;
+  }
+
+  NS_INLINE_DECL_REFCOUNTING(UnregisterJobCallback, override)
+};
+
+}  // anonymous namespace
+
+NS_IMETHODIMP
+ServiceWorkerManager::Unregister(nsIPrincipal* aPrincipal,
+                                 nsIServiceWorkerUnregisterCallback* aCallback,
+                                 const nsAString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aPrincipal) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsresult rv;
+
+// This is not accessible by content, and callers should always ensure scope is
+// a correct URI, so this is wrapped in DEBUG
+#ifdef DEBUG
+  nsCOMPtr<nsIURI> scopeURI;
+  rv = NS_NewURI(getter_AddRefs(scopeURI), aScope);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+#endif
+
+  nsAutoCString scopeKey;
+  rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  NS_ConvertUTF16toUTF8 scope(aScope);
+  RefPtr<ServiceWorkerJobQueue> queue = GetOrCreateJobQueue(scopeKey, scope);
+
+  RefPtr<ServiceWorkerUnregisterJob> job =
+      new ServiceWorkerUnregisterJob(aPrincipal, scope);
+
+  if (aCallback) {
+    RefPtr<UnregisterJobCallback> cb = new UnregisterJobCallback(aCallback);
+    job->AppendResultCallback(cb);
+  }
+
+  queue->ScheduleJob(job);
+  return NS_OK;
+}
+
+void ServiceWorkerManager::WorkerIsIdle(ServiceWorkerInfo* aWorker) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aWorker);
+
+  RefPtr<ServiceWorkerRegistrationInfo> reg =
+      GetRegistration(aWorker->Principal(), aWorker->Scope());
+  if (!reg) {
+    return;
+  }
+
+  if (reg->GetActive() != aWorker) {
+    return;
+  }
+
+  reg->TryToActivateAsync();
+}
+
+already_AddRefed<ServiceWorkerJobQueue>
+ServiceWorkerManager::GetOrCreateJobQueue(const nsACString& aKey,
+                                          const nsACString& aScope) {
+  MOZ_ASSERT(!aKey.IsEmpty());
+  ServiceWorkerManager::RegistrationDataPerPrincipal* data;
+  // XXX we could use WithEntryHandle here to avoid a hashtable lookup, except
+  // that leads to a false positive assertion, see bug 1370674 comment 7.
+  if (!mRegistrationInfos.Get(aKey, &data)) {
+    data = mRegistrationInfos
+               .InsertOrUpdate(aKey, MakeUnique<RegistrationDataPerPrincipal>())
+               .get();
+  }
+
+  RefPtr queue = data->mJobQueues.GetOrInsertNew(aScope);
+  return queue.forget();
+}
+
+/* static */
+already_AddRefed<ServiceWorkerManager> ServiceWorkerManager::GetInstance() {
+  if (!gInstance) {
+    RefPtr<ServiceWorkerRegistrar> swr;
+
+    // XXX: Substitute this with an assertion. See comment in Init.
+    if (XRE_IsParentProcess()) {
+      // Don't (re-)create the ServiceWorkerManager if we are already shutting
+      // down.
+      if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+        return nullptr;
+      }
+      // Don't create the ServiceWorkerManager until the ServiceWorkerRegistrar
+      // is initialized.
+      swr = ServiceWorkerRegistrar::Get();
+      if (!swr) {
+        return nullptr;
+      }
+    }
+
+    MOZ_ASSERT(NS_IsMainThread());
+
+    gInstance = new ServiceWorkerManager();
+    gInstance->Init(swr);
+    ClearOnShutdown(&gInstance);
+  }
+  RefPtr<ServiceWorkerManager> copy = gInstance.get();
+  return copy.forget();
+}
+
+void ServiceWorkerManager::ReportToAllClients(
+    const nsCString& aScope, const nsString& aMessage,
+    const nsString& aFilename, const nsString& aLine, uint32_t aLineNumber,
+    uint32_t aColumnNumber, uint32_t aFlags) {
+  ConsoleUtils::ReportForServiceWorkerScope(
+      NS_ConvertUTF8toUTF16(aScope), aMessage, aFilename, aLineNumber,
+      aColumnNumber, ConsoleUtils::eError);
+}
+
+/* static */
+void ServiceWorkerManager::LocalizeAndReportToAllClients(
+    const nsCString& aScope, const char* aStringKey,
+    const nsTArray<nsString>& aParamArray, uint32_t aFlags,
+    const nsString& aFilename, const nsString& aLine, uint32_t aLineNumber,
+    uint32_t aColumnNumber) {
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    return;
+  }
+
+  nsresult rv;
+  nsAutoString message;
+  rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES,
+                                             aStringKey, aParamArray, message);
+  if (NS_SUCCEEDED(rv)) {
+    swm->ReportToAllClients(aScope, message, aFilename, aLine, aLineNumber,
+                            aColumnNumber, aFlags);
+  } else {
+    NS_WARNING("Failed to format and therefore report localized error.");
+  }
+}
+
+void ServiceWorkerManager::HandleError(
+    JSContext* aCx, nsIPrincipal* aPrincipal, const nsCString& aScope,
+    const nsString& aWorkerURL, const nsString& aMessage,
+    const nsString& aFilename, const nsString& aLine, uint32_t aLineNumber,
+    uint32_t aColumnNumber, uint32_t aFlags, JSExnType aExnType) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  ServiceWorkerManager::RegistrationDataPerPrincipal* data;
+  if (NS_WARN_IF(!mRegistrationInfos.Get(scopeKey, &data))) {
+    return;
+  }
+
+  // Always report any uncaught exceptions or errors to the console of
+  // each client.
+  ReportToAllClients(aScope, aMessage, aFilename, aLine, aLineNumber,
+                     aColumnNumber, aFlags);
+}
+
+void ServiceWorkerManager::PurgeServiceWorker(
+    const ServiceWorkerRegistrationData& aRegistration,
+    nsIPrincipal* aPrincipal) {
+  MOZ_ASSERT(mActor);
+  serviceWorkerScriptCache::PurgeCache(aPrincipal, aRegistration.cacheName());
+  MaybeSendUnregister(aPrincipal, aRegistration.scope());
+}
+
+void ServiceWorkerManager::LoadRegistration(
+    const ServiceWorkerRegistrationData& aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  auto principalOrErr = PrincipalInfoToPrincipal(aRegistration.principal());
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return;
+  }
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+
+  if (!StaticPrefs::dom_serviceWorkers_enabled()) {
+    // If service workers are disabled, remove the registration from disk
+    // instead of loading.
+    PurgeServiceWorker(aRegistration, principal);
+    return;
+  }
+
+  // Purge extensions registrations if they are disabled by prefs.
+  if (!StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup()) {
+    nsCOMPtr<nsIURI> uri = principal->GetURI();
+
+    // We do check the URI scheme here because when this is going to run
+    // the extension may not have been loaded yet and the WebExtensionPolicy
+    // may not exist yet.
+    if (uri->SchemeIs("moz-extension")) {
+      PurgeServiceWorker(aRegistration, principal);
+      return;
+    }
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetRegistration(principal, aRegistration.scope());
+  if (!registration) {
+    registration =
+        CreateNewRegistration(aRegistration.scope(), principal,
+                              static_cast<ServiceWorkerUpdateViaCache>(
+                                  aRegistration.updateViaCache()),
+                              aRegistration.navigationPreloadState());
+  } else {
+    // If active worker script matches our expectations for a "current worker",
+    // then we are done. Since scripts with the same URL might have different
+    // contents such as updated scripts or scripts with different LoadFlags, we
+    // use the CacheName to judge whether the two scripts are identical, where
+    // the CacheName is an UUID generated when a new script is found.
+    if (registration->GetActive() &&
+        registration->GetActive()->CacheName() == aRegistration.cacheName()) {
+      // No needs for updates.
+      return;
+    }
+  }
+
+  registration->SetLastUpdateTime(aRegistration.lastUpdateTime());
+
+  nsLoadFlags importsLoadFlags = nsIChannel::LOAD_BYPASS_SERVICE_WORKER;
+  if (aRegistration.updateViaCache() !=
+      static_cast<uint16_t>(ServiceWorkerUpdateViaCache::None)) {
+    importsLoadFlags |= nsIRequest::VALIDATE_ALWAYS;
+  }
+
+  const nsCString& currentWorkerURL = aRegistration.currentWorkerURL();
+  if (!currentWorkerURL.IsEmpty()) {
+    registration->SetActive(new ServiceWorkerInfo(
+        registration->Principal(), registration->Scope(), registration->Id(),
+        registration->Version(), currentWorkerURL, aRegistration.cacheName(),
+        importsLoadFlags));
+    registration->GetActive()->SetHandlesFetch(
+        aRegistration.currentWorkerHandlesFetch());
+    registration->GetActive()->SetInstalledTime(
+        aRegistration.currentWorkerInstalledTime());
+    registration->GetActive()->SetActivatedTime(
+        aRegistration.currentWorkerActivatedTime());
+  }
+}
+
+void ServiceWorkerManager::LoadRegistrations(
+    const nsTArray<ServiceWorkerRegistrationData>& aRegistrations) {
+  MOZ_ASSERT(NS_IsMainThread());
+  uint32_t fetch = 0;
+  for (uint32_t i = 0, len = aRegistrations.Length(); i < len; ++i) {
+    LoadRegistration(aRegistrations[i]);
+    if (aRegistrations[i].currentWorkerHandlesFetch()) {
+      fetch++;
+    }
+  }
+  gServiceWorkersRegistered = aRegistrations.Length();
+  gServiceWorkersRegisteredFetch = fetch;
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"All"_ns, gServiceWorkersRegistered);
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"Fetch"_ns, gServiceWorkersRegisteredFetch);
+  LOG(("LoadRegistrations: %u, fetch %u\n", gServiceWorkersRegistered,
+       gServiceWorkersRegisteredFetch));
+}
+
+void ServiceWorkerManager::StoreRegistration(
+    nsIPrincipal* aPrincipal, ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aRegistration);
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  // Do not store a registration for addons that are not installed, not enabled
+  // or installed temporarily.
+  //
+  // If the dom.serviceWorkers.testing.persistTemporaryInstalledAddons is set
+  // to true, the registration for a temporary installed addon will still be
+  // persisted (only meant to be used to make it easier to test some particular
+  // scenario with a temporary installed addon which doesn't need to be signed
+  // to be installed on release channel builds).
+  if (aPrincipal->SchemeIs("moz-extension")) {
+    RefPtr<extensions::WebExtensionPolicy> addonPolicy =
+        BasePrincipal::Cast(aPrincipal)->AddonPolicy();
+    if (!addonPolicy || !addonPolicy->Active() ||
+        (addonPolicy->TemporarilyInstalled() &&
+         !StaticPrefs::
+             dom_serviceWorkers_testing_persistTemporarilyInstalledAddons())) {
+      return;
+    }
+  }
+
+  ServiceWorkerRegistrationData data;
+  nsresult rv = PopulateRegistrationData(aPrincipal, aRegistration, data);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  PrincipalInfo principalInfo;
+  if (NS_WARN_IF(
+          NS_FAILED(PrincipalToPrincipalInfo(aPrincipal, &principalInfo)))) {
+    return;
+  }
+
+  mActor->SendRegister(data);
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetServiceWorkerRegistrationInfo(
+    const ClientInfo& aClientInfo) const {
+  auto principalOrErr = aClientInfo.GetPrincipal();
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), aClientInfo.URL());
+  NS_ENSURE_SUCCESS(rv, nullptr);
+
+  return GetServiceWorkerRegistrationInfo(principal, uri);
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetServiceWorkerRegistrationInfo(nsIPrincipal* aPrincipal,
+                                                       nsIURI* aURI) const {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aURI);
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  return GetServiceWorkerRegistrationInfo(scopeKey, aURI);
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetServiceWorkerRegistrationInfo(
+    const nsACString& aScopeKey, nsIURI* aURI) const {
+  MOZ_ASSERT(aURI);
+
+  nsAutoCString spec;
+  nsresult rv = aURI->GetSpec(spec);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  nsAutoCString scope;
+  RegistrationDataPerPrincipal* data;
+  if (!FindScopeForPath(aScopeKey, spec, &data, scope)) {
+    return nullptr;
+  }
+
+  MOZ_ASSERT(data);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration;
+  data->mInfos.Get(scope, getter_AddRefs(registration));
+  // ordered scopes and registrations better be in sync.
+  MOZ_ASSERT(registration);
+
+#ifdef DEBUG
+  nsAutoCString origin;
+  rv = registration->Principal()->GetOrigin(origin);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  MOZ_ASSERT(origin.Equals(aScopeKey));
+#endif
+
+  return registration.forget();
+}
+
+/* static */
+nsresult ServiceWorkerManager::PrincipalToScopeKey(nsIPrincipal* aPrincipal,
+                                                   nsACString& aKey) {
+  MOZ_ASSERT(aPrincipal);
+
+  if (!BasePrincipal::Cast(aPrincipal)->IsContentPrincipal()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsresult rv = aPrincipal->GetOrigin(aKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+/* static */
+nsresult ServiceWorkerManager::PrincipalInfoToScopeKey(
+    const PrincipalInfo& aPrincipalInfo, nsACString& aKey) {
+  if (aPrincipalInfo.type() != PrincipalInfo::TContentPrincipalInfo) {
+    return NS_ERROR_FAILURE;
+  }
+
+  auto content = aPrincipalInfo.get_ContentPrincipalInfo();
+
+  nsAutoCString suffix;
+  content.attrs().CreateSuffix(suffix);
+
+  aKey = content.originNoSuffix();
+  aKey.Append(suffix);
+
+  return NS_OK;
+}
+
+/* static */
+void ServiceWorkerManager::AddScopeAndRegistration(
+    const nsACString& aScope, ServiceWorkerRegistrationInfo* aInfo) {
+  MOZ_ASSERT(aInfo);
+  MOZ_ASSERT(aInfo->Principal());
+  MOZ_ASSERT(!aInfo->IsUnregistered());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // browser shutdown
+    return;
+  }
+
+  nsAutoCString scopeKey;
+  nsresult rv = swm->PrincipalToScopeKey(aInfo->Principal(), scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  MOZ_ASSERT(!scopeKey.IsEmpty());
+
+  auto* const data = swm->mRegistrationInfos.GetOrInsertNew(scopeKey);
+  data->mScopeContainer.InsertScope(aScope);
+  data->mInfos.InsertOrUpdate(aScope, RefPtr{aInfo});
+  swm->NotifyListenersOnRegister(aInfo);
+}
+
+/* static */
+bool ServiceWorkerManager::FindScopeForPath(
+    const nsACString& aScopeKey, const nsACString& aPath,
+    RegistrationDataPerPrincipal** aData, nsACString& aMatch) {
+  MOZ_ASSERT(aData);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+  if (!swm || !swm->mRegistrationInfos.Get(aScopeKey, aData)) {
+    return false;
+  }
+
+  Maybe<nsCString> scope = (*aData)->mScopeContainer.MatchScope(aPath);
+
+  if (scope) {
+    // scope.isSome() will still truen true after this; we are just moving the
+    // string inside the Maybe, so the Maybe will contain an empty string.
+    aMatch = std::move(*scope);
+  }
+
+  return scope.isSome();
+}
+
+/* static */
+bool ServiceWorkerManager::HasScope(nsIPrincipal* aPrincipal,
+                                    const nsACString& aScope) {
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    return false;
+  }
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!swm->mRegistrationInfos.Get(scopeKey, &data)) {
+    return false;
+  }
+
+  return data->mScopeContainer.Contains(aScope);
+}
+
+/* static */
+void ServiceWorkerManager::RemoveScopeAndRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    return;
+  }
+
+  nsAutoCString scopeKey;
+  nsresult rv = swm->PrincipalToScopeKey(aRegistration->Principal(), scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!swm->mRegistrationInfos.Get(scopeKey, &data)) {
+    return;
+  }
+
+  if (auto entry = data->mUpdateTimers.Lookup(aRegistration->Scope())) {
+    entry.Data()->Cancel();
+    entry.Remove();
+  }
+
+  // Verify there are no controlled clients for the purged registration.
+  for (auto iter = swm->mControlledClients.Iter(); !iter.Done(); iter.Next()) {
+    auto& reg = iter.UserData()->mRegistrationInfo;
+    if (reg->Scope().Equals(aRegistration->Scope()) &&
+        reg->Principal()->Equals(aRegistration->Principal()) &&
+        reg->IsCorrupt()) {
+      iter.Remove();
+    }
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> info;
+  data->mInfos.Remove(aRegistration->Scope(), getter_AddRefs(info));
+  aRegistration->SetUnregistered();
+  data->mScopeContainer.RemoveScope(aRegistration->Scope());
+  swm->NotifyListenersOnUnregister(info);
+
+  swm->MaybeRemoveRegistrationInfo(scopeKey);
+}
+
+void ServiceWorkerManager::MaybeRemoveRegistrationInfo(
+    const nsACString& aScopeKey) {
+  if (auto entry = mRegistrationInfos.Lookup(aScopeKey)) {
+    if (entry.Data()->mScopeContainer.IsEmpty() &&
+        entry.Data()->mJobQueues.Count() == 0) {
+      entry.Remove();
+
+      // Need to reset the mQuotaUsageCheckCount, if
+      // RegistrationDataPerPrincipal:: mScopeContainer is empty. This
+      // RegistrationDataPerPrincipal might be reused, such that quota usage
+      // mitigation can be triggered for the new added registration.
+    } else if (entry.Data()->mScopeContainer.IsEmpty() &&
+               entry.Data()->mQuotaUsageCheckCount) {
+      entry.Data()->mQuotaUsageCheckCount = 0;
+    }
+  }
+}
+
+bool ServiceWorkerManager::StartControlling(
+    const ClientInfo& aClientInfo,
+    const ServiceWorkerDescriptor& aServiceWorker) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  auto principalOrErr =
+      PrincipalInfoToPrincipal(aServiceWorker.PrincipalInfo());
+
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return false;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+
+  nsCOMPtr<nsIURI> scope;
+  nsresult rv = NS_NewURI(getter_AddRefs(scope), aServiceWorker.Scope());
+  NS_ENSURE_SUCCESS(rv, false);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetServiceWorkerRegistrationInfo(principal, scope);
+  NS_ENSURE_TRUE(registration, false);
+  NS_ENSURE_TRUE(registration->GetActive(), false);
+
+  StartControllingClient(aClientInfo, registration);
+
+  return true;
+}
+
+void ServiceWorkerManager::MaybeCheckNavigationUpdate(
+    const ClientInfo& aClientInfo) {
+  MOZ_ASSERT(NS_IsMainThread());
+  // We perform these success path navigation update steps when the
+  // document tells us its more or less done loading.  This avoids
+  // slowing down page load and also lets pages consistently get
+  // updatefound events when they fire.
+  //
+  // 9.8.20 If respondWithEntered is false, then:
+  // 9.8.22 Else: (respondWith was entered and succeeded)
+  //    If request is a non-subresource request, then: Invoke Soft Update
+  //    algorithm.
+  ControlledClientData* data = mControlledClients.Get(aClientInfo.Id());
+  if (data && data->mRegistrationInfo) {
+    data->mRegistrationInfo->MaybeScheduleUpdate();
+  }
+}
+
+void ServiceWorkerManager::StopControllingRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  aRegistration->StopControllingClient();
+  if (aRegistration->IsControllingClients()) {
+    return;
+  }
+
+  if (aRegistration->IsUnregistered()) {
+    if (aRegistration->IsIdle()) {
+      aRegistration->Clear();
+    } else {
+      aRegistration->ClearWhenIdle();
+    }
+    return;
+  }
+
+  // We use to aggressively terminate the worker at this point, but it
+  // caused problems.  There are more uses for a service worker than actively
+  // controlled documents.  We need to let the worker naturally terminate
+  // in case its handling push events, message events, etc.
+  aRegistration->TryToActivateAsync();
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::GetScopeForUrl(nsIPrincipal* aPrincipal,
+                                     const nsAString& aUrl, nsAString& aScope) {
+  MOZ_ASSERT(aPrincipal);
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), aUrl);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> r =
+      GetServiceWorkerRegistrationInfo(aPrincipal, uri);
+  if (!r) {
+    return NS_ERROR_FAILURE;
+  }
+
+  CopyUTF8toUTF16(r->Scope(), aScope);
+  return NS_OK;
+}
+
+namespace {
+
+class ContinueDispatchFetchEventRunnable : public Runnable {
+  RefPtr<ServiceWorkerPrivate> mServiceWorkerPrivate;
+  nsCOMPtr<nsIInterceptedChannel> mChannel;
+  nsCOMPtr<nsILoadGroup> mLoadGroup;
+
+ public:
+  ContinueDispatchFetchEventRunnable(
+      ServiceWorkerPrivate* aServiceWorkerPrivate,
+      nsIInterceptedChannel* aChannel, nsILoadGroup* aLoadGroup)
+      : Runnable(
+            "dom::ServiceWorkerManager::ContinueDispatchFetchEventRunnable"),
+        mServiceWorkerPrivate(aServiceWorkerPrivate),
+        mChannel(aChannel),
+        mLoadGroup(aLoadGroup) {
+    MOZ_ASSERT(aServiceWorkerPrivate);
+    MOZ_ASSERT(aChannel);
+  }
+
+  void HandleError() {
+    MOZ_ASSERT(NS_IsMainThread());
+    NS_WARNING("Unexpected error while dispatching fetch event!");
+    nsresult rv = mChannel->ResetInterception(false);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Failed to resume intercepted network request");
+      mChannel->CancelInterception(rv);
+    }
+  }
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsCOMPtr<nsIChannel> channel;
+    nsresult rv = mChannel->GetChannel(getter_AddRefs(channel));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      HandleError();
+      return NS_OK;
+    }
+
+    // The channel might have encountered an unexpected error while ensuring
+    // the upload stream is cloneable.  Check here and reset the interception
+    // if that happens.
+    nsresult status;
+    rv = channel->GetStatus(&status);
+    if (NS_WARN_IF(NS_FAILED(rv) || NS_FAILED(status))) {
+      HandleError();
+      return NS_OK;
+    }
+
+    nsString clientId;
+    nsString resultingClientId;
+    nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo();
+    Maybe<ClientInfo> clientInfo = loadInfo->GetClientInfo();
+    if (clientInfo.isSome()) {
+      clientId = NSID_TrimBracketsUTF16(clientInfo->Id());
+    }
+
+    // Having an initial or reserved client are mutually exclusive events:
+    // either an initial client is used upon navigating an about:blank
+    // iframe, or a new, reserved environment/client is created (e.g.
+    // upon a top-level navigation). See step 4 of
+    // https://html.spec.whatwg.org/#process-a-navigate-fetch as well as
+    // https://github.com/w3c/ServiceWorker/issues/1228#issuecomment-345132444
+    Maybe<ClientInfo> resulting = loadInfo->GetInitialClientInfo();
+
+    if (resulting.isNothing()) {
+      resulting = loadInfo->GetReservedClientInfo();
+    } else {
+      MOZ_ASSERT(loadInfo->GetReservedClientInfo().isNothing());
+    }
+
+    if (resulting.isSome()) {
+      resultingClientId = NSID_TrimBracketsUTF16(resulting->Id());
+    }
+
+    rv = mServiceWorkerPrivate->SendFetchEvent(mChannel, mLoadGroup, clientId,
+                                               resultingClientId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      HandleError();
+    }
+
+    return NS_OK;
+  }
+};
+
+}  // anonymous namespace
+
+void ServiceWorkerManager::DispatchFetchEvent(nsIInterceptedChannel* aChannel,
+                                              ErrorResult& aRv) {
+  MOZ_ASSERT(aChannel);
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  nsCOMPtr<nsIChannel> internalChannel;
+  aRv = aChannel->GetChannel(getter_AddRefs(internalChannel));
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  aRv = internalChannel->GetLoadGroup(getter_AddRefs(loadGroup));
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  nsCOMPtr<nsILoadInfo> loadInfo = internalChannel->LoadInfo();
+  RefPtr<ServiceWorkerInfo> serviceWorker;
+
+  if (!nsContentUtils::IsNonSubresourceRequest(internalChannel)) {
+    const Maybe<ServiceWorkerDescriptor>& controller =
+        loadInfo->GetController();
+    if (NS_WARN_IF(controller.isNothing())) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    RefPtr<ServiceWorkerRegistrationInfo> registration;
+    nsresult rv = GetClientRegistration(loadInfo->GetClientInfo().ref(),
+                                        getter_AddRefs(registration));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      aRv.Throw(rv);
+      return;
+    }
+
+    serviceWorker = registration->GetActive();
+    if (NS_WARN_IF(!serviceWorker) ||
+        NS_WARN_IF(serviceWorker->Descriptor().Id() != controller.ref().Id())) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+  } else {
+    nsCOMPtr<nsIURI> uri;
+    aRv = aChannel->GetSecureUpgradedChannelURI(getter_AddRefs(uri));
+    if (NS_WARN_IF(aRv.Failed())) {
+      return;
+    }
+
+    // non-subresource request means the URI contains the principal
+    OriginAttributes attrs = loadInfo->GetOriginAttributes();
+    if (StaticPrefs::privacy_partition_serviceWorkers()) {
+      StoragePrincipalHelper::GetOriginAttributes(
+          internalChannel, attrs,
+          StoragePrincipalHelper::eForeignPartitionedPrincipal);
+    }
+
+    nsCOMPtr<nsIPrincipal> principal =
+        BasePrincipal::CreateContentPrincipal(uri, attrs);
+
+    RefPtr<ServiceWorkerRegistrationInfo> registration =
+        GetServiceWorkerRegistrationInfo(principal, uri);
+    if (NS_WARN_IF(!registration)) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    // While we only enter this method if IsAvailable() previously saw
+    // an active worker, it is possible for that worker to be removed
+    // before we get to this point.  Therefore we must handle a nullptr
+    // active worker here.
+    serviceWorker = registration->GetActive();
+    if (NS_WARN_IF(!serviceWorker)) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    // If there is a reserved client it should be marked as controlled before
+    // the FetchEvent is dispatched.
+    Maybe<ClientInfo> clientInfo = loadInfo->GetReservedClientInfo();
+
+    // Also override the initial about:blank controller since the real
+    // network load may be intercepted by a different service worker.  If
+    // the intial about:blank has a controller here its simply been
+    // inherited from its parent.
+    if (clientInfo.isNothing()) {
+      clientInfo = loadInfo->GetInitialClientInfo();
+
+      // TODO: We need to handle the case where the initial about:blank is
+      //       controlled, but the final document load is not.  Right now
+      //       the spec does not really say what to do.  There currently
+      //       is no way for the controller to be cleared from a client in
+      //       the spec or our implementation.  We may want to force a
+      //       new inner window to be created instead of reusing the
+      //       initial about:blank global.  See bug 1419620 and the spec
+      //       issue here: https://github.com/w3c/ServiceWorker/issues/1232
+    }
+
+    if (clientInfo.isSome()) {
+      // ClientChannelHelper is not called for STS upgrades that get
+      // intercepted by a service worker when interception occurs in
+      // the content process.  Therefore the reserved client is not
+      // properly cleared in that case leading to a situation where
+      // a ClientSource with an http:// principal is controlled by
+      // a ServiceWorker with an https:// principal.
+      //
+      // This does not occur when interception is handled by the
+      // simpler InterceptedHttpChannel approach in the parent.
+      //
+      // As a temporary work around check for this principal mismatch
+      // here and perform the ClientChannelHelper's replacement of
+      // reserved client automatically.
+      if (!XRE_IsParentProcess()) {
+        auto clientPrincipalOrErr = clientInfo.ref().GetPrincipal();
+
+        nsCOMPtr<nsIPrincipal> clientPrincipal;
+        if (clientPrincipalOrErr.isOk()) {
+          clientPrincipal = clientPrincipalOrErr.unwrap();
+        }
+
+        if (!clientPrincipal || !clientPrincipal->Equals(principal)) {
+          UniquePtr<ClientSource> reservedClient =
+              loadInfo->TakeReservedClientSource();
+
+          nsCOMPtr<nsISerialEventTarget> target =
+              reservedClient ? reservedClient->EventTarget()
+                             : GetMainThreadSerialEventTarget();
+
+          reservedClient.reset();
+          reservedClient = ClientManager::CreateSource(ClientType::Window,
+                                                       target, principal);
+
+          loadInfo->GiveReservedClientSource(std::move(reservedClient));
+
+          clientInfo = loadInfo->GetReservedClientInfo();
+        }
+      }
+
+      // First, attempt to mark the reserved client controlled directly.  This
+      // will update the controlled status in the ClientManagerService in the
+      // parent.  It will also eventually propagate back to the ClientSource.
+      StartControllingClient(clientInfo.ref(), registration);
+    }
+
+    uint32_t redirectMode = nsIHttpChannelInternal::REDIRECT_MODE_MANUAL;
+    nsCOMPtr<nsIHttpChannelInternal> http = do_QueryInterface(internalChannel);
+    MOZ_ALWAYS_SUCCEEDS(http->GetRedirectMode(&redirectMode));
+
+    // Synthetic redirects for non-subresource requests with a "follow"
+    // redirect mode may switch controllers.  This is basically worker
+    // scripts right now.  In this case we need to explicitly clear the
+    // controller to avoid assertions on the SetController() below.
+    if (redirectMode == nsIHttpChannelInternal::REDIRECT_MODE_FOLLOW) {
+      loadInfo->ClearController();
+    }
+
+    // But we also note the reserved state on the LoadInfo.  This allows the
+    // ClientSource to be updated immediately after the nsIChannel starts.
+    // This is necessary to have the correct controller in place for immediate
+    // follow-on requests.
+    loadInfo->SetController(serviceWorker->Descriptor());
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(serviceWorker);
+
+  RefPtr<ContinueDispatchFetchEventRunnable> continueRunnable =
+      new ContinueDispatchFetchEventRunnable(serviceWorker->WorkerPrivate(),
+                                             aChannel, loadGroup);
+
+  // When this service worker was registered, we also sent down the permissions
+  // for the runnable. They should have arrived by now, but we still need to
+  // wait for them if they have not.
+  RefPtr<PermissionManager> permMgr = PermissionManager::GetInstance();
+  if (permMgr) {
+    permMgr->WhenPermissionsAvailable(serviceWorker->Principal(),
+                                      continueRunnable);
+  } else {
+    continueRunnable->HandleError();
+  }
+}
+
+bool ServiceWorkerManager::IsAvailable(nsIPrincipal* aPrincipal, nsIURI* aURI,
+                                       nsIChannel* aChannel) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aURI);
+  MOZ_ASSERT(aChannel);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetServiceWorkerRegistrationInfo(aPrincipal, aURI);
+
+  if (!registration || !registration->GetActive()) {
+    return false;
+  }
+
+  // Checking if the matched service worker handles fetch events or not.
+  // If it does, directly return true and handle the client controlling logic
+  // in DispatchFetchEvent(). otherwise, do followings then return false.
+  // 1. Set the matched service worker as the controller of LoadInfo and
+  //    correspoinding ClinetInfo
+  // 2. Maybe schedule a soft update
+  if (!registration->GetActive()->HandlesFetch()) {
+    // Checkin if the channel is not allowed for the service worker.
+    auto storageAccess = StorageAllowedForChannel(aChannel);
+    nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
+
+    if (storageAccess != StorageAccess::eAllow) {
+      if (!StaticPrefs::privacy_partition_serviceWorkers()) {
+        return false;
+      }
+
+      nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
+      loadInfo->GetCookieJarSettings(getter_AddRefs(cookieJarSettings));
+
+      if (!StoragePartitioningEnabled(storageAccess, cookieJarSettings)) {
+        return false;
+      }
+    }
+
+    // ServiceWorkerInterceptController::ShouldPrepareForIntercept() handles the
+    // subresource cases. Must be non-subresource case here.
+    MOZ_ASSERT(nsContentUtils::IsNonSubresourceRequest(aChannel));
+
+    Maybe<ClientInfo> clientInfo = loadInfo->GetReservedClientInfo();
+    if (clientInfo.isNothing()) {
+      clientInfo = loadInfo->GetInitialClientInfo();
+    }
+
+    if (clientInfo.isSome()) {
+      StartControllingClient(clientInfo.ref(), registration);
+    }
+
+    uint32_t redirectMode = nsIHttpChannelInternal::REDIRECT_MODE_MANUAL;
+    nsCOMPtr<nsIHttpChannelInternal> http = do_QueryInterface(aChannel);
+    MOZ_ALWAYS_SUCCEEDS(http->GetRedirectMode(&redirectMode));
+
+    // Synthetic redirects for non-subresource requests with a "follow"
+    // redirect mode may switch controllers.  This is basically worker
+    // scripts right now.  In this case we need to explicitly clear the
+    // controller to avoid assertions on the SetController() below.
+    if (redirectMode == nsIHttpChannelInternal::REDIRECT_MODE_FOLLOW) {
+      loadInfo->ClearController();
+    }
+
+    loadInfo->SetController(registration->GetActive()->Descriptor());
+
+    // https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm 17.1
+    // try schedule a soft-update for non-subresource case.
+    registration->MaybeScheduleUpdate();
+    return false;
+  }
+  // Found a matching service worker which handles fetch events, return true.
+  return true;
+}
+
+nsresult ServiceWorkerManager::GetClientRegistration(
+    const ClientInfo& aClientInfo,
+    ServiceWorkerRegistrationInfo** aRegistrationInfo) {
+  ControlledClientData* data = mControlledClients.Get(aClientInfo.Id());
+  if (!data || !data->mRegistrationInfo) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // If the document is controlled, the current worker MUST be non-null.
+  if (!data->mRegistrationInfo->GetActive()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> ref = data->mRegistrationInfo;
+  ref.forget(aRegistrationInfo);
+  return NS_OK;
+}
+
+int32_t ServiceWorkerManager::GetPrincipalQuotaUsageCheckCount(
+    nsIPrincipal* aPrincipal) {
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return -1;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!mRegistrationInfos.Get(scopeKey, &data)) {
+    return -1;
+  }
+
+  return data->mQuotaUsageCheckCount;
+}
+
+void ServiceWorkerManager::CheckPrincipalQuotaUsage(nsIPrincipal* aPrincipal,
+                                                    const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!mRegistrationInfos.Get(scopeKey, &data)) {
+    return;
+  }
+
+  // Had already schedule a quota usage check.
+  if (data->mQuotaUsageCheckCount != 0) {
+    return;
+  }
+
+  ++data->mQuotaUsageCheckCount;
+
+  // Get the corresponding ServiceWorkerRegistrationInfo here. Unregisteration
+  // might be triggered later, should get it here before it be removed from
+  // data.mInfos, such that NotifyListenersOnQuotaCheckFinish() can notify the
+  // corresponding ServiceWorkerRegistrationInfo after asynchronous quota
+  // checking finish.
+  RefPtr<ServiceWorkerRegistrationInfo> info;
+  data->mInfos.Get(aScope, getter_AddRefs(info));
+  MOZ_ASSERT(info);
+
+  RefPtr<ServiceWorkerManager> self = this;
+
+  ClearQuotaUsageIfNeeded(aPrincipal, [self, info](bool aResult) {
+    MOZ_ASSERT(NS_IsMainThread());
+    self->NotifyListenersOnQuotaUsageCheckFinish(info);
+  });
+}
+
+void ServiceWorkerManager::SoftUpdate(const OriginAttributes& aOriginAttributes,
+                                      const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  SoftUpdateInternal(aOriginAttributes, aScope, nullptr);
+}
+
+namespace {
+
+class UpdateJobCallback final : public ServiceWorkerJob::Callback {
+  RefPtr<ServiceWorkerUpdateFinishCallback> mCallback;
+
+  ~UpdateJobCallback() { MOZ_ASSERT(!mCallback); }
+
+ public:
+  explicit UpdateJobCallback(ServiceWorkerUpdateFinishCallback* aCallback)
+      : mCallback(aCallback) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCallback);
+  }
+
+  void JobFinished(ServiceWorkerJob* aJob, ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aJob);
+    MOZ_ASSERT(mCallback);
+
+    auto scopeExit = MakeScopeExit([&]() { mCallback = nullptr; });
+
+    if (aStatus.Failed()) {
+      mCallback->UpdateFailed(aStatus);
+      return;
+    }
+
+    MOZ_DIAGNOSTIC_ASSERT(aJob->GetType() == ServiceWorkerJob::Type::Update);
+    RefPtr<ServiceWorkerUpdateJob> updateJob =
+        static_cast<ServiceWorkerUpdateJob*>(aJob);
+    RefPtr<ServiceWorkerRegistrationInfo> reg = updateJob->GetRegistration();
+    mCallback->UpdateSucceeded(reg);
+  }
+
+  void JobDiscarded(ErrorResult& aStatus) override {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCallback);
+
+    mCallback->UpdateFailed(aStatus);
+    mCallback = nullptr;
+  }
+
+  NS_INLINE_DECL_REFCOUNTING(UpdateJobCallback, override)
+};
+
+}  // anonymous namespace
+
+void ServiceWorkerManager::SoftUpdateInternal(
+    const OriginAttributes& aOriginAttributes, const nsACString& aScope,
+    ServiceWorkerUpdateFinishCallback* aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  auto result = ScopeToPrincipal(aScope, aOriginAttributes);
+  if (NS_WARN_IF(result.isErr())) {
+    return;
+  }
+
+  auto principal = result.unwrap();
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(principal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetRegistration(scopeKey, aScope);
+  if (NS_WARN_IF(!registration)) {
+    return;
+  }
+
+  // "If registration's installing worker is not null, abort these steps."
+  if (registration->GetInstalling()) {
+    return;
+  }
+
+  // "Let newestWorker be the result of running Get Newest Worker algorithm
+  // passing registration as its argument.
+  // If newestWorker is null, abort these steps."
+  RefPtr<ServiceWorkerInfo> newest = registration->Newest();
+  if (!newest) {
+    return;
+  }
+
+  // "If the registration queue for registration is empty, invoke Update
+  // algorithm, or its equivalent, with client, registration as its argument."
+  // TODO(catalinb): We don't implement the force bypass cache flag.
+  // See: https://github.com/slightlyoff/ServiceWorker/issues/759
+  RefPtr<ServiceWorkerJobQueue> queue = GetOrCreateJobQueue(scopeKey, aScope);
+
+  RefPtr<ServiceWorkerUpdateJob> job = new ServiceWorkerUpdateJob(
+      principal, registration->Scope(), newest->ScriptSpec(),
+      registration->GetUpdateViaCache());
+
+  if (aCallback) {
+    RefPtr<UpdateJobCallback> cb = new UpdateJobCallback(aCallback);
+    job->AppendResultCallback(cb);
+  }
+
+  queue->ScheduleJob(job);
+}
+
+void ServiceWorkerManager::Update(
+    nsIPrincipal* aPrincipal, const nsACString& aScope,
+    nsCString aNewestWorkerScriptUrl,
+    ServiceWorkerUpdateFinishCallback* aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!aNewestWorkerScriptUrl.IsEmpty());
+
+  UpdateInternal(aPrincipal, aScope, std::move(aNewestWorkerScriptUrl),
+                 aCallback);
+}
+
+void ServiceWorkerManager::UpdateInternal(
+    nsIPrincipal* aPrincipal, const nsACString& aScope,
+    nsCString&& aNewestWorkerScriptUrl,
+    ServiceWorkerUpdateFinishCallback* aCallback) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aCallback);
+  MOZ_ASSERT(!aNewestWorkerScriptUrl.IsEmpty());
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetRegistration(scopeKey, aScope);
+  if (NS_WARN_IF(!registration)) {
+    ErrorResult error;
+    error.ThrowTypeError<MSG_SW_UPDATE_BAD_REGISTRATION>(aScope, "uninstalled");
+    aCallback->UpdateFailed(error);
+
+    // In case the callback does not consume the exception
+    error.SuppressException();
+    return;
+  }
+
+  RefPtr<ServiceWorkerJobQueue> queue = GetOrCreateJobQueue(scopeKey, aScope);
+
+  // "Let job be the result of running Create Job with update, registration’s
+  // scope url, newestWorker’s script url, promise, and the context object’s
+  // relevant settings object."
+  RefPtr<ServiceWorkerUpdateJob> job = new ServiceWorkerUpdateJob(
+      aPrincipal, registration->Scope(), std::move(aNewestWorkerScriptUrl),
+      registration->GetUpdateViaCache());
+
+  RefPtr<UpdateJobCallback> cb = new UpdateJobCallback(aCallback);
+  job->AppendResultCallback(cb);
+
+  // "Invoke Schedule Job with job."
+  queue->ScheduleJob(job);
+}
+
+RefPtr<GenericErrorResultPromise> ServiceWorkerManager::MaybeClaimClient(
+    const ClientInfo& aClientInfo,
+    ServiceWorkerRegistrationInfo* aWorkerRegistration) {
+  MOZ_DIAGNOSTIC_ASSERT(aWorkerRegistration);
+
+  if (!aWorkerRegistration->GetActive()) {
+    CopyableErrorResult rv;
+    rv.ThrowInvalidStateError("Worker is not active");
+    return GenericErrorResultPromise::CreateAndReject(rv, __func__);
+  }
+
+  // Same origin check
+  auto principalOrErr = aClientInfo.GetPrincipal();
+
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    CopyableErrorResult rv;
+    rv.ThrowSecurityError("Could not extract client's principal");
+    return GenericErrorResultPromise::CreateAndReject(rv, __func__);
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+  if (!aWorkerRegistration->Principal()->Equals(principal)) {
+    CopyableErrorResult rv;
+    rv.ThrowSecurityError("Worker is for a different origin");
+    return GenericErrorResultPromise::CreateAndReject(rv, __func__);
+  }
+
+  // The registration that should be controlling the client
+  RefPtr<ServiceWorkerRegistrationInfo> matchingRegistration =
+      GetServiceWorkerRegistrationInfo(aClientInfo);
+
+  // The registration currently controlling the client
+  RefPtr<ServiceWorkerRegistrationInfo> controllingRegistration;
+  GetClientRegistration(aClientInfo, getter_AddRefs(controllingRegistration));
+
+  if (aWorkerRegistration != matchingRegistration ||
+      aWorkerRegistration == controllingRegistration) {
+    return GenericErrorResultPromise::CreateAndResolve(true, __func__);
+  }
+
+  return StartControllingClient(aClientInfo, aWorkerRegistration);
+}
+
+RefPtr<GenericErrorResultPromise> ServiceWorkerManager::MaybeClaimClient(
+    const ClientInfo& aClientInfo,
+    const ServiceWorkerDescriptor& aServiceWorker) {
+  auto principalOrErr = aServiceWorker.GetPrincipal();
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return GenericErrorResultPromise::CreateAndResolve(false, __func__);
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      GetRegistration(principal, aServiceWorker.Scope());
+
+  // While ServiceWorkerManager is distributed across child processes its
+  // possible for us to sometimes get a claim for a new worker that has
+  // not propagated to this process yet.  For now, simply note that we
+  // are done.  The fix for this is to move the SWM to the parent process
+  // so there are no consistency errors.
+  if (NS_WARN_IF(!registration) || NS_WARN_IF(!registration->GetActive())) {
+    return GenericErrorResultPromise::CreateAndResolve(false, __func__);
+  }
+
+  return MaybeClaimClient(aClientInfo, registration);
+}
+
+void ServiceWorkerManager::UpdateClientControllers(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerInfo> activeWorker = aRegistration->GetActive();
+  MOZ_DIAGNOSTIC_ASSERT(activeWorker);
+
+  AutoTArray<RefPtr<ClientHandle>, 16> handleList;
+  for (const auto& client : mControlledClients.Values()) {
+    if (client->mRegistrationInfo != aRegistration) {
+      continue;
+    }
+
+    handleList.AppendElement(client->mClientHandle);
+  }
+
+  // Fire event after iterating mControlledClients is done to prevent
+  // modification by reentering from the event handlers during iteration.
+  for (auto& handle : handleList) {
+    RefPtr<GenericErrorResultPromise> p =
+        handle->Control(activeWorker->Descriptor());
+
+    RefPtr<ServiceWorkerManager> self = this;
+
+    // If we fail to control the client, then automatically remove it
+    // from our list of controlled clients.
+    p->Then(
+        GetMainThreadSerialEventTarget(), __func__,
+        [](bool) {
+          // do nothing on success
+        },
+        [self, clientInfo = handle->Info()](const CopyableErrorResult& aRv) {
+          // failed to control, forget about this client
+          self->StopControllingClient(clientInfo);
+        });
+  }
+}
+
+void ServiceWorkerManager::EvictFromBFCache(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+  for (const auto& client : mControlledClients.Values()) {
+    if (client->mRegistrationInfo == aRegistration) {
+      client->mClientHandle->EvictFromBFCache();
+    }
+  }
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetRegistration(nsIPrincipal* aPrincipal,
+                                      const nsACString& aScope) const {
+  MOZ_ASSERT(aPrincipal);
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  return GetRegistration(scopeKey, aScope);
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetRegistration(const PrincipalInfo& aPrincipalInfo,
+                                      const nsACString& aScope) const {
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalInfoToScopeKey(aPrincipalInfo, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  return GetRegistration(scopeKey, aScope);
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::ReloadRegistrationsForTest() {
+  if (NS_WARN_IF(!StaticPrefs::dom_serviceWorkers_testing_enabled())) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Let's keep it simple and fail if there are any controlled client,
+  // the test case can take care of making sure there is none when this
+  // method will be called.
+  if (NS_WARN_IF(!mControlledClients.IsEmpty())) {
+    return NS_ERROR_FAILURE;
+  }
+
+  for (const auto& info : mRegistrationInfos.Values()) {
+    for (ServiceWorkerRegistrationInfo* reg : info->mInfos.Values()) {
+      MOZ_ASSERT(reg);
+      reg->ForceShutdown();
+    }
+  }
+
+  mRegistrationInfos.Clear();
+
+  nsTArray<ServiceWorkerRegistrationData> data;
+  RefPtr<ServiceWorkerRegistrar> swr = ServiceWorkerRegistrar::Get();
+  if (NS_WARN_IF(!swr->ReloadDataForTest())) {
+    return NS_ERROR_FAILURE;
+  }
+  swr->GetRegistrations(data);
+  LoadRegistrations(data);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::RegisterForAddonPrincipal(nsIPrincipal* aPrincipal,
+                                                JSContext* aCx,
+                                                dom::Promise** aPromise) {
+  nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
+  if (NS_WARN_IF(!global)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult erv;
+  RefPtr<Promise> outer = Promise::Create(global, erv);
+  if (NS_WARN_IF(erv.Failed())) {
+    return erv.StealNSResult();
+  }
+
+  auto enabled =
+      StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup();
+  if (!enabled) {
+    outer->MaybeRejectWithNotAllowedError(
+        "Disabled. extensions.backgroundServiceWorker.enabled is false");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(aPrincipal);
+  auto* addonPolicy = BasePrincipal::Cast(aPrincipal)->AddonPolicy();
+  if (!addonPolicy) {
+    outer->MaybeRejectWithNotAllowedError("Not an extension principal");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  nsCString scope;
+  auto result = addonPolicy->GetURL(u""_ns);
+  if (result.isOk()) {
+    scope.Assign(NS_ConvertUTF16toUTF8(result.unwrap()));
+  } else {
+    outer->MaybeRejectWithUnknownError("Unable to resolve addon scope URL");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  nsString scriptURL;
+  addonPolicy->GetBackgroundWorker(scriptURL);
+
+  if (scriptURL.IsEmpty()) {
+    outer->MaybeRejectWithNotFoundError("Missing background worker script url");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  Maybe<ClientInfo> clientInfo =
+      dom::ClientManager::CreateInfo(ClientType::All, aPrincipal);
+
+  if (!clientInfo.isSome()) {
+    outer->MaybeRejectWithUnknownError("Error creating clientInfo");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  auto regPromise =
+      Register(clientInfo.ref(), scope, NS_ConvertUTF16toUTF8(scriptURL),
+               dom::ServiceWorkerUpdateViaCache::Imports);
+  const RefPtr<ServiceWorkerManager> self(this);
+  const nsCOMPtr<nsIPrincipal> principal(aPrincipal);
+  regPromise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      [self, outer, principal,
+       scope](const ServiceWorkerRegistrationDescriptor& regDesc) {
+        RefPtr<ServiceWorkerRegistrationInfo> registration =
+            self->GetRegistration(principal, scope);
+        if (registration) {
+          outer->MaybeResolve(registration);
+        } else {
+          outer->MaybeRejectWithUnknownError(
+              "Failed to retrieve ServiceWorkerRegistrationInfo");
+        }
+      },
+      [outer](const mozilla::CopyableErrorResult& err) {
+        CopyableErrorResult result(err);
+        outer->MaybeReject(std::move(result));
+      });
+
+  outer.forget(aPromise);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::GetRegistrationForAddonPrincipal(
+    nsIPrincipal* aPrincipal, nsIServiceWorkerRegistrationInfo** aInfo) {
+  MOZ_ASSERT(aPrincipal);
+
+  MOZ_ASSERT(aPrincipal);
+  auto* addonPolicy = BasePrincipal::Cast(aPrincipal)->AddonPolicy();
+  if (!addonPolicy) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCString scope;
+  auto result = addonPolicy->GetURL(u""_ns);
+  if (result.isOk()) {
+    scope.Assign(NS_ConvertUTF16toUTF8(result.unwrap()));
+  } else {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), scope);
+  if (NS_FAILED(rv)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> info =
+      GetServiceWorkerRegistrationInfo(aPrincipal, scopeURI);
+  if (!info) {
+    aInfo = nullptr;
+    return NS_OK;
+  }
+  info.forget(aInfo);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::WakeForExtensionAPIEvent(
+    const nsAString& aExtensionBaseURL, const nsAString& aAPINamespace,
+    const nsAString& aAPIEventName, JSContext* aCx, dom::Promise** aPromise) {
+  nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
+  if (NS_WARN_IF(!global)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult erv;
+  RefPtr<Promise> outer = Promise::Create(global, erv);
+  if (NS_WARN_IF(erv.Failed())) {
+    return erv.StealNSResult();
+  }
+
+  auto enabled =
+      StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup();
+  if (!enabled) {
+    outer->MaybeRejectWithNotAllowedError(
+        "Disabled. extensions.backgroundServiceWorker.enabled is false");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), aExtensionBaseURL);
+  if (NS_FAILED(rv)) {
+    outer->MaybeReject(rv);
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal;
+  MOZ_TRY_VAR(principal, ScopeToPrincipal(scopeURI, {}));
+
+  auto* addonPolicy = BasePrincipal::Cast(principal)->AddonPolicy();
+  if (NS_WARN_IF(!addonPolicy)) {
+    outer->MaybeRejectWithNotAllowedError(
+        "Not an extension principal or extension disabled");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  OriginAttributes attrs;
+  ServiceWorkerInfo* info = GetActiveWorkerInfoForScope(
+      attrs, NS_ConvertUTF16toUTF8(aExtensionBaseURL));
+  if (NS_WARN_IF(!info)) {
+    outer->MaybeRejectWithInvalidStateError(
+        "No active worker for the extension background service worker");
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  ServiceWorkerPrivate* workerPrivate = info->WorkerPrivate();
+  auto result =
+      workerPrivate->WakeForExtensionAPIEvent(aAPINamespace, aAPIEventName);
+  if (result.isErr()) {
+    outer->MaybeReject(result.propagateErr());
+    outer.forget(aPromise);
+    return NS_OK;
+  }
+
+  RefPtr<ServiceWorkerPrivate::PromiseExtensionWorkerHasListener> innerPromise =
+      result.unwrap();
+
+  innerPromise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      [outer](bool aSubscribedEvent) { outer->MaybeResolve(aSubscribedEvent); },
+      [outer](nsresult aErrorResult) { outer->MaybeReject(aErrorResult); });
+
+  outer.forget(aPromise);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::GetRegistrationByPrincipal(
+    nsIPrincipal* aPrincipal, const nsAString& aScope,
+    nsIServiceWorkerRegistrationInfo** aInfo) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aInfo);
+
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), aScope);
+  if (NS_FAILED(rv)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> info =
+      GetServiceWorkerRegistrationInfo(aPrincipal, scopeURI);
+  if (!info) {
+    return NS_ERROR_FAILURE;
+  }
+  info.forget(aInfo);
+
+  return NS_OK;
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::GetRegistration(const nsACString& aScopeKey,
+                                      const nsACString& aScope) const {
+  RefPtr<ServiceWorkerRegistrationInfo> reg;
+
+  RegistrationDataPerPrincipal* data;
+  if (!mRegistrationInfos.Get(aScopeKey, &data)) {
+    return reg.forget();
+  }
+
+  data->mInfos.Get(aScope, getter_AddRefs(reg));
+  return reg.forget();
+}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerManager::CreateNewRegistration(
+    const nsCString& aScope, nsIPrincipal* aPrincipal,
+    ServiceWorkerUpdateViaCache aUpdateViaCache,
+    IPCNavigationPreloadState aNavigationPreloadState) {
+#ifdef DEBUG
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIURI> scopeURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scopeURI), aScope);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  RefPtr<ServiceWorkerRegistrationInfo> tmp =
+      GetRegistration(aPrincipal, aScope);
+  MOZ_ASSERT(!tmp);
+#endif
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      new ServiceWorkerRegistrationInfo(aScope, aPrincipal, aUpdateViaCache,
+                                        std::move(aNavigationPreloadState));
+
+  // From now on ownership of registration is with
+  // mServiceWorkerRegistrationInfos.
+  AddScopeAndRegistration(aScope, registration);
+  return registration.forget();
+}
+
+void ServiceWorkerManager::MaybeRemoveRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(aRegistration);
+  RefPtr<ServiceWorkerInfo> newest = aRegistration->Newest();
+  if (!newest && HasScope(aRegistration->Principal(), aRegistration->Scope())) {
+    RemoveRegistration(aRegistration);
+  }
+}
+
+void ServiceWorkerManager::RemoveRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  // Note, we do not need to call mActor->SendUnregister() here.  There are a
+  // few ways we can get here: 1) Through a normal unregister which calls
+  // SendUnregister() in the
+  //    unregister job Start() method.
+  // 2) Through origin storage being purged.  These result in ForceUnregister()
+  //    starting unregister jobs which in turn call SendUnregister().
+  // 3) Through the failure to install a new service worker.  Since we don't
+  //    store the registration until install succeeds, we do not need to call
+  //    SendUnregister here.
+  MOZ_ASSERT(HasScope(aRegistration->Principal(), aRegistration->Scope()));
+
+  RemoveScopeAndRegistration(aRegistration);
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::GetAllRegistrations(nsIArray** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIMutableArray> array(do_CreateInstance(NS_ARRAY_CONTRACTID));
+  if (!array) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  for (const auto& info : mRegistrationInfos.Values()) {
+    for (ServiceWorkerRegistrationInfo* reg : info->mInfos.Values()) {
+      MOZ_ASSERT(reg);
+
+      array->AppendElement(reg);
+    }
+  }
+
+  array.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::RemoveRegistrationsByOriginAttributes(
+    const nsAString& aPattern) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(!aPattern.IsEmpty());
+
+  OriginAttributesPattern pattern;
+  MOZ_ALWAYS_TRUE(pattern.Init(aPattern));
+
+  for (const auto& data : mRegistrationInfos.Values()) {
+    // We can use iteration because ForceUnregister (and Unregister) are
+    // async. Otherwise doing some R/W operations on an hashtable during
+    // iteration will crash.
+    for (ServiceWorkerRegistrationInfo* reg : data->mInfos.Values()) {
+      MOZ_ASSERT(reg);
+      MOZ_ASSERT(reg->Principal());
+
+      bool matches = pattern.Matches(reg->Principal()->OriginAttributesRef());
+      if (!matches) {
+        continue;
+      }
+
+      ForceUnregister(data.get(), reg);
+    }
+  }
+
+  return NS_OK;
+}
+
+void ServiceWorkerManager::ForceUnregister(
+    RegistrationDataPerPrincipal* aRegistrationData,
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(aRegistrationData);
+  MOZ_ASSERT(aRegistration);
+
+  RefPtr<ServiceWorkerJobQueue> queue;
+  aRegistrationData->mJobQueues.Get(aRegistration->Scope(),
+                                    getter_AddRefs(queue));
+  if (queue) {
+    queue->CancelAll();
+  }
+
+  if (auto entry =
+          aRegistrationData->mUpdateTimers.Lookup(aRegistration->Scope())) {
+    entry.Data()->Cancel();
+    entry.Remove();
+  }
+
+  // Since Unregister is async, it is ok to call it in an enumeration.
+  Unregister(aRegistration->Principal(), nullptr,
+             NS_ConvertUTF8toUTF16(aRegistration->Scope()));
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::AddListener(nsIServiceWorkerManagerListener* aListener) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aListener || mListeners.Contains(aListener)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mListeners.AppendElement(aListener);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::RemoveListener(
+    nsIServiceWorkerManagerListener* aListener) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aListener || !mListeners.Contains(aListener)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mListeners.RemoveElement(aListener);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::Observe(nsISupports* aSubject, const char* aTopic,
+                              const char16_t* aData) {
+  if (strcmp(aTopic, kFinishShutdownTopic) == 0) {
+    MaybeFinishShutdown();
+    return NS_OK;
+  }
+
+  MOZ_CRASH("Received message we aren't supposed to be registered for!");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerManager::PropagateUnregister(
+    nsIPrincipal* aPrincipal, nsIServiceWorkerUnregisterCallback* aCallback,
+    const nsAString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  // Return earlier with an explicit failure if this xpcom method is called
+  // when the ServiceWorkerManager is not initialized yet or it is already
+  // shutting down.
+  if (NS_WARN_IF(!mActor)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  PrincipalInfo principalInfo;
+  if (NS_WARN_IF(
+          NS_FAILED(PrincipalToPrincipalInfo(aPrincipal, &principalInfo)))) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mActor->SendPropagateUnregister(principalInfo, aScope);
+
+  nsresult rv = Unregister(aPrincipal, aCallback, aScope);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+void ServiceWorkerManager::NotifyListenersOnRegister(
+    nsIServiceWorkerRegistrationInfo* aInfo) {
+  nsTArray<nsCOMPtr<nsIServiceWorkerManagerListener>> listeners(
+      mListeners.Clone());
+  for (size_t index = 0; index < listeners.Length(); ++index) {
+    listeners[index]->OnRegister(aInfo);
+  }
+}
+
+void ServiceWorkerManager::NotifyListenersOnUnregister(
+    nsIServiceWorkerRegistrationInfo* aInfo) {
+  nsTArray<nsCOMPtr<nsIServiceWorkerManagerListener>> listeners(
+      mListeners.Clone());
+  for (size_t index = 0; index < listeners.Length(); ++index) {
+    listeners[index]->OnUnregister(aInfo);
+  }
+}
+
+void ServiceWorkerManager::NotifyListenersOnQuotaUsageCheckFinish(
+    nsIServiceWorkerRegistrationInfo* aRegistration) {
+  nsTArray<nsCOMPtr<nsIServiceWorkerManagerListener>> listeners(
+      mListeners.Clone());
+  for (size_t index = 0; index < listeners.Length(); ++index) {
+    listeners[index]->OnQuotaUsageCheckFinish(aRegistration);
+  }
+}
+
+class UpdateTimerCallback final : public nsITimerCallback, public nsINamed {
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  const nsCString mScope;
+
+  ~UpdateTimerCallback() = default;
+
+ public:
+  UpdateTimerCallback(nsIPrincipal* aPrincipal, const nsACString& aScope)
+      : mPrincipal(aPrincipal), mScope(aScope) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mPrincipal);
+    MOZ_ASSERT(!mScope.IsEmpty());
+  }
+
+  NS_IMETHOD
+  Notify(nsITimer* aTimer) override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+    if (!swm) {
+      // shutting down, do nothing
+      return NS_OK;
+    }
+
+    swm->UpdateTimerFired(mPrincipal, mScope);
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetName(nsACString& aName) override {
+    aName.AssignLiteral("UpdateTimerCallback");
+    return NS_OK;
+  }
+
+  NS_DECL_ISUPPORTS
+};
+
+NS_IMPL_ISUPPORTS(UpdateTimerCallback, nsITimerCallback, nsINamed)
+
+void ServiceWorkerManager::ScheduleUpdateTimer(nsIPrincipal* aPrincipal,
+                                               const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(!aScope.IsEmpty());
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!mRegistrationInfos.Get(scopeKey, &data)) {
+    return;
+  }
+
+  data->mUpdateTimers.WithEntryHandle(
+      aScope, [&aPrincipal, &aScope](auto&& entry) {
+        if (entry) {
+          // In case there is already a timer scheduled, just use the original
+          // schedule time.  We don't want to push it out to a later time since
+          // that could allow updates to be starved forever if events are
+          // continuously fired.
+          return;
+        }
+
+        nsCOMPtr<nsITimerCallback> callback =
+            new UpdateTimerCallback(aPrincipal, aScope);
+
+        const uint32_t UPDATE_DELAY_MS = 1000;
+
+        nsCOMPtr<nsITimer> timer;
+
+        const nsresult rv =
+            NS_NewTimerWithCallback(getter_AddRefs(timer), callback,
+                                    UPDATE_DELAY_MS, nsITimer::TYPE_ONE_SHOT);
+
+        if (NS_WARN_IF(NS_FAILED(rv))) {
+          return;
+        }
+
+        entry.Insert(std::move(timer));
+      });
+}
+
+void ServiceWorkerManager::UpdateTimerFired(nsIPrincipal* aPrincipal,
+                                            const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(!aScope.IsEmpty());
+
+  if (mShuttingDown) {
+    return;
+  }
+
+  // First cleanup the timer.
+  nsAutoCString scopeKey;
+  nsresult rv = PrincipalToScopeKey(aPrincipal, scopeKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RegistrationDataPerPrincipal* data;
+  if (!mRegistrationInfos.Get(scopeKey, &data)) {
+    return;
+  }
+
+  if (auto entry = data->mUpdateTimers.Lookup(aScope)) {
+    entry.Data()->Cancel();
+    entry.Remove();
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration;
+  data->mInfos.Get(aScope, getter_AddRefs(registration));
+  if (!registration) {
+    return;
+  }
+
+  if (!registration->CheckAndClearIfUpdateNeeded()) {
+    return;
+  }
+
+  OriginAttributes attrs = aPrincipal->OriginAttributesRef();
+
+  SoftUpdate(attrs, aScope);
+}
+
+void ServiceWorkerManager::MaybeSendUnregister(nsIPrincipal* aPrincipal,
+                                               const nsACString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(!aScope.IsEmpty());
+
+  if (!mActor) {
+    return;
+  }
+
+  PrincipalInfo principalInfo;
+  nsresult rv = PrincipalToPrincipalInfo(aPrincipal, &principalInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  Unused << mActor->SendUnregister(principalInfo,
+                                   NS_ConvertUTF8toUTF16(aScope));
+}
+
+void ServiceWorkerManager::AddOrphanedRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRegistration);
+  MOZ_ASSERT(aRegistration->IsUnregistered());
+  MOZ_ASSERT(!aRegistration->IsControllingClients());
+  MOZ_ASSERT(!aRegistration->IsIdle());
+  MOZ_ASSERT(!mOrphanedRegistrations.has(aRegistration));
+
+  MOZ_ALWAYS_TRUE(mOrphanedRegistrations.putNew(aRegistration));
+}
+
+void ServiceWorkerManager::RemoveOrphanedRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRegistration);
+  MOZ_ASSERT(aRegistration->IsUnregistered());
+  MOZ_ASSERT(!aRegistration->IsControllingClients());
+  MOZ_ASSERT(aRegistration->IsIdle());
+  MOZ_ASSERT(mOrphanedRegistrations.has(aRegistration));
+
+  mOrphanedRegistrations.remove(aRegistration);
+}
+
+uint32_t ServiceWorkerManager::MaybeInitServiceWorkerShutdownProgress() const {
+  if (!mShutdownBlocker) {
+    return ServiceWorkerShutdownBlocker::kInvalidShutdownStateId;
+  }
+
+  return mShutdownBlocker->CreateShutdownState();
+}
+
+void ServiceWorkerManager::ReportServiceWorkerShutdownProgress(
+    uint32_t aShutdownStateId,
+    ServiceWorkerShutdownState::Progress aProgress) const {
+  MOZ_ASSERT(mShutdownBlocker);
+  mShutdownBlocker->ReportShutdownProgress(aShutdownStateId, aProgress);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerManager.h b/dom/serviceworkers/ServiceWorkerManager.h
new file mode 100644
index 0000000000..11c8f2f672
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerManager.h
@@ -0,0 +1,442 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_workers_serviceworkermanager_h
+#define mozilla_dom_workers_serviceworkermanager_h
+
+#include <cstdint>
+#include "ErrorList.h"
+#include "ServiceWorkerShutdownState.h"
+#include "js/ErrorReport.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/HashTable.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/ClientHandle.h"
+#include "mozilla/dom/ClientOpPromise.h"
+#include "mozilla/dom/ServiceWorkerRegistrationBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrationInfo.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+#include "mozilla/mozalloc.h"
+#include "nsClassHashtable.h"
+#include "nsContentUtils.h"
+#include "nsHashKeys.h"
+#include "nsIObserver.h"
+#include "nsIServiceWorkerManager.h"
+#include "nsISupports.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+
+class nsIConsoleReportCollector;
+
+namespace mozilla {
+
+class OriginAttributes;
+
+namespace ipc {
+class PrincipalInfo;
+}  // namespace ipc
+
+namespace dom {
+
+extern uint32_t gServiceWorkersRegistered;
+extern uint32_t gServiceWorkersRegisteredFetch;
+
+class ContentParent;
+class ServiceWorkerInfo;
+class ServiceWorkerJobQueue;
+class ServiceWorkerManagerChild;
+class ServiceWorkerPrivate;
+class ServiceWorkerRegistrar;
+class ServiceWorkerShutdownBlocker;
+
+class ServiceWorkerUpdateFinishCallback {
+ protected:
+  virtual ~ServiceWorkerUpdateFinishCallback() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerUpdateFinishCallback)
+
+  virtual void UpdateSucceeded(ServiceWorkerRegistrationInfo* aInfo) = 0;
+
+  virtual void UpdateFailed(ErrorResult& aStatus) = 0;
+};
+
+#define NS_SERVICEWORKERMANAGER_IMPL_IID             \
+  { /* f4f8755a-69ca-46e8-a65d-775745535990 */       \
+    0xf4f8755a, 0x69ca, 0x46e8, {                    \
+      0xa6, 0x5d, 0x77, 0x57, 0x45, 0x53, 0x59, 0x90 \
+    }                                                \
+  }
+
+/*
+ * The ServiceWorkerManager is a per-process global that deals with the
+ * installation, querying and event dispatch of ServiceWorkers for all the
+ * origins in the process.
+ *
+ * NOTE: the following documentation is a WIP:
+ *
+ * The ServiceWorkerManager (SWM) is a main-thread, parent-process singleton
+ * that encapsulates the browser-global state of service workers. This state
+ * includes, but is not limited to, all service worker registrations and all
+ * controlled service worker clients. The SWM also provides methods to read and
+ * mutate this state and to dispatch operations (e.g. DOM events such as a
+ * FetchEvent) to service workers.
+ *
+ * Example usage:
+ *
+ * MOZ_ASSERT(NS_IsMainThread(), "SWM is main-thread only");
+ *
+ * RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+ *
+ * // Nullness must be checked by code that possibly executes during browser
+ * // shutdown, which is when the SWM is destroyed.
+ * if (swm) {
+ *   // Do something with the SWM.
+ * }
+ */
+class ServiceWorkerManager final : public nsIServiceWorkerManager,
+                                   public nsIObserver {
+  friend class GetRegistrationsRunnable;
+  friend class GetRegistrationRunnable;
+  friend class ServiceWorkerJob;
+  friend class ServiceWorkerRegistrationInfo;
+  friend class ServiceWorkerShutdownBlocker;
+  friend class ServiceWorkerUnregisterJob;
+  friend class ServiceWorkerUpdateJob;
+  friend class UpdateTimerCallback;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISERVICEWORKERMANAGER
+  NS_DECL_NSIOBSERVER
+
+  // Return true if the given principal and URI matches a registered service
+  // worker which handles fetch event.
+  // If there is a matched service worker but doesn't handle fetch events, this
+  // method will try to set the matched service worker as the controller of the
+  // passed in channel. Then also schedule a soft-update job for the service
+  // worker.
+  bool IsAvailable(nsIPrincipal* aPrincipal, nsIURI* aURI,
+                   nsIChannel* aChannel);
+
+  void DispatchFetchEvent(nsIInterceptedChannel* aChannel, ErrorResult& aRv);
+
+  void Update(nsIPrincipal* aPrincipal, const nsACString& aScope,
+              nsCString aNewestWorkerScriptUrl,
+              ServiceWorkerUpdateFinishCallback* aCallback);
+
+  void UpdateInternal(nsIPrincipal* aPrincipal, const nsACString& aScope,
+                      nsCString&& aNewestWorkerScriptUrl,
+                      ServiceWorkerUpdateFinishCallback* aCallback);
+
+  void SoftUpdate(const OriginAttributes& aOriginAttributes,
+                  const nsACString& aScope);
+
+  void SoftUpdateInternal(const OriginAttributes& aOriginAttributes,
+                          const nsACString& aScope,
+                          ServiceWorkerUpdateFinishCallback* aCallback);
+
+  RefPtr<ServiceWorkerRegistrationPromise> Register(
+      const ClientInfo& aClientInfo, const nsACString& aScopeURL,
+      const nsACString& aScriptURL,
+      ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  RefPtr<ServiceWorkerRegistrationPromise> GetRegistration(
+      const ClientInfo& aClientInfo, const nsACString& aURL) const;
+
+  RefPtr<ServiceWorkerRegistrationListPromise> GetRegistrations(
+      const ClientInfo& aClientInfo) const;
+
+  already_AddRefed<ServiceWorkerRegistrationInfo> GetRegistration(
+      nsIPrincipal* aPrincipal, const nsACString& aScope) const;
+
+  already_AddRefed<ServiceWorkerRegistrationInfo> GetRegistration(
+      const mozilla::ipc::PrincipalInfo& aPrincipal,
+      const nsACString& aScope) const;
+
+  already_AddRefed<ServiceWorkerRegistrationInfo> CreateNewRegistration(
+      const nsCString& aScope, nsIPrincipal* aPrincipal,
+      ServiceWorkerUpdateViaCache aUpdateViaCache,
+      IPCNavigationPreloadState aNavigationPreloadState =
+          IPCNavigationPreloadState(false, "true"_ns));
+
+  void RemoveRegistration(ServiceWorkerRegistrationInfo* aRegistration);
+
+  void StoreRegistration(nsIPrincipal* aPrincipal,
+                         ServiceWorkerRegistrationInfo* aRegistration);
+
+  /**
+   * Report an error for the given scope to any window we think might be
+   * interested, failing over to the Browser Console if we couldn't find any.
+   *
+   * Error messages should be localized, so you probably want to call
+   * LocalizeAndReportToAllClients instead, which in turn calls us after
+   * localizing the error.
+   */
+  void ReportToAllClients(const nsCString& aScope, const nsString& aMessage,
+                          const nsString& aFilename, const nsString& aLine,
+                          uint32_t aLineNumber, uint32_t aColumnNumber,
+                          uint32_t aFlags);
+
+  /**
+   * Report a localized error for the given scope to any window we think might
+   * be interested.
+   *
+   * Note that this method takes an nsTArray<nsString> for the parameters, not
+   * bare chart16_t*[].  You can use a std::initializer_list constructor inline
+   * so that argument might look like: nsTArray<nsString> { some_nsString,
+   * PromiseFlatString(some_nsSubString_aka_nsAString),
+   * NS_ConvertUTF8toUTF16(some_nsCString_or_nsCSubString),
+   * u"some literal"_ns }.  If you have anything else, like a
+   * number, you can use an nsAutoString with AppendInt/friends.
+   *
+   * @param [aFlags]
+   *   The nsIScriptError flag, one of errorFlag (0x0), warningFlag (0x1),
+   *   infoFlag (0x8).  We default to error if omitted because usually we're
+   *   logging exceptional and/or obvious breakage.
+   */
+  static void LocalizeAndReportToAllClients(
+      const nsCString& aScope, const char* aStringKey,
+      const nsTArray<nsString>& aParamArray, uint32_t aFlags = 0x0,
+      const nsString& aFilename = u""_ns, const nsString& aLine = u""_ns,
+      uint32_t aLineNumber = 0, uint32_t aColumnNumber = 0);
+
+  // Always consumes the error by reporting to consoles of all controlled
+  // documents.
+  void HandleError(JSContext* aCx, nsIPrincipal* aPrincipal,
+                   const nsCString& aScope, const nsString& aWorkerURL,
+                   const nsString& aMessage, const nsString& aFilename,
+                   const nsString& aLine, uint32_t aLineNumber,
+                   uint32_t aColumnNumber, uint32_t aFlags, JSExnType aExnType);
+
+  [[nodiscard]] RefPtr<GenericErrorResultPromise> MaybeClaimClient(
+      const ClientInfo& aClientInfo,
+      ServiceWorkerRegistrationInfo* aWorkerRegistration);
+
+  [[nodiscard]] RefPtr<GenericErrorResultPromise> MaybeClaimClient(
+      const ClientInfo& aClientInfo,
+      const ServiceWorkerDescriptor& aServiceWorker);
+
+  static already_AddRefed<ServiceWorkerManager> GetInstance();
+
+  void LoadRegistration(const ServiceWorkerRegistrationData& aRegistration);
+
+  void LoadRegistrations(
+      const nsTArray<ServiceWorkerRegistrationData>& aRegistrations);
+
+  void MaybeCheckNavigationUpdate(const ClientInfo& aClientInfo);
+
+  nsresult SendPushEvent(const nsACString& aOriginAttributes,
+                         const nsACString& aScope, const nsAString& aMessageId,
+                         const Maybe<nsTArray<uint8_t>>& aData);
+
+  void WorkerIsIdle(ServiceWorkerInfo* aWorker);
+
+  RefPtr<ServiceWorkerRegistrationPromise> WhenReady(
+      const ClientInfo& aClientInfo);
+
+  void CheckPendingReadyPromises();
+
+  void RemovePendingReadyPromise(const ClientInfo& aClientInfo);
+
+  void NoteInheritedController(const ClientInfo& aClientInfo,
+                               const ServiceWorkerDescriptor& aController);
+
+  void BlockShutdownOn(GenericNonExclusivePromise* aPromise,
+                       uint32_t aShutdownStateId);
+
+  nsresult GetClientRegistration(
+      const ClientInfo& aClientInfo,
+      ServiceWorkerRegistrationInfo** aRegistrationInfo);
+
+  int32_t GetPrincipalQuotaUsageCheckCount(nsIPrincipal* aPrincipal);
+
+  void CheckPrincipalQuotaUsage(nsIPrincipal* aPrincipal,
+                                const nsACString& aScope);
+
+  // Returns the shutdown state ID (may be an invalid ID if an
+  // nsIAsyncShutdownBlocker is not used).
+  uint32_t MaybeInitServiceWorkerShutdownProgress() const;
+
+  void ReportServiceWorkerShutdownProgress(
+      uint32_t aShutdownStateId,
+      ServiceWorkerShutdownState::Progress aProgress) const;
+
+  // Record periodic telemetry on number of running ServiceWorkers.  When
+  // the number of running ServiceWorkers changes (or on shutdown),
+  // ServiceWorkerPrivateImpl will call RecordTelemetry with the number of
+  // running serviceworkers and those supporting Fetch.  We use
+  // mTelemetryLastChange to determine how many datapoints to inject into
+  // Telemetry, and dispatch a background runnable to call
+  // RecordTelemetryGap() and Accumulate them.
+  void RecordTelemetry(uint32_t aNumber, uint32_t aFetch);
+
+  void EvictFromBFCache(ServiceWorkerRegistrationInfo* aRegistration);
+
+ private:
+  struct RegistrationDataPerPrincipal;
+
+  static bool FindScopeForPath(const nsACString& aScopeKey,
+                               const nsACString& aPath,
+                               RegistrationDataPerPrincipal** aData,
+                               nsACString& aMatch);
+
+  ServiceWorkerManager();
+  ~ServiceWorkerManager();
+
+  void Init(ServiceWorkerRegistrar* aRegistrar);
+
+  RefPtr<GenericErrorResultPromise> StartControllingClient(
+      const ClientInfo& aClientInfo,
+      ServiceWorkerRegistrationInfo* aRegistrationInfo,
+      bool aControlClientHandle = true);
+
+  void StopControllingClient(const ClientInfo& aClientInfo);
+
+  void MaybeStartShutdown();
+
+  void MaybeFinishShutdown();
+
+  already_AddRefed<ServiceWorkerJobQueue> GetOrCreateJobQueue(
+      const nsACString& aOriginSuffix, const nsACString& aScope);
+
+  void MaybeRemoveRegistrationInfo(const nsACString& aScopeKey);
+
+  already_AddRefed<ServiceWorkerRegistrationInfo> GetRegistration(
+      const nsACString& aScopeKey, const nsACString& aScope) const;
+
+  void AbortCurrentUpdate(ServiceWorkerRegistrationInfo* aRegistration);
+
+  nsresult Update(ServiceWorkerRegistrationInfo* aRegistration);
+
+  ServiceWorkerInfo* GetActiveWorkerInfoForScope(
+      const OriginAttributes& aOriginAttributes, const nsACString& aScope);
+
+  void StopControllingRegistration(
+      ServiceWorkerRegistrationInfo* aRegistration);
+
+  already_AddRefed<ServiceWorkerRegistrationInfo>
+  GetServiceWorkerRegistrationInfo(const ClientInfo& aClientInfo) const;
+
+  already_AddRefed<ServiceWorkerRegistrationInfo>
+  GetServiceWorkerRegistrationInfo(nsIPrincipal* aPrincipal,
+                                   nsIURI* aURI) const;
+
+  already_AddRefed<ServiceWorkerRegistrationInfo>
+  GetServiceWorkerRegistrationInfo(const nsACString& aScopeKey,
+                                   nsIURI* aURI) const;
+
+  // This method generates a key using isInElementBrowser from the principal. We
+  // don't use the origin because it can change during the loading.
+  static nsresult PrincipalToScopeKey(nsIPrincipal* aPrincipal,
+                                      nsACString& aKey);
+
+  static nsresult PrincipalInfoToScopeKey(
+      const mozilla::ipc::PrincipalInfo& aPrincipalInfo, nsACString& aKey);
+
+  static void AddScopeAndRegistration(
+      const nsACString& aScope, ServiceWorkerRegistrationInfo* aRegistation);
+
+  static bool HasScope(nsIPrincipal* aPrincipal, const nsACString& aScope);
+
+  static void RemoveScopeAndRegistration(
+      ServiceWorkerRegistrationInfo* aRegistration);
+
+  void QueueFireEventOnServiceWorkerRegistrations(
+      ServiceWorkerRegistrationInfo* aRegistration, const nsAString& aName);
+
+  void UpdateClientControllers(ServiceWorkerRegistrationInfo* aRegistration);
+
+  void MaybeRemoveRegistration(ServiceWorkerRegistrationInfo* aRegistration);
+
+  void PurgeServiceWorker(const ServiceWorkerRegistrationData& aRegistration,
+                          nsIPrincipal* aPrincipal);
+
+  RefPtr<ServiceWorkerManagerChild> mActor;
+
+  bool mShuttingDown;
+
+  nsTArray<nsCOMPtr<nsIServiceWorkerManagerListener>> mListeners;
+
+  void NotifyListenersOnRegister(
+      nsIServiceWorkerRegistrationInfo* aRegistration);
+
+  void NotifyListenersOnUnregister(
+      nsIServiceWorkerRegistrationInfo* aRegistration);
+
+  void NotifyListenersOnQuotaUsageCheckFinish(
+      nsIServiceWorkerRegistrationInfo* aRegistration);
+
+  void ScheduleUpdateTimer(nsIPrincipal* aPrincipal, const nsACString& aScope);
+
+  void UpdateTimerFired(nsIPrincipal* aPrincipal, const nsACString& aScope);
+
+  void MaybeSendUnregister(nsIPrincipal* aPrincipal, const nsACString& aScope);
+
+  nsresult SendNotificationEvent(const nsAString& aEventName,
+                                 const nsACString& aOriginSuffix,
+                                 const nsACString& aScope, const nsAString& aID,
+                                 const nsAString& aTitle, const nsAString& aDir,
+                                 const nsAString& aLang, const nsAString& aBody,
+                                 const nsAString& aTag, const nsAString& aIcon,
+                                 const nsAString& aData,
+                                 const nsAString& aBehavior);
+
+  // Used by remove() and removeAll() when clearing history.
+  // MUST ONLY BE CALLED FROM UnregisterIfMatchesHost!
+  void ForceUnregister(RegistrationDataPerPrincipal* aRegistrationData,
+                       ServiceWorkerRegistrationInfo* aRegistration);
+
+  // An "orphaned" registration is one that is unregistered and not controlling
+  // clients. The ServiceWorkerManager must know about all orphaned
+  // registrations to forcefully shutdown all Service Workers during browser
+  // shutdown.
+  void AddOrphanedRegistration(ServiceWorkerRegistrationInfo* aRegistration);
+
+  void RemoveOrphanedRegistration(ServiceWorkerRegistrationInfo* aRegistration);
+
+  HashSet<RefPtr<ServiceWorkerRegistrationInfo>,
+          PointerHasher<ServiceWorkerRegistrationInfo*>>
+      mOrphanedRegistrations;
+
+  RefPtr<ServiceWorkerShutdownBlocker> mShutdownBlocker;
+
+  nsClassHashtable<nsCStringHashKey, RegistrationDataPerPrincipal>
+      mRegistrationInfos;
+
+  struct ControlledClientData {
+    RefPtr<ClientHandle> mClientHandle;
+    RefPtr<ServiceWorkerRegistrationInfo> mRegistrationInfo;
+
+    ControlledClientData(ClientHandle* aClientHandle,
+                         ServiceWorkerRegistrationInfo* aRegistrationInfo)
+        : mClientHandle(aClientHandle), mRegistrationInfo(aRegistrationInfo) {}
+  };
+
+  nsClassHashtable<nsIDHashKey, ControlledClientData> mControlledClients;
+
+  struct PendingReadyData {
+    RefPtr<ClientHandle> mClientHandle;
+    RefPtr<ServiceWorkerRegistrationPromise::Private> mPromise;
+
+    explicit PendingReadyData(ClientHandle* aClientHandle)
+        : mClientHandle(aClientHandle),
+          mPromise(new ServiceWorkerRegistrationPromise::Private(__func__)) {}
+  };
+
+  nsTArray<UniquePtr<PendingReadyData>> mPendingReadyList;
+
+  const uint32_t mTelemetryPeriodMs = 5 * 1000;
+  TimeStamp mTelemetryLastChange;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_workers_serviceworkermanager_h
diff --git a/dom/serviceworkers/ServiceWorkerManagerChild.h b/dom/serviceworkers/ServiceWorkerManagerChild.h
new file mode 100644
index 0000000000..54a374b14b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerManagerChild.h
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerManagerChild_h
+#define mozilla_dom_ServiceWorkerManagerChild_h
+
+#include "mozilla/dom/PServiceWorkerManagerChild.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+
+namespace mozilla {
+
+class OriginAttributes;
+
+namespace ipc {
+class BackgroundChildImpl;
+}  // namespace ipc
+
+namespace dom {
+
+class ServiceWorkerManagerChild final : public PServiceWorkerManagerChild {
+  friend class mozilla::ipc::BackgroundChildImpl;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerManagerChild)
+
+  void ManagerShuttingDown() { mShuttingDown = true; }
+
+ private:
+  ServiceWorkerManagerChild() : mShuttingDown(false) {}
+
+  ~ServiceWorkerManagerChild() = default;
+
+  bool mShuttingDown;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ServiceWorkerManagerChild_h
diff --git a/dom/serviceworkers/ServiceWorkerManagerParent.cpp b/dom/serviceworkers/ServiceWorkerManagerParent.cpp
new file mode 100644
index 0000000000..5ed0f4faa8
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerManagerParent.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerManagerParent.h"
+#include "ServiceWorkerUtils.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/ServiceWorkerRegistrar.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/Unused.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+ServiceWorkerManagerParent::ServiceWorkerManagerParent() {
+  AssertIsOnBackgroundThread();
+}
+
+ServiceWorkerManagerParent::~ServiceWorkerManagerParent() {
+  AssertIsOnBackgroundThread();
+}
+
+mozilla::ipc::IPCResult ServiceWorkerManagerParent::RecvRegister(
+    const ServiceWorkerRegistrationData& aData) {
+  AssertIsInMainProcess();
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!BackgroundParent::IsOtherProcessActor(Manager()));
+
+  // Basic validation.
+  if (aData.scope().IsEmpty() ||
+      aData.principal().type() == PrincipalInfo::TNullPrincipalInfo ||
+      aData.principal().type() == PrincipalInfo::TSystemPrincipalInfo) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+
+  // If false then we have shutdown during the process of trying to update the
+  // registrar. We can give up on this modification.
+  if (const RefPtr<dom::ServiceWorkerRegistrar> service =
+          dom::ServiceWorkerRegistrar::Get()) {
+    service->RegisterServiceWorker(aData);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ServiceWorkerManagerParent::RecvUnregister(
+    const PrincipalInfo& aPrincipalInfo, const nsString& aScope) {
+  AssertIsInMainProcess();
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!BackgroundParent::IsOtherProcessActor(Manager()));
+
+  // Basic validation.
+  if (aScope.IsEmpty() ||
+      aPrincipalInfo.type() == PrincipalInfo::TNullPrincipalInfo ||
+      aPrincipalInfo.type() == PrincipalInfo::TSystemPrincipalInfo) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+
+  // If false then we have shutdown during the process of trying to update the
+  // registrar. We can give up on this modification.
+  if (const RefPtr<dom::ServiceWorkerRegistrar> service =
+          dom::ServiceWorkerRegistrar::Get()) {
+    service->UnregisterServiceWorker(aPrincipalInfo,
+                                     NS_ConvertUTF16toUTF8(aScope));
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ServiceWorkerManagerParent::RecvPropagateUnregister(
+    const PrincipalInfo& aPrincipalInfo, const nsString& aScope) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<dom::ServiceWorkerRegistrar> service =
+      dom::ServiceWorkerRegistrar::Get();
+  MOZ_ASSERT(service);
+
+  // It's possible that we don't have any ServiceWorkerManager managing this
+  // scope but we still need to unregister it from the ServiceWorkerRegistrar.
+  service->UnregisterServiceWorker(aPrincipalInfo,
+                                   NS_ConvertUTF16toUTF8(aScope));
+
+  // There is no longer any point to propagating because the only sender is the
+  // one and only ServiceWorkerManager, but it is necessary for us to have run
+  // the unregister call above because until Bug 1183245 is fixed,
+  // nsIServiceWorkerManager.propagateUnregister() is a de facto API for
+  // clearing ServiceWorker registrations by Sanitizer.jsm via
+  // ServiceWorkerCleanUp.jsm, as well as devtools "unregister" affordance and
+  // the no-longer-relevant about:serviceworkers UI.
+
+  return IPC_OK();
+}
+
+void ServiceWorkerManagerParent::ActorDestroy(ActorDestroyReason aWhy) {
+  AssertIsOnBackgroundThread();
+}
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/ServiceWorkerManagerParent.h b/dom/serviceworkers/ServiceWorkerManagerParent.h
new file mode 100644
index 0000000000..741f2250b3
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerManagerParent.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerManagerParent_h
+#define mozilla_dom_ServiceWorkerManagerParent_h
+
+#include "mozilla/dom/PServiceWorkerManagerParent.h"
+
+namespace mozilla {
+
+namespace ipc {
+class BackgroundParentImpl;
+}  // namespace ipc
+
+namespace dom {
+
+class ServiceWorkerManagerService;
+
+class ServiceWorkerManagerParent final : public PServiceWorkerManagerParent {
+  friend class mozilla::ipc::BackgroundParentImpl;
+  friend class PServiceWorkerManagerParent;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerManagerParent)
+
+ private:
+  ServiceWorkerManagerParent();
+  ~ServiceWorkerManagerParent();
+
+  mozilla::ipc::IPCResult RecvRegister(
+      const ServiceWorkerRegistrationData& aData);
+
+  mozilla::ipc::IPCResult RecvUnregister(const PrincipalInfo& aPrincipalInfo,
+                                         const nsString& aScope);
+
+  mozilla::ipc::IPCResult RecvPropagateUnregister(
+      const PrincipalInfo& aPrincipalInfo, const nsString& aScope);
+
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ServiceWorkerManagerParent_h
diff --git a/dom/serviceworkers/ServiceWorkerOp.cpp b/dom/serviceworkers/ServiceWorkerOp.cpp
new file mode 100644
index 0000000000..8811404a0f
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerOp.cpp
@@ -0,0 +1,1925 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerOp.h"
+
+#include <utility>
+
+#include "ServiceWorkerOpPromise.h"
+#include "js/Exception.h"  // JS::ExceptionStack, JS::StealPendingExceptionStack
+#include "jsapi.h"
+
+#include "nsCOMPtr.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsINamed.h"
+#include "nsIPushErrorReporter.h"
+#include "nsISupportsImpl.h"
+#include "nsITimer.h"
+#include "nsIURI.h"
+#include "nsServiceManagerUtils.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+
+#include "ServiceWorkerCloneData.h"
+#include "ServiceWorkerShutdownState.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/OwningNonNull.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/Client.h"
+#include "mozilla/dom/ExtendableMessageEventBinding.h"
+#include "mozilla/dom/FetchEventBinding.h"
+#include "mozilla/dom/FetchEventOpProxyChild.h"
+#include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/InternalRequest.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/Notification.h"
+#include "mozilla/dom/NotificationEvent.h"
+#include "mozilla/dom/NotificationEventBinding.h"
+#include "mozilla/dom/PerformanceTiming.h"
+#include "mozilla/dom/PerformanceStorage.h"
+#include "mozilla/dom/PushEventBinding.h"
+#include "mozilla/dom/RemoteWorkerChild.h"
+#include "mozilla/dom/RemoteWorkerService.h"
+#include "mozilla/dom/Request.h"
+#include "mozilla/dom/Response.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/SafeRefPtr.h"
+#include "mozilla/dom/ServiceWorkerBinding.h"
+#include "mozilla/dom/ServiceWorkerGlobalScopeBinding.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/dom/WorkerRef.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/extensions/ExtensionBrowser.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class ExtendableEventKeepAliveHandler final
+    : public ExtendableEvent::ExtensionsHandler,
+      public PromiseNativeHandler {
+ public:
+  NS_DECL_ISUPPORTS
+
+  static RefPtr<ExtendableEventKeepAliveHandler> Create(
+      RefPtr<ExtendableEventCallback> aCallback) {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+
+    RefPtr<ExtendableEventKeepAliveHandler> self =
+        new ExtendableEventKeepAliveHandler(std::move(aCallback));
+
+    self->mWorkerRef = StrongWorkerRef::Create(
+        GetCurrentThreadWorkerPrivate(), "ExtendableEventKeepAliveHandler",
+        [self]() { self->Cleanup(); });
+
+    if (NS_WARN_IF(!self->mWorkerRef)) {
+      return nullptr;
+    }
+
+    return self;
+  }
+
+  /**
+   * ExtendableEvent::ExtensionsHandler interface
+   */
+  bool WaitOnPromise(Promise& aPromise) override {
+    if (!mAcceptingPromises) {
+      MOZ_ASSERT(!GetDispatchFlag());
+      MOZ_ASSERT(!mSelfRef, "We shouldn't be holding a self reference!");
+      return false;
+    }
+
+    if (!mSelfRef) {
+      MOZ_ASSERT(!mPendingPromisesCount);
+      mSelfRef = this;
+    }
+
+    ++mPendingPromisesCount;
+    aPromise.AppendNativeHandler(this);
+
+    return true;
+  }
+
+  /**
+   * PromiseNativeHandler interface
+   */
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override {
+    RemovePromise(Resolved);
+  }
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override {
+    RemovePromise(Rejected);
+  }
+
+  void MaybeDone() {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+    MOZ_ASSERT(!GetDispatchFlag());
+
+    if (mPendingPromisesCount) {
+      return;
+    }
+
+    if (mCallback) {
+      mCallback->FinishedWithResult(mRejected ? Rejected : Resolved);
+      mCallback = nullptr;
+    }
+
+    Cleanup();
+  }
+
+ private:
+  /**
+   * This class is useful for the case where pending microtasks will continue
+   * extending the event, which means that the event is not "done." For example:
+   *
+   * // `e` is an ExtendableEvent, `p` is a Promise
+   * e.waitUntil(p);
+   * p.then(() => e.waitUntil(otherPromise));
+   */
+  class MaybeDoneRunner : public MicroTaskRunnable {
+   public:
+    explicit MaybeDoneRunner(RefPtr<ExtendableEventKeepAliveHandler> aHandler)
+        : mHandler(std::move(aHandler)) {}
+
+    void Run(AutoSlowOperation& /* unused */) override {
+      mHandler->MaybeDone();
+    }
+
+   private:
+    RefPtr<ExtendableEventKeepAliveHandler> mHandler;
+  };
+
+  explicit ExtendableEventKeepAliveHandler(
+      RefPtr<ExtendableEventCallback> aCallback)
+      : mCallback(std::move(aCallback)) {}
+
+  ~ExtendableEventKeepAliveHandler() { Cleanup(); }
+
+  void Cleanup() {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+
+    if (mCallback) {
+      mCallback->FinishedWithResult(Rejected);
+    }
+
+    mSelfRef = nullptr;
+    mWorkerRef = nullptr;
+    mCallback = nullptr;
+    mAcceptingPromises = false;
+  }
+
+  void RemovePromise(ExtendableEventResult aResult) {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+    MOZ_DIAGNOSTIC_ASSERT(mPendingPromisesCount > 0);
+
+    // NOTE: mSelfRef can be nullptr here if MaybeCleanup() was just called
+    // before a promise settled. This can happen, for example, if the worker
+    // thread is being terminated for running too long, browser shutdown, etc.
+
+    mRejected |= (aResult == Rejected);
+
+    --mPendingPromisesCount;
+    if (mPendingPromisesCount || GetDispatchFlag()) {
+      return;
+    }
+
+    CycleCollectedJSContext* cx = CycleCollectedJSContext::Get();
+    MOZ_ASSERT(cx);
+
+    RefPtr<MaybeDoneRunner> r = new MaybeDoneRunner(this);
+    cx->DispatchToMicroTask(r.forget());
+  }
+
+  /**
+   * We start holding a self reference when the first extension promise is
+   * added, and this reference is released when the last promise settles or
+   * when the worker is shutting down.
+   *
+   * This is needed in the case that we're waiting indefinitely on a to-be-GC'ed
+   * promise that's no longer reachable and will never be settled.
+   */
+  RefPtr<ExtendableEventKeepAliveHandler> mSelfRef;
+
+  RefPtr<StrongWorkerRef> mWorkerRef;
+
+  RefPtr<ExtendableEventCallback> mCallback;
+
+  uint32_t mPendingPromisesCount = 0;
+
+  bool mRejected = false;
+  bool mAcceptingPromises = true;
+};
+
+NS_IMPL_ISUPPORTS0(ExtendableEventKeepAliveHandler)
+
+nsresult DispatchExtendableEventOnWorkerScope(
+    JSContext* aCx, WorkerGlobalScope* aWorkerScope, ExtendableEvent* aEvent,
+    RefPtr<ExtendableEventCallback> aCallback) {
+  MOZ_ASSERT(aCx);
+  MOZ_ASSERT(aWorkerScope);
+  MOZ_ASSERT(aEvent);
+
+  nsCOMPtr<nsIGlobalObject> globalObject = aWorkerScope;
+  WidgetEvent* internalEvent = aEvent->WidgetEventPtr();
+
+  RefPtr<ExtendableEventKeepAliveHandler> keepAliveHandler =
+      ExtendableEventKeepAliveHandler::Create(std::move(aCallback));
+  if (NS_WARN_IF(!keepAliveHandler)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // This must be always set *before* dispatching the event, otherwise
+  // waitUntil() calls will fail.
+  aEvent->SetKeepAliveHandler(keepAliveHandler);
+
+  ErrorResult result;
+  aWorkerScope->DispatchEvent(*aEvent, result);
+  if (NS_WARN_IF(result.Failed())) {
+    result.SuppressException();
+    return NS_ERROR_FAILURE;
+  }
+
+  keepAliveHandler->MaybeDone();
+
+  // We don't block the event when getting an exception but still report the
+  // error message. NOTE: this will not stop the event.
+  if (internalEvent->mFlags.mExceptionWasRaised) {
+    return NS_ERROR_XPC_JS_THREW_EXCEPTION;
+  }
+
+  return NS_OK;
+}
+
+bool DispatchFailed(nsresult aStatus) {
+  return NS_FAILED(aStatus) && aStatus != NS_ERROR_XPC_JS_THREW_EXCEPTION;
+}
+
+}  // anonymous namespace
+
+class ServiceWorkerOp::ServiceWorkerOpRunnable final
+    : public WorkerDebuggeeRunnable {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  ServiceWorkerOpRunnable(RefPtr<ServiceWorkerOp> aOwner,
+                          WorkerPrivate* aWorkerPrivate)
+      : WorkerDebuggeeRunnable(aWorkerPrivate, "ServiceWorkerOpRunnable",
+                               WorkerThread),
+        mOwner(std::move(aOwner)) {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(aWorkerPrivate);
+  }
+
+ private:
+  ~ServiceWorkerOpRunnable() = default;
+
+  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(mOwner);
+
+    if (aWorkerPrivate->GlobalScope()->IsDying()) {
+      Unused << Cancel();
+      return true;
+    }
+
+    bool rv = mOwner->Exec(aCx, aWorkerPrivate);
+    Unused << NS_WARN_IF(!rv);
+    mOwner = nullptr;
+
+    return rv;
+  }
+
+  nsresult Cancel() override {
+    MOZ_ASSERT(mOwner);
+
+    mOwner->RejectAll(NS_ERROR_DOM_ABORT_ERR);
+    mOwner = nullptr;
+
+    return NS_OK;
+  }
+
+  RefPtr<ServiceWorkerOp> mOwner;
+};
+
+NS_IMPL_ISUPPORTS_INHERITED0(ServiceWorkerOp::ServiceWorkerOpRunnable,
+                             WorkerRunnable)
+
+bool ServiceWorkerOp::MaybeStart(RemoteWorkerChild* aOwner,
+                                 RemoteWorkerChild::State& aState) {
+  MOZ_ASSERT(!mStarted);
+  MOZ_ASSERT(aOwner);
+  MOZ_ASSERT(aOwner->GetActorEventTarget()->IsOnCurrentThread());
+
+  auto launcherData = aOwner->mLauncherData.Access();
+
+  if (NS_WARN_IF(!aOwner->CanSend())) {
+    RejectAll(NS_ERROR_DOM_ABORT_ERR);
+    mStarted = true;
+    return true;
+  }
+
+  // Allow termination to happen while the Service Worker is initializing.
+  if (aState.is<Pending>() && !IsTerminationOp()) {
+    return false;
+  }
+
+  if (NS_WARN_IF(aState.is<RemoteWorkerChild::Canceled>()) ||
+      NS_WARN_IF(aState.is<RemoteWorkerChild::Killed>())) {
+    RejectAll(NS_ERROR_DOM_INVALID_STATE_ERR);
+    mStarted = true;
+    return true;
+  }
+
+  MOZ_ASSERT(aState.is<RemoteWorkerChild::Running>() || IsTerminationOp());
+
+  RefPtr<ServiceWorkerOp> self = this;
+
+  if (IsTerminationOp()) {
+    aOwner->GetTerminationPromise()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [self](
+            const GenericNonExclusivePromise::ResolveOrRejectValue& aResult) {
+          MaybeReportServiceWorkerShutdownProgress(self->mArgs, true);
+
+          MOZ_ASSERT(!self->mPromiseHolder.IsEmpty());
+
+          if (NS_WARN_IF(aResult.IsReject())) {
+            self->mPromiseHolder.Reject(aResult.RejectValue(), __func__);
+            return;
+          }
+
+          self->mPromiseHolder.Resolve(NS_OK, __func__);
+        });
+  }
+
+  // NewRunnableMethod doesn't work here because the template does not appear to
+  // be able to deal with the owner argument having storage as a RefPtr but
+  // with the method taking a RefPtr&.
+  RefPtr<RemoteWorkerChild> owner = aOwner;
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__, [self = std::move(self), owner = std::move(owner)]() mutable {
+        self->StartOnMainThread(owner);
+      });
+
+  mStarted = true;
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+  return true;
+}
+
+void ServiceWorkerOp::StartOnMainThread(RefPtr<RemoteWorkerChild>& aOwner) {
+  MaybeReportServiceWorkerShutdownProgress(mArgs);
+
+  {
+    auto lock = aOwner->mState.Lock();
+
+    if (NS_WARN_IF(!lock->is<Running>() && !IsTerminationOp())) {
+      RejectAll(NS_ERROR_DOM_INVALID_STATE_ERR);
+      return;
+    }
+  }
+
+  if (IsTerminationOp()) {
+    aOwner->CloseWorkerOnMainThread();
+  } else {
+    auto lock = aOwner->mState.Lock();
+    MOZ_ASSERT(lock->is<Running>());
+
+    RefPtr<WorkerRunnable> workerRunnable =
+        GetRunnable(lock->as<Running>().mWorkerPrivate);
+
+    if (NS_WARN_IF(!workerRunnable->Dispatch())) {
+      RejectAll(NS_ERROR_FAILURE);
+    }
+  }
+}
+
+void ServiceWorkerOp::Cancel() { RejectAll(NS_ERROR_DOM_ABORT_ERR); }
+
+ServiceWorkerOp::ServiceWorkerOp(
+    ServiceWorkerOpArgs&& aArgs,
+    std::function<void(const ServiceWorkerOpResult&)>&& aCallback)
+    : mArgs(std::move(aArgs)) {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+
+  RefPtr<ServiceWorkerOpPromise> promise = mPromiseHolder.Ensure(__func__);
+
+  promise->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [callback = std::move(aCallback)](
+          ServiceWorkerOpPromise::ResolveOrRejectValue&& aResult) mutable {
+        if (NS_WARN_IF(aResult.IsReject())) {
+          MOZ_ASSERT(NS_FAILED(aResult.RejectValue()));
+          callback(aResult.RejectValue());
+          return;
+        }
+
+        callback(aResult.ResolveValue());
+      });
+}
+
+ServiceWorkerOp::~ServiceWorkerOp() {
+  Unused << NS_WARN_IF(!mPromiseHolder.IsEmpty());
+  mPromiseHolder.RejectIfExists(NS_ERROR_DOM_ABORT_ERR, __func__);
+}
+
+bool ServiceWorkerOp::Started() const {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+
+  return mStarted;
+}
+
+bool ServiceWorkerOp::IsTerminationOp() const {
+  return mArgs.type() ==
+         ServiceWorkerOpArgs::TServiceWorkerTerminateWorkerOpArgs;
+}
+
+RefPtr<WorkerRunnable> ServiceWorkerOp::GetRunnable(
+    WorkerPrivate* aWorkerPrivate) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aWorkerPrivate);
+
+  return new ServiceWorkerOpRunnable(this, aWorkerPrivate);
+}
+
+void ServiceWorkerOp::RejectAll(nsresult aStatus) {
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+  mPromiseHolder.Reject(aStatus, __func__);
+}
+
+class CheckScriptEvaluationOp final : public ServiceWorkerOp {
+  using ServiceWorkerOp::ServiceWorkerOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CheckScriptEvaluationOp, override)
+
+ private:
+  ~CheckScriptEvaluationOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    ServiceWorkerCheckScriptEvaluationOpResult result;
+    result.workerScriptExecutedSuccessfully() =
+        aWorkerPrivate->WorkerScriptExecutedSuccessfully();
+    result.fetchHandlerWasAdded() = aWorkerPrivate->FetchHandlerWasAdded();
+
+    mPromiseHolder.Resolve(result, __func__);
+
+    return true;
+  }
+};
+
+class TerminateServiceWorkerOp final : public ServiceWorkerOp {
+  using ServiceWorkerOp::ServiceWorkerOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TerminateServiceWorkerOp, override)
+
+ private:
+  ~TerminateServiceWorkerOp() = default;
+
+  bool Exec(JSContext*, WorkerPrivate*) override {
+    MOZ_ASSERT_UNREACHABLE(
+        "Worker termination should be handled in "
+        "`ServiceWorkerOp::MaybeStart()`");
+
+    return false;
+  }
+};
+
+class UpdateServiceWorkerStateOp final : public ServiceWorkerOp {
+  using ServiceWorkerOp::ServiceWorkerOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(UpdateServiceWorkerStateOp, override);
+
+ private:
+  class UpdateStateOpRunnable final : public MainThreadWorkerControlRunnable {
+   public:
+    NS_DECL_ISUPPORTS_INHERITED
+
+    UpdateStateOpRunnable(RefPtr<UpdateServiceWorkerStateOp> aOwner,
+                          WorkerPrivate* aWorkerPrivate)
+        : MainThreadWorkerControlRunnable(aWorkerPrivate),
+          mOwner(std::move(aOwner)) {
+      AssertIsOnMainThread();
+      MOZ_ASSERT(mOwner);
+      MOZ_ASSERT(aWorkerPrivate);
+    }
+
+   private:
+    ~UpdateStateOpRunnable() = default;
+
+    bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+      MOZ_ASSERT(aWorkerPrivate);
+      aWorkerPrivate->AssertIsOnWorkerThread();
+      MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+
+      if (mOwner) {
+        Unused << mOwner->Exec(aCx, aWorkerPrivate);
+        mOwner = nullptr;
+      }
+
+      return true;
+    }
+
+    nsresult Cancel() override {
+      MOZ_ASSERT(mOwner);
+
+      mOwner->RejectAll(NS_ERROR_DOM_ABORT_ERR);
+      mOwner = nullptr;
+
+      return NS_OK;
+    }
+
+    RefPtr<UpdateServiceWorkerStateOp> mOwner;
+  };
+
+  ~UpdateServiceWorkerStateOp() = default;
+
+  RefPtr<WorkerRunnable> GetRunnable(WorkerPrivate* aWorkerPrivate) override {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(aWorkerPrivate);
+    MOZ_ASSERT(mArgs.type() ==
+               ServiceWorkerOpArgs::TServiceWorkerUpdateStateOpArgs);
+
+    return new UpdateStateOpRunnable(this, aWorkerPrivate);
+  }
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    ServiceWorkerState state =
+        mArgs.get_ServiceWorkerUpdateStateOpArgs().state();
+    aWorkerPrivate->UpdateServiceWorkerState(state);
+
+    mPromiseHolder.Resolve(NS_OK, __func__);
+
+    return true;
+  }
+};
+
+NS_IMPL_ISUPPORTS_INHERITED0(UpdateServiceWorkerStateOp::UpdateStateOpRunnable,
+                             MainThreadWorkerControlRunnable)
+
+void ExtendableEventOp::FinishedWithResult(ExtendableEventResult aResult) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  mPromiseHolder.Resolve(aResult == Resolved ? NS_OK : NS_ERROR_FAILURE,
+                         __func__);
+}
+
+class LifeCycleEventOp final : public ExtendableEventOp {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(LifeCycleEventOp, override)
+
+ private:
+  ~LifeCycleEventOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    RefPtr<ExtendableEvent> event;
+    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();
+
+    const nsString& eventName =
+        mArgs.get_ServiceWorkerLifeCycleEventOpArgs().eventName();
+
+    if (eventName.EqualsASCII("install") || eventName.EqualsASCII("activate")) {
+      ExtendableEventInit init;
+      init.mBubbles = false;
+      init.mCancelable = false;
+      event = ExtendableEvent::Constructor(target, eventName, init);
+    } else {
+      MOZ_CRASH("Unexpected lifecycle event");
+    }
+
+    event->SetTrusted(true);
+
+    nsresult rv = DispatchExtendableEventOnWorkerScope(
+        aCx, aWorkerPrivate->GlobalScope(), event, this);
+
+    if (NS_WARN_IF(DispatchFailed(rv))) {
+      RejectAll(rv);
+    }
+
+    return !DispatchFailed(rv);
+  }
+};
+
+/**
+ * PushEventOp
+ */
+class PushEventOp final : public ExtendableEventOp {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PushEventOp, override)
+
+ private:
+  ~PushEventOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    ErrorResult result;
+
+    auto scopeExit = MakeScopeExit([&] {
+      MOZ_ASSERT(result.Failed());
+
+      RejectAll(result.StealNSResult());
+      ReportError(aWorkerPrivate);
+    });
+
+    const ServiceWorkerPushEventOpArgs& args =
+        mArgs.get_ServiceWorkerPushEventOpArgs();
+
+    RootedDictionary<PushEventInit> pushEventInit(aCx);
+
+    if (args.data().type() != OptionalPushData::Tvoid_t) {
+      const auto& bytes = args.data().get_ArrayOfuint8_t();
+      JSObject* data = Uint8Array::Create(aCx, bytes, result);
+
+      if (result.Failed()) {
+        return false;
+      }
+
+      DebugOnly<bool> inited =
+          pushEventInit.mData.Construct().SetAsArrayBufferView().Init(data);
+      MOZ_ASSERT(inited);
+    }
+
+    pushEventInit.mBubbles = false;
+    pushEventInit.mCancelable = false;
+
+    GlobalObject globalObj(aCx, aWorkerPrivate->GlobalScope()->GetWrapper());
+    RefPtr<PushEvent> pushEvent =
+        PushEvent::Constructor(globalObj, u"push"_ns, pushEventInit, result);
+
+    if (NS_WARN_IF(result.Failed())) {
+      return false;
+    }
+
+    pushEvent->SetTrusted(true);
+
+    scopeExit.release();
+
+    nsresult rv = DispatchExtendableEventOnWorkerScope(
+        aCx, aWorkerPrivate->GlobalScope(), pushEvent, this);
+
+    if (NS_FAILED(rv)) {
+      if (NS_WARN_IF(DispatchFailed(rv))) {
+        RejectAll(rv);
+      }
+
+      // We don't cancel WorkerPrivate when catching an exception.
+      ReportError(aWorkerPrivate,
+                  nsIPushErrorReporter::DELIVERY_UNCAUGHT_EXCEPTION);
+    }
+
+    return !DispatchFailed(rv);
+  }
+
+  void FinishedWithResult(ExtendableEventResult aResult) override {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+
+    if (aResult == Rejected) {
+      ReportError(workerPrivate,
+                  nsIPushErrorReporter::DELIVERY_UNHANDLED_REJECTION);
+    }
+
+    ExtendableEventOp::FinishedWithResult(aResult);
+  }
+
+  void ReportError(
+      WorkerPrivate* aWorkerPrivate,
+      uint16_t aError = nsIPushErrorReporter::DELIVERY_INTERNAL_ERROR) {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+
+    if (NS_WARN_IF(aError > nsIPushErrorReporter::DELIVERY_INTERNAL_ERROR) ||
+        mArgs.get_ServiceWorkerPushEventOpArgs().messageId().IsEmpty()) {
+      return;
+    }
+
+    nsString messageId = mArgs.get_ServiceWorkerPushEventOpArgs().messageId();
+    nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+        __func__, [messageId = std::move(messageId), error = aError] {
+          nsCOMPtr<nsIPushErrorReporter> reporter =
+              do_GetService("@mozilla.org/push/Service;1");
+
+          if (reporter) {
+            nsresult rv = reporter->ReportDeliveryError(messageId, error);
+            Unused << NS_WARN_IF(NS_FAILED(rv));
+          }
+        });
+
+    MOZ_ALWAYS_SUCCEEDS(aWorkerPrivate->DispatchToMainThread(r.forget()));
+  }
+};
+
+class PushSubscriptionChangeEventOp final : public ExtendableEventOp {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PushSubscriptionChangeEventOp, override)
+
+ private:
+  ~PushSubscriptionChangeEventOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();
+
+    ExtendableEventInit init;
+    init.mBubbles = false;
+    init.mCancelable = false;
+
+    RefPtr<ExtendableEvent> event = ExtendableEvent::Constructor(
+        target, u"pushsubscriptionchange"_ns, init);
+    event->SetTrusted(true);
+
+    nsresult rv = DispatchExtendableEventOnWorkerScope(
+        aCx, aWorkerPrivate->GlobalScope(), event, this);
+
+    if (NS_WARN_IF(DispatchFailed(rv))) {
+      RejectAll(rv);
+    }
+
+    return !DispatchFailed(rv);
+  }
+};
+
+class NotificationEventOp : public ExtendableEventOp,
+                            public nsITimerCallback,
+                            public nsINamed {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+ private:
+  ~NotificationEventOp() {
+    MOZ_DIAGNOSTIC_ASSERT(!mTimer);
+    MOZ_DIAGNOSTIC_ASSERT(!mWorkerRef);
+  }
+
+  void ClearWindowAllowed(WorkerPrivate* aWorkerPrivate) {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+
+    if (!mTimer) {
+      return;
+    }
+
+    // This might be executed after the global was unrooted, in which case
+    // GlobalScope() will return null. Making the check here just to be safe.
+    WorkerGlobalScope* globalScope = aWorkerPrivate->GlobalScope();
+    if (!globalScope) {
+      return;
+    }
+
+    globalScope->ConsumeWindowInteraction();
+    mTimer->Cancel();
+    mTimer = nullptr;
+
+    mWorkerRef = nullptr;
+  }
+
+  void StartClearWindowTimer(WorkerPrivate* aWorkerPrivate) {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(!mTimer);
+
+    nsresult rv;
+    nsCOMPtr<nsITimer> timer =
+        NS_NewTimer(aWorkerPrivate->ControlEventTarget());
+    if (NS_WARN_IF(!timer)) {
+      return;
+    }
+
+    MOZ_ASSERT(!mWorkerRef);
+    RefPtr<NotificationEventOp> self = this;
+    mWorkerRef = StrongWorkerRef::Create(
+        aWorkerPrivate, "NotificationEventOp", [self = std::move(self)] {
+          // We could try to hold the worker alive until the timer fires, but
+          // other APIs are not likely to work in this partially shutdown state.
+          // We might as well let the worker thread exit.
+          self->ClearWindowAllowed(self->mWorkerRef->Private());
+        });
+
+    if (!mWorkerRef) {
+      return;
+    }
+
+    aWorkerPrivate->GlobalScope()->AllowWindowInteraction();
+    timer.swap(mTimer);
+
+    // We swap first and then initialize the timer so that even if initializing
+    // fails, we still clean the interaction count correctly.
+    uint32_t delay = mArgs.get_ServiceWorkerNotificationEventOpArgs()
+                         .disableOpenClickDelay();
+    rv = mTimer->InitWithCallback(this, delay, nsITimer::TYPE_ONE_SHOT);
+
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      ClearWindowAllowed(aWorkerPrivate);
+      return;
+    }
+  }
+
+  // ExtendableEventOp interface
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();
+
+    ServiceWorkerNotificationEventOpArgs& args =
+        mArgs.get_ServiceWorkerNotificationEventOpArgs();
+
+    auto result = Notification::ConstructFromFields(
+        aWorkerPrivate->GlobalScope(), args.id(), args.title(), args.dir(),
+        args.lang(), args.body(), args.tag(), args.icon(), args.data(),
+        args.scope());
+
+    if (NS_WARN_IF(result.isErr())) {
+      return false;
+    }
+
+    NotificationEventInit init;
+    init.mNotification = result.unwrap();
+    init.mBubbles = false;
+    init.mCancelable = false;
+
+    RefPtr<NotificationEvent> notificationEvent =
+        NotificationEvent::Constructor(target, args.eventName(), init);
+
+    notificationEvent->SetTrusted(true);
+
+    if (args.eventName().EqualsLiteral("notificationclick")) {
+      StartClearWindowTimer(aWorkerPrivate);
+    }
+
+    nsresult rv = DispatchExtendableEventOnWorkerScope(
+        aCx, aWorkerPrivate->GlobalScope(), notificationEvent, this);
+
+    if (NS_WARN_IF(DispatchFailed(rv))) {
+      // This will reject mPromiseHolder.
+      FinishedWithResult(Rejected);
+    }
+
+    return !DispatchFailed(rv);
+  }
+
+  void FinishedWithResult(ExtendableEventResult aResult) override {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(workerPrivate);
+
+    ClearWindowAllowed(workerPrivate);
+
+    ExtendableEventOp::FinishedWithResult(aResult);
+  }
+
+  // nsITimerCallback interface
+  NS_IMETHOD Notify(nsITimer* aTimer) override {
+    MOZ_DIAGNOSTIC_ASSERT(mTimer == aTimer);
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    ClearWindowAllowed(workerPrivate);
+    return NS_OK;
+  }
+
+  // nsINamed interface
+  NS_IMETHOD GetName(nsACString& aName) override {
+    aName.AssignLiteral("NotificationEventOp");
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsITimer> mTimer;
+  RefPtr<StrongWorkerRef> mWorkerRef;
+};
+
+NS_IMPL_ISUPPORTS(NotificationEventOp, nsITimerCallback, nsINamed)
+
+class MessageEventOp final : public ExtendableEventOp {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MessageEventOp, override)
+
+  MessageEventOp(ServiceWorkerOpArgs&& aArgs,
+                 std::function<void(const ServiceWorkerOpResult&)>&& aCallback)
+      : ExtendableEventOp(std::move(aArgs), std::move(aCallback)),
+        mData(new ServiceWorkerCloneData()) {
+    mData->CopyFromClonedMessageData(
+        mArgs.get_ServiceWorkerMessageEventOpArgs().clonedData());
+  }
+
+ private:
+  ~MessageEventOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    JS::Rooted<JS::Value> messageData(aCx);
+    nsCOMPtr<nsIGlobalObject> sgo = aWorkerPrivate->GlobalScope();
+    ErrorResult rv;
+    if (!mData->IsErrorMessageData()) {
+      mData->Read(aCx, &messageData, rv);
+    }
+
+    // If mData is an error message data, then it means that it failed to
+    // serialize on the caller side because it contains a shared memory object.
+    // If deserialization fails, we will fire a messageerror event.
+    const bool deserializationFailed =
+        rv.Failed() || mData->IsErrorMessageData();
+
+    Sequence<OwningNonNull<MessagePort>> ports;
+    if (!mData->TakeTransferredPortsAsSequence(ports)) {
+      RejectAll(NS_ERROR_FAILURE);
+      rv.SuppressException();
+      return false;
+    }
+
+    RootedDictionary<ExtendableMessageEventInit> init(aCx);
+
+    init.mBubbles = false;
+    init.mCancelable = false;
+
+    // On a messageerror event, we disregard ports:
+    // https://w3c.github.io/ServiceWorker/#service-worker-postmessage
+    if (!deserializationFailed) {
+      init.mData = messageData;
+      init.mPorts = std::move(ports);
+    }
+
+    nsCOMPtr<nsIURI> url;
+    nsresult result = NS_NewURI(getter_AddRefs(url),
+                                mArgs.get_ServiceWorkerMessageEventOpArgs()
+                                    .clientInfoAndState()
+                                    .info()
+                                    .url());
+    if (NS_WARN_IF(NS_FAILED(result))) {
+      RejectAll(result);
+      rv.SuppressException();
+      return false;
+    }
+
+    OriginAttributes attrs;
+    nsCOMPtr<nsIPrincipal> principal =
+        BasePrincipal::CreateContentPrincipal(url, attrs);
+    if (!principal) {
+      return false;
+    }
+
+    nsCString origin;
+    result = principal->GetOriginNoSuffix(origin);
+    if (NS_WARN_IF(NS_FAILED(result))) {
+      RejectAll(result);
+      rv.SuppressException();
+      return false;
+    }
+
+    CopyUTF8toUTF16(origin, init.mOrigin);
+
+    init.mSource.SetValue().SetAsClient() = new Client(
+        sgo, mArgs.get_ServiceWorkerMessageEventOpArgs().clientInfoAndState());
+
+    rv.SuppressException();
+    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();
+    RefPtr<ExtendableMessageEvent> extendableEvent =
+        ExtendableMessageEvent::Constructor(
+            target, deserializationFailed ? u"messageerror"_ns : u"message"_ns,
+            init);
+
+    extendableEvent->SetTrusted(true);
+
+    nsresult rv2 = DispatchExtendableEventOnWorkerScope(
+        aCx, aWorkerPrivate->GlobalScope(), extendableEvent, this);
+
+    if (NS_WARN_IF(DispatchFailed(rv2))) {
+      RejectAll(rv2);
+    }
+
+    return !DispatchFailed(rv2);
+  }
+
+  RefPtr<ServiceWorkerCloneData> mData;
+};
+
+/**
+ * Used for ScopeExit-style network request cancelation in
+ * `ResolvedCallback()` (e.g. if `FetchEvent::RespondWith()` is resolved with
+ * a non-JS object).
+ */
+class MOZ_STACK_CLASS FetchEventOp::AutoCancel {
+ public:
+  explicit AutoCancel(FetchEventOp* aOwner)
+      : mOwner(aOwner),
+        mLine(0),
+        mColumn(0),
+        mMessageName("InterceptionFailedWithURL"_ns) {
+    MOZ_ASSERT(IsCurrentThreadRunningWorker());
+    MOZ_ASSERT(mOwner);
+
+    nsAutoString requestURL;
+    mOwner->GetRequestURL(requestURL);
+    mParams.AppendElement(requestURL);
+  }
+
+  ~AutoCancel() {
+    if (mOwner) {
+      if (mSourceSpec.IsEmpty()) {
+        mOwner->AsyncLog(mMessageName, std::move(mParams));
+      } else {
+        mOwner->AsyncLog(mSourceSpec, mLine, mColumn, mMessageName,
+                         std::move(mParams));
+      }
+
+      MOZ_ASSERT(!mOwner->mRespondWithPromiseHolder.IsEmpty());
+      mOwner->mHandled->MaybeRejectWithNetworkError("AutoCancel"_ns);
+      mOwner->mRespondWithPromiseHolder.Reject(
+          CancelInterceptionArgs(
+              NS_ERROR_INTERCEPTION_FAILED,
+              FetchEventTimeStamps(mOwner->mFetchHandlerStart,
+                                   mOwner->mFetchHandlerFinish)),
+          __func__);
+    }
+  }
+
+  // This function steals the error message from a ErrorResult.
+  void SetCancelErrorResult(JSContext* aCx, ErrorResult& aRv) {
+    MOZ_DIAGNOSTIC_ASSERT(aRv.Failed());
+    MOZ_DIAGNOSTIC_ASSERT(!JS_IsExceptionPending(aCx));
+
+    // Storing the error as exception in the JSContext.
+    if (!aRv.MaybeSetPendingException(aCx)) {
+      return;
+    }
+
+    MOZ_ASSERT(!aRv.Failed());
+
+    // Let's take the pending exception.
+    JS::ExceptionStack exnStack(aCx);
+    if (!JS::StealPendingExceptionStack(aCx, &exnStack)) {
+      return;
+    }
+
+    // Converting the exception in a JS::ErrorReportBuilder.
+    JS::ErrorReportBuilder report(aCx);
+    if (!report.init(aCx, exnStack, JS::ErrorReportBuilder::WithSideEffects)) {
+      JS_ClearPendingException(aCx);
+      return;
+    }
+
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+
+    // Let's store the error message here.
+    mMessageName.Assign(report.toStringResult().c_str());
+    mParams.Clear();
+  }
+
+  template <typename... Params>
+  void SetCancelMessage(const nsACString& aMessageName, Params&&... aParams) {
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+    mMessageName = aMessageName;
+    mParams.Clear();
+    StringArrayAppender::Append(mParams, sizeof...(Params),
+                                std::forward<Params>(aParams)...);
+  }
+
+  template <typename... Params>
+  void SetCancelMessageAndLocation(const nsACString& aSourceSpec,
+                                   uint32_t aLine, uint32_t aColumn,
+                                   const nsACString& aMessageName,
+                                   Params&&... aParams) {
+    MOZ_ASSERT(mOwner);
+    MOZ_ASSERT(mMessageName.EqualsLiteral("InterceptionFailedWithURL"));
+    MOZ_ASSERT(mParams.Length() == 1);
+
+    mSourceSpec = aSourceSpec;
+    mLine = aLine;
+    mColumn = aColumn;
+
+    mMessageName = aMessageName;
+    mParams.Clear();
+    StringArrayAppender::Append(mParams, sizeof...(Params),
+                                std::forward<Params>(aParams)...);
+  }
+
+  void Reset() { mOwner = nullptr; }
+
+ private:
+  FetchEventOp* MOZ_NON_OWNING_REF mOwner;
+  nsCString mSourceSpec;
+  uint32_t mLine;
+  uint32_t mColumn;
+  nsCString mMessageName;
+  nsTArray<nsString> mParams;
+};
+
+NS_IMPL_ISUPPORTS0(FetchEventOp)
+
+void FetchEventOp::SetActor(RefPtr<FetchEventOpProxyChild> aActor) {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+  MOZ_ASSERT(!Started());
+  MOZ_ASSERT(!mActor);
+
+  mActor = std::move(aActor);
+}
+
+void FetchEventOp::RevokeActor(FetchEventOpProxyChild* aActor) {
+  MOZ_ASSERT(aActor);
+  MOZ_ASSERT_IF(mActor, mActor == aActor);
+
+  mActor = nullptr;
+}
+
+RefPtr<FetchEventRespondWithPromise> FetchEventOp::GetRespondWithPromise() {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+  MOZ_ASSERT(!Started());
+  MOZ_ASSERT(mRespondWithPromiseHolder.IsEmpty());
+
+  return mRespondWithPromiseHolder.Ensure(__func__);
+}
+
+void FetchEventOp::RespondWithCalledAt(const nsCString& aRespondWithScriptSpec,
+                                       uint32_t aRespondWithLineNumber,
+                                       uint32_t aRespondWithColumnNumber) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(!mRespondWithClosure);
+
+  mRespondWithClosure.emplace(aRespondWithScriptSpec, aRespondWithLineNumber,
+                              aRespondWithColumnNumber);
+}
+
+void FetchEventOp::ReportCanceled(const nsCString& aPreventDefaultScriptSpec,
+                                  uint32_t aPreventDefaultLineNumber,
+                                  uint32_t aPreventDefaultColumnNumber) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  nsString requestURL;
+  GetRequestURL(requestURL);
+
+  AsyncLog(aPreventDefaultScriptSpec, aPreventDefaultLineNumber,
+           aPreventDefaultColumnNumber, "InterceptionCanceledWithURL"_ns,
+           {std::move(requestURL)});
+}
+
+FetchEventOp::~FetchEventOp() {
+  mRespondWithPromiseHolder.RejectIfExists(
+      CancelInterceptionArgs(
+          NS_ERROR_DOM_ABORT_ERR,
+          FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish)),
+      __func__);
+}
+
+void FetchEventOp::RejectAll(nsresult aStatus) {
+  MOZ_ASSERT(!mRespondWithPromiseHolder.IsEmpty());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  if (mFetchHandlerStart.IsNull()) {
+    mFetchHandlerStart = TimeStamp::Now();
+  }
+  if (mFetchHandlerFinish.IsNull()) {
+    mFetchHandlerFinish = TimeStamp::Now();
+  }
+
+  mRespondWithPromiseHolder.Reject(
+      CancelInterceptionArgs(
+          aStatus,
+          FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish)),
+      __func__);
+  mPromiseHolder.Reject(aStatus, __func__);
+}
+
+void FetchEventOp::FinishedWithResult(ExtendableEventResult aResult) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+  MOZ_ASSERT(!mResult);
+
+  mResult.emplace(aResult);
+
+  /**
+   * This should only return early if neither waitUntil() nor respondWith()
+   * are called. The early return is so that mRespondWithPromiseHolder has a
+   * chance to settle before mPromiseHolder does.
+   */
+  if (!mPostDispatchChecksDone) {
+    return;
+  }
+
+  MaybeFinished();
+}
+
+void FetchEventOp::MaybeFinished() {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  if (mResult) {
+    // It's possible that mRespondWithPromiseHolder wasn't settled. That happens
+    // if the worker was terminated before the respondWith promise settled.
+
+    mHandled = nullptr;
+    mPreloadResponse = nullptr;
+    mPreloadResponseAvailablePromiseRequestHolder.DisconnectIfExists();
+    mPreloadResponseTimingPromiseRequestHolder.DisconnectIfExists();
+    mPreloadResponseEndPromiseRequestHolder.DisconnectIfExists();
+
+    ServiceWorkerFetchEventOpResult result(
+        mResult.value() == Resolved ? NS_OK : NS_ERROR_FAILURE);
+
+    mPromiseHolder.Resolve(result, __func__);
+  }
+}
+
+bool FetchEventOp::Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) {
+  aWorkerPrivate->AssertIsOnWorkerThread();
+  MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+  MOZ_ASSERT(!mRespondWithPromiseHolder.IsEmpty());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  nsresult rv = DispatchFetchEvent(aCx, aWorkerPrivate);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    RejectAll(rv);
+  }
+
+  return NS_SUCCEEDED(rv);
+}
+
+void FetchEventOp::AsyncLog(const nsCString& aMessageName,
+                            nsTArray<nsString> aParams) {
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+  MOZ_ASSERT(mRespondWithClosure);
+
+  const FetchEventRespondWithClosure& closure = mRespondWithClosure.ref();
+
+  AsyncLog(closure.respondWithScriptSpec(), closure.respondWithLineNumber(),
+           closure.respondWithColumnNumber(), aMessageName, std::move(aParams));
+}
+
+void FetchEventOp::AsyncLog(const nsCString& aScriptSpec, uint32_t aLineNumber,
+                            uint32_t aColumnNumber,
+                            const nsCString& aMessageName,
+                            nsTArray<nsString> aParams) {
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  // Capture `this` because FetchEventOpProxyChild (mActor) is not thread
+  // safe, so an AddRef from RefPtr<FetchEventOpProxyChild>'s constructor will
+  // assert.
+  RefPtr<FetchEventOp> self = this;
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__, [self = std::move(self), spec = aScriptSpec, line = aLineNumber,
+                 column = aColumnNumber, messageName = aMessageName,
+                 params = std::move(aParams)] {
+        if (NS_WARN_IF(!self->mActor)) {
+          return;
+        }
+
+        Unused << self->mActor->SendAsyncLog(spec, line, column, messageName,
+                                             params);
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(
+      RemoteWorkerService::Thread()->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
+}
+
+void FetchEventOp::GetRequestURL(nsAString& aOutRequestURL) {
+  nsTArray<nsCString>& urls =
+      mArgs.get_ParentToChildServiceWorkerFetchEventOpArgs()
+          .common()
+          .internalRequest()
+          .urlList();
+  MOZ_ASSERT(!urls.IsEmpty());
+
+  CopyUTF8toUTF16(urls.LastElement(), aOutRequestURL);
+}
+
+void FetchEventOp::ResolvedCallback(JSContext* aCx,
+                                    JS::Handle<JS::Value> aValue,
+                                    ErrorResult& aRv) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(mRespondWithClosure);
+  MOZ_ASSERT(!mRespondWithPromiseHolder.IsEmpty());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  mFetchHandlerFinish = TimeStamp::Now();
+
+  nsAutoString requestURL;
+  GetRequestURL(requestURL);
+
+  AutoCancel autoCancel(this);
+
+  if (!aValue.isObject()) {
+    NS_WARNING(
+        "FetchEvent::RespondWith was passed a promise resolved to a "
+        "non-Object "
+        "value");
+
+    nsCString sourceSpec;
+    uint32_t line = 0;
+    uint32_t column = 0;
+    nsString valueString;
+    nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                       valueString);
+
+    autoCancel.SetCancelMessageAndLocation(sourceSpec, line, column,
+                                           "InterceptedNonResponseWithURL"_ns,
+                                           requestURL, valueString);
+    return;
+  }
+
+  RefPtr<Response> response;
+  nsresult rv = UNWRAP_OBJECT(Response, &aValue.toObject(), response);
+  if (NS_FAILED(rv)) {
+    nsCString sourceSpec;
+    uint32_t line = 0;
+    uint32_t column = 0;
+    nsString valueString;
+    nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                       valueString);
+
+    autoCancel.SetCancelMessageAndLocation(sourceSpec, line, column,
+                                           "InterceptedNonResponseWithURL"_ns,
+                                           requestURL, valueString);
+    return;
+  }
+
+  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(worker);
+  worker->AssertIsOnWorkerThread();
+
+  // Section "HTTP Fetch", step 3.3:
+  //  If one of the following conditions is true, return a network error:
+  //    * response's type is "error".
+  //    * request's mode is not "no-cors" and response's type is "opaque".
+  //    * request's redirect mode is not "manual" and response's type is
+  //      "opaqueredirect".
+  //    * request's redirect mode is not "follow" and response's url list
+  //      has more than one item.
+
+  if (response->Type() == ResponseType::Error) {
+    autoCancel.SetCancelMessage("InterceptedErrorResponseWithURL"_ns,
+                                requestURL);
+    return;
+  }
+
+  const ParentToChildServiceWorkerFetchEventOpArgs& args =
+      mArgs.get_ParentToChildServiceWorkerFetchEventOpArgs();
+  const RequestMode requestMode = args.common().internalRequest().requestMode();
+
+  if (response->Type() == ResponseType::Opaque &&
+      requestMode != RequestMode::No_cors) {
+    NS_ConvertASCIItoUTF16 modeString(
+        RequestModeValues::GetString(requestMode));
+
+    nsAutoString requestURL;
+    GetRequestURL(requestURL);
+
+    autoCancel.SetCancelMessage("BadOpaqueInterceptionRequestModeWithURL"_ns,
+                                requestURL, modeString);
+    return;
+  }
+
+  const RequestRedirect requestRedirectMode =
+      args.common().internalRequest().requestRedirect();
+
+  if (requestRedirectMode != RequestRedirect::Manual &&
+      response->Type() == ResponseType::Opaqueredirect) {
+    autoCancel.SetCancelMessage("BadOpaqueRedirectInterceptionWithURL"_ns,
+                                requestURL);
+    return;
+  }
+
+  if (requestRedirectMode != RequestRedirect::Follow &&
+      response->Redirected()) {
+    autoCancel.SetCancelMessage("BadRedirectModeInterceptionWithURL"_ns,
+                                requestURL);
+    return;
+  }
+
+  if (NS_WARN_IF(response->BodyUsed())) {
+    autoCancel.SetCancelMessage("InterceptedUsedResponseWithURL"_ns,
+                                requestURL);
+    return;
+  }
+
+  SafeRefPtr<InternalResponse> ir = response->GetInternalResponse();
+  if (NS_WARN_IF(!ir)) {
+    return;
+  }
+
+  // An extra safety check to make sure our invariant that opaque and cors
+  // responses always have a URL does not break.
+  if (NS_WARN_IF((response->Type() == ResponseType::Opaque ||
+                  response->Type() == ResponseType::Cors) &&
+                 ir->GetUnfilteredURL().IsEmpty())) {
+    MOZ_DIAGNOSTIC_ASSERT(false, "Cors or opaque Response without a URL");
+    return;
+  }
+
+  if (requestMode == RequestMode::Same_origin &&
+      response->Type() == ResponseType::Cors) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::SW_CORS_RES_FOR_SO_REQ_COUNT, 1);
+
+    // XXXtt: Will have a pref to enable the quirk response in bug 1419684.
+    // The variadic template provided by StringArrayAppender requires exactly
+    // an nsString.
+    NS_ConvertUTF8toUTF16 responseURL(ir->GetUnfilteredURL());
+    autoCancel.SetCancelMessage("CorsResponseForSameOriginRequest"_ns,
+                                requestURL, responseURL);
+    return;
+  }
+
+  nsCOMPtr<nsIInputStream> body;
+  ir->GetUnfilteredBody(getter_AddRefs(body));
+  // Errors and redirects may not have a body.
+  if (body) {
+    ErrorResult error;
+    response->SetBodyUsed(aCx, error);
+    error.WouldReportJSException();
+    if (NS_WARN_IF(error.Failed())) {
+      autoCancel.SetCancelErrorResult(aCx, error);
+      return;
+    }
+  }
+
+  if (!ir->GetChannelInfo().IsInitialized()) {
+    // This is a synthetic response (I think and hope so).
+    ir->InitChannelInfo(worker->GetChannelInfo());
+  }
+
+  autoCancel.Reset();
+
+  // https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm Step 26: If
+  // eventHandled is not null, then resolve eventHandled.
+  //
+  // mRespondWithPromiseHolder will resolve a MozPromise that will resolve on
+  // the worker owner's thread, so it's fine to resolve the mHandled promise now
+  // because content will not interfere with respondWith getting the Response to
+  // where it's going.
+  mHandled->MaybeResolveWithUndefined();
+  mRespondWithPromiseHolder.Resolve(
+      FetchEventRespondWithResult(std::make_tuple(
+          std::move(ir), mRespondWithClosure.ref(),
+          FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish))),
+      __func__);
+}
+
+void FetchEventOp::RejectedCallback(JSContext* aCx,
+                                    JS::Handle<JS::Value> aValue,
+                                    ErrorResult& aRv) {
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  MOZ_ASSERT(mRespondWithClosure);
+  MOZ_ASSERT(!mRespondWithPromiseHolder.IsEmpty());
+  MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+  mFetchHandlerFinish = TimeStamp::Now();
+
+  FetchEventRespondWithClosure& closure = mRespondWithClosure.ref();
+
+  nsCString sourceSpec = closure.respondWithScriptSpec();
+  uint32_t line = closure.respondWithLineNumber();
+  uint32_t column = closure.respondWithColumnNumber();
+  nsString valueString;
+
+  nsContentUtils::ExtractErrorValues(aCx, aValue, sourceSpec, &line, &column,
+                                     valueString);
+
+  nsString requestURL;
+  GetRequestURL(requestURL);
+
+  AsyncLog(sourceSpec, line, column, "InterceptionRejectedResponseWithURL"_ns,
+           {std::move(requestURL), valueString});
+
+  // https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm Step 25.1:
+  // If eventHandled is not null, then reject eventHandled with a "NetworkError"
+  // DOMException in workerRealm.
+  mHandled->MaybeRejectWithNetworkError(
+      "FetchEvent.respondWith() Promise rejected"_ns);
+  mRespondWithPromiseHolder.Resolve(
+      FetchEventRespondWithResult(CancelInterceptionArgs(
+          NS_ERROR_INTERCEPTION_FAILED,
+          FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish))),
+      __func__);
+}
+
+nsresult FetchEventOp::DispatchFetchEvent(JSContext* aCx,
+                                          WorkerPrivate* aWorkerPrivate) {
+  MOZ_ASSERT(aCx);
+  MOZ_ASSERT(aWorkerPrivate);
+  aWorkerPrivate->AssertIsOnWorkerThread();
+  MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+
+  ParentToChildServiceWorkerFetchEventOpArgs& args =
+      mArgs.get_ParentToChildServiceWorkerFetchEventOpArgs();
+
+  /**
+   * Testing: Failure injection.
+   *
+   * There are a number of different ways that this fetch event could have
+   * failed that would result in cancellation.  This injection point helps
+   * simulate them without worrying about shifting implementation details with
+   * full fidelity reproductions of current scenarios.
+   *
+   * Broadly speaking, we expect fetch event scenarios to fail because of:
+   * - Script load failure, which results in the CompileScriptRunnable closing
+   *   the worker and thereby cancelling all pending operations, including this
+   *   fetch.  The `ServiceWorkerOp::Cancel` impl just calls
+   *   RejectAll(NS_ERROR_DOM_ABORT_ERR) which we are able to approximate by
+   *   returning the same nsresult here, as our caller also calls RejectAll.
+   *   (And timing-wise, this rejection will happen in the correct sequence.)
+   * - An exception gets thrown in the processing of the promise that was passed
+   *   to respondWith and it ends up rejecting.  The rejection will be converted
+   *   by `FetchEventOp::RejectedCallback` into a cancellation with
+   *   NS_ERROR_INTERCEPTION_FAILED, and by returning that here we approximate
+   *   that failure mode.
+   */
+  if (NS_FAILED(args.common().testingInjectCancellation())) {
+    return args.common().testingInjectCancellation();
+  }
+
+  /**
+   * Step 1: get the InternalRequest. The InternalRequest can't be constructed
+   * here from mArgs because the IPCStream has to be deserialized on the
+   * thread receiving the ServiceWorkerFetchEventOpArgs.
+   * FetchEventOpProxyChild will have already deserialized the stream on the
+   * correct thread before creating this op, so we can take its saved
+   * InternalRequest.
+   */
+  SafeRefPtr<InternalRequest> internalRequest =
+      mActor->ExtractInternalRequest();
+
+  /**
+   * Step 2: get the worker's global object
+   */
+  GlobalObject globalObject(aCx, aWorkerPrivate->GlobalScope()->GetWrapper());
+  nsCOMPtr<nsIGlobalObject> globalObjectAsSupports =
+      do_QueryInterface(globalObject.GetAsSupports());
+  if (NS_WARN_IF(!globalObjectAsSupports)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  /**
+   * Step 3: create the public DOM Request object
+   * TODO: this Request object should be created with an AbortSignal object
+   * which should be aborted if the loading is aborted. See but 1394102.
+   */
+  RefPtr<Request> request =
+      new Request(globalObjectAsSupports, internalRequest.clonePtr(), nullptr);
+  MOZ_ASSERT_IF(internalRequest->IsNavigationRequest(),
+                request->Redirect() == RequestRedirect::Manual);
+
+  /**
+   * Step 4a: create the FetchEventInit
+   */
+  RootedDictionary<FetchEventInit> fetchEventInit(aCx);
+  fetchEventInit.mRequest = request;
+  fetchEventInit.mBubbles = false;
+  fetchEventInit.mCancelable = true;
+
+  /**
+   * TODO: only expose the FetchEvent.clientId on subresource requests for
+   * now. Once we implement .targetClientId we can then start exposing
+   * .clientId on non-subresource requests as well.  See bug 1487534.
+   */
+  if (!args.common().clientId().IsEmpty() &&
+      !internalRequest->IsNavigationRequest()) {
+    fetchEventInit.mClientId = args.common().clientId();
+  }
+
+  /*
+   * https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm
+   *
+   * "If request is a non-subresource request and request’s
+   * destination is not "report", initialize e’s resultingClientId attribute
+   * to reservedClient’s [resultingClient's] id, and to the empty string
+   * otherwise." (Step 18.8)
+   */
+  if (!args.common().resultingClientId().IsEmpty() &&
+      args.common().isNonSubresourceRequest() &&
+      internalRequest->Destination() != RequestDestination::Report) {
+    fetchEventInit.mResultingClientId = args.common().resultingClientId();
+  }
+
+  /**
+   * Step 4b: create the FetchEvent
+   */
+  RefPtr<FetchEvent> fetchEvent =
+      FetchEvent::Constructor(globalObject, u"fetch"_ns, fetchEventInit);
+  fetchEvent->SetTrusted(true);
+  fetchEvent->PostInit(args.common().workerScriptSpec(), this);
+  mHandled = fetchEvent->Handled();
+  mPreloadResponse = fetchEvent->PreloadResponse();
+
+  if (args.common().preloadNavigation()) {
+    RefPtr<FetchEventPreloadResponseAvailablePromise> preloadResponsePromise =
+        mActor->GetPreloadResponseAvailablePromise();
+    MOZ_ASSERT(preloadResponsePromise);
+
+    // If preloadResponsePromise has already settled then this callback will get
+    // run synchronously here.
+    RefPtr<FetchEventOp> self = this;
+    preloadResponsePromise
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [self, globalObjectAsSupports](
+                SafeRefPtr<InternalResponse>&& aPreloadResponse) {
+              self->mPreloadResponse->MaybeResolve(
+                  MakeRefPtr<Response>(globalObjectAsSupports,
+                                       std::move(aPreloadResponse), nullptr));
+              self->mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            },
+            [self](int) {
+              self->mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseAvailablePromiseRequestHolder);
+
+    RefPtr<PerformanceStorage> performanceStorage =
+        aWorkerPrivate->GetPerformanceStorage();
+
+    RefPtr<FetchEventPreloadResponseTimingPromise>
+        preloadResponseTimingPromise =
+            mActor->GetPreloadResponseTimingPromise();
+    MOZ_ASSERT(preloadResponseTimingPromise);
+    preloadResponseTimingPromise
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [self, performanceStorage,
+             globalObjectAsSupports](ResponseTiming&& aTiming) {
+              if (performanceStorage && !aTiming.entryName().IsEmpty() &&
+                  aTiming.initiatorType().Equals(u"navigation"_ns)) {
+                performanceStorage->AddEntry(
+                    aTiming.entryName(), aTiming.initiatorType(),
+                    MakeUnique<PerformanceTimingData>(aTiming.timingData()));
+              }
+              self->mPreloadResponseTimingPromiseRequestHolder.Complete();
+            },
+            [self](int) {
+              self->mPreloadResponseTimingPromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseTimingPromiseRequestHolder);
+
+    RefPtr<FetchEventPreloadResponseEndPromise> preloadResponseEndPromise =
+        mActor->GetPreloadResponseEndPromise();
+    MOZ_ASSERT(preloadResponseEndPromise);
+    preloadResponseEndPromise
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [self, globalObjectAsSupports](ResponseEndArgs&& aArgs) {
+              if (aArgs.endReason() == FetchDriverObserver::eAborted) {
+                self->mPreloadResponse->MaybeReject(NS_ERROR_DOM_ABORT_ERR);
+              }
+              self->mPreloadResponseEndPromiseRequestHolder.Complete();
+            },
+            [self](int) {
+              self->mPreloadResponseEndPromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseEndPromiseRequestHolder);
+  } else {
+    // preload navigation is disabled, resolved preload response promise with
+    // undefined as default behavior.
+    mPreloadResponse->MaybeResolveWithUndefined();
+  }
+
+  mFetchHandlerStart = TimeStamp::Now();
+
+  /**
+   * Step 5: Dispatch the FetchEvent to the worker's global object
+   */
+  nsresult rv = DispatchExtendableEventOnWorkerScope(
+      aCx, aWorkerPrivate->GlobalScope(), fetchEvent, this);
+  bool dispatchFailed = NS_FAILED(rv) && rv != NS_ERROR_XPC_JS_THREW_EXCEPTION;
+
+  if (NS_WARN_IF(dispatchFailed)) {
+    mHandled = nullptr;
+    mPreloadResponse = nullptr;
+    return rv;
+  }
+
+  /**
+   * At this point, there are 4 (legal) scenarios:
+   *
+   * 1) If neither waitUntil() nor respondWith() are called,
+   * DispatchExtendableEventOnWorkerScope() will have already called
+   * FinishedWithResult(), but this call will have recorded the result
+   * (mResult) and returned early so that mRespondWithPromiseHolder can be
+   * settled first. mRespondWithPromiseHolder will be settled below, followed
+   * by a call to MaybeFinished() which settles mPromiseHolder.
+   *
+   * 2) If waitUntil() is called at least once, and respondWith() is not
+   * called, DispatchExtendableEventOnWorkerScope() will NOT have called
+   * FinishedWithResult(). We'll settle mRespondWithPromiseHolder first, and
+   * at some point in the future when the last waitUntil() promise settles,
+   * FinishedWithResult() will be called, settling mPromiseHolder.
+   *
+   * 3) If waitUntil() is not called, and respondWith() is called,
+   * DispatchExtendableEventOnWorkerScope() will NOT have called
+   * FinishedWithResult(). We can also guarantee that
+   * mRespondWithPromiseHolder will be settled before mPromiseHolder, due to
+   * the Promise::AppendNativeHandler() call ordering in
+   * FetchEvent::RespondWith().
+   *
+   * 4) If waitUntil() is called at least once, and respondWith() is also
+   * called, the effect is similar to scenario 3), with the most imporant
+   * property being mRespondWithPromiseHolder settling before mPromiseHolder.
+   *
+   * Note that if mPromiseHolder is settled before mRespondWithPromiseHolder,
+   * FetchEventOpChild will cancel the interception.
+   */
+  if (!fetchEvent->WaitToRespond()) {
+    MOZ_ASSERT(!mRespondWithPromiseHolder.IsEmpty());
+    MOZ_ASSERT(!aWorkerPrivate->UsesSystemPrincipal(),
+               "We don't support system-principal serviceworkers");
+
+    mFetchHandlerFinish = TimeStamp::Now();
+
+    if (fetchEvent->DefaultPrevented(CallerType::NonSystem)) {
+      // https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm
+      // Step 24.1.1: If eventHandled is not null, then reject eventHandled with
+      // a "NetworkError" DOMException in workerRealm.
+      mHandled->MaybeRejectWithNetworkError(
+          "FetchEvent.preventDefault() called"_ns);
+      mRespondWithPromiseHolder.Resolve(
+          FetchEventRespondWithResult(CancelInterceptionArgs(
+              NS_ERROR_INTERCEPTION_FAILED,
+              FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish))),
+          __func__);
+    } else {
+      // https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm
+      // Step 24.2: If eventHandled is not null, then resolve eventHandled.
+      mHandled->MaybeResolveWithUndefined();
+      mRespondWithPromiseHolder.Resolve(
+          FetchEventRespondWithResult(ResetInterceptionArgs(
+              FetchEventTimeStamps(mFetchHandlerStart, mFetchHandlerFinish))),
+          __func__);
+    }
+  } else {
+    MOZ_ASSERT(mRespondWithClosure);
+  }
+
+  mPostDispatchChecksDone = true;
+  MaybeFinished();
+
+  return NS_OK;
+}
+
+class ExtensionAPIEventOp final : public ServiceWorkerOp {
+  using ServiceWorkerOp::ServiceWorkerOp;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ExtensionAPIEventOp, override)
+
+ private:
+  ~ExtensionAPIEventOp() = default;
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
+    MOZ_ASSERT(aWorkerPrivate->ExtensionAPIAllowed());
+    MOZ_ASSERT(!mPromiseHolder.IsEmpty());
+
+    ServiceWorkerExtensionAPIEventOpArgs& args =
+        mArgs.get_ServiceWorkerExtensionAPIEventOpArgs();
+
+    ServiceWorkerExtensionAPIEventOpResult result;
+    result.extensionAPIEventListenerWasAdded() = false;
+
+    if (aWorkerPrivate->WorkerScriptExecutedSuccessfully()) {
+      GlobalObject globalObj(aCx, aWorkerPrivate->GlobalScope()->GetWrapper());
+      RefPtr<ServiceWorkerGlobalScope> scope;
+      UNWRAP_OBJECT(ServiceWorkerGlobalScope, globalObj.Get(), scope);
+      SafeRefPtr<extensions::ExtensionBrowser> extensionAPI =
+          scope->AcquireExtensionBrowser();
+      if (!extensionAPI) {
+        // If the worker script did never access the WebExtension APIs
+        // then we can return earlier, no event listener could have been added.
+        mPromiseHolder.Resolve(result, __func__);
+        return true;
+      }
+      // Check if a listener has been subscribed on the expected WebExtensions
+      // API event.
+      bool hasWakeupListener = extensionAPI->HasWakeupEventListener(
+          args.apiNamespace(), args.apiEventName());
+      result.extensionAPIEventListenerWasAdded() = hasWakeupListener;
+      mPromiseHolder.Resolve(result, __func__);
+    } else {
+      mPromiseHolder.Resolve(result, __func__);
+    }
+
+    return true;
+  }
+};
+
+/* static */ already_AddRefed<ServiceWorkerOp> ServiceWorkerOp::Create(
+    ServiceWorkerOpArgs&& aArgs,
+    std::function<void(const ServiceWorkerOpResult&)>&& aCallback) {
+  MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+
+  RefPtr<ServiceWorkerOp> op;
+
+  switch (aArgs.type()) {
+    case ServiceWorkerOpArgs::TServiceWorkerCheckScriptEvaluationOpArgs:
+      op = MakeRefPtr<CheckScriptEvaluationOp>(std::move(aArgs),
+                                               std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerUpdateStateOpArgs:
+      op = MakeRefPtr<UpdateServiceWorkerStateOp>(std::move(aArgs),
+                                                  std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerTerminateWorkerOpArgs:
+      op = MakeRefPtr<TerminateServiceWorkerOp>(std::move(aArgs),
+                                                std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerLifeCycleEventOpArgs:
+      op = MakeRefPtr<LifeCycleEventOp>(std::move(aArgs), std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerPushEventOpArgs:
+      op = MakeRefPtr<PushEventOp>(std::move(aArgs), std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerPushSubscriptionChangeEventOpArgs:
+      op = MakeRefPtr<PushSubscriptionChangeEventOp>(std::move(aArgs),
+                                                     std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerNotificationEventOpArgs:
+      op = MakeRefPtr<NotificationEventOp>(std::move(aArgs),
+                                           std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerMessageEventOpArgs:
+      op = MakeRefPtr<MessageEventOp>(std::move(aArgs), std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TParentToChildServiceWorkerFetchEventOpArgs:
+      op = MakeRefPtr<FetchEventOp>(std::move(aArgs), std::move(aCallback));
+      break;
+    case ServiceWorkerOpArgs::TServiceWorkerExtensionAPIEventOpArgs:
+      op = MakeRefPtr<ExtensionAPIEventOp>(std::move(aArgs),
+                                           std::move(aCallback));
+      break;
+    default:
+      MOZ_CRASH("Unknown Service Worker operation!");
+      return nullptr;
+  }
+
+  return op.forget();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerOp.h b/dom/serviceworkers/ServiceWorkerOp.h
new file mode 100644
index 0000000000..d485f6f210
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerOp.h
@@ -0,0 +1,199 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerop_h__
+#define mozilla_dom_serviceworkerop_h__
+
+#include <functional>
+
+#include "mozilla/dom/ServiceWorkerOpPromise.h"
+#include "nsISupportsImpl.h"
+
+#include "ServiceWorkerEvents.h"
+#include "ServiceWorkerOpPromise.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "mozilla/dom/RemoteWorkerChild.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+#include "mozilla/dom/WorkerRunnable.h"
+
+namespace mozilla::dom {
+
+class FetchEventOpProxyChild;
+
+class ServiceWorkerOp : public RemoteWorkerChild::Op {
+ public:
+  // `aCallback` will be called when the operation completes or is canceled.
+  static already_AddRefed<ServiceWorkerOp> Create(
+      ServiceWorkerOpArgs&& aArgs,
+      std::function<void(const ServiceWorkerOpResult&)>&& aCallback);
+
+  ServiceWorkerOp(
+      ServiceWorkerOpArgs&& aArgs,
+      std::function<void(const ServiceWorkerOpResult&)>&& aCallback);
+
+  ServiceWorkerOp(const ServiceWorkerOp&) = delete;
+
+  ServiceWorkerOp& operator=(const ServiceWorkerOp&) = delete;
+
+  ServiceWorkerOp(ServiceWorkerOp&&) = default;
+
+  ServiceWorkerOp& operator=(ServiceWorkerOp&&) = default;
+
+  // Returns `true` if the operation has started and `false` otherwise.
+  bool MaybeStart(RemoteWorkerChild* aOwner,
+                  RemoteWorkerChild::State& aState) final;
+
+  void StartOnMainThread(RefPtr<RemoteWorkerChild>& aOwner) final;
+
+  void Cancel() final;
+
+ protected:
+  ~ServiceWorkerOp();
+
+  bool Started() const;
+
+  bool IsTerminationOp() const;
+
+  // Override to provide a runnable that's not a `ServiceWorkerOpRunnable.`
+  virtual RefPtr<WorkerRunnable> GetRunnable(WorkerPrivate* aWorkerPrivate);
+
+  // Overridden by ServiceWorkerOp subclasses, it should return true when
+  // the ServiceWorkerOp was executed successfully (and false if it did fail).
+  // Content throwing an exception during event dispatch is still considered
+  // success.
+  virtual bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) = 0;
+
+  // Override to reject any additional MozPromises that subclasses may contain.
+  virtual void RejectAll(nsresult aStatus);
+
+  ServiceWorkerOpArgs mArgs;
+
+  // Subclasses must settle this promise when appropriate.
+  MozPromiseHolder<ServiceWorkerOpPromise> mPromiseHolder;
+
+ private:
+  class ServiceWorkerOpRunnable;
+
+  bool mStarted = false;
+};
+
+class ExtendableEventOp : public ServiceWorkerOp,
+                          public ExtendableEventCallback {
+  using ServiceWorkerOp::ServiceWorkerOp;
+
+ protected:
+  ~ExtendableEventOp() = default;
+
+  void FinishedWithResult(ExtendableEventResult aResult) override;
+};
+
+class FetchEventOp final : public ExtendableEventOp,
+                           public PromiseNativeHandler {
+  using ExtendableEventOp::ExtendableEventOp;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  /**
+   * This must be called once and only once before the first call to
+   * `MaybeStart()`; `aActor` will be used for `AsyncLog()` and
+   * `ReportCanceled().`
+   */
+  void SetActor(RefPtr<FetchEventOpProxyChild> aActor);
+
+  void RevokeActor(FetchEventOpProxyChild* aActor);
+
+  // This must be called at most once before the first call to `MaybeStart().`
+  RefPtr<FetchEventRespondWithPromise> GetRespondWithPromise();
+
+  // This must be called when `FetchEvent::RespondWith()` is called.
+  void RespondWithCalledAt(const nsCString& aRespondWithScriptSpec,
+                           uint32_t aRespondWithLineNumber,
+                           uint32_t aRespondWithColumnNumber);
+
+  void ReportCanceled(const nsCString& aPreventDefaultScriptSpec,
+                      uint32_t aPreventDefaultLineNumber,
+                      uint32_t aPreventDefaultColumnNumber);
+
+ private:
+  class AutoCancel;
+
+  ~FetchEventOp();
+
+  bool Exec(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override;
+
+  void RejectAll(nsresult aStatus) override;
+
+  void FinishedWithResult(ExtendableEventResult aResult) override;
+
+  /**
+   * `{Resolved,Reject}Callback()` are use to handle the
+   * `FetchEvent::RespondWith()` promise.
+   */
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  void MaybeFinished();
+
+  // Requires mRespondWithClosure to be non-empty.
+  void AsyncLog(const nsCString& aMessageName, nsTArray<nsString> aParams);
+
+  void AsyncLog(const nsCString& aScriptSpec, uint32_t aLineNumber,
+                uint32_t aColumnNumber, const nsCString& aMessageName,
+                nsTArray<nsString> aParams);
+
+  void GetRequestURL(nsAString& aOutRequestURL);
+
+  // A failure code means that the dispatch failed.
+  nsresult DispatchFetchEvent(JSContext* aCx, WorkerPrivate* aWorkerPrivate);
+
+  // Worker Launcher thread only. Used for `AsyncLog().`
+  RefPtr<FetchEventOpProxyChild> mActor;
+
+  /**
+   * Created on the Worker Launcher thread and settled on the worker thread.
+   * If this isn't settled before `mPromiseHolder` (which it should be),
+   * `FetchEventOpChild` will cancel the intercepted network request.
+   */
+  MozPromiseHolder<FetchEventRespondWithPromise> mRespondWithPromiseHolder;
+
+  // Worker thread only.
+  Maybe<ExtendableEventResult> mResult;
+  bool mPostDispatchChecksDone = false;
+
+  // Worker thread only; set when `FetchEvent::RespondWith()` is called.
+  Maybe<FetchEventRespondWithClosure> mRespondWithClosure;
+
+  // Must be set to `nullptr` on the worker thread because `Promise`'s
+  // destructor must be called on the worker thread.
+  RefPtr<Promise> mHandled;
+
+  // Must be set to `nullptr` on the worker thread because `Promise`'s
+  // destructor must be called on the worker thread.
+  RefPtr<Promise> mPreloadResponse;
+
+  // Holds the callback that resolves mPreloadResponse.
+  MozPromiseRequestHolder<FetchEventPreloadResponseAvailablePromise>
+      mPreloadResponseAvailablePromiseRequestHolder;
+  MozPromiseRequestHolder<FetchEventPreloadResponseTimingPromise>
+      mPreloadResponseTimingPromiseRequestHolder;
+  MozPromiseRequestHolder<FetchEventPreloadResponseEndPromise>
+      mPreloadResponseEndPromiseRequestHolder;
+
+  TimeStamp mFetchHandlerStart;
+  TimeStamp mFetchHandlerFinish;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerop_h__
diff --git a/dom/serviceworkers/ServiceWorkerOpArgs.ipdlh b/dom/serviceworkers/ServiceWorkerOpArgs.ipdlh
new file mode 100644
index 0000000000..302b677a2e
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerOpArgs.ipdlh
@@ -0,0 +1,191 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include ClientIPCTypes;
+include DOMTypes;
+include FetchTypes;
+
+include "mozilla/dom/ServiceWorkerIPCUtils.h";
+
+using mozilla::dom::ServiceWorkerState from "mozilla/dom/ServiceWorkerBinding.h";
+using mozilla::TimeStamp from "mozilla/TimeStamp.h";
+
+namespace mozilla {
+namespace dom {
+
+/**
+ * ServiceWorkerOpArgs
+ */
+struct ServiceWorkerCheckScriptEvaluationOpArgs {};
+
+struct ServiceWorkerUpdateStateOpArgs {
+  ServiceWorkerState state;
+};
+
+struct ServiceWorkerTerminateWorkerOpArgs {
+  uint32_t shutdownStateId;
+};
+
+struct ServiceWorkerLifeCycleEventOpArgs {
+  nsString eventName;
+};
+
+// Possibly need to differentiate an empty array from the absence of an array.
+union OptionalPushData {
+  void_t;
+  uint8_t[];
+};
+
+struct ServiceWorkerPushEventOpArgs {
+  nsString messageId;
+  OptionalPushData data;
+};
+
+struct ServiceWorkerPushSubscriptionChangeEventOpArgs {};
+
+struct ServiceWorkerNotificationEventOpArgs {
+  nsString eventName;
+  nsString id;
+  nsString title;
+  nsString dir;
+  nsString lang;
+  nsString body;
+  nsString tag;
+  nsString icon;
+  nsString data;
+  nsString behavior;
+  nsString scope;
+  uint32_t disableOpenClickDelay;
+};
+
+struct ServiceWorkerExtensionAPIEventOpArgs {
+  // WebExtensions API namespace and event names, for a list of the API namespaces
+  // and related API event names refer to the API JSONSchema files in-tree:
+  //
+  // https://searchfox.org/mozilla-central/search?q=&path=extensions%2Fschemas%2F*.json
+  nsString apiNamespace;
+  nsString apiEventName;
+};
+
+struct ServiceWorkerMessageEventOpArgs {
+  ClientInfoAndState clientInfoAndState;
+  ClonedOrErrorMessageData clonedData;
+};
+
+struct ServiceWorkerFetchEventOpArgsCommon {
+  nsCString workerScriptSpec;
+  IPCInternalRequest internalRequest;
+  nsString clientId;
+  nsString resultingClientId;
+  bool isNonSubresourceRequest;
+  // Is navigation preload enabled for this fetch? If true, if some
+  // preloadResponse was not already provided in this structure, then it's
+  // expected that a PreloadResponse message will eventually be sent.
+  bool preloadNavigation;
+  // Failure injection helper; non-NS_OK values indicate that the event, instead
+  // of dispatching should instead return a `CancelInterceptionArgs` response
+  // with this nsresult.  This value originates from
+  // `nsIServiceWorkerInfo::testingInjectCancellation`.
+  nsresult testingInjectCancellation;
+};
+
+struct ParentToParentServiceWorkerFetchEventOpArgs {
+  ServiceWorkerFetchEventOpArgsCommon common;
+  ParentToParentInternalResponse? preloadResponse;
+  ResponseTiming? preloadResponseTiming;
+  ResponseEndArgs? preloadResponseEndArgs;
+};
+
+struct ParentToChildServiceWorkerFetchEventOpArgs {
+  ServiceWorkerFetchEventOpArgsCommon common;
+  ParentToChildInternalResponse? preloadResponse;
+  ResponseTiming? preloadResponseTiming;
+  ResponseEndArgs? preloadResponseEndArgs;
+};
+
+union ServiceWorkerOpArgs {
+  ServiceWorkerCheckScriptEvaluationOpArgs;
+  ServiceWorkerUpdateStateOpArgs;
+  ServiceWorkerTerminateWorkerOpArgs;
+  ServiceWorkerLifeCycleEventOpArgs;
+  ServiceWorkerPushEventOpArgs;
+  ServiceWorkerPushSubscriptionChangeEventOpArgs;
+  ServiceWorkerNotificationEventOpArgs;
+  ServiceWorkerMessageEventOpArgs;
+  ServiceWorkerExtensionAPIEventOpArgs;
+  ParentToChildServiceWorkerFetchEventOpArgs;
+};
+
+/**
+ * IPCFetchEventRespondWithResult
+ */
+struct FetchEventRespondWithClosure {
+  nsCString respondWithScriptSpec;
+  uint32_t respondWithLineNumber;
+  uint32_t respondWithColumnNumber;
+};
+
+struct FetchEventTimeStamps {
+  TimeStamp fetchHandlerStart;
+  TimeStamp fetchHandlerFinish;
+};
+
+struct ChildToParentSynthesizeResponseArgs {
+  ChildToParentInternalResponse internalResponse;
+  FetchEventRespondWithClosure closure;
+  FetchEventTimeStamps timeStamps;
+};
+
+struct ParentToParentSynthesizeResponseArgs {
+  ParentToParentInternalResponse internalResponse;
+  FetchEventRespondWithClosure closure;
+  FetchEventTimeStamps timeStamps;
+};
+
+struct ResetInterceptionArgs {
+  FetchEventTimeStamps timeStamps;
+};
+
+struct CancelInterceptionArgs {
+  nsresult status;
+  FetchEventTimeStamps timeStamps;
+};
+
+union ChildToParentFetchEventRespondWithResult {
+  ChildToParentSynthesizeResponseArgs;
+  ResetInterceptionArgs;
+  CancelInterceptionArgs;
+};
+
+union ParentToParentFetchEventRespondWithResult {
+  ParentToParentSynthesizeResponseArgs;
+  ResetInterceptionArgs;
+  CancelInterceptionArgs;
+};
+
+/**
+ * ServiceWorkerOpResult
+ */
+struct ServiceWorkerCheckScriptEvaluationOpResult {
+  bool workerScriptExecutedSuccessfully;
+  bool fetchHandlerWasAdded;
+};
+
+struct ServiceWorkerFetchEventOpResult {
+  nsresult rv;
+};
+
+struct ServiceWorkerExtensionAPIEventOpResult {
+  bool extensionAPIEventListenerWasAdded;
+};
+
+union ServiceWorkerOpResult {
+  nsresult;
+  ServiceWorkerCheckScriptEvaluationOpResult;
+  ServiceWorkerFetchEventOpResult;
+  ServiceWorkerExtensionAPIEventOpResult;
+};
+
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/serviceworkers/ServiceWorkerOpPromise.h b/dom/serviceworkers/ServiceWorkerOpPromise.h
new file mode 100644
index 0000000000..cc73e9a2cb
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerOpPromise.h
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkeroppromise_h__
+#define mozilla_dom_serviceworkeroppromise_h__
+
+#include <utility>
+
+#include "mozilla/MozPromise.h"
+
+#include "mozilla/dom/SafeRefPtr.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+
+namespace mozilla::dom {
+
+class InternalResponse;
+
+using SynthesizeResponseArgs =
+    std::tuple<SafeRefPtr<InternalResponse>, FetchEventRespondWithClosure,
+               FetchEventTimeStamps>;
+
+using FetchEventRespondWithResult =
+    Variant<SynthesizeResponseArgs, ResetInterceptionArgs,
+            CancelInterceptionArgs>;
+
+using FetchEventRespondWithPromise =
+    MozPromise<FetchEventRespondWithResult, CancelInterceptionArgs, true>;
+
+// The reject type int is arbitrary, since this promise will never get rejected.
+// Unfortunately void is not supported as a reject type.
+using FetchEventPreloadResponseAvailablePromise =
+    MozPromise<SafeRefPtr<InternalResponse>, int, true>;
+
+using FetchEventPreloadResponseTimingPromise =
+    MozPromise<ResponseTiming, int, true>;
+
+using FetchEventPreloadResponseEndPromise =
+    MozPromise<ResponseEndArgs, int, true>;
+
+using ServiceWorkerOpPromise =
+    MozPromise<ServiceWorkerOpResult, nsresult, true>;
+
+using ServiceWorkerFetchEventOpPromise =
+    MozPromise<ServiceWorkerFetchEventOpResult, nsresult, true>;
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkeroppromise_h__
diff --git a/dom/serviceworkers/ServiceWorkerParent.cpp b/dom/serviceworkers/ServiceWorkerParent.cpp
new file mode 100644
index 0000000000..4e31344e92
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerParent.cpp
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerParent.h"
+
+#include "ServiceWorkerCloneData.h"
+#include "ServiceWorkerProxy.h"
+#include "mozilla/dom/ClientInfo.h"
+#include "mozilla/dom/ClientState.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+
+namespace mozilla::dom {
+
+using mozilla::dom::ipc::StructuredCloneData;
+using mozilla::ipc::IPCResult;
+
+void ServiceWorkerParent::ActorDestroy(ActorDestroyReason aReason) {
+  if (mProxy) {
+    mProxy->RevokeActor(this);
+    mProxy = nullptr;
+  }
+}
+
+IPCResult ServiceWorkerParent::RecvTeardown() {
+  MaybeSendDelete();
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerParent::RecvPostMessage(
+    const ClonedOrErrorMessageData& aClonedData,
+    const ClientInfoAndState& aSource) {
+  RefPtr<ServiceWorkerCloneData> data = new ServiceWorkerCloneData();
+  data->CopyFromClonedMessageData(aClonedData);
+
+  mProxy->PostMessage(std::move(data), ClientInfo(aSource.info()),
+                      ClientState::FromIPC(aSource.state()));
+
+  return IPC_OK();
+}
+
+ServiceWorkerParent::ServiceWorkerParent() : mDeleteSent(false) {}
+
+ServiceWorkerParent::~ServiceWorkerParent() { MOZ_DIAGNOSTIC_ASSERT(!mProxy); }
+
+void ServiceWorkerParent::Init(const IPCServiceWorkerDescriptor& aDescriptor) {
+  MOZ_DIAGNOSTIC_ASSERT(!mProxy);
+  mProxy = new ServiceWorkerProxy(ServiceWorkerDescriptor(aDescriptor));
+  mProxy->Init(this);
+}
+
+void ServiceWorkerParent::MaybeSendDelete() {
+  if (mDeleteSent) {
+    return;
+  }
+  mDeleteSent = true;
+  Unused << Send__delete__(this);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerParent.h b/dom/serviceworkers/ServiceWorkerParent.h
new file mode 100644
index 0000000000..7224c632c7
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerParent.h
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerparent_h__
+#define mozilla_dom_serviceworkerparent_h__
+
+#include "mozilla/dom/PServiceWorkerParent.h"
+
+namespace mozilla::dom {
+
+class IPCServiceWorkerDescriptor;
+class ServiceWorkerProxy;
+
+class ServiceWorkerParent final : public PServiceWorkerParent {
+  RefPtr<ServiceWorkerProxy> mProxy;
+  bool mDeleteSent;
+
+  ~ServiceWorkerParent();
+
+  // PServiceWorkerParent
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+  mozilla::ipc::IPCResult RecvTeardown() override;
+
+  mozilla::ipc::IPCResult RecvPostMessage(
+      const ClonedOrErrorMessageData& aClonedData,
+      const ClientInfoAndState& aSource) override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerParent, override);
+
+  ServiceWorkerParent();
+
+  void Init(const IPCServiceWorkerDescriptor& aDescriptor);
+
+  void MaybeSendDelete();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerparent_h__
diff --git a/dom/serviceworkers/ServiceWorkerPrivate.cpp b/dom/serviceworkers/ServiceWorkerPrivate.cpp
new file mode 100644
index 0000000000..864a598006
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerPrivate.cpp
@@ -0,0 +1,1752 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerPrivate.h"
+
+#include <utility>
+
+#include "MainThreadUtils.h"
+#include "ServiceWorkerCloneData.h"
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerRegistrationInfo.h"
+#include "ServiceWorkerUtils.h"
+#include "js/ErrorReport.h"
+#include "mozIThirdPartyUtil.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CycleCollectedJSContext.h"  // for MicroTaskRunnable
+#include "mozilla/ErrorResult.h"
+#include "mozilla/JSObjectHolder.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/OriginAttributes.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/RemoteLazyInputStreamStorage.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/FetchEventOpChild.h"
+#include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/InternalRequest.h"
+#include "mozilla/dom/ReferrerInfo.h"
+#include "mozilla/dom/RemoteType.h"
+#include "mozilla/dom/RemoteWorkerControllerChild.h"
+#include "mozilla/dom/RemoteWorkerManager.h"  // RemoteWorkerManager::GetRemoteType
+#include "mozilla/dom/ServiceWorkerBinding.h"
+#include "mozilla/extensions/WebExtensionPolicy.h"  // WebExtensionPolicy
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "mozilla/net/CookieJarSettings.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsICacheInfoChannel.h"
+#include "nsIChannel.h"
+#include "nsIHttpChannel.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIHttpHeaderVisitor.h"
+#include "nsINetworkInterceptController.h"
+#include "nsINamed.h"
+#include "nsIObserverService.h"
+#include "nsIRedirectHistoryEntry.h"
+#include "nsIScriptError.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsISupportsImpl.h"
+#include "nsIURI.h"
+#include "nsIUploadChannel2.h"
+#include "nsNetUtil.h"
+#include "nsProxyRelease.h"
+#include "nsQueryObject.h"
+#include "nsRFPService.h"
+#include "nsStreamUtils.h"
+#include "nsStringStream.h"
+#include "nsThreadUtils.h"
+
+#include "mozilla/dom/Client.h"
+#include "mozilla/dom/FetchUtil.h"
+#include "mozilla/dom/IndexedDatabaseManager.h"
+#include "mozilla/dom/NotificationEvent.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "mozilla/dom/PushEventBinding.h"
+#include "mozilla/dom/RequestBinding.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/WorkerDebugger.h"
+#include "mozilla/dom/WorkerRef.h"
+#include "mozilla/dom/WorkerRunnable.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/net/NeckoChannelParams.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "nsIReferrerInfo.h"
+
+extern mozilla::LazyLogModule sWorkerTelemetryLog;
+
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(_args) MOZ_LOG(sWorkerTelemetryLog, LogLevel::Debug, _args);
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+namespace mozilla::dom {
+
+uint32_t ServiceWorkerPrivate::sRunningServiceWorkers = 0;
+uint32_t ServiceWorkerPrivate::sRunningServiceWorkersFetch = 0;
+uint32_t ServiceWorkerPrivate::sRunningServiceWorkersMax = 0;
+uint32_t ServiceWorkerPrivate::sRunningServiceWorkersFetchMax = 0;
+
+// Tracks the "dom.serviceWorkers.disable_open_click_delay" preference. Modified
+// on main thread, read on worker threads.
+// It is updated every time a "notificationclick" event is dispatched. While
+// this is done without synchronization, at the worst, the thread will just get
+// an older value within which a popup is allowed to be displayed, which will
+// still be a valid value since it was set prior to dispatching the runnable.
+Atomic<uint32_t> gDOMDisableOpenClickDelay(0);
+
+/**
+ * KeepAliveToken
+ */
+KeepAliveToken::KeepAliveToken(ServiceWorkerPrivate* aPrivate)
+    : mPrivate(aPrivate) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrivate);
+  mPrivate->AddToken();
+}
+
+KeepAliveToken::~KeepAliveToken() {
+  MOZ_ASSERT(NS_IsMainThread());
+  mPrivate->ReleaseToken();
+}
+
+NS_IMPL_ISUPPORTS0(KeepAliveToken)
+
+/**
+ * RAIIActorPtrHolder
+ */
+ServiceWorkerPrivate::RAIIActorPtrHolder::RAIIActorPtrHolder(
+    already_AddRefed<RemoteWorkerControllerChild> aActor)
+    : mActor(aActor) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(mActor->Manager());
+}
+
+ServiceWorkerPrivate::RAIIActorPtrHolder::~RAIIActorPtrHolder() {
+  AssertIsOnMainThread();
+
+  mDestructorPromiseHolder.ResolveIfExists(true, __func__);
+
+  mActor->MaybeSendDelete();
+}
+
+RemoteWorkerControllerChild*
+ServiceWorkerPrivate::RAIIActorPtrHolder::operator->() const {
+  AssertIsOnMainThread();
+
+  return get();
+}
+
+RemoteWorkerControllerChild* ServiceWorkerPrivate::RAIIActorPtrHolder::get()
+    const {
+  AssertIsOnMainThread();
+
+  return mActor.get();
+}
+
+RefPtr<GenericPromise>
+ServiceWorkerPrivate::RAIIActorPtrHolder::OnDestructor() {
+  AssertIsOnMainThread();
+
+  return mDestructorPromiseHolder.Ensure(__func__);
+}
+
+/**
+ *  PendingFunctionEvent
+ */
+ServiceWorkerPrivate::PendingFunctionalEvent::PendingFunctionalEvent(
+    ServiceWorkerPrivate* aOwner,
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration)
+    : mOwner(aOwner), mRegistration(std::move(aRegistration)) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mOwner);
+  MOZ_ASSERT(mOwner->mInfo);
+  MOZ_ASSERT(mOwner->mInfo->State() == ServiceWorkerState::Activating);
+  MOZ_ASSERT(mRegistration);
+}
+
+ServiceWorkerPrivate::PendingFunctionalEvent::~PendingFunctionalEvent() {
+  AssertIsOnMainThread();
+}
+
+ServiceWorkerPrivate::PendingPushEvent::PendingPushEvent(
+    ServiceWorkerPrivate* aOwner,
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    ServiceWorkerPushEventOpArgs&& aArgs)
+    : PendingFunctionalEvent(aOwner, std::move(aRegistration)),
+      mArgs(std::move(aArgs)) {
+  AssertIsOnMainThread();
+}
+
+nsresult ServiceWorkerPrivate::PendingPushEvent::Send() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mOwner);
+  MOZ_ASSERT(mOwner->mInfo);
+
+  return mOwner->SendPushEventInternal(std::move(mRegistration),
+                                       std::move(mArgs));
+}
+
+ServiceWorkerPrivate::PendingFetchEvent::PendingFetchEvent(
+    ServiceWorkerPrivate* aOwner,
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel>&& aChannel,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises)
+    : PendingFunctionalEvent(aOwner, std::move(aRegistration)),
+      mArgs(std::move(aArgs)),
+      mChannel(std::move(aChannel)),
+      mPreloadResponseReadyPromises(std::move(aPreloadResponseReadyPromises)) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mChannel);
+}
+
+nsresult ServiceWorkerPrivate::PendingFetchEvent::Send() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mOwner);
+  MOZ_ASSERT(mOwner->mInfo);
+
+  return mOwner->SendFetchEventInternal(
+      std::move(mRegistration), std::move(mArgs), std::move(mChannel),
+      std::move(mPreloadResponseReadyPromises));
+}
+
+ServiceWorkerPrivate::PendingFetchEvent::~PendingFetchEvent() {
+  AssertIsOnMainThread();
+
+  if (NS_WARN_IF(mChannel)) {
+    mChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+  }
+}
+
+namespace {
+
+class HeaderFiller final : public nsIHttpHeaderVisitor {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit HeaderFiller(HeadersGuardEnum aGuard)
+      : mInternalHeaders(new InternalHeaders(aGuard)) {
+    MOZ_ASSERT(mInternalHeaders);
+  }
+
+  NS_IMETHOD
+  VisitHeader(const nsACString& aHeader, const nsACString& aValue) override {
+    ErrorResult result;
+    mInternalHeaders->Append(aHeader, aValue, result);
+
+    if (NS_WARN_IF(result.Failed())) {
+      return result.StealNSResult();
+    }
+
+    return NS_OK;
+  }
+
+  RefPtr<InternalHeaders> Extract() {
+    return RefPtr<InternalHeaders>(std::move(mInternalHeaders));
+  }
+
+ private:
+  ~HeaderFiller() = default;
+
+  RefPtr<InternalHeaders> mInternalHeaders;
+};
+
+NS_IMPL_ISUPPORTS(HeaderFiller, nsIHttpHeaderVisitor)
+
+Result<IPCInternalRequest, nsresult> GetIPCInternalRequest(
+    nsIInterceptedChannel* aChannel) {
+  AssertIsOnMainThread();
+
+  nsCOMPtr<nsIURI> uri;
+  MOZ_TRY(aChannel->GetSecureUpgradedChannelURI(getter_AddRefs(uri)));
+
+  nsCOMPtr<nsIURI> uriNoFragment;
+  MOZ_TRY(NS_GetURIWithoutRef(uri, getter_AddRefs(uriNoFragment)));
+
+  nsCOMPtr<nsIChannel> underlyingChannel;
+  MOZ_TRY(aChannel->GetChannel(getter_AddRefs(underlyingChannel)));
+
+  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(underlyingChannel);
+  MOZ_ASSERT(httpChannel, "How come we don't have an HTTP channel?");
+
+  nsCOMPtr<nsIHttpChannelInternal> internalChannel =
+      do_QueryInterface(httpChannel);
+  NS_ENSURE_TRUE(internalChannel, Err(NS_ERROR_NOT_AVAILABLE));
+
+  nsCOMPtr<nsICacheInfoChannel> cacheInfoChannel =
+      do_QueryInterface(underlyingChannel);
+
+  nsAutoCString spec;
+  MOZ_TRY(uriNoFragment->GetSpec(spec));
+
+  nsAutoCString fragment;
+  MOZ_TRY(uri->GetRef(fragment));
+
+  nsAutoCString method;
+  MOZ_TRY(httpChannel->GetRequestMethod(method));
+
+  // This is safe due to static_asserts in ServiceWorkerManager.cpp
+  uint32_t cacheModeInt;
+  MOZ_ALWAYS_SUCCEEDS(internalChannel->GetFetchCacheMode(&cacheModeInt));
+  RequestCache cacheMode = static_cast<RequestCache>(cacheModeInt);
+
+  RequestMode requestMode =
+      InternalRequest::MapChannelToRequestMode(underlyingChannel);
+
+  // This is safe due to static_asserts in ServiceWorkerManager.cpp
+  uint32_t redirectMode;
+  MOZ_ALWAYS_SUCCEEDS(internalChannel->GetRedirectMode(&redirectMode));
+  RequestRedirect requestRedirect = static_cast<RequestRedirect>(redirectMode);
+
+  RequestCredentials requestCredentials =
+      InternalRequest::MapChannelToRequestCredentials(underlyingChannel);
+
+  nsAutoString referrer;
+  ReferrerPolicy referrerPolicy = ReferrerPolicy::_empty;
+  ReferrerPolicy environmentReferrerPolicy = ReferrerPolicy::_empty;
+
+  nsCOMPtr<nsIReferrerInfo> referrerInfo = httpChannel->GetReferrerInfo();
+  if (referrerInfo) {
+    referrerPolicy = referrerInfo->ReferrerPolicy();
+    Unused << referrerInfo->GetComputedReferrerSpec(referrer);
+  }
+
+  uint32_t loadFlags;
+  MOZ_TRY(underlyingChannel->GetLoadFlags(&loadFlags));
+
+  nsCOMPtr<nsILoadInfo> loadInfo = underlyingChannel->LoadInfo();
+  nsContentPolicyType contentPolicyType = loadInfo->InternalContentPolicyType();
+
+  nsAutoString integrity;
+  MOZ_TRY(internalChannel->GetIntegrityMetadata(integrity));
+
+  RefPtr<HeaderFiller> headerFiller =
+      MakeRefPtr<HeaderFiller>(HeadersGuardEnum::Request);
+  MOZ_TRY(httpChannel->VisitNonDefaultRequestHeaders(headerFiller));
+
+  RefPtr<InternalHeaders> internalHeaders = headerFiller->Extract();
+
+  ErrorResult result;
+  internalHeaders->SetGuard(HeadersGuardEnum::Immutable, result);
+  if (NS_WARN_IF(result.Failed())) {
+    return Err(result.StealNSResult());
+  }
+
+  nsTArray<HeadersEntry> ipcHeaders;
+  HeadersGuardEnum ipcHeadersGuard;
+  internalHeaders->ToIPC(ipcHeaders, ipcHeadersGuard);
+
+  nsAutoCString alternativeDataType;
+  if (cacheInfoChannel &&
+      !cacheInfoChannel->PreferredAlternativeDataTypes().IsEmpty()) {
+    // TODO: the internal request probably needs all the preferred types.
+    alternativeDataType.Assign(
+        cacheInfoChannel->PreferredAlternativeDataTypes()[0].type());
+  }
+
+  Maybe<PrincipalInfo> principalInfo;
+  Maybe<PrincipalInfo> interceptionPrincipalInfo;
+  if (loadInfo->TriggeringPrincipal()) {
+    principalInfo.emplace();
+    interceptionPrincipalInfo.emplace();
+    MOZ_ALWAYS_SUCCEEDS(PrincipalToPrincipalInfo(
+        loadInfo->TriggeringPrincipal(), principalInfo.ptr()));
+    MOZ_ALWAYS_SUCCEEDS(PrincipalToPrincipalInfo(
+        loadInfo->TriggeringPrincipal(), interceptionPrincipalInfo.ptr()));
+  }
+
+  nsTArray<RedirectHistoryEntryInfo> redirectChain;
+  for (const nsCOMPtr<nsIRedirectHistoryEntry>& redirectEntry :
+       loadInfo->RedirectChain()) {
+    RedirectHistoryEntryInfo* entry = redirectChain.AppendElement();
+    MOZ_ALWAYS_SUCCEEDS(RHEntryToRHEntryInfo(redirectEntry, entry));
+  }
+
+  bool isThirdPartyChannel;
+  // ThirdPartyUtil* thirdPartyUtil = ThirdPartyUtil::GetInstance();
+  nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil =
+      do_GetService(THIRDPARTYUTIL_CONTRACTID);
+  if (thirdPartyUtil) {
+    nsCOMPtr<nsIURI> uri;
+    MOZ_TRY(underlyingChannel->GetURI(getter_AddRefs(uri)));
+    MOZ_TRY(thirdPartyUtil->IsThirdPartyChannel(underlyingChannel, uri,
+                                                &isThirdPartyChannel));
+  }
+
+  nsILoadInfo::CrossOriginEmbedderPolicy embedderPolicy =
+      loadInfo->GetLoadingEmbedderPolicy();
+
+  // Note: all the arguments are copied rather than moved, which would be more
+  // efficient, because there's no move-friendly constructor generated.
+  return IPCInternalRequest(
+      method, {spec}, ipcHeadersGuard, ipcHeaders, Nothing(), -1,
+      alternativeDataType, contentPolicyType, referrer, referrerPolicy,
+      environmentReferrerPolicy, requestMode, requestCredentials, cacheMode,
+      requestRedirect, integrity, fragment, principalInfo,
+      interceptionPrincipalInfo, contentPolicyType, redirectChain,
+      isThirdPartyChannel, embedderPolicy);
+}
+
+nsresult MaybeStoreStreamForBackgroundThread(nsIInterceptedChannel* aChannel,
+                                             IPCInternalRequest& aIPCRequest) {
+  nsCOMPtr<nsIChannel> channel;
+  MOZ_ALWAYS_SUCCEEDS(aChannel->GetChannel(getter_AddRefs(channel)));
+
+  Maybe<BodyStreamVariant> body;
+  nsCOMPtr<nsIUploadChannel2> uploadChannel = do_QueryInterface(channel);
+
+  if (uploadChannel) {
+    nsCOMPtr<nsIInputStream> uploadStream;
+    MOZ_TRY(uploadChannel->CloneUploadStream(&aIPCRequest.bodySize(),
+                                             getter_AddRefs(uploadStream)));
+
+    if (uploadStream) {
+      Maybe<BodyStreamVariant>& body = aIPCRequest.body();
+      body.emplace(ParentToParentStream());
+
+      MOZ_TRY(
+          nsID::GenerateUUIDInPlace(body->get_ParentToParentStream().uuid()));
+
+      auto storageOrErr = RemoteLazyInputStreamStorage::Get();
+      if (NS_WARN_IF(storageOrErr.isErr())) {
+        return storageOrErr.unwrapErr();
+      }
+
+      auto storage = storageOrErr.unwrap();
+      storage->AddStream(uploadStream, body->get_ParentToParentStream().uuid());
+    }
+  }
+
+  return NS_OK;
+}
+
+}  // anonymous namespace
+
+/**
+ * ServiceWorkerPrivate
+ */
+ServiceWorkerPrivate::ServiceWorkerPrivate(ServiceWorkerInfo* aInfo)
+    : mInfo(aInfo), mDebuggerCount(0), mTokenCount(0) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aInfo);
+  MOZ_ASSERT(!mControllerChild);
+
+  mIdleWorkerTimer = NS_NewTimer();
+  MOZ_ASSERT(mIdleWorkerTimer);
+
+  // Assert in all debug builds as well as non-debug Nightly and Dev Edition.
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(Initialize()));
+#else
+  MOZ_ALWAYS_SUCCEEDS(Initialize());
+#endif
+}
+
+ServiceWorkerPrivate::~ServiceWorkerPrivate() {
+  MOZ_ASSERT(!mTokenCount);
+  MOZ_ASSERT(!mInfo);
+  MOZ_ASSERT(!mControllerChild);
+  MOZ_ASSERT(mIdlePromiseHolder.IsEmpty());
+
+  mIdleWorkerTimer->Cancel();
+}
+
+nsresult ServiceWorkerPrivate::Initialize() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+
+  nsCOMPtr<nsIPrincipal> principal = mInfo->Principal();
+
+  nsCOMPtr<nsIURI> uri;
+  auto* basePrin = BasePrincipal::Cast(principal);
+  nsresult rv = basePrin->GetURI(getter_AddRefs(uri));
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (NS_WARN_IF(!uri)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  URIParams baseScriptURL;
+  SerializeURI(uri, baseScriptURL);
+
+  nsString id;
+  rv = mInfo->GetId(id);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  PrincipalInfo principalInfo;
+  rv = PrincipalToPrincipalInfo(principal, &principalInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+  if (NS_WARN_IF(!swm)) {
+    return NS_ERROR_DOM_ABORT_ERR;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> regInfo =
+      swm->GetRegistration(principal, mInfo->Scope());
+
+  if (NS_WARN_IF(!regInfo)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+      net::CookieJarSettings::Create(principal);
+  MOZ_ASSERT(cookieJarSettings);
+
+  // We can populate the partitionKey and the fingerprinting protection
+  // overrides using the originAttribute of the principal. If it has
+  // partitionKey set, It's a foreign partitioned principal and it implies that
+  // it's a third-party service worker. So, the cookieJarSettings can directly
+  // use the partitionKey from it. For first-party case, we can populate the
+  // partitionKey from the principal URI.
+  Maybe<uint64_t> overriddenFingerprintingSettingsArg;
+  Maybe<RFPTarget> overriddenFingerprintingSettings;
+  if (!principal->OriginAttributesRef().mPartitionKey.IsEmpty()) {
+    net::CookieJarSettings::Cast(cookieJarSettings)
+        ->SetPartitionKey(principal->OriginAttributesRef().mPartitionKey);
+
+    // The service worker is for a third-party context, we get first-party
+    // domain from the partitionKey and the third-party domain from the
+    // principal of the service worker. Then, we can get the fingerprinting
+    // protection overrides using them.
+    nsAutoString scheme;
+    nsAutoString pkBaseDomain;
+    int32_t unused;
+
+    if (OriginAttributes::ParsePartitionKey(
+            principal->OriginAttributesRef().mPartitionKey, scheme,
+            pkBaseDomain, unused)) {
+      nsCOMPtr<nsIURI> firstPartyURI;
+      rv = NS_NewURI(getter_AddRefs(firstPartyURI),
+                     scheme + u"://"_ns + pkBaseDomain);
+      if (NS_SUCCEEDED(rv)) {
+        overriddenFingerprintingSettings =
+            nsRFPService::GetOverriddenFingerprintingSettingsForURI(
+                firstPartyURI, uri);
+        if (overriddenFingerprintingSettings.isSome()) {
+          overriddenFingerprintingSettingsArg.emplace(
+              uint64_t(overriddenFingerprintingSettings.ref()));
+        }
+      }
+    }
+  } else if (!principal->OriginAttributesRef().mFirstPartyDomain.IsEmpty()) {
+    // Using the first party domain to know the context of the service worker.
+    // We will run into here if FirstPartyIsolation is enabled. In this case,
+    // the PartitionKey won't get populated.
+    nsCOMPtr<nsIURI> firstPartyURI;
+    // Because the service worker is only available in secure contexts, so we
+    // don't need to consider http and only use https as scheme to create
+    // the first-party URI
+    rv = NS_NewURI(
+        getter_AddRefs(firstPartyURI),
+        u"https://"_ns + principal->OriginAttributesRef().mFirstPartyDomain);
+    if (NS_SUCCEEDED(rv)) {
+      // If the first party domain is not a third-party domain, the service
+      // worker is running in first-party context.
+      bool isThirdParty;
+      rv = principal->IsThirdPartyURI(firstPartyURI, &isThirdParty);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      overriddenFingerprintingSettings =
+          isThirdParty
+              ? nsRFPService::GetOverriddenFingerprintingSettingsForURI(
+                    firstPartyURI, uri)
+              : nsRFPService::GetOverriddenFingerprintingSettingsForURI(
+                    uri, nullptr);
+
+      if (overriddenFingerprintingSettings.isSome()) {
+        overriddenFingerprintingSettingsArg.emplace(
+            uint64_t(overriddenFingerprintingSettings.ref()));
+      }
+    }
+  } else {
+    net::CookieJarSettings::Cast(cookieJarSettings)->SetPartitionKey(uri);
+
+    // The service worker is for a first-party context, we can use the uri of
+    // the service worker as the first-party domain to get the fingerprinting
+    // protection overrides.
+    overriddenFingerprintingSettings =
+        nsRFPService::GetOverriddenFingerprintingSettingsForURI(uri, nullptr);
+
+    if (overriddenFingerprintingSettings.isSome()) {
+      overriddenFingerprintingSettingsArg.emplace(
+          uint64_t(overriddenFingerprintingSettings.ref()));
+    }
+  }
+
+  net::CookieJarSettingsArgs cjsData;
+  net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(cjsData);
+
+  nsCOMPtr<nsIPrincipal> partitionedPrincipal;
+  rv = StoragePrincipalHelper::CreatePartitionedPrincipalForServiceWorker(
+      principal, cookieJarSettings, getter_AddRefs(partitionedPrincipal));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  PrincipalInfo partitionedPrincipalInfo;
+  rv =
+      PrincipalToPrincipalInfo(partitionedPrincipal, &partitionedPrincipalInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  StorageAccess storageAccess =
+      StorageAllowedForServiceWorker(principal, cookieJarSettings);
+
+  ServiceWorkerData serviceWorkerData;
+  serviceWorkerData.cacheName() = mInfo->CacheName();
+  serviceWorkerData.loadFlags() = static_cast<uint32_t>(
+      mInfo->GetImportsLoadFlags() | nsIChannel::LOAD_BYPASS_SERVICE_WORKER);
+  serviceWorkerData.id() = std::move(id);
+
+  nsAutoCString domain;
+  rv = uri->GetHost(domain);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  auto remoteType = RemoteWorkerManager::GetRemoteType(
+      principal, WorkerKind::WorkerKindService);
+  if (NS_WARN_IF(remoteType.isErr())) {
+    return remoteType.unwrapErr();
+  }
+
+  // Determine if the service worker is registered under a third-party context
+  // by checking if it's running under a partitioned principal.
+  bool isThirdPartyContextToTopWindow =
+      !principal->OriginAttributesRef().mPartitionKey.IsEmpty();
+
+  mRemoteWorkerData = RemoteWorkerData(
+      NS_ConvertUTF8toUTF16(mInfo->ScriptSpec()), baseScriptURL, baseScriptURL,
+      /* name */ VoidString(),
+      /* workerType */ WorkerType::Classic,
+      /* credentials */ RequestCredentials::Omit,
+      /* loading principal */ principalInfo, principalInfo,
+      partitionedPrincipalInfo,
+      /* useRegularPrincipal */ true,
+
+      // ServiceWorkers run as first-party, no storage-access permission needed.
+      /* usingStorageAccess */ false,
+
+      cjsData, domain,
+      /* isSecureContext */ true,
+      /* clientInfo*/ Nothing(),
+
+      // The RemoteWorkerData CTOR doesn't allow to set the referrerInfo via
+      // already_AddRefed<>. Let's set it to null.
+      /* referrerInfo */ nullptr,
+
+      storageAccess, isThirdPartyContextToTopWindow,
+      nsContentUtils::ShouldResistFingerprinting_dangerous(
+          principal,
+          "Service Workers exist outside a Document or Channel; as a property "
+          "of the domain (and origin attributes). We don't have a "
+          "CookieJarSettings to perform the nested check, but we can rely on"
+          "the FPI/dFPI partition key check. The WorkerPrivate's "
+          "ShouldResistFingerprinting function for the ServiceWorker depends "
+          "on this boolean and will also consider an explicit RFPTarget.",
+          RFPTarget::IsAlwaysEnabledForPrecompute),
+      overriddenFingerprintingSettingsArg,
+      // Origin trials are associated to a window, so it doesn't make sense on
+      // service workers.
+      OriginTrials(), std::move(serviceWorkerData), regInfo->AgentClusterId(),
+      remoteType.unwrap());
+
+  mRemoteWorkerData.referrerInfo() = MakeAndAddRef<ReferrerInfo>();
+
+  // This fills in the rest of mRemoteWorkerData.serviceWorkerData().
+  RefreshRemoteWorkerData(regInfo);
+
+  return NS_OK;
+}
+
+nsresult ServiceWorkerPrivate::CheckScriptEvaluation(
+    RefPtr<LifeCycleEventCallback> aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aCallback);
+
+  RefPtr<ServiceWorkerPrivate> self = this;
+
+  /**
+   * We need to capture the actor associated with the current Service Worker so
+   * we can terminate it if script evaluation failed.
+   */
+  nsresult rv = SpawnWorkerIfNeeded();
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aCallback->SetResult(false);
+    aCallback->Run();
+
+    return rv;
+  }
+
+  MOZ_ASSERT(mControllerChild);
+
+  RefPtr<RAIIActorPtrHolder> holder = mControllerChild;
+
+  return ExecServiceWorkerOp(
+      ServiceWorkerCheckScriptEvaluationOpArgs(),
+      [self = std::move(self), holder = std::move(holder),
+       callback = aCallback](ServiceWorkerOpResult&& aResult) mutable {
+        if (aResult.type() == ServiceWorkerOpResult::
+                                  TServiceWorkerCheckScriptEvaluationOpResult) {
+          auto& result =
+              aResult.get_ServiceWorkerCheckScriptEvaluationOpResult();
+
+          if (result.workerScriptExecutedSuccessfully()) {
+            self->SetHandlesFetch(result.fetchHandlerWasAdded());
+            if (self->mHandlesFetch == Unknown) {
+              self->mHandlesFetch =
+                  result.fetchHandlerWasAdded() ? Enabled : Disabled;
+              // Update telemetry for # of running SW - the already-running SW
+              // handles fetch
+              if (self->mHandlesFetch == Enabled) {
+                self->UpdateRunning(0, 1);
+              }
+            }
+
+            callback->SetResult(result.workerScriptExecutedSuccessfully());
+            callback->Run();
+            return;
+          }
+        }
+
+        /**
+         * If script evaluation failed, first terminate the Service Worker
+         * before invoking the callback.
+         */
+        MOZ_ASSERT_IF(aResult.type() == ServiceWorkerOpResult::Tnsresult,
+                      NS_FAILED(aResult.get_nsresult()));
+
+        // If a termination operation was already issued using `holder`...
+        if (self->mControllerChild != holder) {
+          holder->OnDestructor()->Then(
+              GetCurrentSerialEventTarget(), __func__,
+              [callback = std::move(callback)](
+                  const GenericPromise::ResolveOrRejectValue&) {
+                callback->SetResult(false);
+                callback->Run();
+              });
+
+          return;
+        }
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        MOZ_ASSERT(swm);
+
+        auto shutdownStateId = swm->MaybeInitServiceWorkerShutdownProgress();
+
+        RefPtr<GenericNonExclusivePromise> promise =
+            self->ShutdownInternal(shutdownStateId);
+
+        swm->BlockShutdownOn(promise, shutdownStateId);
+
+        promise->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [callback = std::move(callback)](
+                const GenericNonExclusivePromise::ResolveOrRejectValue&) {
+              callback->SetResult(false);
+              callback->Run();
+            });
+      },
+      [callback = aCallback] {
+        callback->SetResult(false);
+        callback->Run();
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendMessageEvent(
+    RefPtr<ServiceWorkerCloneData>&& aData,
+    const ClientInfoAndState& aClientInfoAndState) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aData);
+
+  auto scopeExit = MakeScopeExit([&] { Shutdown(); });
+
+  PBackgroundChild* bgChild = BackgroundChild::GetForCurrentThread();
+
+  if (NS_WARN_IF(!bgChild)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  ServiceWorkerMessageEventOpArgs args;
+  args.clientInfoAndState() = aClientInfoAndState;
+  if (!aData->BuildClonedMessageData(args.clonedData())) {
+    return NS_ERROR_DOM_DATA_CLONE_ERR;
+  }
+
+  scopeExit.release();
+
+  return ExecServiceWorkerOp(
+      std::move(args), [](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendLifeCycleEvent(
+    const nsAString& aEventType, RefPtr<LifeCycleEventCallback> aCallback) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aCallback);
+
+  return ExecServiceWorkerOp(
+      ServiceWorkerLifeCycleEventOpArgs(nsString(aEventType)),
+      [callback = aCallback](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+
+        callback->SetResult(NS_SUCCEEDED(aResult.get_nsresult()));
+        callback->Run();
+      },
+      [callback = aCallback] {
+        callback->SetResult(false);
+        callback->Run();
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendPushEvent(
+    const nsAString& aMessageId, const Maybe<nsTArray<uint8_t>>& aData,
+    RefPtr<ServiceWorkerRegistrationInfo> aRegistration) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+  MOZ_ASSERT(aRegistration);
+
+  ServiceWorkerPushEventOpArgs args;
+  args.messageId() = nsString(aMessageId);
+
+  if (aData) {
+    args.data() = aData.ref();
+  } else {
+    args.data() = void_t();
+  }
+
+  if (mInfo->State() == ServiceWorkerState::Activating) {
+    UniquePtr<PendingFunctionalEvent> pendingEvent =
+        MakeUnique<PendingPushEvent>(this, std::move(aRegistration),
+                                     std::move(args));
+
+    mPendingFunctionalEvents.AppendElement(std::move(pendingEvent));
+
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(mInfo->State() == ServiceWorkerState::Activated);
+
+  return SendPushEventInternal(std::move(aRegistration), std::move(args));
+}
+
+nsresult ServiceWorkerPrivate::SendPushEventInternal(
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    ServiceWorkerPushEventOpArgs&& aArgs) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aRegistration);
+
+  return ExecServiceWorkerOp(
+      std::move(aArgs),
+      [registration = aRegistration](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+
+        registration->MaybeScheduleTimeCheckAndUpdate();
+      },
+      [registration = aRegistration]() {
+        registration->MaybeScheduleTimeCheckAndUpdate();
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendPushSubscriptionChangeEvent() {
+  AssertIsOnMainThread();
+
+  return ExecServiceWorkerOp(
+      ServiceWorkerPushSubscriptionChangeEventOpArgs(),
+      [](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendNotificationEvent(
+    const nsAString& aEventName, const nsAString& aID, const nsAString& aTitle,
+    const nsAString& aDir, const nsAString& aLang, const nsAString& aBody,
+    const nsAString& aTag, const nsAString& aIcon, const nsAString& aData,
+    const nsAString& aBehavior, const nsAString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (aEventName.EqualsLiteral(NOTIFICATION_CLICK_EVENT_NAME)) {
+    gDOMDisableOpenClickDelay =
+        Preferences::GetInt("dom.serviceWorkers.disable_open_click_delay");
+  } else if (!aEventName.EqualsLiteral(NOTIFICATION_CLOSE_EVENT_NAME)) {
+    MOZ_ASSERT_UNREACHABLE("Invalid notification event name");
+    return NS_ERROR_FAILURE;
+  }
+
+  ServiceWorkerNotificationEventOpArgs args;
+  args.eventName() = nsString(aEventName);
+  args.id() = nsString(aID);
+  args.title() = nsString(aTitle);
+  args.dir() = nsString(aDir);
+  args.lang() = nsString(aLang);
+  args.body() = nsString(aBody);
+  args.tag() = nsString(aTag);
+  args.icon() = nsString(aIcon);
+  args.data() = nsString(aData);
+  args.behavior() = nsString(aBehavior);
+  args.scope() = nsString(aScope);
+  args.disableOpenClickDelay() = gDOMDisableOpenClickDelay;
+
+  return ExecServiceWorkerOp(
+      std::move(args), [](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+      });
+}
+
+nsresult ServiceWorkerPrivate::SendFetchEvent(
+    nsCOMPtr<nsIInterceptedChannel> aChannel, nsILoadGroup* aLoadGroup,
+    const nsAString& aClientId, const nsAString& aResultingClientId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aChannel);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (NS_WARN_IF(!mInfo || !swm)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIChannel> channel;
+  nsresult rv = aChannel->GetChannel(getter_AddRefs(channel));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool isNonSubresourceRequest =
+      nsContentUtils::IsNonSubresourceRequest(channel);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration;
+  if (isNonSubresourceRequest) {
+    registration = swm->GetRegistration(mInfo->Principal(), mInfo->Scope());
+  } else {
+    nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo();
+
+    // We'll check for a null registration below rather than an error code here.
+    Unused << swm->GetClientRegistration(loadInfo->GetClientInfo().ref(),
+                                         getter_AddRefs(registration));
+  }
+
+  // Its possible the registration is removed between starting the interception
+  // and actually dispatching the fetch event.  In these cases we simply
+  // want to restart the original network request.  Since this is a normal
+  // condition we handle the reset here instead of returning an error which
+  // would in turn trigger a console report.
+  if (!registration) {
+    nsresult rv = aChannel->ResetInterception(false);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Failed to resume intercepted network request");
+      aChannel->CancelInterception(rv);
+    }
+    return NS_OK;
+  }
+
+  // Handle Fetch algorithm - step 16. If the service worker didn't register
+  // any fetch event handlers, then abort the interception and maybe trigger
+  // the soft update algorithm.
+  if (!mInfo->HandlesFetch()) {
+    nsresult rv = aChannel->ResetInterception(false);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Failed to resume intercepted network request");
+      aChannel->CancelInterception(rv);
+    }
+
+    // Trigger soft updates if necessary.
+    registration->MaybeScheduleTimeCheckAndUpdate();
+
+    return NS_OK;
+  }
+
+  auto scopeExit = MakeScopeExit([&] {
+    aChannel->CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+    Shutdown();
+  });
+
+  IPCInternalRequest request;
+  MOZ_TRY_VAR(request, GetIPCInternalRequest(aChannel));
+
+  scopeExit.release();
+
+  bool preloadNavigation = isNonSubresourceRequest &&
+                           request.method().LowerCaseEqualsASCII("get") &&
+                           registration->GetNavigationPreloadState().enabled();
+
+  RefPtr<FetchServicePromises> preloadResponsePromises;
+  if (preloadNavigation) {
+    preloadResponsePromises = SetupNavigationPreload(aChannel, registration);
+  }
+
+  ParentToParentServiceWorkerFetchEventOpArgs args(
+      ServiceWorkerFetchEventOpArgsCommon(
+          mInfo->ScriptSpec(), request, nsString(aClientId),
+          nsString(aResultingClientId), isNonSubresourceRequest,
+          preloadNavigation, mInfo->TestingInjectCancellation()),
+      Nothing(), Nothing(), Nothing());
+
+  if (mInfo->State() == ServiceWorkerState::Activating) {
+    UniquePtr<PendingFunctionalEvent> pendingEvent =
+        MakeUnique<PendingFetchEvent>(this, std::move(registration),
+                                      std::move(args), std::move(aChannel),
+                                      std::move(preloadResponsePromises));
+
+    mPendingFunctionalEvents.AppendElement(std::move(pendingEvent));
+
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(mInfo->State() == ServiceWorkerState::Activated);
+
+  return SendFetchEventInternal(std::move(registration), std::move(args),
+                                std::move(aChannel),
+                                std::move(preloadResponsePromises));
+}
+
+nsresult ServiceWorkerPrivate::SendFetchEventInternal(
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel>&& aChannel,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises) {
+  AssertIsOnMainThread();
+
+  auto scopeExit = MakeScopeExit([&] { Shutdown(); });
+
+  if (NS_WARN_IF(!mInfo)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  MOZ_TRY(SpawnWorkerIfNeeded());
+  MOZ_TRY(MaybeStoreStreamForBackgroundThread(
+      aChannel, aArgs.common().internalRequest()));
+
+  scopeExit.release();
+
+  MOZ_ASSERT(mControllerChild);
+
+  RefPtr<RAIIActorPtrHolder> holder = mControllerChild;
+
+  FetchEventOpChild::SendFetchEvent(
+      mControllerChild->get(), std::move(aArgs), std::move(aChannel),
+      std::move(aRegistration), std::move(aPreloadResponseReadyPromises),
+      CreateEventKeepAliveToken())
+      ->Then(GetCurrentSerialEventTarget(), __func__,
+             [holder = std::move(holder)](
+                 const GenericPromise::ResolveOrRejectValue& aResult) {
+               Unused << NS_WARN_IF(aResult.IsReject());
+             });
+
+  return NS_OK;
+}
+
+Result<RefPtr<ServiceWorkerPrivate::PromiseExtensionWorkerHasListener>,
+       nsresult>
+ServiceWorkerPrivate::WakeForExtensionAPIEvent(
+    const nsAString& aExtensionAPINamespace,
+    const nsAString& aExtensionAPIEventName) {
+  AssertIsOnMainThread();
+
+  ServiceWorkerExtensionAPIEventOpArgs args;
+  args.apiNamespace() = nsString(aExtensionAPINamespace);
+  args.apiEventName() = nsString(aExtensionAPIEventName);
+
+  auto promise =
+      MakeRefPtr<PromiseExtensionWorkerHasListener::Private>(__func__);
+
+  nsresult rv = ExecServiceWorkerOp(
+      std::move(args),
+      [promise](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(
+            aResult.type() ==
+            ServiceWorkerOpResult::TServiceWorkerExtensionAPIEventOpResult);
+        auto& result = aResult.get_ServiceWorkerExtensionAPIEventOpResult();
+        promise->Resolve(result.extensionAPIEventListenerWasAdded(), __func__);
+      },
+      [promise]() { promise->Reject(NS_ERROR_FAILURE, __func__); });
+
+  if (NS_FAILED(rv)) {
+    promise->Reject(rv, __func__);
+  }
+
+  RefPtr<PromiseExtensionWorkerHasListener> outPromise(promise);
+  return outPromise;
+}
+
+nsresult ServiceWorkerPrivate::SpawnWorkerIfNeeded() {
+  AssertIsOnMainThread();
+
+  if (mControllerChild) {
+    RenewKeepAliveToken();
+    return NS_OK;
+  }
+
+  if (!mInfo) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  mServiceWorkerLaunchTimeStart = TimeStamp::Now();
+
+  PBackgroundChild* bgChild = BackgroundChild::GetForCurrentThread();
+
+  if (NS_WARN_IF(!bgChild)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  // If the worker principal is an extension principal, then we should not spawn
+  // a worker if there is no WebExtensionPolicy associated to that principal
+  // or if the WebExtensionPolicy is not active.
+  auto* principal = mInfo->Principal();
+  if (principal->SchemeIs("moz-extension")) {
+    auto* addonPolicy = BasePrincipal::Cast(principal)->AddonPolicy();
+    if (!addonPolicy || !addonPolicy->Active()) {
+      NS_WARNING(
+          "Trying to wake up a service worker for a disabled webextension.");
+      return NS_ERROR_DOM_INVALID_STATE_ERR;
+    }
+  }
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+  if (NS_WARN_IF(!swm)) {
+    return NS_ERROR_DOM_ABORT_ERR;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> regInfo =
+      swm->GetRegistration(principal, mInfo->Scope());
+
+  if (NS_WARN_IF(!regInfo)) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  RefreshRemoteWorkerData(regInfo);
+
+  RefPtr<RemoteWorkerControllerChild> controllerChild =
+      new RemoteWorkerControllerChild(this);
+
+  if (NS_WARN_IF(!bgChild->SendPRemoteWorkerControllerConstructor(
+          controllerChild, mRemoteWorkerData))) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  mControllerChild = new RAIIActorPtrHolder(controllerChild.forget());
+
+  // Update Running count here because we may Terminate before we get
+  // CreationSucceeded().  We'll update if it handles Fetch if that changes
+  // (
+  UpdateRunning(1, mHandlesFetch == Enabled ? 1 : 0);
+
+  return NS_OK;
+}
+
+void ServiceWorkerPrivate::TerminateWorker() {
+  MOZ_ASSERT(NS_IsMainThread());
+  mIdleWorkerTimer->Cancel();
+  mIdleKeepAliveToken = nullptr;
+  Shutdown();
+}
+
+void ServiceWorkerPrivate::NoteDeadServiceWorkerInfo() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  TerminateWorker();
+  mInfo = nullptr;
+}
+
+void ServiceWorkerPrivate::UpdateState(ServiceWorkerState aState) {
+  AssertIsOnMainThread();
+
+  if (!mControllerChild) {
+    return;
+  }
+
+  nsresult rv = ExecServiceWorkerOp(
+      ServiceWorkerUpdateStateOpArgs(aState),
+      [](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+      });
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Shutdown();
+    return;
+  }
+
+  if (aState != ServiceWorkerState::Activated) {
+    return;
+  }
+
+  for (auto& event : mPendingFunctionalEvents) {
+    Unused << NS_WARN_IF(NS_FAILED(event->Send()));
+  }
+
+  mPendingFunctionalEvents.Clear();
+}
+
+nsresult ServiceWorkerPrivate::GetDebugger(nsIWorkerDebugger** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aResult);
+
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult ServiceWorkerPrivate::AttachDebugger() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // When the first debugger attaches to a worker, we spawn a worker if needed,
+  // and cancel the idle timeout. The idle timeout should not be reset until
+  // the last debugger detached from the worker.
+  if (!mDebuggerCount) {
+    nsresult rv = SpawnWorkerIfNeeded();
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    /**
+     * Renewing the idle KeepAliveToken for spawning workers happens
+     * asynchronously, rather than synchronously.
+     * The asynchronous renewal is because the actual spawning of workers occurs
+     * in a content process, so we will only renew once notified that the worker
+     * has been successfully created
+     *
+     * This means that the DevTools way of starting up a worker by calling
+     * `AttachDebugger` immediately followed by `DetachDebugger` will spawn and
+     * immediately terminate a worker (because `mTokenCount` is possibly 0
+     * due to the idle KeepAliveToken being created asynchronously). So, just
+     * renew the KeepAliveToken right now.
+     */
+    RenewKeepAliveToken();
+    mIdleWorkerTimer->Cancel();
+  }
+
+  ++mDebuggerCount;
+
+  return NS_OK;
+}
+
+nsresult ServiceWorkerPrivate::DetachDebugger() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mDebuggerCount) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  --mDebuggerCount;
+
+  // When the last debugger detaches from a worker, we either reset the idle
+  // timeout, or terminate the worker if there are no more active tokens.
+  if (!mDebuggerCount) {
+    if (mTokenCount) {
+      ResetIdleTimeout();
+    } else {
+      TerminateWorker();
+    }
+  }
+
+  return NS_OK;
+}
+
+bool ServiceWorkerPrivate::IsIdle() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mTokenCount == 0 || (mTokenCount == 1 && mIdleKeepAliveToken);
+}
+
+RefPtr<GenericPromise> ServiceWorkerPrivate::GetIdlePromise() {
+#ifdef DEBUG
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!IsIdle());
+  MOZ_ASSERT(!mIdlePromiseObtained, "Idle promise may only be obtained once!");
+  mIdlePromiseObtained = true;
+#endif
+
+  return mIdlePromiseHolder.Ensure(__func__);
+}
+
+namespace {
+
+class ServiceWorkerPrivateTimerCallback final : public nsITimerCallback,
+                                                public nsINamed {
+ public:
+  using Method = void (ServiceWorkerPrivate::*)(nsITimer*);
+
+  ServiceWorkerPrivateTimerCallback(ServiceWorkerPrivate* aServiceWorkerPrivate,
+                                    Method aMethod)
+      : mServiceWorkerPrivate(aServiceWorkerPrivate), mMethod(aMethod) {}
+
+  NS_IMETHOD
+  Notify(nsITimer* aTimer) override {
+    (mServiceWorkerPrivate->*mMethod)(aTimer);
+    mServiceWorkerPrivate = nullptr;
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetName(nsACString& aName) override {
+    aName.AssignLiteral("ServiceWorkerPrivateTimerCallback");
+    return NS_OK;
+  }
+
+ private:
+  ~ServiceWorkerPrivateTimerCallback() = default;
+
+  RefPtr<ServiceWorkerPrivate> mServiceWorkerPrivate;
+  Method mMethod;
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+};
+
+NS_IMPL_ISUPPORTS(ServiceWorkerPrivateTimerCallback, nsITimerCallback,
+                  nsINamed);
+
+}  // anonymous namespace
+
+void ServiceWorkerPrivate::NoteIdleWorkerCallback(nsITimer* aTimer) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(aTimer == mIdleWorkerTimer, "Invalid timer!");
+
+  // Release ServiceWorkerPrivate's token, since the grace period has ended.
+  mIdleKeepAliveToken = nullptr;
+
+  if (mControllerChild) {
+    // If we still have a living worker at this point it means that either there
+    // are pending waitUntil promises or the worker is doing some long-running
+    // computation. Wait a bit more until we forcibly terminate the worker.
+    uint32_t timeout =
+        Preferences::GetInt("dom.serviceWorkers.idle_extended_timeout");
+    nsCOMPtr<nsITimerCallback> cb = new ServiceWorkerPrivateTimerCallback(
+        this, &ServiceWorkerPrivate::TerminateWorkerCallback);
+    DebugOnly<nsresult> rv = mIdleWorkerTimer->InitWithCallback(
+        cb, timeout, nsITimer::TYPE_ONE_SHOT);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+}
+
+void ServiceWorkerPrivate::TerminateWorkerCallback(nsITimer* aTimer) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(aTimer == this->mIdleWorkerTimer, "Invalid timer!");
+
+  // mInfo must be non-null at this point because NoteDeadServiceWorkerInfo
+  // which zeroes it calls TerminateWorker which cancels our timer which will
+  // ensure we don't get invoked even if the nsTimerEvent is in the event queue.
+  ServiceWorkerManager::LocalizeAndReportToAllClients(
+      mInfo->Scope(), "ServiceWorkerGraceTimeoutTermination",
+      nsTArray<nsString>{NS_ConvertUTF8toUTF16(mInfo->Scope())});
+
+  TerminateWorker();
+}
+
+void ServiceWorkerPrivate::RenewKeepAliveToken() {
+  // We should have an active worker if we're renewing the keep alive token.
+  MOZ_ASSERT(mControllerChild);
+
+  // If there is at least one debugger attached to the worker, the idle worker
+  // timeout was canceled when the first debugger attached to the worker. It
+  // should not be reset until the last debugger detaches from the worker.
+  if (!mDebuggerCount) {
+    ResetIdleTimeout();
+  }
+
+  if (!mIdleKeepAliveToken) {
+    mIdleKeepAliveToken = new KeepAliveToken(this);
+  }
+}
+
+void ServiceWorkerPrivate::ResetIdleTimeout() {
+  uint32_t timeout = Preferences::GetInt("dom.serviceWorkers.idle_timeout");
+  nsCOMPtr<nsITimerCallback> cb = new ServiceWorkerPrivateTimerCallback(
+      this, &ServiceWorkerPrivate::NoteIdleWorkerCallback);
+  DebugOnly<nsresult> rv =
+      mIdleWorkerTimer->InitWithCallback(cb, timeout, nsITimer::TYPE_ONE_SHOT);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+void ServiceWorkerPrivate::AddToken() {
+  MOZ_ASSERT(NS_IsMainThread());
+  ++mTokenCount;
+}
+
+void ServiceWorkerPrivate::ReleaseToken() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(mTokenCount > 0);
+  --mTokenCount;
+
+  if (IsIdle()) {
+    mIdlePromiseHolder.ResolveIfExists(true, __func__);
+
+    if (!mTokenCount) {
+      TerminateWorker();
+    }
+
+    // mInfo can be nullptr here if NoteDeadServiceWorkerInfo() is called while
+    // the KeepAliveToken is being proxy released as a runnable.
+    else if (mInfo) {
+      RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+      if (swm) {
+        swm->WorkerIsIdle(mInfo);
+      }
+    }
+  }
+}
+
+already_AddRefed<KeepAliveToken>
+ServiceWorkerPrivate::CreateEventKeepAliveToken() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // When the WorkerPrivate is in a separate process, we first hold a normal
+  // KeepAliveToken. Then, after we're notified that the worker is alive, we
+  // create the idle KeepAliveToken.
+  MOZ_ASSERT(mIdleKeepAliveToken || mControllerChild);
+
+  RefPtr<KeepAliveToken> ref = new KeepAliveToken(this);
+  return ref.forget();
+}
+
+void ServiceWorkerPrivate::SetHandlesFetch(bool aValue) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (NS_WARN_IF(!mInfo)) {
+    return;
+  }
+
+  mInfo->SetHandlesFetch(aValue);
+}
+
+RefPtr<GenericPromise> ServiceWorkerPrivate::SetSkipWaitingFlag() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+  if (!swm) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> regInfo =
+      swm->GetRegistration(mInfo->Principal(), mInfo->Scope());
+
+  if (!regInfo) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  mInfo->SetSkipWaitingFlag();
+
+  RefPtr<GenericPromise::Private> promise =
+      new GenericPromise::Private(__func__);
+
+  regInfo->TryToActivateAsync([promise] { promise->Resolve(true, __func__); });
+
+  return promise;
+}
+
+/* static */
+void ServiceWorkerPrivate::UpdateRunning(int32_t aDelta, int32_t aFetchDelta) {
+  // Record values for time we were running at the current values
+  RefPtr<ServiceWorkerManager> manager(ServiceWorkerManager::GetInstance());
+  manager->RecordTelemetry(sRunningServiceWorkers, sRunningServiceWorkersFetch);
+
+  MOZ_ASSERT(((int64_t)sRunningServiceWorkers) + aDelta >= 0);
+  sRunningServiceWorkers += aDelta;
+  if (sRunningServiceWorkers > sRunningServiceWorkersMax) {
+    sRunningServiceWorkersMax = sRunningServiceWorkers;
+    LOG(("ServiceWorker max now %d", sRunningServiceWorkersMax));
+    Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_RUNNING_MAX,
+                         u"All"_ns, sRunningServiceWorkersMax);
+  }
+  MOZ_ASSERT(((int64_t)sRunningServiceWorkersFetch) + aFetchDelta >= 0);
+  sRunningServiceWorkersFetch += aFetchDelta;
+  if (sRunningServiceWorkersFetch > sRunningServiceWorkersFetchMax) {
+    sRunningServiceWorkersFetchMax = sRunningServiceWorkersFetch;
+    LOG(("ServiceWorker Fetch max now %d", sRunningServiceWorkersFetchMax));
+    Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_RUNNING_MAX,
+                         u"Fetch"_ns, sRunningServiceWorkersFetchMax);
+  }
+  LOG(("ServiceWorkers running now %d/%d", sRunningServiceWorkers,
+       sRunningServiceWorkersFetch));
+}
+
+void ServiceWorkerPrivate::CreationFailed() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mControllerChild);
+
+  if (mRemoteWorkerData.remoteType().Find(SERVICEWORKER_REMOTE_TYPE) !=
+      kNotFound) {
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::SERVICE_WORKER_ISOLATED_LAUNCH_TIME,
+        mServiceWorkerLaunchTimeStart);
+  } else {
+    Telemetry::AccumulateTimeDelta(Telemetry::SERVICE_WORKER_LAUNCH_TIME_2,
+                                   mServiceWorkerLaunchTimeStart);
+  }
+
+  Shutdown();
+}
+
+void ServiceWorkerPrivate::CreationSucceeded() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mInfo);
+  MOZ_ASSERT(mControllerChild);
+
+  if (mRemoteWorkerData.remoteType().Find(SERVICEWORKER_REMOTE_TYPE) !=
+      kNotFound) {
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::SERVICE_WORKER_ISOLATED_LAUNCH_TIME,
+        mServiceWorkerLaunchTimeStart);
+  } else {
+    Telemetry::AccumulateTimeDelta(Telemetry::SERVICE_WORKER_LAUNCH_TIME_2,
+                                   mServiceWorkerLaunchTimeStart);
+  }
+
+  RenewKeepAliveToken();
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  nsCOMPtr<nsIPrincipal> principal = mInfo->Principal();
+  RefPtr<ServiceWorkerRegistrationInfo> regInfo =
+      swm->GetRegistration(principal, mInfo->Scope());
+  if (regInfo) {
+    // If it's already set, we're done and the running count is already set
+    if (mHandlesFetch == Unknown) {
+      if (regInfo->GetActive()) {
+        mHandlesFetch =
+            regInfo->GetActive()->HandlesFetch() ? Enabled : Disabled;
+        if (mHandlesFetch == Enabled) {
+          UpdateRunning(0, 1);
+        }
+      }
+      // else we're likely still in Evaluating state, and don't know if it
+      // handles fetch.  If so, defer updating the counter for Fetch until we
+      // finish evaluation.  We already updated the Running count for All in
+      // SpawnWorkerIfNeeded().
+    }
+  }
+}
+
+void ServiceWorkerPrivate::ErrorReceived(const ErrorValue& aError) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+  MOZ_ASSERT(mControllerChild);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_ASSERT(swm);
+
+  ServiceWorkerInfo* info = mInfo;
+
+  swm->HandleError(nullptr, info->Principal(), info->Scope(),
+                   NS_ConvertUTF8toUTF16(info->ScriptSpec()), u""_ns, u""_ns,
+                   u""_ns, 0, 0, nsIScriptError::errorFlag, JSEXN_ERR);
+}
+
+void ServiceWorkerPrivate::Terminated() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+  MOZ_ASSERT(mControllerChild);
+
+  Shutdown();
+}
+
+void ServiceWorkerPrivate::RefreshRemoteWorkerData(
+    const RefPtr<ServiceWorkerRegistrationInfo>& aRegistration) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInfo);
+
+  ServiceWorkerData& serviceWorkerData =
+      mRemoteWorkerData.serviceWorkerData().get_ServiceWorkerData();
+  serviceWorkerData.descriptor() = mInfo->Descriptor().ToIPC();
+  serviceWorkerData.registrationDescriptor() =
+      aRegistration->Descriptor().ToIPC();
+}
+
+RefPtr<FetchServicePromises> ServiceWorkerPrivate::SetupNavigationPreload(
+    nsCOMPtr<nsIInterceptedChannel>& aChannel,
+    const RefPtr<ServiceWorkerRegistrationInfo>& aRegistration) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  AssertIsOnMainThread();
+
+  // create IPC request from the intercepted channel.
+  auto result = GetIPCInternalRequest(aChannel);
+  if (result.isErr()) {
+    return nullptr;
+  }
+  IPCInternalRequest ipcRequest = result.unwrap();
+
+  // Step 1. Clone the request for preload
+  // Create the InternalResponse from the created IPCRequest.
+  SafeRefPtr<InternalRequest> preloadRequest =
+      MakeSafeRefPtr<InternalRequest>(ipcRequest);
+  // Copy the request body from uploadChannel
+  nsCOMPtr<nsIUploadChannel2> uploadChannel = do_QueryInterface(aChannel);
+  if (uploadChannel) {
+    nsCOMPtr<nsIInputStream> uploadStream;
+    nsresult rv = uploadChannel->CloneUploadStream(
+        &ipcRequest.bodySize(), getter_AddRefs(uploadStream));
+    // Fail to get the request's body, stop navigation preload by returning
+    // nullptr.
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return FetchService::NetworkErrorResponse(rv);
+    }
+    preloadRequest->SetBody(uploadStream, ipcRequest.bodySize());
+  }
+
+  // Set SkipServiceWorker for the navigation preload request
+  preloadRequest->SetSkipServiceWorker();
+
+  // Step 2. Append Service-Worker-Navigation-Preload header with
+  //         registration->GetNavigationPreloadState().headerValue() on
+  //         request's header list.
+  IgnoredErrorResult err;
+  auto headersGuard = preloadRequest->Headers()->Guard();
+  preloadRequest->Headers()->SetGuard(HeadersGuardEnum::None, err);
+  preloadRequest->Headers()->Append(
+      "Service-Worker-Navigation-Preload"_ns,
+      aRegistration->GetNavigationPreloadState().headerValue(), err);
+  preloadRequest->Headers()->SetGuard(headersGuard, err);
+
+  // Step 3. Perform fetch through FetchService with the cloned request
+  if (!err.Failed()) {
+    nsCOMPtr<nsIChannel> underlyingChannel;
+    MOZ_ALWAYS_SUCCEEDS(
+        aChannel->GetChannel(getter_AddRefs(underlyingChannel)));
+    RefPtr<FetchService> fetchService = FetchService::GetInstance();
+    return fetchService->Fetch(AsVariant(FetchService::NavigationPreloadArgs{
+        std::move(preloadRequest), underlyingChannel}));
+  }
+  return FetchService::NetworkErrorResponse(NS_ERROR_UNEXPECTED);
+}
+
+void ServiceWorkerPrivate::Shutdown() {
+  AssertIsOnMainThread();
+
+  if (mControllerChild) {
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+
+    MOZ_ASSERT(swm,
+               "All Service Workers should start shutting down before the "
+               "ServiceWorkerManager does!");
+
+    auto shutdownStateId = swm->MaybeInitServiceWorkerShutdownProgress();
+
+    RefPtr<GenericNonExclusivePromise> promise =
+        ShutdownInternal(shutdownStateId);
+    swm->BlockShutdownOn(promise, shutdownStateId);
+  }
+
+  MOZ_ASSERT(!mControllerChild);
+}
+
+RefPtr<GenericNonExclusivePromise> ServiceWorkerPrivate::ShutdownInternal(
+    uint32_t aShutdownStateId) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mControllerChild);
+
+  mPendingFunctionalEvents.Clear();
+
+  mControllerChild->get()->RevokeObserver(this);
+
+  if (StaticPrefs::dom_serviceWorkers_testing_enabled()) {
+    nsCOMPtr<nsIObserverService> os = services::GetObserverService();
+    if (os) {
+      os->NotifyObservers(nullptr, "service-worker-shutdown", nullptr);
+    }
+  }
+
+  RefPtr<GenericNonExclusivePromise::Private> promise =
+      new GenericNonExclusivePromise::Private(__func__);
+
+  Unused << ExecServiceWorkerOp(
+      ServiceWorkerTerminateWorkerOpArgs(aShutdownStateId),
+      [promise](ServiceWorkerOpResult&& aResult) {
+        MOZ_ASSERT(aResult.type() == ServiceWorkerOpResult::Tnsresult);
+        promise->Resolve(true, __func__);
+      },
+      [promise]() { promise->Reject(NS_ERROR_DOM_ABORT_ERR, __func__); });
+
+  /**
+   * After dispatching a termination operation, no new operations should
+   * be routed through this actor anymore.
+   */
+  mControllerChild = nullptr;
+
+  // Update here, since Evaluation failures directly call ShutdownInternal
+  UpdateRunning(-1, mHandlesFetch == Enabled ? -1 : 0);
+
+  return promise;
+}
+
+nsresult ServiceWorkerPrivate::ExecServiceWorkerOp(
+    ServiceWorkerOpArgs&& aArgs,
+    std::function<void(ServiceWorkerOpResult&&)>&& aSuccessCallback,
+    std::function<void()>&& aFailureCallback) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(
+      aArgs.type() !=
+          ServiceWorkerOpArgs::TParentToChildServiceWorkerFetchEventOpArgs,
+      "FetchEvent operations should be sent through FetchEventOp(Proxy) "
+      "actors!");
+  MOZ_ASSERT(aSuccessCallback);
+
+  nsresult rv = SpawnWorkerIfNeeded();
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aFailureCallback();
+    return rv;
+  }
+
+  MOZ_ASSERT(mControllerChild);
+
+  RefPtr<ServiceWorkerPrivate> self = this;
+  RefPtr<RAIIActorPtrHolder> holder = mControllerChild;
+  RefPtr<KeepAliveToken> token =
+      aArgs.type() == ServiceWorkerOpArgs::TServiceWorkerTerminateWorkerOpArgs
+          ? nullptr
+          : CreateEventKeepAliveToken();
+
+  /**
+   * NOTE: moving `aArgs` won't do anything until IPDL `SendMethod()` methods
+   * can accept rvalue references rather than just const references.
+   */
+  mControllerChild->get()->SendExecServiceWorkerOp(aArgs)->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [self = std::move(self), holder = std::move(holder),
+       token = std::move(token), onSuccess = std::move(aSuccessCallback),
+       onFailure = std::move(aFailureCallback)](
+          PRemoteWorkerControllerChild::ExecServiceWorkerOpPromise::
+              ResolveOrRejectValue&& aResult) {
+        if (NS_WARN_IF(aResult.IsReject())) {
+          onFailure();
+          return;
+        }
+
+        onSuccess(std::move(aResult.ResolveValue()));
+      });
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerPrivate.h b/dom/serviceworkers/ServiceWorkerPrivate.h
new file mode 100644
index 0000000000..c32bc00ec2
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerPrivate.h
@@ -0,0 +1,384 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerprivate_h
+#define mozilla_dom_serviceworkerprivate_h
+
+#include <functional>
+#include <type_traits>
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/FetchService.h"
+#include "mozilla/dom/RemoteWorkerController.h"
+#include "mozilla/dom/RemoteWorkerTypes.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+#include "nsCOMPtr.h"
+#include "nsISupportsImpl.h"
+#include "nsTArray.h"
+
+#define NOTIFICATION_CLICK_EVENT_NAME u"notificationclick"
+#define NOTIFICATION_CLOSE_EVENT_NAME u"notificationclose"
+
+class nsIInterceptedChannel;
+class nsIWorkerDebugger;
+
+namespace mozilla {
+
+template <typename T>
+class Maybe;
+
+class JSObjectHolder;
+
+namespace dom {
+
+class ClientInfoAndState;
+class RemoteWorkerControllerChild;
+class ServiceWorkerCloneData;
+class ServiceWorkerInfo;
+class ServiceWorkerPrivate;
+class ServiceWorkerRegistrationInfo;
+
+namespace ipc {
+class StructuredCloneData;
+}  // namespace ipc
+
+class LifeCycleEventCallback : public Runnable {
+ public:
+  LifeCycleEventCallback() : Runnable("dom::LifeCycleEventCallback") {}
+
+  // Called on the worker thread.
+  virtual void SetResult(bool aResult) = 0;
+};
+
+// Used to keep track of pending waitUntil as well as in-flight extendable
+// events. When the last token is released, we attempt to terminate the worker.
+class KeepAliveToken final : public nsISupports {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit KeepAliveToken(ServiceWorkerPrivate* aPrivate);
+
+ private:
+  ~KeepAliveToken();
+
+  RefPtr<ServiceWorkerPrivate> mPrivate;
+};
+
+class ServiceWorkerPrivate final : public RemoteWorkerObserver {
+  friend class KeepAliveToken;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerPrivate, override);
+
+  using PromiseExtensionWorkerHasListener = MozPromise<bool, nsresult, false>;
+
+ public:
+  explicit ServiceWorkerPrivate(ServiceWorkerInfo* aInfo);
+
+  nsresult SendMessageEvent(RefPtr<ServiceWorkerCloneData>&& aData,
+                            const ClientInfoAndState& aClientInfoAndState);
+
+  // This is used to validate the worker script and continue the installation
+  // process.
+  nsresult CheckScriptEvaluation(RefPtr<LifeCycleEventCallback> aCallback);
+
+  nsresult SendLifeCycleEvent(const nsAString& aEventType,
+                              RefPtr<LifeCycleEventCallback> aCallback);
+
+  nsresult SendPushEvent(const nsAString& aMessageId,
+                         const Maybe<nsTArray<uint8_t>>& aData,
+                         RefPtr<ServiceWorkerRegistrationInfo> aRegistration);
+
+  nsresult SendPushSubscriptionChangeEvent();
+
+  nsresult SendNotificationEvent(const nsAString& aEventName,
+                                 const nsAString& aID, const nsAString& aTitle,
+                                 const nsAString& aDir, const nsAString& aLang,
+                                 const nsAString& aBody, const nsAString& aTag,
+                                 const nsAString& aIcon, const nsAString& aData,
+                                 const nsAString& aBehavior,
+                                 const nsAString& aScope);
+
+  nsresult SendFetchEvent(nsCOMPtr<nsIInterceptedChannel> aChannel,
+                          nsILoadGroup* aLoadGroup, const nsAString& aClientId,
+                          const nsAString& aResultingClientId);
+
+  Result<RefPtr<PromiseExtensionWorkerHasListener>, nsresult>
+  WakeForExtensionAPIEvent(const nsAString& aExtensionAPINamespace,
+                           const nsAString& aEXtensionAPIEventName);
+
+  // This will terminate the current running worker thread and drop the
+  // workerPrivate reference.
+  // Called by ServiceWorkerInfo when [[Clear Registration]] is invoked
+  // or whenever the spec mandates that we terminate the worker.
+  // This is a no-op if the worker has already been stopped.
+  void TerminateWorker();
+
+  void NoteDeadServiceWorkerInfo();
+
+  void NoteStoppedControllingDocuments();
+
+  void UpdateState(ServiceWorkerState aState);
+
+  nsresult GetDebugger(nsIWorkerDebugger** aResult);
+
+  nsresult AttachDebugger();
+
+  nsresult DetachDebugger();
+
+  bool IsIdle() const;
+
+  // This promise is used schedule clearing of the owning registrations and its
+  // associated Service Workers if that registration becomes "unreachable" by
+  // the ServiceWorkerManager. This occurs under two conditions, which are the
+  // preconditions to calling this method:
+  // - The owning registration must be unregistered.
+  // - The associated Service Worker must *not* be controlling clients.
+  //
+  // Additionally, perhaps stating the obvious, the associated Service Worker
+  // must *not* be idle (whatever must be done "when idle" can just be done
+  // immediately).
+  RefPtr<GenericPromise> GetIdlePromise();
+
+  void SetHandlesFetch(bool aValue);
+
+  RefPtr<GenericPromise> SetSkipWaitingFlag();
+
+  static void RunningShutdown() {
+    // Force a final update of the number of running ServiceWorkers
+    UpdateRunning(0, 0);
+    MOZ_ASSERT(sRunningServiceWorkers == 0);
+    MOZ_ASSERT(sRunningServiceWorkersFetch == 0);
+  }
+
+  /**
+   * Update Telemetry for # of running ServiceWorkers
+   */
+  static void UpdateRunning(int32_t aDelta, int32_t aFetchDelta);
+
+ private:
+  // Timer callbacks
+  void NoteIdleWorkerCallback(nsITimer* aTimer);
+
+  void TerminateWorkerCallback(nsITimer* aTimer);
+
+  void RenewKeepAliveToken();
+
+  void ResetIdleTimeout();
+
+  void AddToken();
+
+  void ReleaseToken();
+
+  already_AddRefed<KeepAliveToken> CreateEventKeepAliveToken();
+
+  nsresult SpawnWorkerIfNeeded();
+
+  ~ServiceWorkerPrivate();
+
+  nsresult Initialize();
+
+  /**
+   * RemoteWorkerObserver
+   */
+  void CreationFailed() override;
+
+  void CreationSucceeded() override;
+
+  void ErrorReceived(const ErrorValue& aError) override;
+
+  void LockNotified(bool aCreated) final {
+    // no-op for service workers
+  }
+
+  void WebTransportNotified(bool aCreated) final {
+    // no-op for service workers
+  }
+
+  void Terminated() override;
+
+  // Refreshes only the parts of mRemoteWorkerData that may change over time.
+  void RefreshRemoteWorkerData(
+      const RefPtr<ServiceWorkerRegistrationInfo>& aRegistration);
+
+  nsresult SendPushEventInternal(
+      RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+      ServiceWorkerPushEventOpArgs&& aArgs);
+
+  // Setup the navigation preload by the intercepted channel and the
+  // RegistrationInfo.
+  RefPtr<FetchServicePromises> SetupNavigationPreload(
+      nsCOMPtr<nsIInterceptedChannel>& aChannel,
+      const RefPtr<ServiceWorkerRegistrationInfo>& aRegistration);
+
+  nsresult SendFetchEventInternal(
+      RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+      ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+      nsCOMPtr<nsIInterceptedChannel>&& aChannel,
+      RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises);
+
+  void Shutdown();
+
+  RefPtr<GenericNonExclusivePromise> ShutdownInternal(
+      uint32_t aShutdownStateId);
+
+  nsresult ExecServiceWorkerOp(
+      ServiceWorkerOpArgs&& aArgs,
+      std::function<void(ServiceWorkerOpResult&&)>&& aSuccessCallback,
+      std::function<void()>&& aFailureCallback = [] {});
+
+  class PendingFunctionalEvent {
+   public:
+    PendingFunctionalEvent(
+        ServiceWorkerPrivate* aOwner,
+        RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration);
+
+    virtual ~PendingFunctionalEvent();
+
+    virtual nsresult Send() = 0;
+
+   protected:
+    ServiceWorkerPrivate* const MOZ_NON_OWNING_REF mOwner;
+    RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
+  };
+
+  class PendingPushEvent final : public PendingFunctionalEvent {
+   public:
+    PendingPushEvent(ServiceWorkerPrivate* aOwner,
+                     RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+                     ServiceWorkerPushEventOpArgs&& aArgs);
+
+    nsresult Send() override;
+
+   private:
+    ServiceWorkerPushEventOpArgs mArgs;
+  };
+
+  class PendingFetchEvent final : public PendingFunctionalEvent {
+   public:
+    PendingFetchEvent(
+        ServiceWorkerPrivate* aOwner,
+        RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+        ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+        nsCOMPtr<nsIInterceptedChannel>&& aChannel,
+        RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises);
+
+    nsresult Send() override;
+
+    ~PendingFetchEvent();
+
+   private:
+    ParentToParentServiceWorkerFetchEventOpArgs mArgs;
+    nsCOMPtr<nsIInterceptedChannel> mChannel;
+    // The promises from FetchService. It indicates if the preload response is
+    // ready or not. The promise's resolve/reject value should be handled in
+    // FetchEventOpChild, such that the preload result can be propagated to the
+    // ServiceWorker through IPC. However, FetchEventOpChild creation could be
+    // pending here, so this member is needed. And it will be forwarded to
+    // FetchEventOpChild when crearting the FetchEventOpChild.
+    RefPtr<FetchServicePromises> mPreloadResponseReadyPromises;
+  };
+
+  nsTArray<UniquePtr<PendingFunctionalEvent>> mPendingFunctionalEvents;
+
+  /**
+   * It's possible that there are still in-progress operations when a
+   * a termination operation is issued. In this case, it's important to keep
+   * the RemoteWorkerControllerChild actor alive until all pending operations
+   * have completed before destroying it with Send__delete__().
+   *
+   * RAIIActorPtrHolder holds a singular, owning reference to a
+   * RemoteWorkerControllerChild actor and is responsible for destroying the
+   * actor in its (i.e. the holder's) destructor. This implies that all
+   * in-progress operations must maintain a strong reference to their
+   * corresponding holders and release the reference once completed/canceled.
+   *
+   * Additionally a RAIIActorPtrHolder must be initialized with a non-null actor
+   * and cannot be moved or copied. Therefore, the identities of two held
+   * actors can be compared by simply comparing their holders' addresses.
+   */
+  class RAIIActorPtrHolder final {
+   public:
+    NS_INLINE_DECL_REFCOUNTING(RAIIActorPtrHolder)
+
+    explicit RAIIActorPtrHolder(
+        already_AddRefed<RemoteWorkerControllerChild> aActor);
+
+    RAIIActorPtrHolder(const RAIIActorPtrHolder& aOther) = delete;
+    RAIIActorPtrHolder& operator=(const RAIIActorPtrHolder& aOther) = delete;
+
+    RAIIActorPtrHolder(RAIIActorPtrHolder&& aOther) = delete;
+    RAIIActorPtrHolder& operator=(RAIIActorPtrHolder&& aOther) = delete;
+
+    RemoteWorkerControllerChild* operator->() const
+        MOZ_NO_ADDREF_RELEASE_ON_RETURN;
+
+    RemoteWorkerControllerChild* get() const;
+
+    RefPtr<GenericPromise> OnDestructor();
+
+   private:
+    ~RAIIActorPtrHolder();
+
+    MozPromiseHolder<GenericPromise> mDestructorPromiseHolder;
+
+    const RefPtr<RemoteWorkerControllerChild> mActor;
+  };
+
+  RefPtr<RAIIActorPtrHolder> mControllerChild;
+
+  RemoteWorkerData mRemoteWorkerData;
+
+  TimeStamp mServiceWorkerLaunchTimeStart;
+
+  // Counters for Telemetry - totals running simultaneously, and those that
+  // handle Fetch, plus Max values for each
+  static uint32_t sRunningServiceWorkers;
+  static uint32_t sRunningServiceWorkersFetch;
+  static uint32_t sRunningServiceWorkersMax;
+  static uint32_t sRunningServiceWorkersFetchMax;
+
+  // We know the state after we've evaluated the worker, and we then store
+  // it in the registration.  The only valid state transition should be
+  // from Unknown to Enabled or Disabled.
+  enum { Unknown, Enabled, Disabled } mHandlesFetch{Unknown};
+
+  // The info object owns us. It is possible to outlive it for a brief period
+  // of time if there are pending waitUntil promises, in which case it
+  // will be null and |SpawnWorkerIfNeeded| will always fail.
+  ServiceWorkerInfo* MOZ_NON_OWNING_REF mInfo;
+
+  nsCOMPtr<nsITimer> mIdleWorkerTimer;
+
+  // We keep a token for |dom.serviceWorkers.idle_timeout| seconds to give the
+  // worker a grace period after each event.
+  RefPtr<KeepAliveToken> mIdleKeepAliveToken;
+
+  uint64_t mDebuggerCount;
+
+  uint64_t mTokenCount;
+
+  // Used by the owning `ServiceWorkerRegistrationInfo` when it wants to call
+  // `Clear` after being unregistered and isn't controlling any clients but this
+  // worker (i.e. the registration's active worker) isn't idle yet. Note that
+  // such an event should happen at most once in a
+  // `ServiceWorkerRegistrationInfo`s lifetime, so this promise should also only
+  // be obtained at most once.
+  MozPromiseHolder<GenericPromise> mIdlePromiseHolder;
+
+#ifdef DEBUG
+  bool mIdlePromiseObtained = false;
+#endif
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_serviceworkerprivate_h
diff --git a/dom/serviceworkers/ServiceWorkerProxy.cpp b/dom/serviceworkers/ServiceWorkerProxy.cpp
new file mode 100644
index 0000000000..24480dd5c7
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerProxy.cpp
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerProxy.h"
+#include "ServiceWorkerCloneData.h"
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerParent.h"
+
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/dom/ClientState.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "ServiceWorkerInfo.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::AssertIsOnBackgroundThread;
+
+ServiceWorkerProxy::~ServiceWorkerProxy() {
+  // Any thread
+  MOZ_DIAGNOSTIC_ASSERT(!mActor);
+  MOZ_DIAGNOSTIC_ASSERT(!mInfo);
+}
+
+void ServiceWorkerProxy::MaybeShutdownOnBGThread() {
+  AssertIsOnBackgroundThread();
+  if (!mActor) {
+    return;
+  }
+  mActor->MaybeSendDelete();
+}
+
+void ServiceWorkerProxy::InitOnMainThread() {
+  AssertIsOnMainThread();
+
+  auto scopeExit = MakeScopeExit([&] { MaybeShutdownOnMainThread(); });
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  NS_ENSURE_TRUE_VOID(swm);
+
+  RefPtr<ServiceWorkerRegistrationInfo> reg =
+      swm->GetRegistration(mDescriptor.PrincipalInfo(), mDescriptor.Scope());
+  NS_ENSURE_TRUE_VOID(reg);
+
+  RefPtr<ServiceWorkerInfo> info = reg->GetByDescriptor(mDescriptor);
+  NS_ENSURE_TRUE_VOID(info);
+
+  scopeExit.release();
+
+  mInfo = new nsMainThreadPtrHolder<ServiceWorkerInfo>(
+      "ServiceWorkerProxy::mInfo", info);
+}
+
+void ServiceWorkerProxy::MaybeShutdownOnMainThread() {
+  AssertIsOnMainThread();
+
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      __func__, this, &ServiceWorkerProxy::MaybeShutdownOnBGThread);
+
+  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
+}
+
+void ServiceWorkerProxy::StopListeningOnMainThread() {
+  AssertIsOnMainThread();
+  mInfo = nullptr;
+}
+
+ServiceWorkerProxy::ServiceWorkerProxy(
+    const ServiceWorkerDescriptor& aDescriptor)
+    : mEventTarget(GetCurrentSerialEventTarget()), mDescriptor(aDescriptor) {}
+
+void ServiceWorkerProxy::Init(ServiceWorkerParent* aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(aActor);
+  MOZ_DIAGNOSTIC_ASSERT(!mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mEventTarget);
+
+  mActor = aActor;
+
+  // Note, this must be done from a separate Init() method and not in
+  // the constructor.  If done from the constructor the runnable can
+  // execute, complete, and release its reference before the constructor
+  // returns.
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      "ServiceWorkerProxy::Init", this, &ServiceWorkerProxy::InitOnMainThread);
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+}
+
+void ServiceWorkerProxy::RevokeActor(ServiceWorkerParent* aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor = nullptr;
+
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      __func__, this, &ServiceWorkerProxy::StopListeningOnMainThread);
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+}
+
+void ServiceWorkerProxy::PostMessage(RefPtr<ServiceWorkerCloneData>&& aData,
+                                     const ClientInfo& aClientInfo,
+                                     const ClientState& aClientState) {
+  AssertIsOnBackgroundThread();
+  RefPtr<ServiceWorkerProxy> self = this;
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__,
+      [self, data = std::move(aData), aClientInfo, aClientState]() mutable {
+        if (!self->mInfo) {
+          return;
+        }
+        self->mInfo->PostMessage(std::move(data), aClientInfo, aClientState);
+      });
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerProxy.h b/dom/serviceworkers/ServiceWorkerProxy.h
new file mode 100644
index 0000000000..b8b5d7145e
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerProxy.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef moz_dom_ServiceWorkerProxy_h
+#define moz_dom_ServiceWorkerProxy_h
+
+#include "nsProxyRelease.h"
+#include "ServiceWorkerDescriptor.h"
+
+namespace mozilla::dom {
+
+class ClientInfo;
+class ClientState;
+class ServiceWorkerCloneData;
+class ServiceWorkerInfo;
+class ServiceWorkerParent;
+
+class ServiceWorkerProxy final {
+  // Background thread only
+  RefPtr<ServiceWorkerParent> mActor;
+
+  // Written on background thread and read on main thread
+  nsCOMPtr<nsISerialEventTarget> mEventTarget;
+
+  // Main thread only
+  ServiceWorkerDescriptor mDescriptor;
+  nsMainThreadPtrHandle<ServiceWorkerInfo> mInfo;
+
+  ~ServiceWorkerProxy();
+
+  // Background thread methods
+  void MaybeShutdownOnBGThread();
+
+  void SetStateOnBGThread(ServiceWorkerState aState);
+
+  // Main thread methods
+  void InitOnMainThread();
+
+  void MaybeShutdownOnMainThread();
+
+  void StopListeningOnMainThread();
+
+ public:
+  explicit ServiceWorkerProxy(const ServiceWorkerDescriptor& aDescriptor);
+
+  void Init(ServiceWorkerParent* aActor);
+
+  void RevokeActor(ServiceWorkerParent* aActor);
+
+  void PostMessage(RefPtr<ServiceWorkerCloneData>&& aData,
+                   const ClientInfo& aClientInfo, const ClientState& aState);
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerProxy);
+};
+
+}  // namespace mozilla::dom
+
+#endif  // moz_dom_ServiceWorkerProxy_h
diff --git a/dom/serviceworkers/ServiceWorkerQuotaUtils.cpp b/dom/serviceworkers/ServiceWorkerQuotaUtils.cpp
new file mode 100644
index 0000000000..65e051eb40
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerQuotaUtils.cpp
@@ -0,0 +1,327 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MainThreadUtils.h"
+#include "ServiceWorkerQuotaUtils.h"
+
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/dom/quota/QuotaManagerService.h"
+#include "nsIClearDataService.h"
+#include "nsID.h"
+#include "nsIPrincipal.h"
+#include "nsIQuotaCallbacks.h"
+#include "nsIQuotaRequests.h"
+#include "nsIQuotaResults.h"
+#include "nsISupports.h"
+#include "nsIVariant.h"
+#include "nsServiceManagerUtils.h"
+
+using mozilla::dom::quota::QuotaManagerService;
+
+namespace mozilla::dom {
+
+/*
+ * QuotaUsageChecker implements the quota usage checking algorithm.
+ *
+ * 1. Getting the given origin/group usage through QuotaManagerService.
+ *    QuotaUsageCheck::Start() implements this step.
+ * 2. Checking if the group usage headroom is satisfied.
+ *    It could be following three situations.
+ *    a. Group headroom is satisfied without any usage mitigation.
+ *    b. Group headroom is satisfied after origin usage mitigation.
+ *       This invokes nsIClearDataService::DeleteDataFromPrincipal().
+ *    c. Group headroom is satisfied after group usage mitigation.
+ *       This invokes nsIClearDataService::DeleteDataFromBaseDomain().
+ *    QuotaUsageChecker::CheckQuotaHeadroom() implements this step.
+ *
+ * If the algorithm is done or error out, the QuotaUsageCheck::mCallback will
+ * be called with a bool result for external handling.
+ */
+class QuotaUsageChecker final : public nsIQuotaCallback,
+                                public nsIQuotaUsageCallback,
+                                public nsIClearDataCallback {
+ public:
+  NS_DECL_ISUPPORTS
+  // For QuotaManagerService::Estimate()
+  NS_DECL_NSIQUOTACALLBACK
+
+  // For QuotaManagerService::GetUsageForPrincipal()
+  NS_DECL_NSIQUOTAUSAGECALLBACK
+
+  // For nsIClearDataService::DeleteDataFromPrincipal() and
+  // nsIClearDataService::DeleteDataFromBaseDomain()
+  NS_DECL_NSICLEARDATACALLBACK
+
+  QuotaUsageChecker(nsIPrincipal* aPrincipal,
+                    ServiceWorkerQuotaMitigationCallback&& aCallback);
+
+  void Start();
+
+  void RunCallback(bool aResult);
+
+ private:
+  ~QuotaUsageChecker() = default;
+
+  // This is a general help method to get nsIQuotaResult/nsIQuotaUsageResult
+  // from nsIQuotaRequest/nsIQuotaUsageRequest
+  template <typename T, typename U>
+  nsresult GetResult(T* aRequest, U&);
+
+  void CheckQuotaHeadroom();
+
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+
+  // The external callback. Calling RunCallback(bool) instead of calling it
+  // directly, RunCallback(bool) handles the internal status.
+  ServiceWorkerQuotaMitigationCallback mCallback;
+  bool mGettingOriginUsageDone;
+  bool mGettingGroupUsageDone;
+  bool mIsChecking;
+  uint64_t mOriginUsage;
+  uint64_t mGroupUsage;
+  uint64_t mGroupLimit;
+};
+
+NS_IMPL_ISUPPORTS(QuotaUsageChecker, nsIQuotaCallback, nsIQuotaUsageCallback,
+                  nsIClearDataCallback)
+
+QuotaUsageChecker::QuotaUsageChecker(
+    nsIPrincipal* aPrincipal, ServiceWorkerQuotaMitigationCallback&& aCallback)
+    : mPrincipal(aPrincipal),
+      mCallback(std::move(aCallback)),
+      mGettingOriginUsageDone(false),
+      mGettingGroupUsageDone(false),
+      mIsChecking(false),
+      mOriginUsage(0),
+      mGroupUsage(0),
+      mGroupLimit(0) {}
+
+void QuotaUsageChecker::Start() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mIsChecking) {
+    return;
+  }
+  mIsChecking = true;
+
+  RefPtr<QuotaUsageChecker> self = this;
+  auto scopeExit = MakeScopeExit([self]() { self->RunCallback(false); });
+
+  RefPtr<QuotaManagerService> qms = QuotaManagerService::GetOrCreate();
+  MOZ_ASSERT(qms);
+
+  // Asynchronious getting quota usage for principal
+  nsCOMPtr<nsIQuotaUsageRequest> usageRequest;
+  if (NS_WARN_IF(NS_FAILED(qms->GetUsageForPrincipal(
+          mPrincipal, this, false, getter_AddRefs(usageRequest))))) {
+    return;
+  }
+
+  // Asynchronious getting group usage and limit
+  nsCOMPtr<nsIQuotaRequest> request;
+  if (NS_WARN_IF(
+          NS_FAILED(qms->Estimate(mPrincipal, getter_AddRefs(request))))) {
+    return;
+  }
+  request->SetCallback(this);
+
+  scopeExit.release();
+}
+
+void QuotaUsageChecker::RunCallback(bool aResult) {
+  MOZ_ASSERT(mIsChecking && mCallback);
+  if (!mIsChecking) {
+    return;
+  }
+  mIsChecking = false;
+  mGettingOriginUsageDone = false;
+  mGettingGroupUsageDone = false;
+
+  mCallback(aResult);
+  mCallback = nullptr;
+}
+
+template <typename T, typename U>
+nsresult QuotaUsageChecker::GetResult(T* aRequest, U& aResult) {
+  nsCOMPtr<nsIVariant> result;
+  nsresult rv = aRequest->GetResult(getter_AddRefs(result));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsID* iid;
+  nsCOMPtr<nsISupports> supports;
+  rv = result->GetAsInterface(&iid, getter_AddRefs(supports));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  free(iid);
+
+  aResult = do_QueryInterface(supports);
+  return NS_OK;
+}
+
+void QuotaUsageChecker::CheckQuotaHeadroom() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  const uint64_t groupHeadroom =
+      static_cast<uint64_t>(
+          StaticPrefs::
+              dom_serviceWorkers_mitigations_group_usage_headroom_kb()) *
+      1024;
+  const uint64_t groupAvailable = mGroupLimit - mGroupUsage;
+
+  // Group usage head room is satisfied, does not need the usage mitigation.
+  if (groupAvailable > groupHeadroom) {
+    RunCallback(true);
+    return;
+  }
+
+  RefPtr<QuotaUsageChecker> self = this;
+  auto scopeExit = MakeScopeExit([self]() { self->RunCallback(false); });
+
+  nsCOMPtr<nsIClearDataService> csd =
+      do_GetService("@mozilla.org/clear-data-service;1");
+  MOZ_ASSERT(csd);
+
+  // Group usage headroom is not satisfied even removing the origin usage,
+  // clear all group usage.
+  if ((groupAvailable + mOriginUsage) < groupHeadroom) {
+    nsAutoCString host;
+    nsresult rv = mPrincipal->GetHost(host);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+
+    rv = csd->DeleteDataFromBaseDomain(
+        host, false, nsIClearDataService::CLEAR_DOM_QUOTA, this);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+
+    // clear the origin usage since it makes group usage headroom be satisifed.
+  } else {
+    nsresult rv = csd->DeleteDataFromPrincipal(
+        mPrincipal, false, nsIClearDataService::CLEAR_DOM_QUOTA, this);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+  }
+
+  scopeExit.release();
+}
+
+// nsIQuotaUsageCallback implementation
+
+NS_IMETHODIMP QuotaUsageChecker::OnUsageResult(
+    nsIQuotaUsageRequest* aUsageRequest) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aUsageRequest);
+
+  RefPtr<QuotaUsageChecker> self = this;
+  auto scopeExit = MakeScopeExit([self]() { self->RunCallback(false); });
+
+  nsresult resultCode;
+  nsresult rv = aUsageRequest->GetResultCode(&resultCode);
+  if (NS_WARN_IF(NS_FAILED(rv) || NS_FAILED(resultCode))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIQuotaOriginUsageResult> usageResult;
+  rv = GetResult(aUsageRequest, usageResult);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  MOZ_ASSERT(usageResult);
+
+  rv = usageResult->GetUsage(&mOriginUsage);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  MOZ_ASSERT(!mGettingOriginUsageDone);
+  mGettingOriginUsageDone = true;
+
+  scopeExit.release();
+
+  // Call CheckQuotaHeadroom() when both
+  // QuotaManagerService::GetUsageForPrincipal() and
+  // QuotaManagerService::Estimate() are done.
+  if (mGettingOriginUsageDone && mGettingGroupUsageDone) {
+    CheckQuotaHeadroom();
+  }
+  return NS_OK;
+}
+
+// nsIQuotaCallback implementation
+
+NS_IMETHODIMP QuotaUsageChecker::OnComplete(nsIQuotaRequest* aRequest) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRequest);
+
+  RefPtr<QuotaUsageChecker> self = this;
+  auto scopeExit = MakeScopeExit([self]() { self->RunCallback(false); });
+
+  nsresult resultCode;
+  nsresult rv = aRequest->GetResultCode(&resultCode);
+  if (NS_WARN_IF(NS_FAILED(rv) || NS_FAILED(resultCode))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIQuotaEstimateResult> estimateResult;
+  rv = GetResult(aRequest, estimateResult);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  MOZ_ASSERT(estimateResult);
+
+  rv = estimateResult->GetUsage(&mGroupUsage);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = estimateResult->GetLimit(&mGroupLimit);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  MOZ_ASSERT(!mGettingGroupUsageDone);
+  mGettingGroupUsageDone = true;
+
+  scopeExit.release();
+
+  // Call CheckQuotaHeadroom() when both
+  // QuotaManagerService::GetUsageForPrincipal() and
+  // QuotaManagerService::Estimate() are done.
+  if (mGettingOriginUsageDone && mGettingGroupUsageDone) {
+    CheckQuotaHeadroom();
+  }
+  return NS_OK;
+}
+
+// nsIClearDataCallback implementation
+
+NS_IMETHODIMP QuotaUsageChecker::OnDataDeleted(uint32_t aFailedFlags) {
+  RunCallback(true);
+  return NS_OK;
+}
+
+// Helper methods in ServiceWorkerQuotaUtils.h
+
+void ClearQuotaUsageIfNeeded(nsIPrincipal* aPrincipal,
+                             ServiceWorkerQuotaMitigationCallback&& aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  RefPtr<QuotaUsageChecker> checker =
+      MakeRefPtr<QuotaUsageChecker>(aPrincipal, std::move(aCallback));
+  checker->Start();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerQuotaUtils.h b/dom/serviceworkers/ServiceWorkerQuotaUtils.h
new file mode 100644
index 0000000000..9f16f367ac
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerQuotaUtils.h
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _mozilla_dom_ServiceWorkerQuotaUtils_h
+#define _mozilla_dom_ServiceWorkerQuotaUtils_h
+
+#include <functional>
+
+class nsIPrincipal;
+class nsIQuotaUsageRequest;
+
+namespace mozilla::dom {
+
+using ServiceWorkerQuotaMitigationCallback = std::function<void(bool)>;
+
+void ClearQuotaUsageIfNeeded(nsIPrincipal* aPrincipal,
+                             ServiceWorkerQuotaMitigationCallback&& aCallback);
+
+}  // namespace mozilla::dom
+
+#endif
diff --git a/dom/serviceworkers/ServiceWorkerRegisterJob.cpp b/dom/serviceworkers/ServiceWorkerRegisterJob.cpp
new file mode 100644
index 0000000000..9d5f6db098
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegisterJob.cpp
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegisterJob.h"
+
+#include "mozilla/dom/WorkerCommon.h"
+#include "ServiceWorkerManager.h"
+
+namespace mozilla::dom {
+
+ServiceWorkerRegisterJob::ServiceWorkerRegisterJob(
+    nsIPrincipal* aPrincipal, const nsACString& aScope,
+    const nsACString& aScriptSpec, ServiceWorkerUpdateViaCache aUpdateViaCache)
+    : ServiceWorkerUpdateJob(Type::Register, aPrincipal, aScope,
+                             nsCString(aScriptSpec), aUpdateViaCache) {}
+
+void ServiceWorkerRegisterJob::AsyncExecute() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (Canceled() || !swm) {
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      swm->GetRegistration(mPrincipal, mScope);
+
+  if (registration) {
+    bool sameUVC = GetUpdateViaCache() == registration->GetUpdateViaCache();
+    registration->SetUpdateViaCache(GetUpdateViaCache());
+
+    RefPtr<ServiceWorkerInfo> newest = registration->Newest();
+    if (newest && mScriptSpec.Equals(newest->ScriptSpec()) && sameUVC) {
+      SetRegistration(registration);
+      Finish(NS_OK);
+      return;
+    }
+  } else {
+    registration =
+        swm->CreateNewRegistration(mScope, mPrincipal, GetUpdateViaCache());
+    if (!registration) {
+      FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+      return;
+    }
+  }
+
+  SetRegistration(registration);
+  Update();
+}
+
+ServiceWorkerRegisterJob::~ServiceWorkerRegisterJob() = default;
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegisterJob.h b/dom/serviceworkers/ServiceWorkerRegisterJob.h
new file mode 100644
index 0000000000..ab4259e606
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegisterJob.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerregisterjob_h
+#define mozilla_dom_serviceworkerregisterjob_h
+
+#include "ServiceWorkerUpdateJob.h"
+
+namespace mozilla::dom {
+
+// The register job.  This implements the steps in the spec Register algorithm,
+// but then uses ServiceWorkerUpdateJob to implement the Update and Install
+// spec algorithms.
+class ServiceWorkerRegisterJob final : public ServiceWorkerUpdateJob {
+ public:
+  ServiceWorkerRegisterJob(nsIPrincipal* aPrincipal, const nsACString& aScope,
+                           const nsACString& aScriptSpec,
+                           ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+ private:
+  // Implement the Register algorithm steps and then call the parent class
+  // Update() to complete the job execution.
+  virtual void AsyncExecute() override;
+
+  virtual ~ServiceWorkerRegisterJob();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerregisterjob_h
diff --git a/dom/serviceworkers/ServiceWorkerRegistrar.cpp b/dom/serviceworkers/ServiceWorkerRegistrar.cpp
new file mode 100644
index 0000000000..923c217b78
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrar.cpp
@@ -0,0 +1,1468 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistrar.h"
+#include "ServiceWorkerManager.h"
+#include "mozilla/dom/ServiceWorkerRegistrarTypes.h"
+#include "mozilla/dom/DOMException.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+#include "nsIEventTarget.h"
+#include "nsIInputStream.h"
+#include "nsILineInputStream.h"
+#include "nsIObserverService.h"
+#include "nsIOutputStream.h"
+#include "nsISafeOutputStream.h"
+#include "nsIServiceWorkerManager.h"
+#include "nsIURI.h"
+#include "nsIWritablePropertyBag2.h"
+
+#include "MainThreadUtils.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/dom/StorageActivityService.h"
+#include "mozilla/ErrorNames.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/ModuleUtils.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "ServiceWorkerUtils.h"
+
+using namespace mozilla::ipc;
+
+extern mozilla::LazyLogModule sWorkerTelemetryLog;
+
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(_args) MOZ_LOG(sWorkerTelemetryLog, LogLevel::Debug, _args);
+
+namespace mozilla::dom {
+
+namespace {
+
+static const char* gSupportedRegistrarVersions[] = {
+    SERVICEWORKERREGISTRAR_VERSION, "8", "7", "6", "5", "4", "3", "2"};
+
+static const uint32_t kInvalidGeneration = static_cast<uint32_t>(-1);
+
+StaticRefPtr<ServiceWorkerRegistrar> gServiceWorkerRegistrar;
+
+nsresult GetOriginAndBaseDomain(const nsACString& aURL, nsACString& aOrigin,
+                                nsACString& aBaseDomain) {
+  nsCOMPtr<nsIURI> url;
+  nsresult rv = NS_NewURI(getter_AddRefs(url), aURL);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  OriginAttributes attrs;
+  nsCOMPtr<nsIPrincipal> principal =
+      BasePrincipal::CreateContentPrincipal(url, attrs);
+  if (!principal) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  rv = principal->GetOriginNoSuffix(aOrigin);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = principal->GetBaseDomain(aBaseDomain);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult ReadLine(nsILineInputStream* aStream, nsACString& aValue) {
+  bool hasMoreLines;
+  nsresult rv = aStream->ReadLine(aValue, &hasMoreLines);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (NS_WARN_IF(!hasMoreLines)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+nsresult CreatePrincipalInfo(nsILineInputStream* aStream,
+                             ServiceWorkerRegistrationData* aEntry,
+                             bool aSkipSpec = false) {
+  nsAutoCString suffix;
+  nsresult rv = ReadLine(aStream, suffix);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  OriginAttributes attrs;
+  if (!attrs.PopulateFromSuffix(suffix)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aSkipSpec) {
+    nsAutoCString unused;
+    nsresult rv = ReadLine(aStream, unused);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  rv = ReadLine(aStream, aEntry->scope());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCString origin;
+  nsCString baseDomain;
+  rv = GetOriginAndBaseDomain(aEntry->scope(), origin, baseDomain);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  aEntry->principal() = mozilla::ipc::ContentPrincipalInfo(
+      attrs, origin, aEntry->scope(), Nothing(), baseDomain);
+
+  return NS_OK;
+}
+
+const IPCNavigationPreloadState gDefaultNavigationPreloadState(false,
+                                                               "true"_ns);
+
+}  // namespace
+
+NS_IMPL_ISUPPORTS(ServiceWorkerRegistrar, nsIObserver, nsIAsyncShutdownBlocker)
+
+void ServiceWorkerRegistrar::Initialize() {
+  MOZ_ASSERT(!gServiceWorkerRegistrar);
+
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  gServiceWorkerRegistrar = new ServiceWorkerRegistrar();
+  ClearOnShutdown(&gServiceWorkerRegistrar);
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    DebugOnly<nsresult> rv = obs->AddObserver(gServiceWorkerRegistrar,
+                                              "profile-after-change", false);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+}
+
+/* static */
+already_AddRefed<ServiceWorkerRegistrar> ServiceWorkerRegistrar::Get() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  MOZ_ASSERT(gServiceWorkerRegistrar);
+  RefPtr<ServiceWorkerRegistrar> service = gServiceWorkerRegistrar.get();
+  return service.forget();
+}
+
+ServiceWorkerRegistrar::ServiceWorkerRegistrar()
+    : mMonitor("ServiceWorkerRegistrar.mMonitor"),
+      mDataLoaded(false),
+      mDataGeneration(kInvalidGeneration),
+      mFileGeneration(kInvalidGeneration),
+      mRetryCount(0),
+      mShuttingDown(false),
+      mSaveDataRunnableDispatched(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+ServiceWorkerRegistrar::~ServiceWorkerRegistrar() {
+  MOZ_ASSERT(!mSaveDataRunnableDispatched);
+}
+
+void ServiceWorkerRegistrar::GetRegistrations(
+    nsTArray<ServiceWorkerRegistrationData>& aValues) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aValues.IsEmpty());
+
+  MonitorAutoLock lock(mMonitor);
+
+  // If we don't have the profile directory, profile is not started yet (and
+  // probably we are in a utest).
+  if (!mProfileDir) {
+    return;
+  }
+
+  // We care just about the first execution because this can be blocked by
+  // loading data from disk.
+  static bool firstTime = true;
+  TimeStamp startTime;
+
+  if (firstTime) {
+    startTime = TimeStamp::NowLoRes();
+  }
+
+  // Waiting for data loaded.
+  mMonitor.AssertCurrentThreadOwns();
+  while (!mDataLoaded) {
+    mMonitor.Wait();
+  }
+
+  aValues.AppendElements(mData);
+
+  MaybeResetGeneration();
+  MOZ_DIAGNOSTIC_ASSERT(mDataGeneration != kInvalidGeneration);
+  MOZ_DIAGNOSTIC_ASSERT(mFileGeneration != kInvalidGeneration);
+
+  if (firstTime) {
+    firstTime = false;
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::SERVICE_WORKER_REGISTRATION_LOADING, startTime);
+  }
+}
+
+namespace {
+
+bool Equivalent(const ServiceWorkerRegistrationData& aLeft,
+                const ServiceWorkerRegistrationData& aRight) {
+  MOZ_ASSERT(aLeft.principal().type() ==
+             mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+  MOZ_ASSERT(aRight.principal().type() ==
+             mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+
+  const auto& leftPrincipal = aLeft.principal().get_ContentPrincipalInfo();
+  const auto& rightPrincipal = aRight.principal().get_ContentPrincipalInfo();
+
+  // Only compare the attributes, not the spec part of the principal.
+  // The scope comparison above already covers the origin and codebase
+  // principals include the full path in their spec which is not what
+  // we want here.
+  return aLeft.scope() == aRight.scope() &&
+         leftPrincipal.attrs() == rightPrincipal.attrs();
+}
+
+}  // anonymous namespace
+
+void ServiceWorkerRegistrar::RegisterServiceWorker(
+    const ServiceWorkerRegistrationData& aData) {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to register a serviceWorker during shutting down.");
+    return;
+  }
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+    RegisterServiceWorkerInternal(aData);
+  }
+
+  MaybeScheduleSaveData();
+  StorageActivityService::SendActivity(aData.principal());
+}
+
+void ServiceWorkerRegistrar::UnregisterServiceWorker(
+    const PrincipalInfo& aPrincipalInfo, const nsACString& aScope) {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to unregister a serviceWorker during shutting down.");
+    return;
+  }
+
+  bool deleted = false;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+
+    ServiceWorkerRegistrationData tmp;
+    tmp.principal() = aPrincipalInfo;
+    tmp.scope() = aScope;
+
+    for (uint32_t i = 0; i < mData.Length(); ++i) {
+      if (Equivalent(tmp, mData[i])) {
+        gServiceWorkersRegistered--;
+        if (mData[i].currentWorkerHandlesFetch()) {
+          gServiceWorkersRegisteredFetch--;
+        }
+        // Update Telemetry
+        Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                             u"All"_ns, gServiceWorkersRegistered);
+        Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                             u"Fetch"_ns, gServiceWorkersRegisteredFetch);
+        LOG(("Unregister ServiceWorker: %u, fetch %u\n",
+             gServiceWorkersRegistered, gServiceWorkersRegisteredFetch));
+
+        mData.RemoveElementAt(i);
+        mDataGeneration = GetNextGeneration();
+        deleted = true;
+        break;
+      }
+    }
+  }
+
+  if (deleted) {
+    MaybeScheduleSaveData();
+    StorageActivityService::SendActivity(aPrincipalInfo);
+  }
+}
+
+void ServiceWorkerRegistrar::RemoveAll() {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to remove all the serviceWorkers during shutting down.");
+    return;
+  }
+
+  bool deleted = false;
+
+  nsTArray<ServiceWorkerRegistrationData> data;
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+
+    // Let's take a copy in order to inform StorageActivityService.
+    data = mData.Clone();
+
+    deleted = !mData.IsEmpty();
+    mData.Clear();
+
+    mDataGeneration = GetNextGeneration();
+  }
+
+  if (!deleted) {
+    return;
+  }
+
+  MaybeScheduleSaveData();
+
+  for (uint32_t i = 0, len = data.Length(); i < len; ++i) {
+    StorageActivityService::SendActivity(data[i].principal());
+  }
+}
+
+void ServiceWorkerRegistrar::LoadData() {
+  MOZ_ASSERT(!NS_IsMainThread());
+#ifdef DEBUG
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(!mDataLoaded);
+  }
+#endif
+
+  nsresult rv = ReadData();
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    DeleteData();
+    // Also if the reading failed we have to notify what is waiting for data.
+  }
+
+  MonitorAutoLock lock(mMonitor);
+  MOZ_ASSERT(!mDataLoaded);
+  mDataLoaded = true;
+  mMonitor.Notify();
+}
+
+bool ServiceWorkerRegistrar::ReloadDataForTest() {
+  if (NS_WARN_IF(!StaticPrefs::dom_serviceWorkers_testing_enabled())) {
+    return false;
+  }
+
+  MOZ_ASSERT(NS_IsMainThread());
+  MonitorAutoLock lock(mMonitor);
+  mData.Clear();
+  mDataLoaded = false;
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  nsCOMPtr<nsIRunnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::LoadData", this,
+                        &ServiceWorkerRegistrar::LoadData);
+  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch the LoadDataRunnable.");
+    return false;
+  }
+
+  mMonitor.AssertCurrentThreadOwns();
+  while (!mDataLoaded) {
+    mMonitor.Wait();
+  }
+
+  return mDataLoaded;
+}
+
+nsresult ServiceWorkerRegistrar::ReadData() {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+
+    if (!mProfileDir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  bool exists;
+  rv = file->Exists(&exists);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (!exists) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStream> stream;
+  rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsILineInputStream> lineInputStream = do_QueryInterface(stream);
+  MOZ_ASSERT(lineInputStream);
+
+  nsAutoCString version;
+  bool hasMoreLines;
+  rv = lineInputStream->ReadLine(version, &hasMoreLines);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (!IsSupportedVersion(version)) {
+    nsContentUtils::LogMessageToConsole(
+        nsPrintfCString("Unsupported service worker registrar version: %s",
+                        version.get())
+            .get());
+    return NS_ERROR_FAILURE;
+  }
+
+  nsTArray<ServiceWorkerRegistrationData> tmpData;
+
+  bool overwrite = false;
+  bool dedupe = false;
+  while (hasMoreLines) {
+    ServiceWorkerRegistrationData* entry = tmpData.AppendElement();
+
+#define GET_LINE(x)                                 \
+  rv = lineInputStream->ReadLine(x, &hasMoreLines); \
+  if (NS_WARN_IF(NS_FAILED(rv))) {                  \
+    return rv;                                      \
+  }                                                 \
+  if (NS_WARN_IF(!hasMoreLines)) {                  \
+    return NS_ERROR_FAILURE;                        \
+  }
+
+    nsAutoCString line;
+    if (version.EqualsLiteral(SERVICEWORKERREGISTRAR_VERSION)) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString updateViaCache;
+      GET_LINE(updateViaCache);
+      entry->updateViaCache() = updateViaCache.ToInteger(&rv, 16);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      if (entry->updateViaCache() >
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE) {
+        return NS_ERROR_INVALID_ARG;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      nsAutoCString navigationPreloadEnabledStr;
+      GET_LINE(navigationPreloadEnabledStr);
+      bool navigationPreloadEnabled =
+          navigationPreloadEnabledStr.ToInteger(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->navigationPreloadState().enabled() = navigationPreloadEnabled;
+
+      GET_LINE(entry->navigationPreloadState().headerValue());
+    } else if (version.EqualsLiteral("8")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString updateViaCache;
+      GET_LINE(updateViaCache);
+      entry->updateViaCache() = updateViaCache.ToInteger(&rv, 16);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      if (entry->updateViaCache() >
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE) {
+        return NS_ERROR_INVALID_ARG;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("7")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString loadFlags;
+      GET_LINE(loadFlags);
+      entry->updateViaCache() =
+          loadFlags.ToInteger(&rv, 16) == nsIRequest::LOAD_NORMAL
+              ? nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL
+              : nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("6")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString loadFlags;
+      GET_LINE(loadFlags);
+      entry->updateViaCache() =
+          loadFlags.ToInteger(&rv, 16) == nsIRequest::LOAD_NORMAL
+              ? nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL
+              : nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("5")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("4")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("3")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry, true);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("2")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry, true);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      // scriptSpec is no more used in latest version.
+      nsAutoCString unused;
+      GET_LINE(unused);
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      // waitingCacheName is no more used in latest version.
+      GET_LINE(unused);
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else {
+      MOZ_ASSERT_UNREACHABLE("Should never get here!");
+    }
+
+#undef GET_LINE
+
+    rv = lineInputStream->ReadLine(line, &hasMoreLines);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    if (!line.EqualsLiteral(SERVICEWORKERREGISTRAR_TERMINATOR)) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  stream->Close();
+
+  // We currently only call this at startup where we block the main thread
+  // preventing further operation until it completes, however take the lock
+  // in case that changes
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    // Copy data over to mData.
+    for (uint32_t i = 0; i < tmpData.Length(); ++i) {
+      // Older versions could sometimes write out empty, useless entries.
+      // Prune those here.
+      if (!ServiceWorkerRegistrationDataIsValid(tmpData[i])) {
+        continue;
+      }
+
+      bool match = false;
+      if (dedupe) {
+        MOZ_ASSERT(overwrite);
+        // If this is an old profile, then we might need to deduplicate.  In
+        // theory this can be removed in the future (Bug 1248449)
+        for (uint32_t j = 0; j < mData.Length(); ++j) {
+          // Use same comparison as RegisterServiceWorker. Scope contains
+          // basic origin information.  Combine with any principal attributes.
+          if (Equivalent(tmpData[i], mData[j])) {
+            // Last match wins, just like legacy loading used to do in
+            // the ServiceWorkerManager.
+            mData[j] = tmpData[i];
+            // Dupe found, so overwrite file with reduced list.
+            match = true;
+            break;
+          }
+        }
+      } else {
+#ifdef DEBUG
+        // Otherwise assert no duplications in debug builds.
+        for (uint32_t j = 0; j < mData.Length(); ++j) {
+          MOZ_ASSERT(!Equivalent(tmpData[i], mData[j]));
+        }
+#endif
+      }
+      if (!match) {
+        mData.AppendElement(tmpData[i]);
+      }
+    }
+  }
+  // Overwrite previous version.
+  // Cannot call SaveData directly because gtest uses main-thread.
+
+  // XXX NOTE: if we could be accessed multi-threaded here, we would need to
+  // find a way to lock around access to mData.  Since we can't, suppress the
+  // thread-safety warnings.
+  MOZ_PUSH_IGNORE_THREAD_SAFETY
+  if (overwrite && NS_FAILED(WriteData(mData))) {
+    NS_WARNING("Failed to write data for the ServiceWorker Registations.");
+    DeleteData();
+  }
+  MOZ_POP_THREAD_SAFETY
+
+  return NS_OK;
+}
+
+void ServiceWorkerRegistrar::DeleteData() {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    mData.Clear();
+
+    if (!mProfileDir) {
+      return;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  rv = file->Remove(false);
+  if (rv == NS_ERROR_FILE_NOT_FOUND) {
+    return;
+  }
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+}
+
+void ServiceWorkerRegistrar::RegisterServiceWorkerInternal(
+    const ServiceWorkerRegistrationData& aData) {
+  bool found = false;
+  for (uint32_t i = 0, len = mData.Length(); i < len; ++i) {
+    if (Equivalent(aData, mData[i])) {
+      found = true;
+      if (mData[i].currentWorkerHandlesFetch()) {
+        // Decrement here if we found it, in case the new registration no
+        // longer handles Fetch.  If it continues to handle fetch, we'll
+        // bump it back later.
+        gServiceWorkersRegisteredFetch--;
+      }
+      mData[i] = aData;
+      break;
+    }
+  }
+
+  if (!found) {
+    MOZ_ASSERT(ServiceWorkerRegistrationDataIsValid(aData));
+    mData.AppendElement(aData);
+    // We didn't find an entry to update, so we have 1 more
+    gServiceWorkersRegistered++;
+  }
+  // Handles bumping both for new registrations and updates
+  if (aData.currentWorkerHandlesFetch()) {
+    gServiceWorkersRegisteredFetch++;
+  }
+  // Update Telemetry
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"All"_ns, gServiceWorkersRegistered);
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"Fetch"_ns, gServiceWorkersRegisteredFetch);
+  LOG(("Register: %u, fetch %u\n", gServiceWorkersRegistered,
+       gServiceWorkersRegisteredFetch));
+
+  mDataGeneration = GetNextGeneration();
+}
+
+class ServiceWorkerRegistrarSaveDataRunnable final : public Runnable {
+  nsCOMPtr<nsIEventTarget> mEventTarget;
+  const nsTArray<ServiceWorkerRegistrationData> mData;
+  const uint32_t mGeneration;
+
+ public:
+  ServiceWorkerRegistrarSaveDataRunnable(
+      nsTArray<ServiceWorkerRegistrationData>&& aData, uint32_t aGeneration)
+      : Runnable("dom::ServiceWorkerRegistrarSaveDataRunnable"),
+        mEventTarget(GetCurrentSerialEventTarget()),
+        mData(std::move(aData)),
+        mGeneration(aGeneration) {
+    AssertIsOnBackgroundThread();
+    MOZ_DIAGNOSTIC_ASSERT(mGeneration != kInvalidGeneration);
+  }
+
+  NS_IMETHOD
+  Run() override {
+    RefPtr<ServiceWorkerRegistrar> service = ServiceWorkerRegistrar::Get();
+    MOZ_ASSERT(service);
+
+    uint32_t fileGeneration = kInvalidGeneration;
+
+    if (NS_SUCCEEDED(service->SaveData(mData))) {
+      fileGeneration = mGeneration;
+    }
+
+    RefPtr<Runnable> runnable = NewRunnableMethod<uint32_t>(
+        "ServiceWorkerRegistrar::DataSaved", service,
+        &ServiceWorkerRegistrar::DataSaved, fileGeneration);
+    MOZ_ALWAYS_SUCCEEDS(
+        mEventTarget->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL));
+
+    return NS_OK;
+  }
+};
+
+void ServiceWorkerRegistrar::MaybeScheduleSaveData() {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!mShuttingDown);
+
+  if (mShuttingDown || mSaveDataRunnableDispatched ||
+      mDataGeneration <= mFileGeneration) {
+    return;
+  }
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  uint32_t generation = kInvalidGeneration;
+  nsTArray<ServiceWorkerRegistrationData> data;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    generation = mDataGeneration;
+    data.AppendElements(mData);
+  }
+
+  RefPtr<Runnable> runnable =
+      new ServiceWorkerRegistrarSaveDataRunnable(std::move(data), generation);
+  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  mSaveDataRunnableDispatched = true;
+}
+
+void ServiceWorkerRegistrar::ShutdownCompleted() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  DebugOnly<nsresult> rv = GetShutdownPhase()->RemoveBlocker(this);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+nsresult ServiceWorkerRegistrar::SaveData(
+    const nsTArray<ServiceWorkerRegistrationData>& aData) {
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  nsresult rv = WriteData(aData);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to write data for the ServiceWorker Registations.");
+    // Don't touch the file or in-memory state.  Writing files can
+    // sometimes fail due to virus scanning, etc.  We should just leave
+    // things as is so the next save operation can pick up any changes
+    // without losing data.
+  }
+  return rv;
+}
+
+void ServiceWorkerRegistrar::DataSaved(uint32_t aFileGeneration) {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mSaveDataRunnableDispatched);
+
+  mSaveDataRunnableDispatched = false;
+
+  // Check for shutdown before possibly triggering any more saves
+  // runnables.
+  MaybeScheduleShutdownCompleted();
+  if (mShuttingDown) {
+    return;
+  }
+
+  // If we got a valid generation, then the save was successful.
+  if (aFileGeneration != kInvalidGeneration) {
+    // Update the file generation.  We also check to see if we
+    // can reset the generation back to zero if the file and data
+    // are now in sync.  This allows us to avoid dealing with wrap
+    // around of the generation count.
+    mFileGeneration = aFileGeneration;
+    MaybeResetGeneration();
+
+    // Successful write resets the retry count.
+    mRetryCount = 0;
+
+    // Possibly schedule another save operation if more data
+    // has come in while processing this one.
+    MaybeScheduleSaveData();
+
+    return;
+  }
+
+  // Otherwise, the save failed since the generation is invalid.  We
+  // want to retry the save, but only a limited number of times.
+  static const uint32_t kMaxRetryCount = 2;
+  if (mRetryCount >= kMaxRetryCount) {
+    return;
+  }
+
+  mRetryCount += 1;
+  MaybeScheduleSaveData();
+}
+
+void ServiceWorkerRegistrar::MaybeScheduleShutdownCompleted() {
+  AssertIsOnBackgroundThread();
+
+  if (mSaveDataRunnableDispatched || !mShuttingDown) {
+    return;
+  }
+
+  RefPtr<Runnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::ShutdownCompleted", this,
+                        &ServiceWorkerRegistrar::ShutdownCompleted);
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable.forget()));
+}
+
+uint32_t ServiceWorkerRegistrar::GetNextGeneration() {
+  uint32_t ret = mDataGeneration + 1;
+  if (ret == kInvalidGeneration) {
+    ret += 1;
+  }
+  return ret;
+}
+
+void ServiceWorkerRegistrar::MaybeResetGeneration() {
+  if (mDataGeneration != mFileGeneration) {
+    return;
+  }
+  mDataGeneration = mFileGeneration = 0;
+}
+
+bool ServiceWorkerRegistrar::IsSupportedVersion(
+    const nsACString& aVersion) const {
+  uint32_t numVersions = ArrayLength(gSupportedRegistrarVersions);
+  for (uint32_t i = 0; i < numVersions; i++) {
+    if (aVersion.EqualsASCII(gSupportedRegistrarVersions[i])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+nsresult ServiceWorkerRegistrar::WriteData(
+    const nsTArray<ServiceWorkerRegistrationData>& aData) {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+
+    if (!mProfileDir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIOutputStream> stream;
+  rv = NS_NewSafeLocalFileOutputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString buffer;
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_VERSION);
+  buffer.Append('\n');
+
+  uint32_t count;
+  rv = stream->Write(buffer.Data(), buffer.Length(), &count);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (count != buffer.Length()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  for (uint32_t i = 0, len = aData.Length(); i < len; ++i) {
+    // We have an assertion further up the stack, but as a last
+    // resort avoid writing out broken entries here.
+    if (!ServiceWorkerRegistrationDataIsValid(aData[i])) {
+      continue;
+    }
+
+    const mozilla::ipc::PrincipalInfo& info = aData[i].principal();
+
+    MOZ_ASSERT(info.type() ==
+               mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+
+    const mozilla::ipc::ContentPrincipalInfo& cInfo =
+        info.get_ContentPrincipalInfo();
+
+    nsAutoCString suffix;
+    cInfo.attrs().CreateSuffix(suffix);
+
+    buffer.Truncate();
+    buffer.Append(suffix.get());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].scope());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].currentWorkerURL());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].currentWorkerHandlesFetch()
+                      ? SERVICEWORKERREGISTRAR_TRUE
+                      : SERVICEWORKERREGISTRAR_FALSE);
+    buffer.Append('\n');
+
+    buffer.Append(NS_ConvertUTF16toUTF8(aData[i].cacheName()));
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].updateViaCache(), 16);
+    buffer.Append('\n');
+    MOZ_DIAGNOSTIC_ASSERT(
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS ||
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL ||
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE);
+
+    static_assert(nsIRequest::LOAD_NORMAL == 0,
+                  "LOAD_NORMAL matches serialized value.");
+    static_assert(nsIRequest::VALIDATE_ALWAYS == (1 << 11),
+                  "VALIDATE_ALWAYS matches serialized value");
+
+    buffer.AppendInt(aData[i].currentWorkerInstalledTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].currentWorkerActivatedTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].lastUpdateTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(
+        static_cast<int32_t>(aData[i].navigationPreloadState().enabled()));
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].navigationPreloadState().headerValue());
+    buffer.Append('\n');
+
+    buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR);
+    buffer.Append('\n');
+
+    rv = stream->Write(buffer.Data(), buffer.Length(), &count);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    if (count != buffer.Length()) {
+      return NS_ERROR_UNEXPECTED;
+    }
+  }
+
+  nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(stream);
+  MOZ_ASSERT(safeStream);
+
+  rv = safeStream->Finish();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+void ServiceWorkerRegistrar::ProfileStarted() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MonitorAutoLock lock(mMonitor);
+  MOZ_DIAGNOSTIC_ASSERT(!mProfileDir);
+
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(mProfileDir));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsAutoString blockerName;
+  MOZ_ALWAYS_SUCCEEDS(GetName(blockerName));
+
+  rv = GetShutdownPhase()->AddBlocker(
+      this, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__, blockerName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  nsCOMPtr<nsIRunnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::LoadData", this,
+                        &ServiceWorkerRegistrar::LoadData);
+  rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch the LoadDataRunnable.");
+  }
+}
+
+void ServiceWorkerRegistrar::ProfileStopped() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MonitorAutoLock lock(mMonitor);
+
+  if (!mProfileDir) {
+    nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                         getter_AddRefs(mProfileDir));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      // If we do not have a profile directory, we are somehow screwed.
+      MOZ_DIAGNOSTIC_ASSERT(
+          false,
+          "NS_GetSpecialDirectory for NS_APP_USER_PROFILE_50_DIR failed!");
+    }
+  }
+
+  // Mutations to the ServiceWorkerRegistrar happen on the PBackground thread,
+  // issued by the ServiceWorkerManagerService, so the appropriate place to
+  // trigger shutdown is on that thread.
+  //
+  // However, it's quite possible that the PBackground thread was not brought
+  // into existence for xpcshell tests.  We don't cause it to be created
+  // ourselves for any reason, for example.
+  //
+  // In this scenario, we know that:
+  // - We will receive exactly one call to ourself from BlockShutdown() and
+  //   BlockShutdown() will be called (at most) once.
+  // - The only way our Shutdown() method gets called is via
+  //   BackgroundParentImpl::RecvShutdownServiceWorkerRegistrar() being
+  //   invoked, which only happens if we get to that send below here that we
+  //   can't get to.
+  // - All Shutdown() does is set mShuttingDown=true (essential for
+  //   invariants) and invoke MaybeScheduleShutdownCompleted().
+  // - Since there is no PBackground thread, mSaveDataRunnableDispatched must
+  //   be false because only MaybeScheduleSaveData() set it and it only runs
+  //   on the background thread, so it cannot have run.  And so we would
+  //   expect MaybeScheduleShutdownCompleted() to schedule an invocation of
+  //   ShutdownCompleted on the main thread.
+  PBackgroundChild* child = BackgroundChild::GetForCurrentThread();
+  if (mProfileDir && child) {
+    if (child->SendShutdownServiceWorkerRegistrar()) {
+      // Normal shutdown sequence has been initiated, go home.
+      return;
+    }
+    // If we get here, the PBackground thread has probably gone nuts and we
+    // want to know it.
+    MOZ_DIAGNOSTIC_ASSERT(
+        false, "Unable to send the ShutdownServiceWorkerRegistrar message.");
+  }
+
+  // On any error it's appropriate to set mShuttingDown=true (as Shutdown
+  // would do) and directly invoke ShutdownCompleted() (as Shutdown would
+  // indirectly do via MaybeScheduleShutdownCompleted) in order to unblock
+  // shutdown.
+  mShuttingDown = true;
+  ShutdownCompleted();
+}
+
+// Async shutdown blocker methods
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::BlockShutdown(nsIAsyncShutdownClient* aClient) {
+  ProfileStopped();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::GetName(nsAString& aName) {
+  aName = u"ServiceWorkerRegistrar: Flushing data"_ns;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::GetState(nsIPropertyBag** aBagOut) {
+  nsCOMPtr<nsIWritablePropertyBag2> propertyBag =
+      do_CreateInstance("@mozilla.org/hash-property-bag;1");
+
+  MOZ_TRY(propertyBag->SetPropertyAsBool(u"shuttingDown"_ns, mShuttingDown));
+
+  MOZ_TRY(propertyBag->SetPropertyAsBool(u"saveDataRunnableDispatched"_ns,
+                                         mSaveDataRunnableDispatched));
+
+  propertyBag.forget(aBagOut);
+
+  return NS_OK;
+}
+
+#define RELEASE_ASSERT_SUCCEEDED(rv, name)                                    \
+  do {                                                                        \
+    if (NS_FAILED(rv)) {                                                      \
+      if ((rv) == NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS) {               \
+        if (auto* context = CycleCollectedJSContext::Get()) {                 \
+          if (RefPtr<Exception> exn = context->GetPendingException()) {       \
+            MOZ_CRASH_UNSAFE_PRINTF("Failed to get " name ": %s",             \
+                                    exn->GetMessageMoz().get());              \
+          }                                                                   \
+        }                                                                     \
+      }                                                                       \
+                                                                              \
+      nsAutoCString errorName;                                                \
+      GetErrorName(rv, errorName);                                            \
+      MOZ_CRASH_UNSAFE_PRINTF("Failed to get " name ": %s", errorName.get()); \
+    }                                                                         \
+  } while (0)
+
+nsCOMPtr<nsIAsyncShutdownClient> ServiceWorkerRegistrar::GetShutdownPhase()
+    const {
+  nsresult rv;
+  nsCOMPtr<nsIAsyncShutdownService> svc =
+      do_GetService("@mozilla.org/async-shutdown-service;1", &rv);
+  // If this fails, something is very wrong on the JS side (or we're out of
+  // memory), and there's no point in continuing startup. Include as much
+  // information as possible in the crash report.
+  RELEASE_ASSERT_SUCCEEDED(rv, "async shutdown service");
+
+  nsCOMPtr<nsIAsyncShutdownClient> client;
+  rv = svc->GetProfileBeforeChange(getter_AddRefs(client));
+  RELEASE_ASSERT_SUCCEEDED(rv, "profileBeforeChange shutdown blocker");
+  return client;
+}
+
+#undef RELEASE_ASSERT_SUCCEEDED
+
+void ServiceWorkerRegistrar::Shutdown() {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!mShuttingDown);
+
+  mShuttingDown = true;
+  MaybeScheduleShutdownCompleted();
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::Observe(nsISupports* aSubject, const char* aTopic,
+                                const char16_t* aData) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!strcmp(aTopic, "profile-after-change")) {
+    nsCOMPtr<nsIObserverService> observerService =
+        services::GetObserverService();
+    observerService->RemoveObserver(this, "profile-after-change");
+
+    // The profile is fully loaded, now we can proceed with the loading of data
+    // from disk.
+    ProfileStarted();
+
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(false, "ServiceWorkerRegistrar got unexpected topic!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrar.h b/dom/serviceworkers/ServiceWorkerRegistrar.h
new file mode 100644
index 0000000000..20c1cc530c
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrar.h
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerRegistrar_h
+#define mozilla_dom_ServiceWorkerRegistrar_h
+
+#include "mozilla/Monitor.h"
+#include "mozilla/Telemetry.h"
+#include "nsClassHashtable.h"
+#include "nsIAsyncShutdown.h"
+#include "nsIObserver.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+#define SERVICEWORKERREGISTRAR_FILE u"serviceworker.txt"
+#define SERVICEWORKERREGISTRAR_VERSION "9"
+#define SERVICEWORKERREGISTRAR_TERMINATOR "#"
+#define SERVICEWORKERREGISTRAR_TRUE "true"
+#define SERVICEWORKERREGISTRAR_FALSE "false"
+
+class nsIFile;
+
+namespace mozilla {
+
+namespace ipc {
+class PrincipalInfo;
+}  // namespace ipc
+
+namespace dom {
+
+class ServiceWorkerRegistrationData;
+}
+}  // namespace mozilla
+
+namespace mozilla::dom {
+
+class ServiceWorkerRegistrar : public nsIObserver,
+                               public nsIAsyncShutdownBlocker {
+  friend class ServiceWorkerRegistrarSaveDataRunnable;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+  NS_DECL_NSIASYNCSHUTDOWNBLOCKER
+
+  static void Initialize();
+
+  void Shutdown();
+
+  void DataSaved(uint32_t aFileGeneration);
+
+  static already_AddRefed<ServiceWorkerRegistrar> Get();
+
+  void GetRegistrations(nsTArray<ServiceWorkerRegistrationData>& aValues);
+
+  void RegisterServiceWorker(const ServiceWorkerRegistrationData& aData);
+  void UnregisterServiceWorker(
+      const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
+      const nsACString& aScope);
+  void RemoveAll();
+
+  bool ReloadDataForTest();
+
+ protected:
+  // These methods are protected because we test this class using gTest
+  // subclassing it.
+  void LoadData();
+  nsresult SaveData(const nsTArray<ServiceWorkerRegistrationData>& aData);
+
+  nsresult ReadData();
+  nsresult WriteData(const nsTArray<ServiceWorkerRegistrationData>& aData);
+  void DeleteData();
+
+  void RegisterServiceWorkerInternal(const ServiceWorkerRegistrationData& aData)
+      MOZ_REQUIRES(mMonitor);
+
+  ServiceWorkerRegistrar();
+  virtual ~ServiceWorkerRegistrar();
+
+ private:
+  void ProfileStarted();
+  void ProfileStopped();
+
+  void MaybeScheduleSaveData();
+  void ShutdownCompleted();
+  void MaybeScheduleShutdownCompleted();
+
+  uint32_t GetNextGeneration();
+  void MaybeResetGeneration();
+
+  nsCOMPtr<nsIAsyncShutdownClient> GetShutdownPhase() const;
+
+  bool IsSupportedVersion(const nsACString& aVersion) const;
+
+ protected:
+  mozilla::Monitor mMonitor;
+
+  // protected by mMonitor.
+  nsCOMPtr<nsIFile> mProfileDir MOZ_GUARDED_BY(mMonitor);
+  // Read on mainthread, modified on background thread EXCEPT for
+  // ReloadDataForTest() AND for gtest, which modifies this on MainThread.
+  nsTArray<ServiceWorkerRegistrationData> mData MOZ_GUARDED_BY(mMonitor);
+  bool mDataLoaded MOZ_GUARDED_BY(mMonitor);
+
+  // PBackground thread only
+  uint32_t mDataGeneration;
+  uint32_t mFileGeneration;
+  uint32_t mRetryCount;
+  bool mShuttingDown;
+  bool mSaveDataRunnableDispatched;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ServiceWorkerRegistrar_h
diff --git a/dom/serviceworkers/ServiceWorkerRegistrarTypes.ipdlh b/dom/serviceworkers/ServiceWorkerRegistrarTypes.ipdlh
new file mode 100644
index 0000000000..d84b324797
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrarTypes.ipdlh
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include IPCNavigationPreloadState;
+include PBackgroundSharedTypes;
+
+namespace mozilla {
+namespace dom {
+
+struct ServiceWorkerRegistrationData
+{
+  nsCString scope;
+  nsCString currentWorkerURL;
+  bool currentWorkerHandlesFetch;
+
+  nsString cacheName;
+
+  PrincipalInfo principal;
+
+  uint16_t updateViaCache;
+
+  int64_t currentWorkerInstalledTime;
+  int64_t currentWorkerActivatedTime;
+  int64_t lastUpdateTime;
+
+  IPCNavigationPreloadState navigationPreloadState;
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/serviceworkers/ServiceWorkerRegistration.cpp b/dom/serviceworkers/ServiceWorkerRegistration.cpp
new file mode 100644
index 0000000000..b54dfc7cbd
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistration.cpp
@@ -0,0 +1,695 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistration.h"
+
+#include "mozilla/dom/DOMMozPromiseRequestHolder.h"
+#include "mozilla/dom/NavigationPreloadManager.h"
+#include "mozilla/dom/NavigationPreloadManagerBinding.h"
+#include "mozilla/dom/Notification.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/PushManager.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "mozilla/dom/ServiceWorker.h"
+#include "mozilla/dom/ServiceWorkerRegistrationBinding.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ScopeExit.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsPIDOMWindow.h"
+#include "ServiceWorkerRegistrationChild.h"
+
+using mozilla::ipc::ResponseRejectReason;
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ServiceWorkerRegistration,
+                                   DOMEventTargetHelper, mInstallingWorker,
+                                   mWaitingWorker, mActiveWorker,
+                                   mNavigationPreloadManager, mPushManager);
+
+NS_IMPL_ADDREF_INHERITED(ServiceWorkerRegistration, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(ServiceWorkerRegistration, DOMEventTargetHelper)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServiceWorkerRegistration)
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(ServiceWorkerRegistration)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+namespace {
+const uint64_t kInvalidUpdateFoundId = 0;
+}  // anonymous namespace
+
+ServiceWorkerRegistration::ServiceWorkerRegistration(
+    nsIGlobalObject* aGlobal,
+    const ServiceWorkerRegistrationDescriptor& aDescriptor)
+    : DOMEventTargetHelper(aGlobal),
+      mDescriptor(aDescriptor),
+      mShutdown(false),
+      mScheduledUpdateFoundId(kInvalidUpdateFoundId),
+      mDispatchedUpdateFoundId(kInvalidUpdateFoundId) {
+  ::mozilla::ipc::PBackgroundChild* parentActor =
+      ::mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread();
+  if (NS_WARN_IF(!parentActor)) {
+    Shutdown();
+    return;
+  }
+
+  auto actor = ServiceWorkerRegistrationChild::Create();
+  if (NS_WARN_IF(!actor)) {
+    Shutdown();
+    return;
+  }
+
+  PServiceWorkerRegistrationChild* sentActor =
+      parentActor->SendPServiceWorkerRegistrationConstructor(
+          actor, aDescriptor.ToIPC());
+  if (NS_WARN_IF(!sentActor)) {
+    Shutdown();
+    return;
+  }
+  MOZ_DIAGNOSTIC_ASSERT(sentActor == actor);
+
+  mActor = std::move(actor);
+  mActor->SetOwner(this);
+
+  KeepAliveIfHasListenersFor(nsGkAtoms::onupdatefound);
+}
+
+ServiceWorkerRegistration::~ServiceWorkerRegistration() { Shutdown(); }
+
+JSObject* ServiceWorkerRegistration::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return ServiceWorkerRegistration_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */
+already_AddRefed<ServiceWorkerRegistration>
+ServiceWorkerRegistration::CreateForMainThread(
+    nsPIDOMWindowInner* aWindow,
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  MOZ_ASSERT(aWindow);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerRegistration> registration =
+      new ServiceWorkerRegistration(aWindow->AsGlobal(), aDescriptor);
+  // This is not called from within the constructor, as it may call content code
+  // which can cause the deletion of the registration, so we need to keep a
+  // strong reference while calling it.
+  registration->UpdateState(aDescriptor);
+
+  return registration.forget();
+}
+
+/* static */
+already_AddRefed<ServiceWorkerRegistration>
+ServiceWorkerRegistration::CreateForWorker(
+    WorkerPrivate* aWorkerPrivate, nsIGlobalObject* aGlobal,
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  MOZ_DIAGNOSTIC_ASSERT(aWorkerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(aGlobal);
+  aWorkerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<ServiceWorkerRegistration> registration =
+      new ServiceWorkerRegistration(aGlobal, aDescriptor);
+  // This is not called from within the constructor, as it may call content code
+  // which can cause the deletion of the registration, so we need to keep a
+  // strong reference while calling it.
+  registration->UpdateState(aDescriptor);
+
+  return registration.forget();
+}
+
+void ServiceWorkerRegistration::DisconnectFromOwner() {
+  DOMEventTargetHelper::DisconnectFromOwner();
+}
+
+void ServiceWorkerRegistration::RegistrationCleared() {
+  // Its possible that the registration will fail to install and be
+  // immediately removed.  In that case we may never receive the
+  // UpdateState() call if the actor was too slow to connect, etc.
+  // Ensure that we force all our known actors to redundant so that
+  // the appropriate statechange events are fired.  If we got the
+  // UpdateState() already then this will be a no-op.
+  UpdateStateInternal(Maybe<ServiceWorkerDescriptor>(),
+                      Maybe<ServiceWorkerDescriptor>(),
+                      Maybe<ServiceWorkerDescriptor>());
+
+  // Our underlying registration was removed from SWM, so we
+  // will never get an updatefound event again.  We can let
+  // the object GC if content is not holding it alive.
+  IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onupdatefound);
+}
+
+already_AddRefed<ServiceWorker> ServiceWorkerRegistration::GetInstalling()
+    const {
+  RefPtr<ServiceWorker> ref = mInstallingWorker;
+  return ref.forget();
+}
+
+already_AddRefed<ServiceWorker> ServiceWorkerRegistration::GetWaiting() const {
+  RefPtr<ServiceWorker> ref = mWaitingWorker;
+  return ref.forget();
+}
+
+already_AddRefed<ServiceWorker> ServiceWorkerRegistration::GetActive() const {
+  RefPtr<ServiceWorker> ref = mActiveWorker;
+  return ref.forget();
+}
+
+already_AddRefed<NavigationPreloadManager>
+ServiceWorkerRegistration::NavigationPreload() {
+  RefPtr<ServiceWorkerRegistration> reg = this;
+  if (!mNavigationPreloadManager) {
+    mNavigationPreloadManager = MakeRefPtr<NavigationPreloadManager>(reg);
+  }
+  RefPtr<NavigationPreloadManager> ref = mNavigationPreloadManager;
+  return ref.forget();
+}
+
+void ServiceWorkerRegistration::UpdateState(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  MOZ_DIAGNOSTIC_ASSERT(MatchesDescriptor(aDescriptor));
+
+  mDescriptor = aDescriptor;
+
+  UpdateStateInternal(aDescriptor.GetInstalling(), aDescriptor.GetWaiting(),
+                      aDescriptor.GetActive());
+
+  nsTArray<UniquePtr<VersionCallback>> callbackList =
+      std::move(mVersionCallbackList);
+  for (auto& cb : callbackList) {
+    if (cb->mVersion > mDescriptor.Version()) {
+      mVersionCallbackList.AppendElement(std::move(cb));
+      continue;
+    }
+
+    cb->mFunc(cb->mVersion == mDescriptor.Version());
+  }
+}
+
+bool ServiceWorkerRegistration::MatchesDescriptor(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) const {
+  return aDescriptor.Id() == mDescriptor.Id() &&
+         aDescriptor.PrincipalInfo() == mDescriptor.PrincipalInfo() &&
+         aDescriptor.Scope() == mDescriptor.Scope();
+}
+
+void ServiceWorkerRegistration::GetScope(nsAString& aScope) const {
+  CopyUTF8toUTF16(mDescriptor.Scope(), aScope);
+}
+
+ServiceWorkerUpdateViaCache ServiceWorkerRegistration::GetUpdateViaCache(
+    ErrorResult& aRv) const {
+  return mDescriptor.UpdateViaCache();
+}
+
+already_AddRefed<Promise> ServiceWorkerRegistration::Update(ErrorResult& aRv) {
+  nsIGlobalObject* global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  RefPtr<Promise> outer = Promise::Create(global, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  // `ServiceWorker` objects are not exposed on worker threads yet, so calling
+  // `ServiceWorkerRegistration::Get{Installing,Waiting,Active}` won't work.
+  const Maybe<ServiceWorkerDescriptor> newestWorkerDescriptor =
+      mDescriptor.Newest();
+
+  // "If newestWorker is null, return a promise rejected with an
+  // "InvalidStateError" DOMException and abort these steps."
+  if (newestWorkerDescriptor.isNothing()) {
+    outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return outer.forget();
+  }
+
+  // "If the context object’s relevant settings object’s global object
+  // globalObject is a ServiceWorkerGlobalScope object, and globalObject’s
+  // associated service worker's state is "installing", return a promise
+  // rejected with an "InvalidStateError" DOMException and abort these steps."
+  if (!NS_IsMainThread()) {
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(workerPrivate);
+
+    if (workerPrivate->IsServiceWorker() &&
+        (workerPrivate->GetServiceWorkerDescriptor().State() ==
+         ServiceWorkerState::Installing)) {
+      outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      return outer.forget();
+    }
+  }
+
+  RefPtr<ServiceWorkerRegistration> self = this;
+
+  if (!mActor) {
+    outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return outer.forget();
+  }
+
+  mActor->SendUpdate(
+      newestWorkerDescriptor.ref().ScriptURL(),
+      [outer,
+       self](const IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult&
+                 aResult) {
+        if (aResult.type() ==
+            IPCServiceWorkerRegistrationDescriptorOrCopyableErrorResult::
+                TCopyableErrorResult) {
+          // application layer error
+          const auto& rv = aResult.get_CopyableErrorResult();
+          MOZ_DIAGNOSTIC_ASSERT(rv.Failed());
+          outer->MaybeReject(CopyableErrorResult(rv));
+          return;
+        }
+        // success
+        const auto& ipcDesc =
+            aResult.get_IPCServiceWorkerRegistrationDescriptor();
+        nsIGlobalObject* global = self->GetParentObject();
+        // It's possible this binding was detached from the global.  In cases
+        // where we use IPC with Promise callbacks, we use
+        // DOMMozPromiseRequestHolder in order to auto-disconnect the promise
+        // that would hold these callbacks.  However in bug 1466681 we changed
+        // this call to use (synchronous) callbacks because the use of
+        // MozPromise introduced an additional runnable scheduling which made
+        // it very difficult to maintain ordering required by the standard.
+        //
+        // If we were to delete this actor at the time of DETH detaching, we
+        // would not need to do this check because the IPC callback of the
+        // RemoteServiceWorkerRegistrationImpl lambdas would never occur.
+        // However, its actors currently depend on asking the parent to delete
+        // the actor for us.  Given relaxations in the IPC lifecyle, we could
+        // potentially issue a direct termination, but that requires additional
+        // evaluation.
+        if (!global) {
+          outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+          return;
+        }
+        RefPtr<ServiceWorkerRegistration> ref =
+            global->GetOrCreateServiceWorkerRegistration(
+                ServiceWorkerRegistrationDescriptor(ipcDesc));
+        if (!ref) {
+          outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+          return;
+        }
+        outer->MaybeResolve(ref);
+      },
+      [outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        outer->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
+      });
+
+  return outer.forget();
+}
+
+already_AddRefed<Promise> ServiceWorkerRegistration::Unregister(
+    ErrorResult& aRv) {
+  nsIGlobalObject* global = GetParentObject();
+  if (NS_WARN_IF(!global)) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  RefPtr<Promise> outer = Promise::Create(global, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  if (!mActor) {
+    outer->MaybeResolve(false);
+    return outer.forget();
+  }
+
+  mActor->SendUnregister(
+      [outer](std::tuple<bool, CopyableErrorResult>&& aResult) {
+        if (std::get<1>(aResult).Failed()) {
+          // application layer error
+          // register() should be resilient and resolve false instead of
+          // rejecting in most cases.
+          std::get<1>(aResult).SuppressException();
+          outer->MaybeResolve(false);
+          return;
+        }
+        // success
+        outer->MaybeResolve(std::get<0>(aResult));
+      },
+      [outer](ResponseRejectReason&& aReason) {
+        // IPC layer error
+        outer->MaybeResolve(false);
+      });
+
+  return outer.forget();
+}
+
+already_AddRefed<PushManager> ServiceWorkerRegistration::GetPushManager(
+    JSContext* aCx, ErrorResult& aRv) {
+  if (!mPushManager) {
+    nsCOMPtr<nsIGlobalObject> globalObject = GetParentObject();
+
+    if (!globalObject) {
+      aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+      return nullptr;
+    }
+
+    GlobalObject global(aCx, globalObject->GetGlobalJSObject());
+    mPushManager = PushManager::Constructor(
+        global, NS_ConvertUTF8toUTF16(mDescriptor.Scope()), aRv);
+    if (aRv.Failed()) {
+      return nullptr;
+    }
+  }
+
+  RefPtr<PushManager> ret = mPushManager;
+  return ret.forget();
+}
+
+// https://notifications.spec.whatwg.org/#dom-serviceworkerregistration-shownotification
+already_AddRefed<Promise> ServiceWorkerRegistration::ShowNotification(
+    JSContext* aCx, const nsAString& aTitle,
+    const NotificationOptions& aOptions, ErrorResult& aRv) {
+  // Step 1: Let global be this’s relevant global object.
+  nsIGlobalObject* global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  // Step 3: If this’s active worker is null, then reject promise with a
+  // TypeError and return promise.
+  //
+  // Until we ship ServiceWorker objects on worker threads the active
+  // worker will always be nullptr.  So limit this check to main
+  // thread for now.
+  if (mDescriptor.GetActive().isNothing() && NS_IsMainThread()) {
+    aRv.ThrowTypeError<MSG_NO_ACTIVE_WORKER>(mDescriptor.Scope());
+    return nullptr;
+  }
+
+  NS_ConvertUTF8toUTF16 scope(mDescriptor.Scope());
+
+  // Step 2, 5, 6
+  RefPtr<Promise> p = Notification::ShowPersistentNotification(
+      aCx, global, scope, aTitle, aOptions, mDescriptor, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  // Step 7: Return promise.
+  return p.forget();
+}
+
+already_AddRefed<Promise> ServiceWorkerRegistration::GetNotifications(
+    const GetNotificationOptions& aOptions, ErrorResult& aRv) {
+  nsIGlobalObject* global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  NS_ConvertUTF8toUTF16 scope(mDescriptor.Scope());
+
+  if (NS_IsMainThread()) {
+    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global);
+    if (NS_WARN_IF(!window)) {
+      aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+      return nullptr;
+    }
+    return Notification::Get(window, aOptions, scope, aRv);
+  }
+
+  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+  worker->AssertIsOnWorkerThread();
+  return Notification::WorkerGet(worker, aOptions, scope, aRv);
+}
+
+void ServiceWorkerRegistration::SetNavigationPreloadEnabled(
+    bool aEnabled, ServiceWorkerBoolCallback&& aSuccessCB,
+    ServiceWorkerFailureCallback&& aFailureCB) {
+  if (!mActor) {
+    aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return;
+  }
+
+  mActor->SendSetNavigationPreloadEnabled(
+      aEnabled,
+      [successCB = std::move(aSuccessCB), aFailureCB](bool aResult) {
+        if (!aResult) {
+          aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+          return;
+        }
+        successCB(aResult);
+      },
+      [aFailureCB](ResponseRejectReason&& aReason) {
+        aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+      });
+}
+
+void ServiceWorkerRegistration::SetNavigationPreloadHeader(
+    const nsCString& aHeader, ServiceWorkerBoolCallback&& aSuccessCB,
+    ServiceWorkerFailureCallback&& aFailureCB) {
+  if (!mActor) {
+    aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return;
+  }
+
+  mActor->SendSetNavigationPreloadHeader(
+      aHeader,
+      [successCB = std::move(aSuccessCB), aFailureCB](bool aResult) {
+        if (!aResult) {
+          aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+          return;
+        }
+        successCB(aResult);
+      },
+      [aFailureCB](ResponseRejectReason&& aReason) {
+        aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+      });
+}
+
+void ServiceWorkerRegistration::GetNavigationPreloadState(
+    NavigationPreloadGetStateCallback&& aSuccessCB,
+    ServiceWorkerFailureCallback&& aFailureCB) {
+  if (!mActor) {
+    aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return;
+  }
+
+  mActor->SendGetNavigationPreloadState(
+      [successCB = std::move(aSuccessCB),
+       aFailureCB](Maybe<IPCNavigationPreloadState>&& aState) {
+        if (NS_WARN_IF(!aState)) {
+          aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+          return;
+        }
+
+        NavigationPreloadState state;
+        state.mEnabled = aState.ref().enabled();
+        state.mHeaderValue.Construct(std::move(aState.ref().headerValue()));
+        successCB(std::move(state));
+      },
+      [aFailureCB](ResponseRejectReason&& aReason) {
+        aFailureCB(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+      });
+}
+
+const ServiceWorkerRegistrationDescriptor&
+ServiceWorkerRegistration::Descriptor() const {
+  return mDescriptor;
+}
+
+void ServiceWorkerRegistration::WhenVersionReached(
+    uint64_t aVersion, ServiceWorkerBoolCallback&& aCallback) {
+  if (aVersion <= mDescriptor.Version()) {
+    aCallback(aVersion == mDescriptor.Version());
+    return;
+  }
+
+  mVersionCallbackList.AppendElement(
+      MakeUnique<VersionCallback>(aVersion, std::move(aCallback)));
+}
+
+void ServiceWorkerRegistration::MaybeScheduleUpdateFound(
+    const Maybe<ServiceWorkerDescriptor>& aInstallingDescriptor) {
+  // This function sets mScheduledUpdateFoundId to note when we were told about
+  // a new installing worker. We rely on a call to
+  // MaybeDispatchUpdateFoundRunnable (called indirectly from UpdateJobCallback)
+  // to actually fire the event.
+  uint64_t newId = aInstallingDescriptor.isSome()
+                       ? aInstallingDescriptor.ref().Id()
+                       : kInvalidUpdateFoundId;
+
+  if (mScheduledUpdateFoundId != kInvalidUpdateFoundId) {
+    if (mScheduledUpdateFoundId == newId) {
+      return;
+    }
+    MaybeDispatchUpdateFound();
+    MOZ_DIAGNOSTIC_ASSERT(mScheduledUpdateFoundId == kInvalidUpdateFoundId);
+  }
+
+  bool updateFound =
+      newId != kInvalidUpdateFoundId && mDispatchedUpdateFoundId != newId;
+
+  if (!updateFound) {
+    return;
+  }
+
+  mScheduledUpdateFoundId = newId;
+}
+
+void ServiceWorkerRegistration::MaybeDispatchUpdateFoundRunnable() {
+  if (mScheduledUpdateFoundId == kInvalidUpdateFoundId) {
+    return;
+  }
+
+  nsIGlobalObject* global = GetParentObject();
+  NS_ENSURE_TRUE_VOID(global);
+
+  nsCOMPtr<nsIRunnable> r = NewCancelableRunnableMethod(
+      "ServiceWorkerRegistration::MaybeDispatchUpdateFound", this,
+      &ServiceWorkerRegistration::MaybeDispatchUpdateFound);
+
+  Unused << global->SerialEventTarget()->Dispatch(r.forget(),
+                                                  NS_DISPATCH_NORMAL);
+}
+
+void ServiceWorkerRegistration::MaybeDispatchUpdateFound() {
+  uint64_t scheduledId = mScheduledUpdateFoundId;
+  mScheduledUpdateFoundId = kInvalidUpdateFoundId;
+
+  if (scheduledId == kInvalidUpdateFoundId ||
+      scheduledId == mDispatchedUpdateFoundId) {
+    return;
+  }
+
+  mDispatchedUpdateFoundId = scheduledId;
+  DispatchTrustedEvent(u"updatefound"_ns);
+}
+
+void ServiceWorkerRegistration::UpdateStateInternal(
+    const Maybe<ServiceWorkerDescriptor>& aInstalling,
+    const Maybe<ServiceWorkerDescriptor>& aWaiting,
+    const Maybe<ServiceWorkerDescriptor>& aActive) {
+  // Do this immediately as it may flush an already pending updatefound
+  // event.  In that case we want to fire the pending event before
+  // modifying any of the registration properties.
+  MaybeScheduleUpdateFound(aInstalling);
+
+  // Move the currently exposed workers into a separate list
+  // of "old" workers.  We will then potentially add them
+  // back to the registration properties below based on the
+  // given descriptor.  Any that are not restored will need
+  // to be moved to the redundant state.
+  AutoTArray<RefPtr<ServiceWorker>, 3> oldWorkerList({
+      std::move(mInstallingWorker),
+      std::move(mWaitingWorker),
+      std::move(mActiveWorker),
+  });
+
+  // Its important that all state changes are actually applied before
+  // dispatching any statechange events.  Each ServiceWorker object
+  // should be in the correct state and the ServiceWorkerRegistration
+  // properties need to be set correctly as well.  To accomplish this
+  // we use a ScopeExit to dispatch any statechange events.
+  auto scopeExit = MakeScopeExit([&] {
+    // Check to see if any of the "old" workers was completely discarded.
+    // Set these workers to the redundant state.
+    for (auto& oldWorker : oldWorkerList) {
+      if (!oldWorker || oldWorker == mInstallingWorker ||
+          oldWorker == mWaitingWorker || oldWorker == mActiveWorker) {
+        continue;
+      }
+
+      oldWorker->SetState(ServiceWorkerState::Redundant);
+    }
+
+    // Check each worker to see if it needs a statechange event dispatched.
+    if (mInstallingWorker) {
+      mInstallingWorker->MaybeDispatchStateChangeEvent();
+    }
+    if (mWaitingWorker) {
+      mWaitingWorker->MaybeDispatchStateChangeEvent();
+    }
+    if (mActiveWorker) {
+      mActiveWorker->MaybeDispatchStateChangeEvent();
+    }
+
+    // We also check the "old" workers to see if they need a statechange
+    // event as well.  Note, these may overlap with the known worker properties
+    // above, but MaybeDispatchStateChangeEvent() will ignore duplicated calls.
+    for (auto& oldWorker : oldWorkerList) {
+      if (!oldWorker) {
+        continue;
+      }
+
+      oldWorker->MaybeDispatchStateChangeEvent();
+    }
+  });
+
+  // Clear all workers if the registration has been detached from the global.
+  // Also, we cannot expose ServiceWorker objects on worker threads yet, so
+  // do the same on when off-main-thread.  This main thread check should be
+  // removed as part of bug 1113522.
+  nsCOMPtr<nsIGlobalObject> global = GetParentObject();
+  if (!global || !NS_IsMainThread()) {
+    return;
+  }
+
+  if (aActive.isSome()) {
+    if ((mActiveWorker = global->GetOrCreateServiceWorker(aActive.ref()))) {
+      mActiveWorker->SetState(aActive.ref().State());
+    }
+  } else {
+    mActiveWorker = nullptr;
+  }
+
+  if (aWaiting.isSome()) {
+    if ((mWaitingWorker = global->GetOrCreateServiceWorker(aWaiting.ref()))) {
+      mWaitingWorker->SetState(aWaiting.ref().State());
+    }
+  } else {
+    mWaitingWorker = nullptr;
+  }
+
+  if (aInstalling.isSome()) {
+    if ((mInstallingWorker =
+             global->GetOrCreateServiceWorker(aInstalling.ref()))) {
+      mInstallingWorker->SetState(aInstalling.ref().State());
+    }
+  } else {
+    mInstallingWorker = nullptr;
+  }
+}
+
+void ServiceWorkerRegistration::RevokeActor(
+    ServiceWorkerRegistrationChild* aActor) {
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor->RevokeOwner(this);
+  mActor = nullptr;
+
+  mShutdown = true;
+
+  RegistrationCleared();
+}
+
+void ServiceWorkerRegistration::Shutdown() {
+  if (mShutdown) {
+    return;
+  }
+  mShutdown = true;
+
+  if (mActor) {
+    mActor->RevokeOwner(this);
+    mActor->MaybeStartTeardown();
+    mActor = nullptr;
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistration.h b/dom/serviceworkers/ServiceWorkerRegistration.h
new file mode 100644
index 0000000000..fa638d37b6
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistration.h
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerRegistration_h
+#define mozilla_dom_ServiceWorkerRegistration_h
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/dom/ServiceWorkerBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrationBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrationDescriptor.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+
+// Support for Notification API extension.
+#include "mozilla/dom/NotificationBinding.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+class NavigationPreloadManager;
+class Promise;
+class PushManager;
+class WorkerPrivate;
+class ServiceWorker;
+class ServiceWorkerRegistrationChild;
+
+#define NS_DOM_SERVICEWORKERREGISTRATION_IID         \
+  {                                                  \
+    0x4578a90e, 0xa427, 0x4237, {                    \
+      0x98, 0x4a, 0xbd, 0x98, 0xe4, 0xcd, 0x5f, 0x3a \
+    }                                                \
+  }
+
+class ServiceWorkerRegistration final : public DOMEventTargetHelper {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOM_SERVICEWORKERREGISTRATION_IID)
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ServiceWorkerRegistration,
+                                           DOMEventTargetHelper)
+
+  IMPL_EVENT_HANDLER(updatefound)
+
+  static already_AddRefed<ServiceWorkerRegistration> CreateForMainThread(
+      nsPIDOMWindowInner* aWindow,
+      const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  static already_AddRefed<ServiceWorkerRegistration> CreateForWorker(
+      WorkerPrivate* aWorkerPrivate, nsIGlobalObject* aGlobal,
+      const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  void DisconnectFromOwner() override;
+
+  void RegistrationCleared();
+
+  already_AddRefed<ServiceWorker> GetInstalling() const;
+
+  already_AddRefed<ServiceWorker> GetWaiting() const;
+
+  already_AddRefed<ServiceWorker> GetActive() const;
+
+  already_AddRefed<NavigationPreloadManager> NavigationPreload();
+
+  void UpdateState(const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  bool MatchesDescriptor(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor) const;
+
+  void GetScope(nsAString& aScope) const;
+
+  ServiceWorkerUpdateViaCache GetUpdateViaCache(ErrorResult& aRv) const;
+
+  already_AddRefed<Promise> Update(ErrorResult& aRv);
+
+  already_AddRefed<Promise> Unregister(ErrorResult& aRv);
+
+  already_AddRefed<PushManager> GetPushManager(JSContext* aCx,
+                                               ErrorResult& aRv);
+
+  already_AddRefed<Promise> ShowNotification(
+      JSContext* aCx, const nsAString& aTitle,
+      const NotificationOptions& aOptions, ErrorResult& aRv);
+
+  already_AddRefed<Promise> GetNotifications(
+      const GetNotificationOptions& aOptions, ErrorResult& aRv);
+
+  void SetNavigationPreloadEnabled(bool aEnabled,
+                                   ServiceWorkerBoolCallback&& aSuccessCB,
+                                   ServiceWorkerFailureCallback&& aFailureCB);
+
+  void SetNavigationPreloadHeader(const nsCString& aHeader,
+                                  ServiceWorkerBoolCallback&& aSuccessCB,
+                                  ServiceWorkerFailureCallback&& aFailureCB);
+
+  void GetNavigationPreloadState(NavigationPreloadGetStateCallback&& aSuccessCB,
+                                 ServiceWorkerFailureCallback&& aFailureCB);
+
+  const ServiceWorkerRegistrationDescriptor& Descriptor() const;
+
+  void WhenVersionReached(uint64_t aVersion,
+                          ServiceWorkerBoolCallback&& aCallback);
+
+  void MaybeDispatchUpdateFoundRunnable();
+
+  void RevokeActor(ServiceWorkerRegistrationChild* aActor);
+
+  void FireUpdateFound();
+
+ private:
+  ServiceWorkerRegistration(
+      nsIGlobalObject* aGlobal,
+      const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  ~ServiceWorkerRegistration();
+
+  void UpdateStateInternal(const Maybe<ServiceWorkerDescriptor>& aInstalling,
+                           const Maybe<ServiceWorkerDescriptor>& aWaiting,
+                           const Maybe<ServiceWorkerDescriptor>& aActive);
+
+  void MaybeScheduleUpdateFound(
+      const Maybe<ServiceWorkerDescriptor>& aInstallingDescriptor);
+
+  void MaybeDispatchUpdateFound();
+
+  void Shutdown();
+
+  ServiceWorkerRegistrationDescriptor mDescriptor;
+  RefPtr<ServiceWorkerRegistrationChild> mActor;
+  bool mShutdown;
+
+  RefPtr<ServiceWorker> mInstallingWorker;
+  RefPtr<ServiceWorker> mWaitingWorker;
+  RefPtr<ServiceWorker> mActiveWorker;
+  RefPtr<NavigationPreloadManager> mNavigationPreloadManager;
+  RefPtr<PushManager> mPushManager;
+
+  struct VersionCallback {
+    uint64_t mVersion;
+    ServiceWorkerBoolCallback mFunc;
+
+    VersionCallback(uint64_t aVersion, ServiceWorkerBoolCallback&& aFunc)
+        : mVersion(aVersion), mFunc(std::move(aFunc)) {
+      MOZ_DIAGNOSTIC_ASSERT(mFunc);
+    }
+  };
+  nsTArray<UniquePtr<VersionCallback>> mVersionCallbackList;
+
+  uint64_t mScheduledUpdateFoundId;
+  uint64_t mDispatchedUpdateFoundId;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(ServiceWorkerRegistration,
+                              NS_DOM_SERVICEWORKERREGISTRATION_IID)
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_ServiceWorkerRegistration_h */
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationChild.cpp b/dom/serviceworkers/ServiceWorkerRegistrationChild.cpp
new file mode 100644
index 0000000000..b382f6dcfa
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationChild.cpp
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistrationChild.h"
+
+#include "ServiceWorkerRegistration.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::IPCResult;
+
+void ServiceWorkerRegistrationChild::ActorDestroy(ActorDestroyReason aReason) {
+  mIPCWorkerRef = nullptr;
+
+  if (mOwner) {
+    mOwner->RevokeActor(this);
+    MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  }
+}
+
+IPCResult ServiceWorkerRegistrationChild::RecvUpdateState(
+    const IPCServiceWorkerRegistrationDescriptor& aDescriptor) {
+  if (mOwner) {
+    RefPtr<ServiceWorkerRegistration> owner = mOwner;
+    owner->UpdateState(ServiceWorkerRegistrationDescriptor(aDescriptor));
+  }
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerRegistrationChild::RecvFireUpdateFound() {
+  if (mOwner) {
+    mOwner->MaybeDispatchUpdateFoundRunnable();
+  }
+  return IPC_OK();
+}
+
+// static
+RefPtr<ServiceWorkerRegistrationChild>
+ServiceWorkerRegistrationChild::Create() {
+  RefPtr actor = new ServiceWorkerRegistrationChild;
+
+  if (!NS_IsMainThread()) {
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+
+    RefPtr<IPCWorkerRefHelper<ServiceWorkerRegistrationChild>> helper =
+        new IPCWorkerRefHelper<ServiceWorkerRegistrationChild>(actor);
+
+    actor->mIPCWorkerRef = IPCWorkerRef::Create(
+        workerPrivate, "ServiceWorkerRegistrationChild",
+        [helper] { helper->Actor()->MaybeStartTeardown(); });
+
+    if (NS_WARN_IF(!actor->mIPCWorkerRef)) {
+      return nullptr;
+    }
+  }
+
+  return actor;
+}
+
+ServiceWorkerRegistrationChild::ServiceWorkerRegistrationChild()
+    : mOwner(nullptr), mTeardownStarted(false) {}
+
+void ServiceWorkerRegistrationChild::SetOwner(
+    ServiceWorkerRegistration* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(!mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner);
+  mOwner = aOwner;
+}
+
+void ServiceWorkerRegistrationChild::RevokeOwner(
+    ServiceWorkerRegistration* aOwner) {
+  MOZ_DIAGNOSTIC_ASSERT(mOwner);
+  MOZ_DIAGNOSTIC_ASSERT(aOwner == mOwner);
+  mOwner = nullptr;
+}
+
+void ServiceWorkerRegistrationChild::MaybeStartTeardown() {
+  if (mTeardownStarted) {
+    return;
+  }
+  mTeardownStarted = true;
+  Unused << SendTeardown();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationChild.h b/dom/serviceworkers/ServiceWorkerRegistrationChild.h
new file mode 100644
index 0000000000..a26dfd6de9
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationChild.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerregistrationchild_h__
+#define mozilla_dom_serviceworkerregistrationchild_h__
+
+#include "mozilla/dom/PServiceWorkerRegistrationChild.h"
+
+// XXX Avoid including this here by moving function bodies to the cpp file
+#include "mozilla/dom/WorkerRef.h"
+
+namespace mozilla::dom {
+
+class IPCWorkerRef;
+class ServiceWorkerRegistration;
+
+class ServiceWorkerRegistrationChild final
+    : public PServiceWorkerRegistrationChild {
+  RefPtr<IPCWorkerRef> mIPCWorkerRef;
+  ServiceWorkerRegistration* mOwner;
+  bool mTeardownStarted;
+
+  ServiceWorkerRegistrationChild();
+
+  ~ServiceWorkerRegistrationChild() = default;
+
+  // PServiceWorkerRegistrationChild
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+  mozilla::ipc::IPCResult RecvUpdateState(
+      const IPCServiceWorkerRegistrationDescriptor& aDescriptor) override;
+
+  mozilla::ipc::IPCResult RecvFireUpdateFound() override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerRegistrationChild, override);
+
+  static RefPtr<ServiceWorkerRegistrationChild> Create();
+
+  void SetOwner(ServiceWorkerRegistration* aOwner);
+
+  void RevokeOwner(ServiceWorkerRegistration* aOwner);
+
+  void MaybeStartTeardown();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerregistrationchild_h__
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.cpp b/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.cpp
new file mode 100644
index 0000000000..1988df8c4a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.cpp
@@ -0,0 +1,274 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/ServiceWorkerRegistrationDescriptor.h"
+
+#include "mozilla/dom/IPCServiceWorkerRegistrationDescriptor.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "ServiceWorkerInfo.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::PrincipalInfo;
+using mozilla::ipc::PrincipalInfoToPrincipal;
+
+Maybe<IPCServiceWorkerDescriptor>
+ServiceWorkerRegistrationDescriptor::NewestInternal() const {
+  Maybe<IPCServiceWorkerDescriptor> result;
+  if (mData->installing().isSome()) {
+    result.emplace(mData->installing().ref());
+  } else if (mData->waiting().isSome()) {
+    result.emplace(mData->waiting().ref());
+  } else if (mData->active().isSome()) {
+    result.emplace(mData->active().ref());
+  }
+  return result;
+}
+
+ServiceWorkerRegistrationDescriptor::ServiceWorkerRegistrationDescriptor(
+    uint64_t aId, uint64_t aVersion, nsIPrincipal* aPrincipal,
+    const nsACString& aScope, ServiceWorkerUpdateViaCache aUpdateViaCache)
+    : mData(MakeUnique<IPCServiceWorkerRegistrationDescriptor>()) {
+  MOZ_ALWAYS_SUCCEEDS(
+      PrincipalToPrincipalInfo(aPrincipal, &mData->principalInfo()));
+
+  mData->id() = aId;
+  mData->version() = aVersion;
+  mData->scope() = aScope;
+  mData->updateViaCache() = aUpdateViaCache;
+  mData->installing() = Nothing();
+  mData->waiting() = Nothing();
+  mData->active() = Nothing();
+}
+
+ServiceWorkerRegistrationDescriptor::ServiceWorkerRegistrationDescriptor(
+    uint64_t aId, uint64_t aVersion,
+    const mozilla::ipc::PrincipalInfo& aPrincipalInfo, const nsACString& aScope,
+    ServiceWorkerUpdateViaCache aUpdateViaCache)
+    : mData(MakeUnique<IPCServiceWorkerRegistrationDescriptor>(
+          aId, aVersion, aPrincipalInfo, nsCString(aScope), aUpdateViaCache,
+          Nothing(), Nothing(), Nothing())) {}
+
+ServiceWorkerRegistrationDescriptor::ServiceWorkerRegistrationDescriptor(
+    const IPCServiceWorkerRegistrationDescriptor& aDescriptor)
+    : mData(MakeUnique<IPCServiceWorkerRegistrationDescriptor>(aDescriptor)) {
+  MOZ_DIAGNOSTIC_ASSERT(IsValid());
+}
+
+ServiceWorkerRegistrationDescriptor::ServiceWorkerRegistrationDescriptor(
+    const ServiceWorkerRegistrationDescriptor& aRight) {
+  // UniquePtr doesn't have a default copy constructor, so we can't rely
+  // on default copy construction.  Use the assignment operator to
+  // minimize duplication.
+  operator=(aRight);
+}
+
+ServiceWorkerRegistrationDescriptor&
+ServiceWorkerRegistrationDescriptor::operator=(
+    const ServiceWorkerRegistrationDescriptor& aRight) {
+  if (this == &aRight) {
+    return *this;
+  }
+  mData.reset();
+  mData = MakeUnique<IPCServiceWorkerRegistrationDescriptor>(*aRight.mData);
+  MOZ_DIAGNOSTIC_ASSERT(IsValid());
+  return *this;
+}
+
+ServiceWorkerRegistrationDescriptor::ServiceWorkerRegistrationDescriptor(
+    ServiceWorkerRegistrationDescriptor&& aRight)
+    : mData(std::move(aRight.mData)) {
+  MOZ_DIAGNOSTIC_ASSERT(IsValid());
+}
+
+ServiceWorkerRegistrationDescriptor&
+ServiceWorkerRegistrationDescriptor::operator=(
+    ServiceWorkerRegistrationDescriptor&& aRight) {
+  mData.reset();
+  mData = std::move(aRight.mData);
+  MOZ_DIAGNOSTIC_ASSERT(IsValid());
+  return *this;
+}
+
+ServiceWorkerRegistrationDescriptor::~ServiceWorkerRegistrationDescriptor() {
+  // Non-default destructor to avoid exposing the IPC type in the header.
+}
+
+bool ServiceWorkerRegistrationDescriptor::operator==(
+    const ServiceWorkerRegistrationDescriptor& aRight) const {
+  return *mData == *aRight.mData;
+}
+
+uint64_t ServiceWorkerRegistrationDescriptor::Id() const { return mData->id(); }
+
+uint64_t ServiceWorkerRegistrationDescriptor::Version() const {
+  return mData->version();
+}
+
+ServiceWorkerUpdateViaCache
+ServiceWorkerRegistrationDescriptor::UpdateViaCache() const {
+  return mData->updateViaCache();
+}
+
+const mozilla::ipc::PrincipalInfo&
+ServiceWorkerRegistrationDescriptor::PrincipalInfo() const {
+  return mData->principalInfo();
+}
+
+Result<nsCOMPtr<nsIPrincipal>, nsresult>
+ServiceWorkerRegistrationDescriptor::GetPrincipal() const {
+  AssertIsOnMainThread();
+  return PrincipalInfoToPrincipal(mData->principalInfo());
+}
+
+const nsCString& ServiceWorkerRegistrationDescriptor::Scope() const {
+  return mData->scope();
+}
+
+Maybe<ServiceWorkerDescriptor>
+ServiceWorkerRegistrationDescriptor::GetInstalling() const {
+  Maybe<ServiceWorkerDescriptor> result;
+
+  if (mData->installing().isSome()) {
+    result.emplace(ServiceWorkerDescriptor(mData->installing().ref()));
+  }
+
+  return result;
+}
+
+Maybe<ServiceWorkerDescriptor> ServiceWorkerRegistrationDescriptor::GetWaiting()
+    const {
+  Maybe<ServiceWorkerDescriptor> result;
+
+  if (mData->waiting().isSome()) {
+    result.emplace(ServiceWorkerDescriptor(mData->waiting().ref()));
+  }
+
+  return result;
+}
+
+Maybe<ServiceWorkerDescriptor> ServiceWorkerRegistrationDescriptor::GetActive()
+    const {
+  Maybe<ServiceWorkerDescriptor> result;
+
+  if (mData->active().isSome()) {
+    result.emplace(ServiceWorkerDescriptor(mData->active().ref()));
+  }
+
+  return result;
+}
+
+Maybe<ServiceWorkerDescriptor> ServiceWorkerRegistrationDescriptor::Newest()
+    const {
+  Maybe<ServiceWorkerDescriptor> result;
+  Maybe<IPCServiceWorkerDescriptor> newest(NewestInternal());
+  if (newest.isSome()) {
+    result.emplace(ServiceWorkerDescriptor(newest.ref()));
+  }
+  return result;
+}
+
+bool ServiceWorkerRegistrationDescriptor::HasWorker(
+    const ServiceWorkerDescriptor& aDescriptor) const {
+  Maybe<ServiceWorkerDescriptor> installing = GetInstalling();
+  Maybe<ServiceWorkerDescriptor> waiting = GetWaiting();
+  Maybe<ServiceWorkerDescriptor> active = GetActive();
+  return (installing.isSome() && installing.ref().Matches(aDescriptor)) ||
+         (waiting.isSome() && waiting.ref().Matches(aDescriptor)) ||
+         (active.isSome() && active.ref().Matches(aDescriptor));
+}
+
+namespace {
+
+bool IsValidWorker(
+    const Maybe<IPCServiceWorkerDescriptor>& aWorker, const nsACString& aScope,
+    const mozilla::ipc::ContentPrincipalInfo& aContentPrincipal) {
+  if (aWorker.isNothing()) {
+    return true;
+  }
+
+  auto& worker = aWorker.ref();
+  if (worker.scope() != aScope) {
+    return false;
+  }
+
+  auto& principalInfo = worker.principalInfo();
+  if (principalInfo.type() !=
+      mozilla::ipc::PrincipalInfo::TContentPrincipalInfo) {
+    return false;
+  }
+
+  auto& contentPrincipal = principalInfo.get_ContentPrincipalInfo();
+  if (contentPrincipal.originNoSuffix() != aContentPrincipal.originNoSuffix() ||
+      contentPrincipal.attrs() != aContentPrincipal.attrs()) {
+    return false;
+  }
+
+  return true;
+}
+
+}  // anonymous namespace
+
+bool ServiceWorkerRegistrationDescriptor::IsValid() const {
+  auto& principalInfo = PrincipalInfo();
+  if (principalInfo.type() !=
+      mozilla::ipc::PrincipalInfo::TContentPrincipalInfo) {
+    return false;
+  }
+
+  auto& contentPrincipal = principalInfo.get_ContentPrincipalInfo();
+  if (!IsValidWorker(mData->installing(), Scope(), contentPrincipal) ||
+      !IsValidWorker(mData->waiting(), Scope(), contentPrincipal) ||
+      !IsValidWorker(mData->active(), Scope(), contentPrincipal)) {
+    return false;
+  }
+
+  return true;
+}
+
+void ServiceWorkerRegistrationDescriptor::SetUpdateViaCache(
+    ServiceWorkerUpdateViaCache aUpdateViaCache) {
+  mData->updateViaCache() = aUpdateViaCache;
+}
+
+void ServiceWorkerRegistrationDescriptor::SetWorkers(
+    ServiceWorkerInfo* aInstalling, ServiceWorkerInfo* aWaiting,
+    ServiceWorkerInfo* aActive) {
+  if (aInstalling) {
+    aInstalling->SetRegistrationVersion(Version());
+    mData->installing() = Some(aInstalling->Descriptor().ToIPC());
+  } else {
+    mData->installing() = Nothing();
+  }
+
+  if (aWaiting) {
+    aWaiting->SetRegistrationVersion(Version());
+    mData->waiting() = Some(aWaiting->Descriptor().ToIPC());
+  } else {
+    mData->waiting() = Nothing();
+  }
+
+  if (aActive) {
+    aActive->SetRegistrationVersion(Version());
+    mData->active() = Some(aActive->Descriptor().ToIPC());
+  } else {
+    mData->active() = Nothing();
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(IsValid());
+}
+
+void ServiceWorkerRegistrationDescriptor::SetVersion(uint64_t aVersion) {
+  MOZ_DIAGNOSTIC_ASSERT(aVersion > mData->version());
+  mData->version() = aVersion;
+}
+
+const IPCServiceWorkerRegistrationDescriptor&
+ServiceWorkerRegistrationDescriptor::ToIPC() const {
+  return *mData;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.h b/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.h
new file mode 100644
index 0000000000..ec0f969868
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationDescriptor.h
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _mozilla_dom_ServiceWorkerRegistrationDescriptor_h
+#define _mozilla_dom_ServiceWorkerRegistrationDescriptor_h
+
+#include "mozilla/Maybe.h"
+#include "mozilla/dom/ServiceWorkerDescriptor.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+
+namespace ipc {
+class PrincipalInfo;
+}  // namespace ipc
+
+namespace dom {
+
+class IPCServiceWorkerRegistrationDescriptor;
+class ServiceWorkerInfo;
+enum class ServiceWorkerUpdateViaCache : uint8_t;
+
+// This class represents a snapshot of a particular
+// ServiceWorkerRegistrationInfo object. It is threadsafe and can be
+// transferred across processes.
+class ServiceWorkerRegistrationDescriptor final {
+  // This class is largely a wrapper wround an IPDL generated struct.  We
+  // need the wrapper class since IPDL generated code includes windows.h
+  // which is in turn incompatible with bindings code.
+  UniquePtr<IPCServiceWorkerRegistrationDescriptor> mData;
+
+  Maybe<IPCServiceWorkerDescriptor> NewestInternal() const;
+
+ public:
+  ServiceWorkerRegistrationDescriptor(
+      uint64_t aId, uint64_t aVersion, nsIPrincipal* aPrincipal,
+      const nsACString& aScope, ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  ServiceWorkerRegistrationDescriptor(
+      uint64_t aId, uint64_t aVersion,
+      const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
+      const nsACString& aScope, ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  explicit ServiceWorkerRegistrationDescriptor(
+      const IPCServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  ServiceWorkerRegistrationDescriptor(
+      const ServiceWorkerRegistrationDescriptor& aRight);
+
+  ServiceWorkerRegistrationDescriptor& operator=(
+      const ServiceWorkerRegistrationDescriptor& aRight);
+
+  ServiceWorkerRegistrationDescriptor(
+      ServiceWorkerRegistrationDescriptor&& aRight);
+
+  ServiceWorkerRegistrationDescriptor& operator=(
+      ServiceWorkerRegistrationDescriptor&& aRight);
+
+  ~ServiceWorkerRegistrationDescriptor();
+
+  bool operator==(const ServiceWorkerRegistrationDescriptor& aRight) const;
+
+  uint64_t Id() const;
+
+  uint64_t Version() const;
+
+  ServiceWorkerUpdateViaCache UpdateViaCache() const;
+
+  const mozilla::ipc::PrincipalInfo& PrincipalInfo() const;
+
+  Result<nsCOMPtr<nsIPrincipal>, nsresult> GetPrincipal() const;
+
+  const nsCString& Scope() const;
+
+  Maybe<ServiceWorkerDescriptor> GetInstalling() const;
+
+  Maybe<ServiceWorkerDescriptor> GetWaiting() const;
+
+  Maybe<ServiceWorkerDescriptor> GetActive() const;
+
+  Maybe<ServiceWorkerDescriptor> Newest() const;
+
+  bool HasWorker(const ServiceWorkerDescriptor& aDescriptor) const;
+
+  bool IsValid() const;
+
+  void SetUpdateViaCache(ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  void SetWorkers(ServiceWorkerInfo* aInstalling, ServiceWorkerInfo* aWaiting,
+                  ServiceWorkerInfo* aActive);
+
+  void SetVersion(uint64_t aVersion);
+
+  // Expose the underlying IPC type so that it can be passed via IPC.
+  const IPCServiceWorkerRegistrationDescriptor& ToIPC() const;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // _mozilla_dom_ServiceWorkerRegistrationDescriptor_h
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationInfo.cpp b/dom/serviceworkers/ServiceWorkerRegistrationInfo.cpp
new file mode 100644
index 0000000000..d4a99e977e
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationInfo.cpp
@@ -0,0 +1,905 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistrationInfo.h"
+
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerPrivate.h"
+#include "ServiceWorkerRegistrationListener.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class ContinueActivateRunnable final : public LifeCycleEventCallback {
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  bool mSuccess;
+
+ public:
+  explicit ContinueActivateRunnable(
+      const nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration)
+      : mRegistration(aRegistration), mSuccess(false) {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  void SetResult(bool aResult) override { mSuccess = aResult; }
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    mRegistration->FinishActivate(mSuccess);
+    mRegistration = nullptr;
+    return NS_OK;
+  }
+};
+
+}  // anonymous namespace
+
+void ServiceWorkerRegistrationInfo::ShutdownWorkers() {
+  ForEachWorker([](RefPtr<ServiceWorkerInfo>& aWorker) {
+    aWorker->WorkerPrivate()->NoteDeadServiceWorkerInfo();
+    aWorker = nullptr;
+  });
+}
+
+void ServiceWorkerRegistrationInfo::Clear() {
+  ForEachWorker([](RefPtr<ServiceWorkerInfo>& aWorker) {
+    aWorker->UpdateState(ServiceWorkerState::Redundant);
+    aWorker->UpdateRedundantTime();
+  });
+
+  // FIXME: Abort any inflight requests from installing worker.
+
+  ShutdownWorkers();
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+  NotifyCleared();
+}
+
+void ServiceWorkerRegistrationInfo::ClearAsCorrupt() {
+  mCorrupt = true;
+  Clear();
+}
+
+bool ServiceWorkerRegistrationInfo::IsCorrupt() const { return mCorrupt; }
+
+ServiceWorkerRegistrationInfo::ServiceWorkerRegistrationInfo(
+    const nsACString& aScope, nsIPrincipal* aPrincipal,
+    ServiceWorkerUpdateViaCache aUpdateViaCache,
+    IPCNavigationPreloadState&& aNavigationPreloadState)
+    : mPrincipal(aPrincipal),
+      mDescriptor(GetNextId(), GetNextVersion(), aPrincipal, aScope,
+                  aUpdateViaCache),
+      mControlledClientsCounter(0),
+      mDelayMultiplier(0),
+      mUpdateState(NoUpdate),
+      mCreationTime(PR_Now()),
+      mCreationTimeStamp(TimeStamp::Now()),
+      mLastUpdateTime(0),
+      mUnregistered(false),
+      mCorrupt(false),
+      mNavigationPreloadState(std::move(aNavigationPreloadState)) {
+  MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
+}
+
+ServiceWorkerRegistrationInfo::~ServiceWorkerRegistrationInfo() {
+  MOZ_DIAGNOSTIC_ASSERT(!IsControllingClients());
+}
+
+void ServiceWorkerRegistrationInfo::AddInstance(
+    ServiceWorkerRegistrationListener* aInstance,
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  MOZ_DIAGNOSTIC_ASSERT(aInstance);
+  MOZ_ASSERT(!mInstanceList.Contains(aInstance));
+  MOZ_DIAGNOSTIC_ASSERT(aDescriptor.Id() == mDescriptor.Id());
+  MOZ_DIAGNOSTIC_ASSERT(aDescriptor.PrincipalInfo() ==
+                        mDescriptor.PrincipalInfo());
+  MOZ_DIAGNOSTIC_ASSERT(aDescriptor.Scope() == mDescriptor.Scope());
+  MOZ_DIAGNOSTIC_ASSERT(aDescriptor.Version() <= mDescriptor.Version());
+  uint64_t lastVersion = aDescriptor.Version();
+  for (auto& entry : mVersionList) {
+    if (lastVersion > entry->mDescriptor.Version()) {
+      continue;
+    }
+    lastVersion = entry->mDescriptor.Version();
+    aInstance->UpdateState(entry->mDescriptor);
+  }
+  // Note, the mDescriptor may be contained in the version list.  Since the
+  // version list is aged out, though, it may also not be in the version list.
+  // So always check for the mDescriptor update here.
+  if (lastVersion < mDescriptor.Version()) {
+    aInstance->UpdateState(mDescriptor);
+  }
+  mInstanceList.AppendElement(aInstance);
+}
+
+void ServiceWorkerRegistrationInfo::RemoveInstance(
+    ServiceWorkerRegistrationListener* aInstance) {
+  MOZ_DIAGNOSTIC_ASSERT(aInstance);
+  DebugOnly<bool> removed = mInstanceList.RemoveElement(aInstance);
+  MOZ_ASSERT(removed);
+}
+
+const nsCString& ServiceWorkerRegistrationInfo::Scope() const {
+  return mDescriptor.Scope();
+}
+
+nsIPrincipal* ServiceWorkerRegistrationInfo::Principal() const {
+  return mPrincipal;
+}
+
+bool ServiceWorkerRegistrationInfo::IsUnregistered() const {
+  return mUnregistered;
+}
+
+void ServiceWorkerRegistrationInfo::SetUnregistered() {
+#ifdef DEBUG
+  MOZ_ASSERT(!mUnregistered);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_ASSERT(swm);
+
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      swm->GetRegistration(Principal(), Scope());
+  MOZ_ASSERT(registration != this);
+#endif
+
+  mUnregistered = true;
+  NotifyChromeRegistrationListeners();
+}
+
+NS_IMPL_ISUPPORTS(ServiceWorkerRegistrationInfo,
+                  nsIServiceWorkerRegistrationInfo)
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetPrincipal(nsIPrincipal** aPrincipal) {
+  MOZ_ASSERT(NS_IsMainThread());
+  NS_ADDREF(*aPrincipal = mPrincipal);
+  return NS_OK;
+}
+
+NS_IMETHODIMP ServiceWorkerRegistrationInfo::GetUnregistered(
+    bool* aUnregistered) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aUnregistered);
+  *aUnregistered = mUnregistered;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetScope(nsAString& aScope) {
+  MOZ_ASSERT(NS_IsMainThread());
+  CopyUTF8toUTF16(Scope(), aScope);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetScriptSpec(nsAString& aScriptSpec) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerInfo> newest = NewestIncludingEvaluating();
+  if (newest) {
+    CopyUTF8toUTF16(newest->ScriptSpec(), aScriptSpec);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetUpdateViaCache(uint16_t* aUpdateViaCache) {
+  *aUpdateViaCache = static_cast<uint16_t>(GetUpdateViaCache());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetLastUpdateTime(PRTime* _retval) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(_retval);
+  *_retval = mLastUpdateTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetEvaluatingWorker(
+    nsIServiceWorkerInfo** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerInfo> info = mEvaluatingWorker;
+  info.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetInstallingWorker(
+    nsIServiceWorkerInfo** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerInfo> info = mInstallingWorker;
+  info.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetWaitingWorker(
+    nsIServiceWorkerInfo** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerInfo> info = mWaitingWorker;
+  info.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetActiveWorker(nsIServiceWorkerInfo** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerInfo> info = mActiveWorker;
+  info.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetQuotaUsageCheckCount(
+    int32_t* aQuotaUsageCheckCount) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aQuotaUsageCheckCount);
+
+  // This value is actually stored on SWM's internal-only
+  // RegistrationDataPerPrincipal structure, but we expose it here for
+  // simplicity for our consumers, so we have to ask SWM to look it up for us.
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_ASSERT(swm);
+
+  *aQuotaUsageCheckCount = swm->GetPrincipalQuotaUsageCheckCount(mPrincipal);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::GetWorkerByID(uint64_t aID,
+                                             nsIServiceWorkerInfo** aResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aResult);
+
+  RefPtr<ServiceWorkerInfo> info = GetServiceWorkerInfoById(aID);
+  // It is ok to return null for a missing service worker info.
+  info.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::AddListener(
+    nsIServiceWorkerRegistrationInfoListener* aListener) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aListener || mListeners.Contains(aListener)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mListeners.AppendElement(aListener);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::RemoveListener(
+    nsIServiceWorkerRegistrationInfoListener* aListener) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aListener || !mListeners.Contains(aListener)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mListeners.RemoveElement(aListener);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationInfo::ForceShutdown() {
+  ClearInstalling();
+  ShutdownWorkers();
+  return NS_OK;
+}
+
+already_AddRefed<ServiceWorkerInfo>
+ServiceWorkerRegistrationInfo::GetServiceWorkerInfoById(uint64_t aId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerInfo> serviceWorker;
+  if (mEvaluatingWorker && mEvaluatingWorker->ID() == aId) {
+    serviceWorker = mEvaluatingWorker;
+  } else if (mInstallingWorker && mInstallingWorker->ID() == aId) {
+    serviceWorker = mInstallingWorker;
+  } else if (mWaitingWorker && mWaitingWorker->ID() == aId) {
+    serviceWorker = mWaitingWorker;
+  } else if (mActiveWorker && mActiveWorker->ID() == aId) {
+    serviceWorker = mActiveWorker;
+  }
+
+  return serviceWorker.forget();
+}
+
+void ServiceWorkerRegistrationInfo::TryToActivateAsync(
+    TryToActivateCallback&& aCallback) {
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(
+      NewRunnableMethod<StoreCopyPassByRRef<TryToActivateCallback>>(
+          "ServiceWorkerRegistrationInfo::TryToActivate", this,
+          &ServiceWorkerRegistrationInfo::TryToActivate,
+          std::move(aCallback))));
+}
+
+/*
+ * TryToActivate should not be called directly, use TryToActivateAsync instead.
+ */
+void ServiceWorkerRegistrationInfo::TryToActivate(
+    TryToActivateCallback&& aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  bool controlling = IsControllingClients();
+  bool skipWaiting = mWaitingWorker && mWaitingWorker->SkipWaitingFlag();
+  bool idle = IsIdle();
+  if (idle && (!controlling || skipWaiting)) {
+    Activate();
+  }
+
+  if (aCallback) {
+    aCallback();
+  }
+}
+
+void ServiceWorkerRegistrationInfo::Activate() {
+  if (!mWaitingWorker) {
+    return;
+  }
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // browser shutdown began during async activation step
+    return;
+  }
+
+  TransitionWaitingToActive();
+
+  // FIXME(nsm): Unlink appcache if there is one.
+
+  // "Queue a task to fire a simple event named controllerchange..."
+  MOZ_DIAGNOSTIC_ASSERT(mActiveWorker);
+  swm->UpdateClientControllers(this);
+
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> handle(
+      new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
+          "ServiceWorkerRegistrationInfoProxy", this));
+  RefPtr<LifeCycleEventCallback> callback =
+      new ContinueActivateRunnable(handle);
+
+  ServiceWorkerPrivate* workerPrivate = mActiveWorker->WorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+  nsresult rv = workerPrivate->SendLifeCycleEvent(u"activate"_ns, callback);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    nsCOMPtr<nsIRunnable> failRunnable = NewRunnableMethod<bool>(
+        "dom::ServiceWorkerRegistrationInfo::FinishActivate", this,
+        &ServiceWorkerRegistrationInfo::FinishActivate, false /* success */);
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(failRunnable.forget()));
+    return;
+  }
+}
+
+void ServiceWorkerRegistrationInfo::FinishActivate(bool aSuccess) {
+  if (mUnregistered || !mActiveWorker ||
+      mActiveWorker->State() != ServiceWorkerState::Activating) {
+    return;
+  }
+
+  // Activation never fails, so aSuccess is ignored.
+  mActiveWorker->UpdateState(ServiceWorkerState::Activated);
+  mActiveWorker->UpdateActivatedTime();
+
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // browser shutdown started during async activation completion step
+    return;
+  }
+  swm->StoreRegistration(mPrincipal, this);
+}
+
+void ServiceWorkerRegistrationInfo::RefreshLastUpdateCheckTime() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mLastUpdateTime =
+      mCreationTime +
+      static_cast<PRTime>(
+          (TimeStamp::Now() - mCreationTimeStamp).ToMicroseconds());
+  NotifyChromeRegistrationListeners();
+}
+
+bool ServiceWorkerRegistrationInfo::IsLastUpdateCheckTimeOverOneDay() const {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // For testing.
+  if (Preferences::GetBool("dom.serviceWorkers.testUpdateOverOneDay")) {
+    return true;
+  }
+
+  const int64_t kSecondsPerDay = 86400;
+  const int64_t nowMicros =
+      mCreationTime +
+      static_cast<PRTime>(
+          (TimeStamp::Now() - mCreationTimeStamp).ToMicroseconds());
+
+  // now < mLastUpdateTime if the system time is reset between storing
+  // and loading mLastUpdateTime from ServiceWorkerRegistrar.
+  if (nowMicros < mLastUpdateTime ||
+      (nowMicros - mLastUpdateTime) / PR_USEC_PER_SEC > kSecondsPerDay) {
+    return true;
+  }
+  return false;
+}
+
+void ServiceWorkerRegistrationInfo::UpdateRegistrationState() {
+  UpdateRegistrationState(mDescriptor.UpdateViaCache());
+}
+
+void ServiceWorkerRegistrationInfo::UpdateRegistrationState(
+    ServiceWorkerUpdateViaCache aUpdateViaCache) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  TimeStamp oldest = TimeStamp::Now() - TimeDuration::FromSeconds(30);
+  if (!mVersionList.IsEmpty() && mVersionList[0]->mTimeStamp < oldest) {
+    nsTArray<UniquePtr<VersionEntry>> list = std::move(mVersionList);
+    for (auto& entry : list) {
+      if (entry->mTimeStamp >= oldest) {
+        mVersionList.AppendElement(std::move(entry));
+      }
+    }
+  }
+  mVersionList.AppendElement(MakeUnique<VersionEntry>(mDescriptor));
+
+  // We are going to modify the descriptor, so increase its version number.
+  mDescriptor.SetVersion(GetNextVersion());
+
+  // Note, this also sets the new version number on the ServiceWorkerInfo
+  // objects before we copy over their updated descriptors.
+  mDescriptor.SetWorkers(mInstallingWorker, mWaitingWorker, mActiveWorker);
+
+  mDescriptor.SetUpdateViaCache(aUpdateViaCache);
+
+  for (RefPtr<ServiceWorkerRegistrationListener> pinnedTarget :
+       mInstanceList.ForwardRange()) {
+    pinnedTarget->UpdateState(mDescriptor);
+  }
+}
+
+void ServiceWorkerRegistrationInfo::NotifyChromeRegistrationListeners() {
+  nsTArray<nsCOMPtr<nsIServiceWorkerRegistrationInfoListener>> listeners(
+      mListeners.Clone());
+  for (size_t index = 0; index < listeners.Length(); ++index) {
+    listeners[index]->OnChange();
+  }
+}
+
+void ServiceWorkerRegistrationInfo::MaybeScheduleTimeCheckAndUpdate() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // shutting down, do nothing
+    return;
+  }
+
+  if (mUpdateState == NoUpdate) {
+    mUpdateState = NeedTimeCheckAndUpdate;
+  }
+
+  swm->ScheduleUpdateTimer(mPrincipal, Scope());
+}
+
+void ServiceWorkerRegistrationInfo::MaybeScheduleUpdate() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (!swm) {
+    // shutting down, do nothing
+    return;
+  }
+
+  // When reach the navigation fault threshold, calling unregister instead of
+  // scheduling update.
+  if (mActiveWorker && !mUnregistered) {
+    uint32_t navigationFaultCount;
+    mActiveWorker->GetNavigationFaultCount(&navigationFaultCount);
+    const auto navigationFaultThreshold = StaticPrefs::
+        dom_serviceWorkers_mitigations_navigation_fault_threshold();
+    // Disable unregister mitigation when navigation fault threshold is 0.
+    if (navigationFaultThreshold <= navigationFaultCount &&
+        navigationFaultThreshold != 0) {
+      CheckQuotaUsage();
+      swm->Unregister(mPrincipal, nullptr, NS_ConvertUTF8toUTF16(Scope()));
+      return;
+    }
+  }
+
+  mUpdateState = NeedUpdate;
+
+  swm->ScheduleUpdateTimer(mPrincipal, Scope());
+}
+
+bool ServiceWorkerRegistrationInfo::CheckAndClearIfUpdateNeeded() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  bool result =
+      mUpdateState == NeedUpdate || (mUpdateState == NeedTimeCheckAndUpdate &&
+                                     IsLastUpdateCheckTimeOverOneDay());
+
+  mUpdateState = NoUpdate;
+
+  return result;
+}
+
+ServiceWorkerInfo* ServiceWorkerRegistrationInfo::GetEvaluating() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mEvaluatingWorker;
+}
+
+ServiceWorkerInfo* ServiceWorkerRegistrationInfo::GetInstalling() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mInstallingWorker;
+}
+
+ServiceWorkerInfo* ServiceWorkerRegistrationInfo::GetWaiting() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mWaitingWorker;
+}
+
+ServiceWorkerInfo* ServiceWorkerRegistrationInfo::GetActive() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mActiveWorker;
+}
+
+ServiceWorkerInfo* ServiceWorkerRegistrationInfo::GetByDescriptor(
+    const ServiceWorkerDescriptor& aDescriptor) const {
+  if (mActiveWorker && mActiveWorker->Descriptor().Matches(aDescriptor)) {
+    return mActiveWorker;
+  }
+  if (mWaitingWorker && mWaitingWorker->Descriptor().Matches(aDescriptor)) {
+    return mWaitingWorker;
+  }
+  if (mInstallingWorker &&
+      mInstallingWorker->Descriptor().Matches(aDescriptor)) {
+    return mInstallingWorker;
+  }
+  if (mEvaluatingWorker &&
+      mEvaluatingWorker->Descriptor().Matches(aDescriptor)) {
+    return mEvaluatingWorker;
+  }
+  return nullptr;
+}
+
+void ServiceWorkerRegistrationInfo::SetEvaluating(
+    ServiceWorkerInfo* aServiceWorker) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aServiceWorker);
+  MOZ_ASSERT(!mEvaluatingWorker);
+  MOZ_ASSERT(!mInstallingWorker);
+  MOZ_ASSERT(mWaitingWorker != aServiceWorker);
+  MOZ_ASSERT(mActiveWorker != aServiceWorker);
+
+  mEvaluatingWorker = aServiceWorker;
+
+  // We don't call UpdateRegistrationState() here because the evaluating worker
+  // is currently not exposed to content on the registration, so calling it here
+  // would produce redundant IPC traffic.
+  NotifyChromeRegistrationListeners();
+}
+
+void ServiceWorkerRegistrationInfo::ClearEvaluating() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mEvaluatingWorker) {
+    return;
+  }
+
+  mEvaluatingWorker->UpdateState(ServiceWorkerState::Redundant);
+  // We don't update the redundant time for the sw here, since we've not expose
+  // evalutingWorker yet.
+  mEvaluatingWorker = nullptr;
+
+  // As for SetEvaluating, UpdateRegistrationState() does not need to be called.
+  NotifyChromeRegistrationListeners();
+}
+
+void ServiceWorkerRegistrationInfo::ClearInstalling() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mInstallingWorker) {
+    return;
+  }
+
+  RefPtr<ServiceWorkerInfo> installing = std::move(mInstallingWorker);
+  installing->UpdateState(ServiceWorkerState::Redundant);
+  installing->UpdateRedundantTime();
+
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+}
+
+void ServiceWorkerRegistrationInfo::TransitionEvaluatingToInstalling() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mEvaluatingWorker);
+  MOZ_ASSERT(!mInstallingWorker);
+
+  mInstallingWorker = std::move(mEvaluatingWorker);
+  mInstallingWorker->UpdateState(ServiceWorkerState::Installing);
+
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+}
+
+void ServiceWorkerRegistrationInfo::TransitionInstallingToWaiting() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mInstallingWorker);
+
+  if (mWaitingWorker) {
+    MOZ_ASSERT(mInstallingWorker->CacheName() != mWaitingWorker->CacheName());
+    mWaitingWorker->UpdateState(ServiceWorkerState::Redundant);
+    mWaitingWorker->UpdateRedundantTime();
+  }
+
+  mWaitingWorker = std::move(mInstallingWorker);
+  mWaitingWorker->UpdateState(ServiceWorkerState::Installed);
+  mWaitingWorker->UpdateInstalledTime();
+
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+
+  // TODO: When bug 1426401 is implemented we will need to call
+  //       StoreRegistration() here to persist the waiting worker.
+}
+
+void ServiceWorkerRegistrationInfo::SetActive(
+    ServiceWorkerInfo* aServiceWorker) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aServiceWorker);
+
+  // TODO: Assert installing, waiting, and active are nullptr once the SWM
+  //       moves to the parent process.  After that happens this code will
+  //       only run for browser initialization and not for cross-process
+  //       overrides.
+  MOZ_ASSERT(mInstallingWorker != aServiceWorker);
+  MOZ_ASSERT(mWaitingWorker != aServiceWorker);
+  MOZ_ASSERT(mActiveWorker != aServiceWorker);
+
+  if (mActiveWorker) {
+    MOZ_ASSERT(aServiceWorker->CacheName() != mActiveWorker->CacheName());
+    mActiveWorker->UpdateState(ServiceWorkerState::Redundant);
+    mActiveWorker->UpdateRedundantTime();
+  }
+
+  // The active worker is being overriden due to initial load or
+  // another process activating a worker.  Move straight to the
+  // Activated state.
+  mActiveWorker = aServiceWorker;
+  mActiveWorker->SetActivateStateUncheckedWithoutEvent(
+      ServiceWorkerState::Activated);
+
+  // We don't need to update activated time when we load registration from
+  // registrar.
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+}
+
+void ServiceWorkerRegistrationInfo::TransitionWaitingToActive() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mWaitingWorker);
+
+  if (mActiveWorker) {
+    MOZ_ASSERT(mWaitingWorker->CacheName() != mActiveWorker->CacheName());
+    mActiveWorker->UpdateState(ServiceWorkerState::Redundant);
+    mActiveWorker->UpdateRedundantTime();
+  }
+
+  // We are transitioning from waiting to active normally, so go to
+  // the activating state.
+  mActiveWorker = std::move(mWaitingWorker);
+  mActiveWorker->UpdateState(ServiceWorkerState::Activating);
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      "ServiceWorkerRegistrationInfo::TransitionWaitingToActive", [] {
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        if (swm) {
+          swm->CheckPendingReadyPromises();
+        }
+      });
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+  UpdateRegistrationState();
+  NotifyChromeRegistrationListeners();
+}
+
+bool ServiceWorkerRegistrationInfo::IsIdle() const {
+  return !mActiveWorker || mActiveWorker->WorkerPrivate()->IsIdle();
+}
+
+ServiceWorkerUpdateViaCache ServiceWorkerRegistrationInfo::GetUpdateViaCache()
+    const {
+  return mDescriptor.UpdateViaCache();
+}
+
+void ServiceWorkerRegistrationInfo::SetUpdateViaCache(
+    ServiceWorkerUpdateViaCache aUpdateViaCache) {
+  UpdateRegistrationState(aUpdateViaCache);
+}
+
+int64_t ServiceWorkerRegistrationInfo::GetLastUpdateTime() const {
+  return mLastUpdateTime;
+}
+
+void ServiceWorkerRegistrationInfo::SetLastUpdateTime(const int64_t aTime) {
+  if (aTime == 0) {
+    return;
+  }
+
+  mLastUpdateTime = aTime;
+}
+
+const ServiceWorkerRegistrationDescriptor&
+ServiceWorkerRegistrationInfo::Descriptor() const {
+  return mDescriptor;
+}
+
+uint64_t ServiceWorkerRegistrationInfo::Id() const { return mDescriptor.Id(); }
+
+uint64_t ServiceWorkerRegistrationInfo::Version() const {
+  return mDescriptor.Version();
+}
+
+uint32_t ServiceWorkerRegistrationInfo::GetUpdateDelay(
+    const bool aWithMultiplier) {
+  uint32_t delay = Preferences::GetInt("dom.serviceWorkers.update_delay", 1000);
+
+  if (!aWithMultiplier) {
+    return delay;
+  }
+
+  // This can potentially happen if you spam registration->Update(). We don't
+  // want to wrap to a lower value.
+  if (mDelayMultiplier >= INT_MAX / (delay ? delay : 1)) {
+    return INT_MAX;
+  }
+
+  delay *= mDelayMultiplier;
+
+  if (!mControlledClientsCounter && mDelayMultiplier < (INT_MAX / 30)) {
+    mDelayMultiplier = (mDelayMultiplier ? mDelayMultiplier : 1) * 30;
+  }
+
+  return delay;
+}
+
+void ServiceWorkerRegistrationInfo::FireUpdateFound() {
+  for (RefPtr<ServiceWorkerRegistrationListener> pinnedTarget :
+       mInstanceList.ForwardRange()) {
+    pinnedTarget->FireUpdateFound();
+  }
+}
+
+void ServiceWorkerRegistrationInfo::NotifyCleared() {
+  for (RefPtr<ServiceWorkerRegistrationListener> pinnedTarget :
+       mInstanceList.ForwardRange()) {
+    pinnedTarget->RegistrationCleared();
+  }
+}
+
+void ServiceWorkerRegistrationInfo::ClearWhenIdle() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(IsUnregistered());
+  MOZ_ASSERT(!IsControllingClients());
+  MOZ_ASSERT(!IsIdle(), "Already idle!");
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_ASSERT(swm);
+
+  swm->AddOrphanedRegistration(this);
+
+  /**
+   * Although a Service Worker will transition to idle many times during its
+   * lifetime, the promise is only resolved once `GetIdlePromise` has been
+   * called, populating the `MozPromiseHolder`. Additionally, this is the only
+   * time this method will be called for the given ServiceWorker. This means we
+   * will be notified to the transition we are interested in, and there are no
+   * other callers to get confused.
+   *
+   * Note that because we are using `MozPromise`, our callback will be invoked
+   * as a separate task, so there is a small potential for races in the event
+   * code if things are still holding onto the ServiceWorker binding and using
+   * `postMessage()` or other mechanisms to schedule new events on it, which
+   * would make it non-idle. However, this is a race inherent in the spec which
+   * does not deal with the reality of multiple threads in "Try Clear
+   * Registration".
+   */
+  GetActive()->WorkerPrivate()->GetIdlePromise()->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [self = RefPtr<ServiceWorkerRegistrationInfo>(this)](
+          const GenericPromise::ResolveOrRejectValue& aResult) {
+        MOZ_ASSERT(aResult.IsResolve());
+        // This registration was already unregistered and not controlling
+        // clients when `ClearWhenIdle` was called, so there should be no way
+        // that more clients were acquired.
+        MOZ_ASSERT(!self->IsControllingClients());
+        MOZ_ASSERT(self->IsIdle());
+        self->Clear();
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        if (swm) {
+          swm->RemoveOrphanedRegistration(self);
+        }
+      });
+}
+
+const nsID& ServiceWorkerRegistrationInfo::AgentClusterId() const {
+  return mAgentClusterId;
+}
+
+void ServiceWorkerRegistrationInfo::SetNavigationPreloadEnabled(
+    const bool& aEnabled) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mNavigationPreloadState.enabled() = aEnabled;
+}
+
+void ServiceWorkerRegistrationInfo::SetNavigationPreloadHeader(
+    const nsCString& aHeader) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mNavigationPreloadState.headerValue() = aHeader;
+}
+
+IPCNavigationPreloadState
+ServiceWorkerRegistrationInfo::GetNavigationPreloadState() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mNavigationPreloadState;
+}
+
+// static
+uint64_t ServiceWorkerRegistrationInfo::GetNextId() {
+  MOZ_ASSERT(NS_IsMainThread());
+  static uint64_t sNextId = 0;
+  return ++sNextId;
+}
+
+// static
+uint64_t ServiceWorkerRegistrationInfo::GetNextVersion() {
+  MOZ_ASSERT(NS_IsMainThread());
+  static uint64_t sNextVersion = 0;
+  return ++sNextVersion;
+}
+
+void ServiceWorkerRegistrationInfo::ForEachWorker(
+    void (*aFunc)(RefPtr<ServiceWorkerInfo>&)) {
+  if (mEvaluatingWorker) {
+    aFunc(mEvaluatingWorker);
+  }
+
+  if (mInstallingWorker) {
+    aFunc(mInstallingWorker);
+  }
+
+  if (mWaitingWorker) {
+    aFunc(mWaitingWorker);
+  }
+
+  if (mActiveWorker) {
+    aFunc(mActiveWorker);
+  }
+}
+
+void ServiceWorkerRegistrationInfo::CheckQuotaUsage() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_ASSERT(swm);
+
+  swm->CheckPrincipalQuotaUsage(mPrincipal, Scope());
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationInfo.h b/dom/serviceworkers/ServiceWorkerRegistrationInfo.h
new file mode 100644
index 0000000000..b8bd75cf71
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationInfo.h
@@ -0,0 +1,268 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerregistrationinfo_h
+#define mozilla_dom_serviceworkerregistrationinfo_h
+
+#include <functional>
+
+#include "mozilla/dom/IPCNavigationPreloadState.h"
+#include "mozilla/dom/ServiceWorkerInfo.h"
+#include "mozilla/dom/ServiceWorkerRegistrationBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrationDescriptor.h"
+#include "nsProxyRelease.h"
+#include "nsTObserverArray.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerRegistrationListener;
+
+class ServiceWorkerRegistrationInfo final
+    : public nsIServiceWorkerRegistrationInfo {
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  ServiceWorkerRegistrationDescriptor mDescriptor;
+  nsTArray<nsCOMPtr<nsIServiceWorkerRegistrationInfoListener>> mListeners;
+  nsTObserverArray<ServiceWorkerRegistrationListener*> mInstanceList;
+
+  struct VersionEntry {
+    const ServiceWorkerRegistrationDescriptor mDescriptor;
+    TimeStamp mTimeStamp;
+
+    explicit VersionEntry(
+        const ServiceWorkerRegistrationDescriptor& aDescriptor)
+        : mDescriptor(aDescriptor), mTimeStamp(TimeStamp::Now()) {}
+  };
+  nsTArray<UniquePtr<VersionEntry>> mVersionList;
+
+  const nsID mAgentClusterId = nsID::GenerateUUID();
+
+  uint32_t mControlledClientsCounter;
+  uint32_t mDelayMultiplier;
+
+  enum { NoUpdate, NeedTimeCheckAndUpdate, NeedUpdate } mUpdateState;
+
+  // Timestamp to track SWR's last update time
+  PRTime mCreationTime;
+  TimeStamp mCreationTimeStamp;
+  // The time of update is 0, if SWR've never been updated yet.
+  PRTime mLastUpdateTime;
+
+  RefPtr<ServiceWorkerInfo> mEvaluatingWorker;
+  RefPtr<ServiceWorkerInfo> mActiveWorker;
+  RefPtr<ServiceWorkerInfo> mWaitingWorker;
+  RefPtr<ServiceWorkerInfo> mInstallingWorker;
+
+  virtual ~ServiceWorkerRegistrationInfo();
+
+  // When unregister() is called on a registration, it is removed from the
+  // "scope to registration map" but not immediately "cleared" (i.e. its workers
+  // terminated, updated to the redundant state, etc.) because it may still be
+  // controlling clients. It is marked as unregistered and when all controlled
+  // clients go away, cleared. This way we can tell if a registration
+  // is unregistered by querying the object itself rather than incurring a table
+  // lookup (in the case when the registrations are passed around as pointers).
+  bool mUnregistered;
+
+  bool mCorrupt;
+
+  IPCNavigationPreloadState mNavigationPreloadState;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISERVICEWORKERREGISTRATIONINFO
+
+  using TryToActivateCallback = std::function<void()>;
+
+  ServiceWorkerRegistrationInfo(
+      const nsACString& aScope, nsIPrincipal* aPrincipal,
+      ServiceWorkerUpdateViaCache aUpdateViaCache,
+      IPCNavigationPreloadState&& aNavigationPreloadState);
+
+  void AddInstance(ServiceWorkerRegistrationListener* aInstance,
+                   const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  void RemoveInstance(ServiceWorkerRegistrationListener* aInstance);
+
+  const nsCString& Scope() const;
+
+  nsIPrincipal* Principal() const;
+
+  bool IsUnregistered() const;
+
+  void SetUnregistered();
+
+  already_AddRefed<ServiceWorkerInfo> Newest() const {
+    RefPtr<ServiceWorkerInfo> newest;
+    if (mInstallingWorker) {
+      newest = mInstallingWorker;
+    } else if (mWaitingWorker) {
+      newest = mWaitingWorker;
+    } else {
+      newest = mActiveWorker;
+    }
+
+    return newest.forget();
+  }
+
+  already_AddRefed<ServiceWorkerInfo> NewestIncludingEvaluating() const {
+    if (mEvaluatingWorker) {
+      RefPtr<ServiceWorkerInfo> newest = mEvaluatingWorker;
+      return newest.forget();
+    }
+    return Newest();
+  }
+
+  already_AddRefed<ServiceWorkerInfo> GetServiceWorkerInfoById(uint64_t aId);
+
+  void StartControllingClient() {
+    ++mControlledClientsCounter;
+    mDelayMultiplier = 0;
+  }
+
+  void StopControllingClient() {
+    MOZ_ASSERT(mControlledClientsCounter);
+    --mControlledClientsCounter;
+  }
+
+  bool IsControllingClients() const {
+    return mActiveWorker && mControlledClientsCounter;
+  }
+
+  // As a side effect, this nullifies
+  // `m{Evaluating,Installing,Waiting,Active}Worker`s.
+  void ShutdownWorkers();
+
+  void Clear();
+
+  void ClearAsCorrupt();
+
+  bool IsCorrupt() const;
+
+  void TryToActivateAsync(TryToActivateCallback&& aCallback = nullptr);
+
+  void TryToActivate(TryToActivateCallback&& aCallback);
+
+  void Activate();
+
+  void FinishActivate(bool aSuccess);
+
+  void RefreshLastUpdateCheckTime();
+
+  bool IsLastUpdateCheckTimeOverOneDay() const;
+
+  void MaybeScheduleTimeCheckAndUpdate();
+
+  void MaybeScheduleUpdate();
+
+  bool CheckAndClearIfUpdateNeeded();
+
+  ServiceWorkerInfo* GetEvaluating() const;
+
+  ServiceWorkerInfo* GetInstalling() const;
+
+  ServiceWorkerInfo* GetWaiting() const;
+
+  ServiceWorkerInfo* GetActive() const;
+
+  ServiceWorkerInfo* GetByDescriptor(
+      const ServiceWorkerDescriptor& aDescriptor) const;
+
+  // Set the given worker as the evaluating service worker.  The worker
+  // state is not changed.
+  void SetEvaluating(ServiceWorkerInfo* aServiceWorker);
+
+  // Remove an existing evaluating worker, if present.  The worker will
+  // be transitioned to the Redundant state.
+  void ClearEvaluating();
+
+  // Remove an existing installing worker, if present.  The worker will
+  // be transitioned to the Redundant state.
+  void ClearInstalling();
+
+  // Transition the current evaluating worker to be the installing worker.  The
+  // worker's state is update to Installing.
+  void TransitionEvaluatingToInstalling();
+
+  // Transition the current installing worker to be the waiting worker.  The
+  // worker's state is updated to Installed.
+  void TransitionInstallingToWaiting();
+
+  // Override the current active worker.  This is used during browser
+  // initialization to load persisted workers.  Its also used to propagate
+  // active workers across child processes in e10s.  This second use will
+  // go away once the ServiceWorkerManager moves to the parent process.
+  // The worker is transitioned to the Activated state.
+  void SetActive(ServiceWorkerInfo* aServiceWorker);
+
+  // Transition the current waiting worker to be the new active worker.  The
+  // worker is updated to the Activating state.
+  void TransitionWaitingToActive();
+
+  // Determine if the registration is actively performing work.
+  bool IsIdle() const;
+
+  ServiceWorkerUpdateViaCache GetUpdateViaCache() const;
+
+  void SetUpdateViaCache(ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  int64_t GetLastUpdateTime() const;
+
+  void SetLastUpdateTime(const int64_t aTime);
+
+  const ServiceWorkerRegistrationDescriptor& Descriptor() const;
+
+  uint64_t Id() const;
+
+  uint64_t Version() const;
+
+  uint32_t GetUpdateDelay(const bool aWithMultiplier = true);
+
+  void FireUpdateFound();
+
+  void NotifyCleared();
+
+  void ClearWhenIdle();
+
+  const nsID& AgentClusterId() const;
+
+  void SetNavigationPreloadEnabled(const bool& aEnabled);
+
+  void SetNavigationPreloadHeader(const nsCString& aHeader);
+
+  IPCNavigationPreloadState GetNavigationPreloadState() const;
+
+ private:
+  // Roughly equivalent to [[Update Registration State algorithm]]. Make sure
+  // this is called *before* updating SW instances' state, otherwise they
+  // may get CC-ed.
+  void UpdateRegistrationState();
+
+  void UpdateRegistrationState(ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  // Used by devtools to track changes to the properties of
+  // *nsIServiceWorkerRegistrationInfo*. Note, this doesn't necessarily need to
+  // be in sync with the DOM registration objects, but it does need to be called
+  // in the same task that changed |mInstallingWorker|, |mWaitingWorker| or
+  // |mActiveWorker|.
+  void NotifyChromeRegistrationListeners();
+
+  static uint64_t GetNextId();
+
+  static uint64_t GetNextVersion();
+
+  // `aFunc`'s argument will be a reference to
+  // `m{Evaluating,Installing,Waiting,Active}Worker` (not to copy of them).
+  // Additionally, a null check will be performed for each worker before each
+  // call to `aFunc`, so `aFunc` will always get a reference to a non-null
+  // pointer.
+  void ForEachWorker(void (*aFunc)(RefPtr<ServiceWorkerInfo>&));
+
+  void CheckQuotaUsage();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerregistrationinfo_h
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationListener.h b/dom/serviceworkers/ServiceWorkerRegistrationListener.h
new file mode 100644
index 0000000000..2b90f049a8
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationListener.h
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerRegistrationListener_h
+#define mozilla_dom_ServiceWorkerRegistrationListener_h
+
+namespace mozilla::dom {
+
+class ServiceWorkerRegistrationDescriptor;
+
+// Used by ServiceWorkerManager to notify ServiceWorkerRegistrations of
+// updatefound event and invalidating ServiceWorker instances.
+class ServiceWorkerRegistrationListener {
+ public:
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+
+  virtual void UpdateState(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor) = 0;
+
+  virtual void FireUpdateFound() = 0;
+
+  virtual void RegistrationCleared() = 0;
+
+  virtual void GetScope(nsAString& aScope) const = 0;
+
+  virtual bool MatchesDescriptor(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor) = 0;
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_ServiceWorkerRegistrationListener_h */
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationParent.cpp b/dom/serviceworkers/ServiceWorkerRegistrationParent.cpp
new file mode 100644
index 0000000000..430c86a2ce
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationParent.cpp
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistrationParent.h"
+
+#include <utility>
+
+#include "ServiceWorkerRegistrationProxy.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::IPCResult;
+
+void ServiceWorkerRegistrationParent::ActorDestroy(ActorDestroyReason aReason) {
+  if (mProxy) {
+    mProxy->RevokeActor(this);
+    mProxy = nullptr;
+  }
+}
+
+IPCResult ServiceWorkerRegistrationParent::RecvTeardown() {
+  MaybeSendDelete();
+  return IPC_OK();
+}
+
+namespace {
+
+void ResolveUnregister(
+    PServiceWorkerRegistrationParent::UnregisterResolver&& aResolver,
+    bool aSuccess, nsresult aRv) {
+  aResolver(std::tuple<const bool&, const CopyableErrorResult&>(
+      aSuccess, CopyableErrorResult(aRv)));
+}
+
+}  // anonymous namespace
+
+IPCResult ServiceWorkerRegistrationParent::RecvUnregister(
+    UnregisterResolver&& aResolver) {
+  if (!mProxy) {
+    ResolveUnregister(std::move(aResolver), false,
+                      NS_ERROR_DOM_INVALID_STATE_ERR);
+    return IPC_OK();
+  }
+
+  mProxy->Unregister()->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [aResolver](bool aSuccess) mutable {
+        ResolveUnregister(std::move(aResolver), aSuccess, NS_OK);
+      },
+      [aResolver](nsresult aRv) mutable {
+        ResolveUnregister(std::move(aResolver), false, aRv);
+      });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerRegistrationParent::RecvUpdate(
+    const nsACString& aNewestWorkerScriptUrl, UpdateResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(CopyableErrorResult(NS_ERROR_DOM_INVALID_STATE_ERR));
+    return IPC_OK();
+  }
+
+  mProxy->Update(aNewestWorkerScriptUrl)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolver](const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+            aResolver(aDescriptor.ToIPC());
+          },
+          [aResolver](const CopyableErrorResult& aResult) {
+            aResolver(aResult);
+          });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerRegistrationParent::RecvSetNavigationPreloadEnabled(
+    const bool& aEnabled, SetNavigationPreloadEnabledResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(false);
+    return IPC_OK();
+  }
+
+  mProxy->SetNavigationPreloadEnabled(aEnabled)->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [aResolver](bool) { aResolver(true); },
+      [aResolver](nsresult) { aResolver(false); });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerRegistrationParent::RecvSetNavigationPreloadHeader(
+    const nsACString& aHeader, SetNavigationPreloadHeaderResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(false);
+    return IPC_OK();
+  }
+
+  mProxy->SetNavigationPreloadHeader(aHeader)->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [aResolver](bool) { aResolver(true); },
+      [aResolver](nsresult) { aResolver(false); });
+
+  return IPC_OK();
+}
+
+IPCResult ServiceWorkerRegistrationParent::RecvGetNavigationPreloadState(
+    GetNavigationPreloadStateResolver&& aResolver) {
+  if (!mProxy) {
+    aResolver(Nothing());
+    return IPC_OK();
+  }
+
+  mProxy->GetNavigationPreloadState()->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [aResolver](const IPCNavigationPreloadState& aState) {
+        aResolver(Some(aState));
+      },
+      [aResolver](const CopyableErrorResult& aResult) {
+        aResolver(Nothing());
+      });
+
+  return IPC_OK();
+}
+
+ServiceWorkerRegistrationParent::ServiceWorkerRegistrationParent()
+    : mDeleteSent(false) {}
+
+ServiceWorkerRegistrationParent::~ServiceWorkerRegistrationParent() {
+  MOZ_DIAGNOSTIC_ASSERT(!mProxy);
+}
+
+void ServiceWorkerRegistrationParent::Init(
+    const IPCServiceWorkerRegistrationDescriptor& aDescriptor) {
+  MOZ_DIAGNOSTIC_ASSERT(!mProxy);
+  mProxy = new ServiceWorkerRegistrationProxy(
+      ServiceWorkerRegistrationDescriptor(aDescriptor));
+  mProxy->Init(this);
+}
+
+void ServiceWorkerRegistrationParent::MaybeSendDelete() {
+  if (mDeleteSent) {
+    return;
+  }
+  mDeleteSent = true;
+  Unused << Send__delete__(this);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationParent.h b/dom/serviceworkers/ServiceWorkerRegistrationParent.h
new file mode 100644
index 0000000000..5a6d751961
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationParent.h
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerregistrationparent_h__
+#define mozilla_dom_serviceworkerregistrationparent_h__
+
+#include "mozilla/dom/PServiceWorkerRegistrationParent.h"
+
+namespace mozilla::dom {
+
+class IPCServiceWorkerRegistrationDescriptor;
+class ServiceWorkerRegistrationProxy;
+
+class ServiceWorkerRegistrationParent final
+    : public PServiceWorkerRegistrationParent {
+  RefPtr<ServiceWorkerRegistrationProxy> mProxy;
+  bool mDeleteSent;
+
+  ~ServiceWorkerRegistrationParent();
+
+  // PServiceWorkerRegistrationParent
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+  mozilla::ipc::IPCResult RecvTeardown() override;
+
+  mozilla::ipc::IPCResult RecvUnregister(
+      UnregisterResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvUpdate(const nsACString& aNewestWorkerScriptUrl,
+                                     UpdateResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvSetNavigationPreloadEnabled(
+      const bool& aEnabled,
+      SetNavigationPreloadEnabledResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvSetNavigationPreloadHeader(
+      const nsACString& aHeader,
+      SetNavigationPreloadHeaderResolver&& aResolver) override;
+
+  mozilla::ipc::IPCResult RecvGetNavigationPreloadState(
+      GetNavigationPreloadStateResolver&& aResolver) override;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerRegistrationParent, override);
+
+  ServiceWorkerRegistrationParent();
+
+  void Init(const IPCServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  void MaybeSendDelete();
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerregistrationparent_h__
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationProxy.cpp b/dom/serviceworkers/ServiceWorkerRegistrationProxy.cpp
new file mode 100644
index 0000000000..60756b828d
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationProxy.cpp
@@ -0,0 +1,483 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerRegistrationProxy.h"
+
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerRegistrationParent.h"
+#include "ServiceWorkerUnregisterCallback.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::AssertIsOnBackgroundThread;
+
+class ServiceWorkerRegistrationProxy::DelayedUpdate final
+    : public nsITimerCallback,
+      public nsINamed {
+  RefPtr<ServiceWorkerRegistrationProxy> mProxy;
+  RefPtr<ServiceWorkerRegistrationPromise::Private> mPromise;
+  nsCOMPtr<nsITimer> mTimer;
+  nsCString mNewestWorkerScriptUrl;
+
+  ~DelayedUpdate() = default;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSITIMERCALLBACK
+  NS_DECL_NSINAMED
+
+  DelayedUpdate(RefPtr<ServiceWorkerRegistrationProxy>&& aProxy,
+                RefPtr<ServiceWorkerRegistrationPromise::Private>&& aPromise,
+                nsCString&& aNewestWorkerScriptUrl, uint32_t delay);
+
+  void ChainTo(RefPtr<ServiceWorkerRegistrationPromise::Private> aPromise);
+
+  void Reject();
+
+  void SetNewestWorkerScriptUrl(nsCString&& aNewestWorkerScriptUrl);
+};
+
+ServiceWorkerRegistrationProxy::~ServiceWorkerRegistrationProxy() {
+  // Any thread
+  MOZ_DIAGNOSTIC_ASSERT(!mActor);
+  MOZ_DIAGNOSTIC_ASSERT(!mReg);
+}
+
+void ServiceWorkerRegistrationProxy::MaybeShutdownOnBGThread() {
+  AssertIsOnBackgroundThread();
+  if (!mActor) {
+    return;
+  }
+  mActor->MaybeSendDelete();
+}
+
+void ServiceWorkerRegistrationProxy::UpdateStateOnBGThread(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  AssertIsOnBackgroundThread();
+  if (!mActor) {
+    return;
+  }
+  Unused << mActor->SendUpdateState(aDescriptor.ToIPC());
+}
+
+void ServiceWorkerRegistrationProxy::FireUpdateFoundOnBGThread() {
+  AssertIsOnBackgroundThread();
+  if (!mActor) {
+    return;
+  }
+  Unused << mActor->SendFireUpdateFound();
+}
+
+void ServiceWorkerRegistrationProxy::InitOnMainThread() {
+  AssertIsOnMainThread();
+
+  auto scopeExit = MakeScopeExit([&] { MaybeShutdownOnMainThread(); });
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  NS_ENSURE_TRUE_VOID(swm);
+
+  RefPtr<ServiceWorkerRegistrationInfo> reg =
+      swm->GetRegistration(mDescriptor.PrincipalInfo(), mDescriptor.Scope());
+  NS_ENSURE_TRUE_VOID(reg);
+
+  if (reg->Id() != mDescriptor.Id()) {
+    // This registration has already been replaced by another one.
+    return;
+  }
+
+  scopeExit.release();
+
+  mReg = new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
+      "ServiceWorkerRegistrationProxy::mInfo", reg);
+
+  mReg->AddInstance(this, mDescriptor);
+}
+
+void ServiceWorkerRegistrationProxy::MaybeShutdownOnMainThread() {
+  AssertIsOnMainThread();
+
+  if (mDelayedUpdate) {
+    mDelayedUpdate->Reject();
+    mDelayedUpdate = nullptr;
+  }
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      __func__, this, &ServiceWorkerRegistrationProxy::MaybeShutdownOnBGThread);
+
+  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
+}
+
+void ServiceWorkerRegistrationProxy::StopListeningOnMainThread() {
+  AssertIsOnMainThread();
+
+  if (!mReg) {
+    return;
+  }
+
+  mReg->RemoveInstance(this);
+  mReg = nullptr;
+}
+
+void ServiceWorkerRegistrationProxy::UpdateState(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  AssertIsOnMainThread();
+
+  if (mDescriptor == aDescriptor) {
+    return;
+  }
+  mDescriptor = aDescriptor;
+
+  nsCOMPtr<nsIRunnable> r =
+      NewRunnableMethod<ServiceWorkerRegistrationDescriptor>(
+          __func__, this,
+          &ServiceWorkerRegistrationProxy::UpdateStateOnBGThread, aDescriptor);
+
+  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
+}
+
+void ServiceWorkerRegistrationProxy::FireUpdateFound() {
+  AssertIsOnMainThread();
+
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      __func__, this,
+      &ServiceWorkerRegistrationProxy::FireUpdateFoundOnBGThread);
+
+  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
+}
+
+void ServiceWorkerRegistrationProxy::RegistrationCleared() {
+  MaybeShutdownOnMainThread();
+}
+
+void ServiceWorkerRegistrationProxy::GetScope(nsAString& aScope) const {
+  CopyUTF8toUTF16(mDescriptor.Scope(), aScope);
+}
+
+bool ServiceWorkerRegistrationProxy::MatchesDescriptor(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+  AssertIsOnMainThread();
+  return aDescriptor.Id() == mDescriptor.Id() &&
+         aDescriptor.PrincipalInfo() == mDescriptor.PrincipalInfo() &&
+         aDescriptor.Scope() == mDescriptor.Scope();
+}
+
+ServiceWorkerRegistrationProxy::ServiceWorkerRegistrationProxy(
+    const ServiceWorkerRegistrationDescriptor& aDescriptor)
+    : mEventTarget(GetCurrentSerialEventTarget()), mDescriptor(aDescriptor) {}
+
+void ServiceWorkerRegistrationProxy::Init(
+    ServiceWorkerRegistrationParent* aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(aActor);
+  MOZ_DIAGNOSTIC_ASSERT(!mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mEventTarget);
+
+  mActor = aActor;
+
+  // Note, this must be done from a separate Init() method and not in
+  // the constructor.  If done from the constructor the runnable can
+  // execute, complete, and release its reference before the constructor
+  // returns.
+  nsCOMPtr<nsIRunnable> r =
+      NewRunnableMethod("ServiceWorkerRegistrationProxy::Init", this,
+                        &ServiceWorkerRegistrationProxy::InitOnMainThread);
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+}
+
+void ServiceWorkerRegistrationProxy::RevokeActor(
+    ServiceWorkerRegistrationParent* aActor) {
+  AssertIsOnBackgroundThread();
+  MOZ_DIAGNOSTIC_ASSERT(mActor);
+  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
+  mActor = nullptr;
+
+  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
+      __func__, this,
+      &ServiceWorkerRegistrationProxy::StopListeningOnMainThread);
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+}
+
+RefPtr<GenericPromise> ServiceWorkerRegistrationProxy::Unregister() {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationProxy> self = this;
+  RefPtr<GenericPromise::Private> promise =
+      new GenericPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableFunction(__func__, [self, promise]() mutable {
+        nsresult rv = NS_ERROR_DOM_INVALID_STATE_ERR;
+        auto scopeExit = MakeScopeExit([&] { promise->Reject(rv, __func__); });
+
+        NS_ENSURE_TRUE_VOID(self->mReg);
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+
+        RefPtr<UnregisterCallback> cb = new UnregisterCallback(promise);
+
+        rv = swm->Unregister(self->mReg->Principal(), cb,
+                             NS_ConvertUTF8toUTF16(self->mReg->Scope()));
+        NS_ENSURE_SUCCESS_VOID(rv);
+
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+namespace {
+
+class UpdateCallback final : public ServiceWorkerUpdateFinishCallback {
+  RefPtr<ServiceWorkerRegistrationPromise::Private> mPromise;
+
+  ~UpdateCallback() = default;
+
+ public:
+  explicit UpdateCallback(
+      RefPtr<ServiceWorkerRegistrationPromise::Private>&& aPromise)
+      : mPromise(std::move(aPromise)) {
+    MOZ_DIAGNOSTIC_ASSERT(mPromise);
+  }
+
+  void UpdateSucceeded(ServiceWorkerRegistrationInfo* aInfo) override {
+    mPromise->Resolve(aInfo->Descriptor(), __func__);
+  }
+
+  void UpdateFailed(ErrorResult& aResult) override {
+    mPromise->Reject(CopyableErrorResult(aResult), __func__);
+  }
+};
+
+}  // anonymous namespace
+
+NS_IMPL_ISUPPORTS(ServiceWorkerRegistrationProxy::DelayedUpdate,
+                  nsITimerCallback, nsINamed)
+
+ServiceWorkerRegistrationProxy::DelayedUpdate::DelayedUpdate(
+    RefPtr<ServiceWorkerRegistrationProxy>&& aProxy,
+    RefPtr<ServiceWorkerRegistrationPromise::Private>&& aPromise,
+    nsCString&& aNewestWorkerScriptUrl, uint32_t delay)
+    : mProxy(std::move(aProxy)),
+      mPromise(std::move(aPromise)),
+      mNewestWorkerScriptUrl(std::move(aNewestWorkerScriptUrl)) {
+  MOZ_DIAGNOSTIC_ASSERT(mProxy);
+  MOZ_DIAGNOSTIC_ASSERT(mPromise);
+  MOZ_ASSERT(!mNewestWorkerScriptUrl.IsEmpty());
+  mProxy->mDelayedUpdate = this;
+  Result<nsCOMPtr<nsITimer>, nsresult> result =
+      NS_NewTimerWithCallback(this, delay, nsITimer::TYPE_ONE_SHOT);
+  mTimer = result.unwrapOr(nullptr);
+  MOZ_DIAGNOSTIC_ASSERT(mTimer);
+}
+
+void ServiceWorkerRegistrationProxy::DelayedUpdate::ChainTo(
+    RefPtr<ServiceWorkerRegistrationPromise::Private> aPromise) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mProxy->mDelayedUpdate == this);
+  MOZ_ASSERT(mPromise);
+
+  mPromise->ChainTo(aPromise.forget(), __func__);
+}
+
+void ServiceWorkerRegistrationProxy::DelayedUpdate::Reject() {
+  MOZ_DIAGNOSTIC_ASSERT(mPromise);
+  if (mTimer) {
+    mTimer->Cancel();
+    mTimer = nullptr;
+  }
+  mPromise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__);
+}
+
+void ServiceWorkerRegistrationProxy::DelayedUpdate::SetNewestWorkerScriptUrl(
+    nsCString&& aNewestWorkerScriptUrl) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mNewestWorkerScriptUrl = std::move(aNewestWorkerScriptUrl);
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationProxy::DelayedUpdate::Notify(nsITimer* aTimer) {
+  // Already shutting down.
+  if (mProxy->mDelayedUpdate != this) {
+    return NS_OK;
+  }
+
+  auto scopeExit = MakeScopeExit(
+      [&] { mPromise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+  NS_ENSURE_TRUE(mProxy->mReg, NS_ERROR_FAILURE);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  NS_ENSURE_TRUE(swm, NS_ERROR_FAILURE);
+
+  RefPtr<UpdateCallback> cb = new UpdateCallback(std::move(mPromise));
+  swm->Update(mProxy->mReg->Principal(), mProxy->mReg->Scope(),
+              std::move(mNewestWorkerScriptUrl), cb);
+
+  mTimer = nullptr;
+  mProxy->mDelayedUpdate = nullptr;
+
+  scopeExit.release();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrationProxy::DelayedUpdate::GetName(nsACString& aName) {
+  aName.AssignLiteral("ServiceWorkerRegistrationProxy::DelayedUpdate");
+  return NS_OK;
+}
+
+RefPtr<ServiceWorkerRegistrationPromise> ServiceWorkerRegistrationProxy::Update(
+    const nsACString& aNewestWorkerScriptUrl) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationProxy> self = this;
+  RefPtr<ServiceWorkerRegistrationPromise::Private> promise =
+      new ServiceWorkerRegistrationPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__,
+      [self, promise,
+       newestWorkerScriptUrl = nsCString(aNewestWorkerScriptUrl)]() mutable {
+        auto scopeExit = MakeScopeExit(
+            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });
+
+        // Get the delay value for the update
+        NS_ENSURE_TRUE_VOID(self->mReg);
+        uint32_t delay = self->mReg->GetUpdateDelay(false);
+
+        // If the delay value does not equal to 0, create a timer and a timer
+        // callback to perform the delayed update. Otherwise, update directly.
+        if (delay) {
+          if (self->mDelayedUpdate) {
+            // NOTE: if we `ChainTo(),` there will ultimately be a single
+            // update, and this update will resolve all promises that were
+            // issued while the update's timer was ticking down.
+            self->mDelayedUpdate->ChainTo(std::move(promise));
+
+            // Use the "newest newest worker"'s script URL.
+            self->mDelayedUpdate->SetNewestWorkerScriptUrl(
+                std::move(newestWorkerScriptUrl));
+          } else {
+            RefPtr<ServiceWorkerRegistrationProxy::DelayedUpdate> du =
+                new ServiceWorkerRegistrationProxy::DelayedUpdate(
+                    std::move(self), std::move(promise),
+                    std::move(newestWorkerScriptUrl), delay);
+          }
+        } else {
+          RefPtr<ServiceWorkerManager> swm =
+              ServiceWorkerManager::GetInstance();
+          NS_ENSURE_TRUE_VOID(swm);
+
+          RefPtr<UpdateCallback> cb = new UpdateCallback(std::move(promise));
+          swm->Update(self->mReg->Principal(), self->mReg->Scope(),
+                      std::move(newestWorkerScriptUrl), cb);
+        }
+        scopeExit.release();
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<GenericPromise>
+ServiceWorkerRegistrationProxy::SetNavigationPreloadEnabled(
+    const bool& aEnabled) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationProxy> self = this;
+  RefPtr<GenericPromise::Private> promise =
+      new GenericPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableFunction(__func__, [aEnabled, self, promise]() mutable {
+        nsresult rv = NS_ERROR_DOM_INVALID_STATE_ERR;
+        auto scopeExit = MakeScopeExit([&] { promise->Reject(rv, __func__); });
+
+        NS_ENSURE_TRUE_VOID(self->mReg);
+        NS_ENSURE_TRUE_VOID(self->mReg->GetActive());
+
+        auto reg = self->mReg;
+        reg->SetNavigationPreloadEnabled(aEnabled);
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+        swm->StoreRegistration(reg->Principal(), reg);
+
+        scopeExit.release();
+
+        promise->Resolve(true, __func__);
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<GenericPromise>
+ServiceWorkerRegistrationProxy::SetNavigationPreloadHeader(
+    const nsACString& aHeader) {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationProxy> self = this;
+  RefPtr<GenericPromise::Private> promise =
+      new GenericPromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__, [aHeader = nsCString(aHeader), self, promise]() mutable {
+        nsresult rv = NS_ERROR_DOM_INVALID_STATE_ERR;
+        auto scopeExit = MakeScopeExit([&] { promise->Reject(rv, __func__); });
+
+        NS_ENSURE_TRUE_VOID(self->mReg);
+        NS_ENSURE_TRUE_VOID(self->mReg->GetActive());
+
+        auto reg = self->mReg;
+        reg->SetNavigationPreloadHeader(aHeader);
+
+        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+        NS_ENSURE_TRUE_VOID(swm);
+        swm->StoreRegistration(reg->Principal(), reg);
+
+        scopeExit.release();
+
+        promise->Resolve(true, __func__);
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+RefPtr<NavigationPreloadStatePromise>
+ServiceWorkerRegistrationProxy::GetNavigationPreloadState() {
+  AssertIsOnBackgroundThread();
+
+  RefPtr<ServiceWorkerRegistrationProxy> self = this;
+  RefPtr<NavigationPreloadStatePromise::Private> promise =
+      new NavigationPreloadStatePromise::Private(__func__);
+
+  nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableFunction(__func__, [self, promise]() mutable {
+        nsresult rv = NS_ERROR_DOM_INVALID_STATE_ERR;
+        auto scopeExit = MakeScopeExit([&] { promise->Reject(rv, __func__); });
+
+        NS_ENSURE_TRUE_VOID(self->mReg);
+        scopeExit.release();
+
+        promise->Resolve(self->mReg->GetNavigationPreloadState(), __func__);
+      });
+
+  MOZ_ALWAYS_SUCCEEDS(SchedulerGroup::Dispatch(r.forget()));
+
+  return promise;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerRegistrationProxy.h b/dom/serviceworkers/ServiceWorkerRegistrationProxy.h
new file mode 100644
index 0000000000..4253d2f259
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrationProxy.h
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef moz_dom_ServiceWorkerRegistrationProxy_h
+#define moz_dom_ServiceWorkerRegistrationProxy_h
+
+#include "mozilla/dom/PServiceWorkerRegistrationParent.h"
+#include "nsProxyRelease.h"
+#include "ServiceWorkerRegistrationDescriptor.h"
+#include "ServiceWorkerRegistrationListener.h"
+#include "ServiceWorkerUtils.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerRegistrationInfo;
+class ServiceWorkerRegistrationParent;
+
+class ServiceWorkerRegistrationProxy final
+    : public ServiceWorkerRegistrationListener {
+  // Background thread only
+  RefPtr<ServiceWorkerRegistrationParent> mActor;
+
+  // Written on background thread and read on main thread
+  nsCOMPtr<nsISerialEventTarget> mEventTarget;
+
+  // Main thread only
+  ServiceWorkerRegistrationDescriptor mDescriptor;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mReg;
+
+  ~ServiceWorkerRegistrationProxy();
+
+  // Background thread methods
+  void MaybeShutdownOnBGThread();
+
+  void UpdateStateOnBGThread(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  void FireUpdateFoundOnBGThread();
+
+  // Main thread methods
+  void InitOnMainThread();
+
+  void MaybeShutdownOnMainThread();
+
+  void StopListeningOnMainThread();
+
+  // The timer callback to perform the delayed update
+  class DelayedUpdate;
+  RefPtr<DelayedUpdate> mDelayedUpdate;
+
+  // ServiceWorkerRegistrationListener interface
+  void UpdateState(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor) override;
+
+  void FireUpdateFound() override;
+
+  void RegistrationCleared() override;
+
+  void GetScope(nsAString& aScope) const override;
+
+  bool MatchesDescriptor(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor) override;
+
+ public:
+  explicit ServiceWorkerRegistrationProxy(
+      const ServiceWorkerRegistrationDescriptor& aDescriptor);
+
+  void Init(ServiceWorkerRegistrationParent* aActor);
+
+  void RevokeActor(ServiceWorkerRegistrationParent* aActor);
+
+  RefPtr<GenericPromise> Unregister();
+
+  RefPtr<ServiceWorkerRegistrationPromise> Update(
+      const nsACString& aNewestWorkerScriptUrl);
+
+  RefPtr<GenericPromise> SetNavigationPreloadEnabled(const bool& aEnabled);
+
+  RefPtr<GenericPromise> SetNavigationPreloadHeader(const nsACString& aHeader);
+
+  RefPtr<NavigationPreloadStatePromise> GetNavigationPreloadState();
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerRegistrationProxy,
+                                        override);
+};
+
+}  // namespace mozilla::dom
+
+#endif  // moz_dom_ServiceWorkerRegistrationProxy_h
diff --git a/dom/serviceworkers/ServiceWorkerScriptCache.cpp b/dom/serviceworkers/ServiceWorkerScriptCache.cpp
new file mode 100644
index 0000000000..f1569ffe5f
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerScriptCache.cpp
@@ -0,0 +1,1508 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerScriptCache.h"
+
+#include "js/Array.h"               // JS::GetArrayLength
+#include "js/PropertyAndElement.h"  // JS_GetElement
+#include "js/Utility.h"             // JS::FreePolicy
+#include "mozilla/TaskQueue.h"
+#include "mozilla/Unused.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/CacheBinding.h"
+#include "mozilla/dom/cache/CacheStorage.h"
+#include "mozilla/dom/cache/Cache.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/PromiseWorkerProxy.h"
+#include "mozilla/dom/ScriptLoader.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "mozilla/net/CookieJarSettings.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_extensions.h"
+#include "nsICacheInfoChannel.h"
+#include "nsIHttpChannel.h"
+#include "nsIStreamLoader.h"
+#include "nsIThreadRetargetableRequest.h"
+#include "nsIUUIDGenerator.h"
+#include "nsIXPConnect.h"
+
+#include "nsIInputStreamPump.h"
+#include "nsIPrincipal.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsContentUtils.h"
+#include "nsNetUtil.h"
+#include "ServiceWorkerManager.h"
+#include "nsStringStream.h"
+
+using mozilla::dom::cache::Cache;
+using mozilla::dom::cache::CacheStorage;
+using mozilla::ipc::PrincipalInfo;
+
+namespace mozilla::dom::serviceWorkerScriptCache {
+
+namespace {
+
+already_AddRefed<CacheStorage> CreateCacheStorage(JSContext* aCx,
+                                                  nsIPrincipal* aPrincipal,
+                                                  ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  nsIXPConnect* xpc = nsContentUtils::XPConnect();
+  MOZ_ASSERT(xpc, "This should never be null!");
+  JS::Rooted<JSObject*> sandbox(aCx);
+  aRv = xpc->CreateSandbox(aCx, aPrincipal, sandbox.address());
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  // This is called when the JSContext is not in a realm, so CreateSandbox
+  // returned an unwrapped global.
+  MOZ_ASSERT(JS_IsGlobalObject(sandbox));
+
+  nsCOMPtr<nsIGlobalObject> sandboxGlobalObject = xpc::NativeGlobal(sandbox);
+  if (!sandboxGlobalObject) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  // We assume private browsing is not enabled here.  The ScriptLoader
+  // explicitly fails for private browsing so there should never be
+  // a service worker running in private browsing mode.  Therefore if
+  // we are purging scripts or running a comparison algorithm we cannot
+  // be in private browsing.
+  //
+  // Also, bypass the CacheStorage trusted origin checks.  The ServiceWorker
+  // has validated the origin prior to this point.  All the information
+  // to revalidate is not available now.
+  return CacheStorage::CreateOnMainThread(cache::CHROME_ONLY_NAMESPACE,
+                                          sandboxGlobalObject, aPrincipal,
+                                          true /* force trusted origin */, aRv);
+}
+
+class CompareManager;
+class CompareCache;
+
+// This class downloads a URL from the network, compare the downloaded script
+// with an existing cache if provided, and report to CompareManager via calling
+// ComparisonFinished().
+class CompareNetwork final : public nsIStreamLoaderObserver,
+                             public nsIRequestObserver {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISTREAMLOADEROBSERVER
+  NS_DECL_NSIREQUESTOBSERVER
+
+  CompareNetwork(CompareManager* aManager,
+                 ServiceWorkerRegistrationInfo* aRegistration,
+                 bool aIsMainScript)
+      : mManager(aManager),
+        mRegistration(aRegistration),
+        mInternalHeaders(new InternalHeaders()),
+        mLoadFlags(nsIChannel::LOAD_BYPASS_SERVICE_WORKER),
+        mState(WaitingForInitialization),
+        mNetworkResult(NS_OK),
+        mCacheResult(NS_OK),
+        mIsMainScript(aIsMainScript),
+        mIsFromCache(false) {
+    MOZ_ASSERT(aManager);
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  nsresult Initialize(nsIPrincipal* aPrincipal, const nsAString& aURL,
+                      Cache* const aCache);
+
+  void Abort();
+
+  void NetworkFinish(nsresult aRv);
+
+  void CacheFinish(nsresult aRv);
+
+  const nsString& URL() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mURL;
+  }
+
+  const nsString& Buffer() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mBuffer;
+  }
+
+  const ChannelInfo& GetChannelInfo() const { return mChannelInfo; }
+
+  already_AddRefed<InternalHeaders> GetInternalHeaders() const {
+    RefPtr<InternalHeaders> internalHeaders = mInternalHeaders;
+    return internalHeaders.forget();
+  }
+
+  UniquePtr<PrincipalInfo> TakePrincipalInfo() {
+    return std::move(mPrincipalInfo);
+  }
+
+  bool Succeeded() const { return NS_SUCCEEDED(mNetworkResult); }
+
+  const nsTArray<nsCString>& URLList() const { return mURLList; }
+
+ private:
+  ~CompareNetwork() {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(!mCC);
+  }
+
+  void Finish();
+
+  nsresult SetPrincipalInfo(nsIChannel* aChannel);
+
+  RefPtr<CompareManager> mManager;
+  RefPtr<CompareCache> mCC;
+  RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
+
+  nsCOMPtr<nsIChannel> mChannel;
+  nsString mBuffer;
+  nsString mURL;
+  ChannelInfo mChannelInfo;
+  RefPtr<InternalHeaders> mInternalHeaders;
+  UniquePtr<PrincipalInfo> mPrincipalInfo;
+  nsTArray<nsCString> mURLList;
+
+  nsCString mMaxScope;
+  nsLoadFlags mLoadFlags;
+
+  enum {
+    WaitingForInitialization,
+    WaitingForBothFinished,
+    WaitingForNetworkFinished,
+    WaitingForCacheFinished,
+    Finished
+  } mState;
+
+  nsresult mNetworkResult;
+  nsresult mCacheResult;
+
+  const bool mIsMainScript;
+  bool mIsFromCache;
+};
+
+NS_IMPL_ISUPPORTS(CompareNetwork, nsIStreamLoaderObserver, nsIRequestObserver)
+
+// This class gets a cached Response from the CacheStorage and then it calls
+// CacheFinish() in the CompareNetwork.
+class CompareCache final : public PromiseNativeHandler,
+                           public nsIStreamLoaderObserver {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISTREAMLOADEROBSERVER
+
+  explicit CompareCache(CompareNetwork* aCN)
+      : mCN(aCN), mState(WaitingForInitialization), mInCache(false) {
+    MOZ_ASSERT(aCN);
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  nsresult Initialize(Cache* const aCache, const nsAString& aURL);
+
+  void Finish(nsresult aStatus, bool aInCache);
+
+  void Abort();
+
+  virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override;
+
+  virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override;
+
+  const nsString& Buffer() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mBuffer;
+  }
+
+  bool InCache() { return mInCache; }
+
+ private:
+  ~CompareCache() { MOZ_ASSERT(NS_IsMainThread()); }
+
+  void ManageValueResult(JSContext* aCx, JS::Handle<JS::Value> aValue);
+
+  RefPtr<CompareNetwork> mCN;
+  nsCOMPtr<nsIInputStreamPump> mPump;
+
+  nsString mURL;
+  nsString mBuffer;
+
+  enum {
+    WaitingForInitialization,
+    WaitingForScript,
+    Finished,
+  } mState;
+
+  bool mInCache;
+};
+
+NS_IMPL_ISUPPORTS(CompareCache, nsIStreamLoaderObserver)
+
+class CompareManager final : public PromiseNativeHandler {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit CompareManager(ServiceWorkerRegistrationInfo* aRegistration,
+                          CompareCallback* aCallback)
+      : mRegistration(aRegistration),
+        mCallback(aCallback),
+        mLoadFlags(nsIChannel::LOAD_BYPASS_SERVICE_WORKER),
+        mState(WaitingForInitialization),
+        mPendingCount(0),
+        mOnFailure(OnFailure::DoNothing),
+        mAreScriptsEqual(true) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aRegistration);
+  }
+
+  nsresult Initialize(nsIPrincipal* aPrincipal, const nsAString& aURL,
+                      const nsAString& aCacheName);
+
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+  CacheStorage* CacheStorage_() {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCacheStorage);
+    return mCacheStorage;
+  }
+
+  void ComparisonFinished(nsresult aStatus, bool aIsMainScript, bool aIsEqual,
+                          const nsACString& aMaxScope, nsLoadFlags aLoadFlags) {
+    MOZ_ASSERT(NS_IsMainThread());
+    if (mState == Finished) {
+      return;
+    }
+
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForScriptOrComparisonResult);
+
+    if (NS_WARN_IF(NS_FAILED(aStatus))) {
+      Fail(aStatus);
+      return;
+    }
+
+    mAreScriptsEqual = mAreScriptsEqual && aIsEqual;
+
+    if (aIsMainScript) {
+      mMaxScope = aMaxScope;
+      mLoadFlags = aLoadFlags;
+    }
+
+    // Check whether all CompareNetworks finished their jobs.
+    MOZ_DIAGNOSTIC_ASSERT(mPendingCount > 0);
+    if (--mPendingCount) {
+      return;
+    }
+
+    if (mAreScriptsEqual) {
+      MOZ_ASSERT(mCallback);
+      mCallback->ComparisonResult(aStatus, true /* aSameScripts */, mOnFailure,
+                                  u""_ns, mMaxScope, mLoadFlags);
+      Cleanup();
+      return;
+    }
+
+    // Write to Cache so ScriptLoader reads succeed.
+    WriteNetworkBufferToNewCache();
+  }
+
+ private:
+  ~CompareManager() {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCNList.Length() == 0);
+  }
+
+  void Fail(nsresult aStatus);
+
+  void Cleanup();
+
+  nsresult FetchScript(const nsAString& aURL, bool aIsMainScript,
+                       Cache* const aCache = nullptr) {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization ||
+                          mState == WaitingForScriptOrComparisonResult);
+
+    RefPtr<CompareNetwork> cn =
+        new CompareNetwork(this, mRegistration, aIsMainScript);
+    mCNList.AppendElement(cn);
+    mPendingCount += 1;
+
+    nsresult rv = cn->Initialize(mPrincipal, aURL, aCache);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    return NS_OK;
+  }
+
+  void ManageOldCache(JSContext* aCx, JS::Handle<JS::Value> aValue) {
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForExistingOpen);
+
+    // RAII Cleanup when fails.
+    nsresult rv = NS_ERROR_FAILURE;
+    auto guard = MakeScopeExit([&] { Fail(rv); });
+
+    if (NS_WARN_IF(!aValue.isObject())) {
+      return;
+    }
+
+    MOZ_ASSERT(!mOldCache);
+    JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+    if (NS_WARN_IF(!obj) ||
+        NS_WARN_IF(NS_FAILED(UNWRAP_OBJECT(Cache, obj, mOldCache)))) {
+      return;
+    }
+
+    Optional<RequestOrUSVString> request;
+    CacheQueryOptions options;
+    ErrorResult error;
+    RefPtr<Promise> promise = mOldCache->Keys(aCx, request, options, error);
+    if (NS_WARN_IF(error.Failed())) {
+      // No exception here because there are no ReadableStreams involved here.
+      MOZ_ASSERT(!error.IsJSException());
+      rv = error.StealNSResult();
+      return;
+    }
+
+    mState = WaitingForExistingKeys;
+    promise->AppendNativeHandler(this);
+    guard.release();
+  }
+
+  void ManageOldKeys(JSContext* aCx, JS::Handle<JS::Value> aValue) {
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForExistingKeys);
+
+    // RAII Cleanup when fails.
+    nsresult rv = NS_ERROR_FAILURE;
+    auto guard = MakeScopeExit([&] { Fail(rv); });
+
+    if (NS_WARN_IF(!aValue.isObject())) {
+      return;
+    }
+
+    JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+    if (NS_WARN_IF(!obj)) {
+      return;
+    }
+
+    uint32_t len = 0;
+    if (!JS::GetArrayLength(aCx, obj, &len)) {
+      return;
+    }
+
+    // Fetch and compare the source scripts.
+    MOZ_ASSERT(mPendingCount == 0);
+
+    mState = WaitingForScriptOrComparisonResult;
+
+    bool hasMainScript = false;
+    AutoTArray<nsString, 8> urlList;
+
+    // Extract the list of URLs in the old cache.
+    for (uint32_t i = 0; i < len; ++i) {
+      JS::Rooted<JS::Value> val(aCx);
+      if (NS_WARN_IF(!JS_GetElement(aCx, obj, i, &val)) ||
+          NS_WARN_IF(!val.isObject())) {
+        return;
+      }
+
+      Request* request;
+      JS::Rooted<JSObject*> requestObj(aCx, &val.toObject());
+      if (NS_WARN_IF(NS_FAILED(UNWRAP_OBJECT(Request, &requestObj, request)))) {
+        return;
+      };
+
+      nsString url;
+      request->GetUrl(url);
+
+      if (!hasMainScript && url == mURL) {
+        hasMainScript = true;
+      }
+
+      urlList.AppendElement(url);
+    }
+
+    // If the main script is missing, then something has gone wrong.  We
+    // will try to continue with the update process to trigger a new
+    // installation.  If that fails, however, then uninstall the registration
+    // because it is broken in a way that cannot be fixed.
+    if (!hasMainScript) {
+      mOnFailure = OnFailure::Uninstall;
+    }
+
+    // Always make sure to fetch the main script.  If the old cache has
+    // no entries or the main script entry is missing, then the loop below
+    // may not trigger it.  This should not really happen, but we handle it
+    // gracefully if it does occur.  Its possible the bad cache state is due
+    // to a crash or shutdown during an update, etc.
+    rv = FetchScript(mURL, true /* aIsMainScript */, mOldCache);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+
+    for (const auto& url : urlList) {
+      // We explicitly start the fetch for the main script above.
+      if (mURL == url) {
+        continue;
+      }
+
+      rv = FetchScript(url, false /* aIsMainScript */, mOldCache);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return;
+      }
+    }
+
+    guard.release();
+  }
+
+  void ManageNewCache(JSContext* aCx, JS::Handle<JS::Value> aValue) {
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForOpen);
+
+    // RAII Cleanup when fails.
+    nsresult rv = NS_ERROR_FAILURE;
+    auto guard = MakeScopeExit([&] { Fail(rv); });
+
+    if (NS_WARN_IF(!aValue.isObject())) {
+      return;
+    }
+
+    JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+    if (NS_WARN_IF(!obj)) {
+      return;
+    }
+
+    Cache* cache = nullptr;
+    rv = UNWRAP_OBJECT(Cache, &obj, cache);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+
+    // Just to be safe.
+    RefPtr<Cache> kungfuDeathGrip = cache;
+
+    MOZ_ASSERT(mPendingCount == 0);
+    for (uint32_t i = 0; i < mCNList.Length(); ++i) {
+      // We bail out immediately when something goes wrong.
+      rv = WriteToCache(aCx, cache, mCNList[i]);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return;
+      }
+    }
+
+    mState = WaitingForPut;
+    guard.release();
+  }
+
+  void WriteNetworkBufferToNewCache() {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mCNList.Length() != 0);
+    MOZ_ASSERT(mCacheStorage);
+    MOZ_ASSERT(mNewCacheName.IsEmpty());
+
+    ErrorResult result;
+    result = serviceWorkerScriptCache::GenerateCacheName(mNewCacheName);
+    if (NS_WARN_IF(result.Failed())) {
+      MOZ_ASSERT(!result.IsErrorWithMessage());
+      Fail(result.StealNSResult());
+      return;
+    }
+
+    RefPtr<Promise> cacheOpenPromise =
+        mCacheStorage->Open(mNewCacheName, result);
+    if (NS_WARN_IF(result.Failed())) {
+      MOZ_ASSERT(!result.IsErrorWithMessage());
+      Fail(result.StealNSResult());
+      return;
+    }
+
+    mState = WaitingForOpen;
+    cacheOpenPromise->AppendNativeHandler(this);
+  }
+
+  nsresult WriteToCache(JSContext* aCx, Cache* aCache, CompareNetwork* aCN) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aCache);
+    MOZ_ASSERT(aCN);
+    MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForOpen);
+
+    // We don't have to save any information from a failed CompareNetwork.
+    if (!aCN->Succeeded()) {
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsIInputStream> body;
+    nsresult rv = NS_NewCStringInputStream(
+        getter_AddRefs(body), NS_ConvertUTF16toUTF8(aCN->Buffer()));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    SafeRefPtr<InternalResponse> ir =
+        MakeSafeRefPtr<InternalResponse>(200, "OK"_ns);
+    ir->SetBody(body, aCN->Buffer().Length());
+    ir->SetURLList(aCN->URLList());
+
+    ir->InitChannelInfo(aCN->GetChannelInfo());
+    UniquePtr<PrincipalInfo> principalInfo = aCN->TakePrincipalInfo();
+    if (principalInfo) {
+      ir->SetPrincipalInfo(std::move(principalInfo));
+    }
+
+    RefPtr<InternalHeaders> internalHeaders = aCN->GetInternalHeaders();
+    ir->Headers()->Fill(*(internalHeaders.get()), IgnoreErrors());
+
+    RefPtr<Response> response =
+        new Response(aCache->GetGlobalObject(), std::move(ir), nullptr);
+
+    RequestOrUSVString request;
+    request.SetAsUSVString().ShareOrDependUpon(aCN->URL());
+
+    // For now we have to wait until the Put Promise is fulfilled before we can
+    // continue since Cache does not yet support starting a read that is being
+    // written to.
+    ErrorResult result;
+    RefPtr<Promise> cachePromise = aCache->Put(aCx, request, *response, result);
+    result.WouldReportJSException();
+    if (NS_WARN_IF(result.Failed())) {
+      // No exception here because there are no ReadableStreams involved here.
+      MOZ_ASSERT(!result.IsJSException());
+      MOZ_ASSERT(!result.IsErrorWithMessage());
+      return result.StealNSResult();
+    }
+
+    mPendingCount += 1;
+    cachePromise->AppendNativeHandler(this);
+    return NS_OK;
+  }
+
+  RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
+  RefPtr<CompareCallback> mCallback;
+  RefPtr<CacheStorage> mCacheStorage;
+
+  nsTArray<RefPtr<CompareNetwork>> mCNList;
+
+  nsString mURL;
+  RefPtr<nsIPrincipal> mPrincipal;
+
+  // Used for the old cache where saves the old source scripts.
+  RefPtr<Cache> mOldCache;
+
+  // Only used if the network script has changed and needs to be cached.
+  nsString mNewCacheName;
+
+  nsCString mMaxScope;
+  nsLoadFlags mLoadFlags;
+
+  enum {
+    WaitingForInitialization,
+    WaitingForExistingOpen,
+    WaitingForExistingKeys,
+    WaitingForScriptOrComparisonResult,
+    WaitingForOpen,
+    WaitingForPut,
+    Finished
+  } mState;
+
+  uint32_t mPendingCount;
+  OnFailure mOnFailure;
+  bool mAreScriptsEqual;
+};
+
+NS_IMPL_ISUPPORTS0(CompareManager)
+
+nsresult CompareNetwork::Initialize(nsIPrincipal* aPrincipal,
+                                    const nsAString& aURL,
+                                    Cache* const aCache) {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), aURL);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mURL = aURL;
+  mURLList.AppendElement(NS_ConvertUTF16toUTF8(mURL));
+
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  rv = NS_NewLoadGroup(getter_AddRefs(loadGroup), aPrincipal);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Update LoadFlags for propagating to ServiceWorkerInfo.
+  mLoadFlags = nsIChannel::LOAD_BYPASS_SERVICE_WORKER;
+
+  ServiceWorkerUpdateViaCache uvc = mRegistration->GetUpdateViaCache();
+  if (uvc == ServiceWorkerUpdateViaCache::None ||
+      (uvc == ServiceWorkerUpdateViaCache::Imports && mIsMainScript)) {
+    mLoadFlags |= nsIRequest::VALIDATE_ALWAYS;
+  }
+
+  if (mRegistration->IsLastUpdateCheckTimeOverOneDay()) {
+    mLoadFlags |= nsIRequest::LOAD_BYPASS_CACHE;
+  }
+
+  // Different settings are needed for fetching imported scripts, since they
+  // might be cross-origin scripts.
+  uint32_t secFlags =
+      mIsMainScript ? nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED
+                    : nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT;
+
+  nsContentPolicyType contentPolicyType =
+      mIsMainScript ? nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER
+                    : nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS;
+
+  // Create a new cookieJarSettings.
+  nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+      mozilla::net::CookieJarSettings::Create(aPrincipal);
+
+  // Populate the partitionKey by using the given prinicpal. The ServiceWorkers
+  // are using the foreign partitioned principal, so we can get the partitionKey
+  // from it and the partitionKey will only exist if it's in the third-party
+  // context. In first-party context, we can still use the uri to set the
+  // partitionKey.
+  if (!aPrincipal->OriginAttributesRef().mPartitionKey.IsEmpty()) {
+    net::CookieJarSettings::Cast(cookieJarSettings)
+        ->SetPartitionKey(aPrincipal->OriginAttributesRef().mPartitionKey);
+  } else {
+    net::CookieJarSettings::Cast(cookieJarSettings)->SetPartitionKey(uri);
+  }
+
+  // Note that because there is no "serviceworker" RequestContext type, we can
+  // use the TYPE_INTERNAL_SCRIPT content policy types when loading a service
+  // worker.
+  rv = NS_NewChannel(getter_AddRefs(mChannel), uri, aPrincipal, secFlags,
+                     contentPolicyType, cookieJarSettings,
+                     nullptr /* aPerformanceStorage */, loadGroup,
+                     nullptr /* aCallbacks */, mLoadFlags);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel);
+  if (httpChannel) {
+    // Spec says no redirects allowed for top-level SW scripts.
+    if (mIsMainScript) {
+      rv = httpChannel->SetRedirectionLimit(0);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+    }
+
+    rv = httpChannel->SetRequestHeader("Service-Worker"_ns, "script"_ns,
+                                       /* merge */ false);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+
+  nsCOMPtr<nsIStreamLoader> loader;
+  rv = NS_NewStreamLoader(getter_AddRefs(loader), this, this);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mChannel->AsyncOpen(loader);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // If we do have an existing cache to compare with.
+  if (aCache) {
+    mCC = new CompareCache(this);
+    rv = mCC->Initialize(aCache, aURL);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      Abort();
+      return rv;
+    }
+
+    mState = WaitingForBothFinished;
+    return NS_OK;
+  }
+
+  mState = WaitingForNetworkFinished;
+  return NS_OK;
+}
+
+void CompareNetwork::Finish() {
+  if (mState == Finished) {
+    return;
+  }
+
+  bool same = true;
+  nsresult rv = NS_OK;
+
+  // mNetworkResult is prior to mCacheResult, since it's needed for reporting
+  // various errors to web content.
+  if (NS_FAILED(mNetworkResult)) {
+    // An imported script could become offline, since it might no longer be
+    // needed by the new importing script. In that case, the importing script
+    // must be different, and thus, it's okay to report same script found here.
+    rv = mIsMainScript ? mNetworkResult : NS_OK;
+    same = true;
+  } else if (mCC && NS_FAILED(mCacheResult)) {
+    rv = mCacheResult;
+  } else {  // Both passed.
+    same = mCC && mCC->InCache() && mCC->Buffer().Equals(mBuffer);
+  }
+
+  mManager->ComparisonFinished(rv, mIsMainScript, same, mMaxScope, mLoadFlags);
+
+  // We have done with the CompareCache.
+  mCC = nullptr;
+}
+
+void CompareNetwork::NetworkFinish(nsresult aRv) {
+  MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForBothFinished ||
+                        mState == WaitingForNetworkFinished);
+
+  mNetworkResult = aRv;
+
+  if (mState == WaitingForBothFinished) {
+    mState = WaitingForCacheFinished;
+    return;
+  }
+
+  if (mState == WaitingForNetworkFinished) {
+    Finish();
+    return;
+  }
+}
+
+void CompareNetwork::CacheFinish(nsresult aRv) {
+  MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForBothFinished ||
+                        mState == WaitingForCacheFinished);
+
+  mCacheResult = aRv;
+
+  if (mState == WaitingForBothFinished) {
+    mState = WaitingForNetworkFinished;
+    return;
+  }
+
+  if (mState == WaitingForCacheFinished) {
+    Finish();
+    return;
+  }
+}
+
+void CompareNetwork::Abort() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState != Finished) {
+    mState = Finished;
+
+    MOZ_ASSERT(mChannel);
+    mChannel->CancelWithReason(NS_BINDING_ABORTED, "CompareNetwork::Abort"_ns);
+    mChannel = nullptr;
+
+    if (mCC) {
+      mCC->Abort();
+      mCC = nullptr;
+    }
+  }
+}
+
+NS_IMETHODIMP
+CompareNetwork::OnStartRequest(nsIRequest* aRequest) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState == Finished) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
+  MOZ_ASSERT_IF(mIsMainScript, channel == mChannel);
+  mChannel = channel;
+
+  MOZ_ASSERT(!mChannelInfo.IsInitialized());
+  mChannelInfo.InitFromChannel(mChannel);
+
+  nsresult rv = SetPrincipalInfo(mChannel);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mInternalHeaders->FillResponseHeaders(mChannel);
+
+  nsCOMPtr<nsICacheInfoChannel> cacheChannel(do_QueryInterface(channel));
+  if (cacheChannel) {
+    cacheChannel->IsFromCache(&mIsFromCache);
+  }
+
+  return NS_OK;
+}
+
+nsresult CompareNetwork::SetPrincipalInfo(nsIChannel* aChannel) {
+  nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
+  if (!ssm) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIPrincipal> channelPrincipal;
+  nsresult rv = ssm->GetChannelResultPrincipal(
+      aChannel, getter_AddRefs(channelPrincipal));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  UniquePtr<PrincipalInfo> principalInfo = MakeUnique<PrincipalInfo>();
+  rv = PrincipalToPrincipalInfo(channelPrincipal, principalInfo.get());
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mPrincipalInfo = std::move(principalInfo);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+CompareNetwork::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
+  // Nothing to do here!
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+CompareNetwork::OnStreamComplete(nsIStreamLoader* aLoader,
+                                 nsISupports* aContext, nsresult aStatus,
+                                 uint32_t aLen, const uint8_t* aString) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState == Finished) {
+    return NS_OK;
+  }
+
+  nsresult rv = NS_ERROR_FAILURE;
+  auto guard = MakeScopeExit([&] { NetworkFinish(rv); });
+
+  if (NS_WARN_IF(NS_FAILED(aStatus))) {
+    rv = (aStatus == NS_ERROR_REDIRECT_LOOP) ? NS_ERROR_DOM_SECURITY_ERR
+                                             : aStatus;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIRequest> request;
+  rv = aLoader->GetRequest(getter_AddRefs(request));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
+  MOZ_ASSERT(channel, "How come we don't have any channel?");
+
+  nsCOMPtr<nsIURI> uri;
+  channel->GetOriginalURI(getter_AddRefs(uri));
+  bool isExtension = uri->SchemeIs("moz-extension");
+
+  if (isExtension &&
+      !StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup()) {
+    // Return earlier with error is the worker script is a moz-extension url
+    // but the feature isn't enabled by prefs.
+    return NS_ERROR_FAILURE;
+  }
+
+  if (isExtension) {
+    // NOTE: trying to register any moz-extension use that doesn't ends
+    // with .js/.jsm/.mjs seems to be already completing with an error
+    // in aStatus and they never reach this point.
+
+    // TODO: look into avoid duplicated parts that could be shared with the HTTP
+    // channel scenario.
+    nsCOMPtr<nsIURI> channelURL;
+    rv = channel->GetURI(getter_AddRefs(channelURL));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    nsCString channelURLSpec;
+    MOZ_ALWAYS_SUCCEEDS(channelURL->GetSpec(channelURLSpec));
+
+    // Append the final URL (which for an extension worker script is going to
+    // be a file or jar url).
+    MOZ_DIAGNOSTIC_ASSERT(!mURLList.IsEmpty());
+    if (channelURLSpec != mURLList[0]) {
+      mURLList.AppendElement(channelURLSpec);
+    }
+
+    UniquePtr<char16_t[], JS::FreePolicy> buffer;
+    size_t len = 0;
+
+    rv = ScriptLoader::ConvertToUTF16(channel, aString, aLen, u"UTF-8"_ns,
+                                      nullptr, buffer, len);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    mBuffer.Adopt(buffer.release(), len);
+
+    rv = NS_OK;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(request);
+
+  // Main scripts cannot be redirected successfully, however extensions
+  // may successfuly redirect imported scripts to a moz-extension url
+  // (if listed in the web_accessible_resources manifest property).
+  //
+  // When the service worker is initially registered the imported scripts
+  // will be loaded from the child process (see dom/workers/ScriptLoader.cpp)
+  // and in that case this method will only be called for the main script.
+  //
+  // When a registered worker is loaded again (e.g. when the webpage calls
+  // the ServiceWorkerRegistration's update method):
+  //
+  // - both the main and imported scripts are loaded by the
+  //   CompareManager::FetchScript
+  // - the update requests for the imported scripts will also be calling this
+  //   method and we should expect scripts redirected to an extension script
+  //   to have a null httpChannel.
+  //
+  // The request that triggers this method is:
+  //
+  // - the one that is coming from the network (which may be intercepted by
+  //   WebRequest listeners in extensions and redirected to a web_accessible
+  //   moz-extension url)
+  // - it will then be compared with a previous response that we may have
+  //   in the cache
+  //
+  // When the next service worker update occurs, if the request (for an imported
+  // script) is not redirected by an extension the cache entry is invalidated
+  // and a network request is triggered for the import.
+  if (!httpChannel) {
+    // Redirecting a service worker main script should fail before reaching this
+    // method.
+    // If a main script is somehow redirected, the diagnostic assert will crash
+    // in non-release builds.  Release builds will return an explicit error.
+    MOZ_DIAGNOSTIC_ASSERT(!mIsMainScript,
+                          "Unexpected ServiceWorker main script redirected");
+    if (mIsMainScript) {
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    nsCOMPtr<nsIPrincipal> channelPrincipal;
+
+    nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
+    if (!ssm) {
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    nsresult rv = ssm->GetChannelResultPrincipal(
+        channel, getter_AddRefs(channelPrincipal));
+
+    // An extension did redirect a non-MainScript request to a moz-extension url
+    // (in that case the originalURL is the resolved jar URI and so we have to
+    // look to the channel principal instead).
+    if (channelPrincipal->SchemeIs("moz-extension")) {
+      UniquePtr<char16_t[], JS::FreePolicy> buffer;
+      size_t len = 0;
+
+      rv = ScriptLoader::ConvertToUTF16(channel, aString, aLen, u"UTF-8"_ns,
+                                        nullptr, buffer, len);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      mBuffer.Adopt(buffer.release(), len);
+
+      return NS_OK;
+    }
+
+    // Make non-release and debug builds to crash if this happens and fail
+    // explicitly on release builds.
+    MOZ_DIAGNOSTIC_ASSERT(false,
+                          "ServiceWorker imported script redirected to an url "
+                          "with an unexpected scheme");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  bool requestSucceeded;
+  rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_OK;
+  }
+
+  if (NS_WARN_IF(!requestSucceeded)) {
+    // Get the stringified numeric status code, not statusText which could be
+    // something misleading like OK for a 404.
+    uint32_t status = 0;
+    Unused << httpChannel->GetResponseStatus(
+        &status);  // don't care if this fails, use 0.
+    nsAutoString statusAsText;
+    statusAsText.AppendInt(status);
+
+    ServiceWorkerManager::LocalizeAndReportToAllClients(
+        mRegistration->Scope(), "ServiceWorkerRegisterNetworkError",
+        nsTArray<nsString>{NS_ConvertUTF8toUTF16(mRegistration->Scope()),
+                           statusAsText, mURL});
+
+    rv = NS_ERROR_FAILURE;
+    return NS_OK;
+  }
+
+  // Note: we explicitly don't check for the return value here, because the
+  // absence of the header is not an error condition.
+  Unused << httpChannel->GetResponseHeader("Service-Worker-Allowed"_ns,
+                                           mMaxScope);
+
+  // [9.2 Update]4.13, If response's cache state is not "local",
+  // set registration's last update check time to the current time
+  if (!mIsFromCache) {
+    mRegistration->RefreshLastUpdateCheckTime();
+  }
+
+  nsAutoCString mimeType;
+  rv = httpChannel->GetContentType(mimeType);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    // We should only end up here if !mResponseHead in the channel.  If headers
+    // were received but no content type was specified, we'll be given
+    // UNKNOWN_CONTENT_TYPE "application/x-unknown-content-type" and so fall
+    // into the next case with its better error message.
+    rv = NS_ERROR_DOM_SECURITY_ERR;
+    return rv;
+  }
+
+  if (mimeType.IsEmpty() ||
+      !nsContentUtils::IsJavascriptMIMEType(NS_ConvertUTF8toUTF16(mimeType))) {
+    ServiceWorkerManager::LocalizeAndReportToAllClients(
+        mRegistration->Scope(), "ServiceWorkerRegisterMimeTypeError2",
+        nsTArray<nsString>{NS_ConvertUTF8toUTF16(mRegistration->Scope()),
+                           NS_ConvertUTF8toUTF16(mimeType), mURL});
+    rv = NS_ERROR_DOM_SECURITY_ERR;
+    return rv;
+  }
+
+  nsCOMPtr<nsIURI> channelURL;
+  rv = httpChannel->GetURI(getter_AddRefs(channelURL));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCString channelURLSpec;
+  MOZ_ALWAYS_SUCCEEDS(channelURL->GetSpec(channelURLSpec));
+
+  // Append the final URL if its different from the original
+  // request URL.  This lets us note that a redirect occurred
+  // even though we don't track every redirect URL here.
+  MOZ_DIAGNOSTIC_ASSERT(!mURLList.IsEmpty());
+  if (channelURLSpec != mURLList[0]) {
+    mURLList.AppendElement(channelURLSpec);
+  }
+
+  UniquePtr<char16_t[], JS::FreePolicy> buffer;
+  size_t len = 0;
+
+  rv = ScriptLoader::ConvertToUTF16(httpChannel, aString, aLen, u"UTF-8"_ns,
+                                    nullptr, buffer, len);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mBuffer.Adopt(buffer.release(), len);
+
+  rv = NS_OK;
+  return NS_OK;
+}
+
+nsresult CompareCache::Initialize(Cache* const aCache, const nsAString& aURL) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aCache);
+  MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization);
+
+  // This JSContext will not end up executing JS code because here there are
+  // no ReadableStreams involved.
+  AutoJSAPI jsapi;
+  jsapi.Init();
+
+  RequestOrUSVString request;
+  request.SetAsUSVString().ShareOrDependUpon(aURL);
+  ErrorResult error;
+  CacheQueryOptions params;
+  RefPtr<Promise> promise = aCache->Match(jsapi.cx(), request, params, error);
+  if (NS_WARN_IF(error.Failed())) {
+    // No exception here because there are no ReadableStreams involved here.
+    MOZ_ASSERT(!error.IsJSException());
+    mState = Finished;
+    return error.StealNSResult();
+  }
+
+  // Retrieve the script from aCache.
+  mState = WaitingForScript;
+  promise->AppendNativeHandler(this);
+  return NS_OK;
+}
+
+void CompareCache::Finish(nsresult aStatus, bool aInCache) {
+  if (mState != Finished) {
+    mState = Finished;
+    mInCache = aInCache;
+    mCN->CacheFinish(aStatus);
+  }
+}
+
+void CompareCache::Abort() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState != Finished) {
+    mState = Finished;
+
+    if (mPump) {
+      mPump->CancelWithReason(NS_BINDING_ABORTED, "CompareCache::Abort"_ns);
+      mPump = nullptr;
+    }
+  }
+}
+
+NS_IMETHODIMP
+CompareCache::OnStreamComplete(nsIStreamLoader* aLoader, nsISupports* aContext,
+                               nsresult aStatus, uint32_t aLen,
+                               const uint8_t* aString) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState == Finished) {
+    return aStatus;
+  }
+
+  if (NS_WARN_IF(NS_FAILED(aStatus))) {
+    Finish(aStatus, false);
+    return aStatus;
+  }
+
+  UniquePtr<char16_t[], JS::FreePolicy> buffer;
+  size_t len = 0;
+
+  nsresult rv = ScriptLoader::ConvertToUTF16(nullptr, aString, aLen,
+                                             u"UTF-8"_ns, nullptr, buffer, len);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Finish(rv, false);
+    return rv;
+  }
+
+  mBuffer.Adopt(buffer.release(), len);
+
+  Finish(NS_OK, true);
+  return NS_OK;
+}
+
+void CompareCache::ResolvedCallback(JSContext* aCx,
+                                    JS::Handle<JS::Value> aValue,
+                                    ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  switch (mState) {
+    case Finished:
+      return;
+    case WaitingForScript:
+      ManageValueResult(aCx, aValue);
+      return;
+    default:
+      MOZ_CRASH("Unacceptable state.");
+  }
+}
+
+void CompareCache::RejectedCallback(JSContext* aCx,
+                                    JS::Handle<JS::Value> aValue,
+                                    ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState != Finished) {
+    Finish(NS_ERROR_FAILURE, false);
+    return;
+  }
+}
+
+void CompareCache::ManageValueResult(JSContext* aCx,
+                                     JS::Handle<JS::Value> aValue) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // The cache returns undefined if the object is not stored.
+  if (aValue.isUndefined()) {
+    Finish(NS_OK, false);
+    return;
+  }
+
+  MOZ_ASSERT(aValue.isObject());
+
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+  if (NS_WARN_IF(!obj)) {
+    Finish(NS_ERROR_FAILURE, false);
+    return;
+  }
+
+  Response* response = nullptr;
+  nsresult rv = UNWRAP_OBJECT(Response, &obj, response);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Finish(rv, false);
+    return;
+  }
+
+  MOZ_ASSERT(response->Ok());
+
+  nsCOMPtr<nsIInputStream> inputStream;
+  response->GetBody(getter_AddRefs(inputStream));
+  MOZ_ASSERT(inputStream);
+
+  MOZ_ASSERT(!mPump);
+  rv = NS_NewInputStreamPump(getter_AddRefs(mPump), inputStream.forget(),
+                             0,     /* default segsize */
+                             0,     /* default segcount */
+                             false, /* default closeWhenDone */
+                             GetMainThreadSerialEventTarget());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Finish(rv, false);
+    return;
+  }
+
+  nsCOMPtr<nsIStreamLoader> loader;
+  rv = NS_NewStreamLoader(getter_AddRefs(loader), this);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Finish(rv, false);
+    return;
+  }
+
+  rv = mPump->AsyncRead(loader);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    mPump = nullptr;
+    Finish(rv, false);
+    return;
+  }
+
+  nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(mPump);
+  if (rr) {
+    nsCOMPtr<nsIEventTarget> sts =
+        do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+    RefPtr<TaskQueue> queue =
+        TaskQueue::Create(sts.forget(), "CompareCache STS Delivery Queue");
+    rv = rr->RetargetDeliveryTo(queue);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      mPump = nullptr;
+      Finish(rv, false);
+      return;
+    }
+  }
+}
+
+nsresult CompareManager::Initialize(nsIPrincipal* aPrincipal,
+                                    const nsAString& aURL,
+                                    const nsAString& aCacheName) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(mPendingCount == 0);
+  MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization);
+
+  // RAII Cleanup when fails.
+  auto guard = MakeScopeExit([&] { Cleanup(); });
+
+  mURL = aURL;
+  mPrincipal = aPrincipal;
+
+  // Always create a CacheStorage since we want to write the network entry to
+  // the cache even if there isn't an existing one.
+  AutoJSAPI jsapi;
+  jsapi.Init();
+  ErrorResult result;
+  mCacheStorage = CreateCacheStorage(jsapi.cx(), aPrincipal, result);
+  if (NS_WARN_IF(result.Failed())) {
+    MOZ_ASSERT(!result.IsErrorWithMessage());
+    return result.StealNSResult();
+  }
+
+  // If there is no existing cache, proceed to fetch the script directly.
+  if (aCacheName.IsEmpty()) {
+    mState = WaitingForScriptOrComparisonResult;
+    nsresult rv = FetchScript(aURL, true /* aIsMainScript */);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    guard.release();
+    return NS_OK;
+  }
+
+  // Open the cache saving the old source scripts.
+  RefPtr<Promise> promise = mCacheStorage->Open(aCacheName, result);
+  if (NS_WARN_IF(result.Failed())) {
+    MOZ_ASSERT(!result.IsErrorWithMessage());
+    return result.StealNSResult();
+  }
+
+  mState = WaitingForExistingOpen;
+  promise->AppendNativeHandler(this);
+
+  guard.release();
+  return NS_OK;
+}
+
+// This class manages 4 promises if needed:
+// 1. Retrieve the Cache object by a given CacheName of OldCache.
+// 2. Retrieve the URLs saved in OldCache.
+// 3. Retrieve the Cache object of the NewCache for the newly created SW.
+// 4. Put the value in the cache.
+// For this reason we have mState to know what callback we are handling.
+void CompareManager::ResolvedCallback(JSContext* aCx,
+                                      JS::Handle<JS::Value> aValue,
+                                      ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mCallback);
+
+  switch (mState) {
+    case Finished:
+      return;
+    case WaitingForExistingOpen:
+      ManageOldCache(aCx, aValue);
+      return;
+    case WaitingForExistingKeys:
+      ManageOldKeys(aCx, aValue);
+      return;
+    case WaitingForOpen:
+      ManageNewCache(aCx, aValue);
+      return;
+    case WaitingForPut:
+      MOZ_DIAGNOSTIC_ASSERT(mPendingCount > 0);
+      if (--mPendingCount == 0) {
+        mCallback->ComparisonResult(NS_OK, false /* aIsEqual */, mOnFailure,
+                                    mNewCacheName, mMaxScope, mLoadFlags);
+        Cleanup();
+      }
+      return;
+    default:
+      MOZ_DIAGNOSTIC_ASSERT(false);
+  }
+}
+
+void CompareManager::RejectedCallback(JSContext* aCx,
+                                      JS::Handle<JS::Value> aValue,
+                                      ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  switch (mState) {
+    case Finished:
+      return;
+    case WaitingForExistingOpen:
+      NS_WARNING("Could not open the existing cache.");
+      break;
+    case WaitingForExistingKeys:
+      NS_WARNING("Could not get the existing URLs.");
+      break;
+    case WaitingForOpen:
+      NS_WARNING("Could not open cache.");
+      break;
+    case WaitingForPut:
+      NS_WARNING("Could not write to cache.");
+      break;
+    default:
+      MOZ_DIAGNOSTIC_ASSERT(false);
+  }
+
+  Fail(NS_ERROR_FAILURE);
+}
+
+void CompareManager::Fail(nsresult aStatus) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mCallback->ComparisonResult(aStatus, false /* aIsEqual */, mOnFailure, u""_ns,
+                              ""_ns, mLoadFlags);
+  Cleanup();
+}
+
+void CompareManager::Cleanup() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mState != Finished) {
+    mState = Finished;
+
+    MOZ_ASSERT(mCallback);
+    mCallback = nullptr;
+
+    // Abort and release CompareNetworks.
+    for (uint32_t i = 0; i < mCNList.Length(); ++i) {
+      mCNList[i]->Abort();
+    }
+    mCNList.Clear();
+  }
+}
+
+}  // namespace
+
+nsresult PurgeCache(nsIPrincipal* aPrincipal, const nsAString& aCacheName) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+
+  if (aCacheName.IsEmpty()) {
+    return NS_OK;
+  }
+
+  AutoJSAPI jsapi;
+  jsapi.Init();
+  ErrorResult rv;
+  RefPtr<CacheStorage> cacheStorage =
+      CreateCacheStorage(jsapi.cx(), aPrincipal, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    return rv.StealNSResult();
+  }
+
+  // We use the ServiceWorker scope as key for the cacheStorage.
+  RefPtr<Promise> promise = cacheStorage->Delete(aCacheName, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    return rv.StealNSResult();
+  }
+
+  // Set [[PromiseIsHandled]] to ensure that if this promise gets rejected,
+  // we don't end up reporting a rejected promise to the console.
+  MOZ_ALWAYS_TRUE(promise->SetAnyPromiseIsHandled());
+
+  // We don't actually care about the result of the delete operation.
+  return NS_OK;
+}
+
+nsresult GenerateCacheName(nsAString& aName) {
+  nsresult rv;
+  nsCOMPtr<nsIUUIDGenerator> uuidGenerator =
+      do_GetService("@mozilla.org/uuid-generator;1", &rv);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsID id;
+  rv = uuidGenerator->GenerateUUIDInPlace(&id);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  char chars[NSID_LENGTH];
+  id.ToProvidedString(chars);
+
+  // NSID_LENGTH counts the null terminator.
+  aName.AssignASCII(chars, NSID_LENGTH - 1);
+
+  return NS_OK;
+}
+
+nsresult Compare(ServiceWorkerRegistrationInfo* aRegistration,
+                 nsIPrincipal* aPrincipal, const nsAString& aCacheName,
+                 const nsAString& aURL, CompareCallback* aCallback) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRegistration);
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(!aURL.IsEmpty());
+  MOZ_ASSERT(aCallback);
+
+  RefPtr<CompareManager> cm = new CompareManager(aRegistration, aCallback);
+
+  nsresult rv = cm->Initialize(aPrincipal, aURL, aCacheName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom::serviceWorkerScriptCache
diff --git a/dom/serviceworkers/ServiceWorkerScriptCache.h b/dom/serviceworkers/ServiceWorkerScriptCache.h
new file mode 100644
index 0000000000..5d71840b46
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerScriptCache.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerScriptCache_h
+#define mozilla_dom_ServiceWorkerScriptCache_h
+
+#include "nsIRequest.h"
+#include "nsISupportsImpl.h"
+#include "nsString.h"
+
+class nsILoadGroup;
+class nsIPrincipal;
+
+namespace mozilla::dom {
+
+class ServiceWorkerRegistrationInfo;
+
+namespace serviceWorkerScriptCache {
+
+nsresult PurgeCache(nsIPrincipal* aPrincipal, const nsAString& aCacheName);
+
+nsresult GenerateCacheName(nsAString& aName);
+
+enum class OnFailure : uint8_t { DoNothing, Uninstall };
+
+class CompareCallback {
+ public:
+  /*
+   * If there is an error, ignore aInCacheAndEqual and aNewCacheName.
+   * On success, if the cached result and network result matched,
+   * aInCacheAndEqual will be true and no new cache name is passed, otherwise
+   * use the new cache name to load the ServiceWorker.
+   */
+  virtual void ComparisonResult(nsresult aStatus, bool aInCacheAndEqual,
+                                OnFailure aOnFailure,
+                                const nsAString& aNewCacheName,
+                                const nsACString& aMaxScope,
+                                nsLoadFlags aLoadFlags) = 0;
+
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+};
+
+nsresult Compare(ServiceWorkerRegistrationInfo* aRegistration,
+                 nsIPrincipal* aPrincipal, const nsAString& aCacheName,
+                 const nsAString& aURL, CompareCallback* aCallback);
+
+}  // namespace serviceWorkerScriptCache
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ServiceWorkerScriptCache_h
diff --git a/dom/serviceworkers/ServiceWorkerShutdownBlocker.cpp b/dom/serviceworkers/ServiceWorkerShutdownBlocker.cpp
new file mode 100644
index 0000000000..05a2eb5c31
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerShutdownBlocker.cpp
@@ -0,0 +1,291 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerShutdownBlocker.h"
+
+#include <chrono>
+#include <utility>
+
+#include "MainThreadUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsIWritablePropertyBag2.h"
+#include "nsThreadUtils.h"
+#include "ServiceWorkerManager.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_ISUPPORTS(ServiceWorkerShutdownBlocker, nsIAsyncShutdownBlocker,
+                  nsITimerCallback, nsINamed)
+
+NS_IMETHODIMP ServiceWorkerShutdownBlocker::GetName(nsAString& aNameOut) {
+  aNameOut = nsLiteralString(
+      u"ServiceWorkerShutdownBlocker: shutting down Service Workers");
+  return NS_OK;
+}
+
+// nsINamed implementation
+NS_IMETHODIMP ServiceWorkerShutdownBlocker::GetName(nsACString& aNameOut) {
+  aNameOut.AssignLiteral("ServiceWorkerShutdownBlocker");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerShutdownBlocker::BlockShutdown(nsIAsyncShutdownClient* aClient) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(!mShutdownClient);
+  MOZ_ASSERT(mServiceWorkerManager);
+
+  mShutdownClient = aClient;
+
+  (*mServiceWorkerManager)->MaybeStartShutdown();
+  mServiceWorkerManager.destroy();
+
+  MaybeUnblockShutdown();
+  MaybeInitUnblockShutdownTimer();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP ServiceWorkerShutdownBlocker::GetState(nsIPropertyBag** aBagOut) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aBagOut);
+
+  nsCOMPtr<nsIWritablePropertyBag2> propertyBag =
+      do_CreateInstance("@mozilla.org/hash-property-bag;1");
+
+  if (NS_WARN_IF(!propertyBag)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  nsresult rv = propertyBag->SetPropertyAsBool(u"acceptingPromises"_ns,
+                                               IsAcceptingPromises());
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = propertyBag->SetPropertyAsUint32(u"pendingPromises"_ns,
+                                        GetPendingPromises());
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString shutdownStates;
+
+  for (auto iter = mShutdownStates.iter(); !iter.done(); iter.next()) {
+    shutdownStates.Append(iter.get().value().GetProgressString());
+    shutdownStates.Append(", ");
+  }
+
+  rv = propertyBag->SetPropertyAsACString(u"shutdownStates"_ns, shutdownStates);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  propertyBag.forget(aBagOut);
+
+  return NS_OK;
+}
+
+/* static */ already_AddRefed<ServiceWorkerShutdownBlocker>
+ServiceWorkerShutdownBlocker::CreateAndRegisterOn(
+    nsIAsyncShutdownClient& aShutdownBarrier,
+    ServiceWorkerManager& aServiceWorkerManager) {
+  AssertIsOnMainThread();
+
+  RefPtr<ServiceWorkerShutdownBlocker> blocker =
+      new ServiceWorkerShutdownBlocker(aServiceWorkerManager);
+
+  nsresult rv = aShutdownBarrier.AddBlocker(
+      blocker.get(), NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__,
+      u"Service Workers shutdown"_ns);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  return blocker.forget();
+}
+
+void ServiceWorkerShutdownBlocker::WaitOnPromise(
+    GenericNonExclusivePromise* aPromise, uint32_t aShutdownStateId) {
+  AssertIsOnMainThread();
+  MOZ_DIAGNOSTIC_ASSERT(IsAcceptingPromises());
+  MOZ_ASSERT(aPromise);
+  MOZ_ASSERT(mShutdownStates.has(aShutdownStateId));
+
+  ++mState.as<AcceptingPromises>().mPendingPromises;
+
+  RefPtr<ServiceWorkerShutdownBlocker> self = this;
+
+  aPromise->Then(GetCurrentSerialEventTarget(), __func__,
+                 [self = std::move(self), shutdownStateId = aShutdownStateId](
+                     const GenericNonExclusivePromise::ResolveOrRejectValue&) {
+                   // Progress reporting might race with aPromise settling.
+                   self->mShutdownStates.remove(shutdownStateId);
+
+                   if (!self->PromiseSettled()) {
+                     self->MaybeUnblockShutdown();
+                   }
+                 });
+}
+
+void ServiceWorkerShutdownBlocker::StopAcceptingPromises() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(IsAcceptingPromises());
+
+  mState = AsVariant(NotAcceptingPromises(mState.as<AcceptingPromises>()));
+
+  MaybeUnblockShutdown();
+  MaybeInitUnblockShutdownTimer();
+}
+
+uint32_t ServiceWorkerShutdownBlocker::CreateShutdownState() {
+  AssertIsOnMainThread();
+
+  static uint32_t nextShutdownStateId = 1;
+
+  MOZ_ALWAYS_TRUE(mShutdownStates.putNew(nextShutdownStateId,
+                                         ServiceWorkerShutdownState()));
+
+  return nextShutdownStateId++;
+}
+
+void ServiceWorkerShutdownBlocker::ReportShutdownProgress(
+    uint32_t aShutdownStateId, Progress aProgress) {
+  AssertIsOnMainThread();
+  MOZ_RELEASE_ASSERT(aShutdownStateId != kInvalidShutdownStateId);
+
+  auto lookup = mShutdownStates.lookup(aShutdownStateId);
+
+  // Progress reporting might race with the promise that WaitOnPromise is called
+  // with settling.
+  if (!lookup) {
+    return;
+  }
+
+  // This will check for a valid progress transition with assertions.
+  lookup->value().SetProgress(aProgress);
+
+  if (aProgress == Progress::ShutdownCompleted) {
+    mShutdownStates.remove(lookup);
+  }
+}
+
+ServiceWorkerShutdownBlocker::ServiceWorkerShutdownBlocker(
+    ServiceWorkerManager& aServiceWorkerManager)
+    : mState(VariantType<AcceptingPromises>()),
+      mServiceWorkerManager(WrapNotNull(&aServiceWorkerManager)) {
+  AssertIsOnMainThread();
+}
+
+ServiceWorkerShutdownBlocker::~ServiceWorkerShutdownBlocker() {
+  MOZ_ASSERT(!IsAcceptingPromises());
+  MOZ_ASSERT(!GetPendingPromises());
+  MOZ_ASSERT(!mShutdownClient);
+  MOZ_ASSERT(!mServiceWorkerManager);
+}
+
+void ServiceWorkerShutdownBlocker::MaybeUnblockShutdown() {
+  AssertIsOnMainThread();
+
+  if (!mShutdownClient || IsAcceptingPromises() || GetPendingPromises()) {
+    return;
+  }
+
+  UnblockShutdown();
+}
+
+void ServiceWorkerShutdownBlocker::UnblockShutdown() {
+  MOZ_ASSERT(mShutdownClient);
+
+  mShutdownClient->RemoveBlocker(this);
+  mShutdownClient = nullptr;
+
+  if (mTimer) {
+    mTimer->Cancel();
+  }
+}
+
+uint32_t ServiceWorkerShutdownBlocker::PromiseSettled() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(GetPendingPromises());
+
+  if (IsAcceptingPromises()) {
+    return --mState.as<AcceptingPromises>().mPendingPromises;
+  }
+
+  return --mState.as<NotAcceptingPromises>().mPendingPromises;
+}
+
+bool ServiceWorkerShutdownBlocker::IsAcceptingPromises() const {
+  AssertIsOnMainThread();
+
+  return mState.is<AcceptingPromises>();
+}
+
+uint32_t ServiceWorkerShutdownBlocker::GetPendingPromises() const {
+  AssertIsOnMainThread();
+
+  if (IsAcceptingPromises()) {
+    return mState.as<AcceptingPromises>().mPendingPromises;
+  }
+
+  return mState.as<NotAcceptingPromises>().mPendingPromises;
+}
+
+ServiceWorkerShutdownBlocker::NotAcceptingPromises::NotAcceptingPromises(
+    AcceptingPromises aPreviousState)
+    : mPendingPromises(aPreviousState.mPendingPromises) {
+  AssertIsOnMainThread();
+}
+
+NS_IMETHODIMP ServiceWorkerShutdownBlocker::Notify(nsITimer*) {
+  // TODO: this method being called indicates that there are ServiceWorkers
+  // that did not complete shutdown before the timer expired - there should be
+  // a telemetry ping or some other way of recording the state of when this
+  // happens (e.g. what's returned by GetState()).
+  UnblockShutdown();
+  return NS_OK;
+}
+
+#ifdef RELEASE_OR_BETA
+#  define SW_UNBLOCK_SHUTDOWN_TIMER_DURATION 10s
+#else
+// In Nightly, we do want a shutdown hang to be reported so we pick a value
+// notably longer than the 60s of the RunWatchDog timeout.
+#  define SW_UNBLOCK_SHUTDOWN_TIMER_DURATION 200s
+#endif
+
+void ServiceWorkerShutdownBlocker::MaybeInitUnblockShutdownTimer() {
+  AssertIsOnMainThread();
+
+  if (mTimer || !mShutdownClient || IsAcceptingPromises()) {
+    return;
+  }
+
+  MOZ_ASSERT(GetPendingPromises(),
+             "Shouldn't be blocking shutdown with zero pending promises.");
+
+  using namespace std::chrono_literals;
+
+  static constexpr auto delay =
+      std::chrono::duration_cast<std::chrono::milliseconds>(
+          SW_UNBLOCK_SHUTDOWN_TIMER_DURATION);
+
+  mTimer = NS_NewTimer();
+
+  mTimer->InitWithCallback(this, delay.count(), nsITimer::TYPE_ONE_SHOT);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerShutdownBlocker.h b/dom/serviceworkers/ServiceWorkerShutdownBlocker.h
new file mode 100644
index 0000000000..a200325c5b
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerShutdownBlocker.h
@@ -0,0 +1,157 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkershutdownblocker_h__
+#define mozilla_dom_serviceworkershutdownblocker_h__
+
+#include "nsCOMPtr.h"
+#include "nsIAsyncShutdown.h"
+#include "nsISupportsImpl.h"
+#include "nsITimer.h"
+
+#include "ServiceWorkerShutdownState.h"
+#include "mozilla/InitializedOnce.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/HashTable.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerManager;
+
+/**
+ * Main thread only.
+ *
+ * A ServiceWorkerShutdownBlocker will "accept promises", and each of these
+ * promises will be a "pending promise" while it hasn't settled. At some point,
+ * `StopAcceptingPromises()` should be called and the state will change to "not
+ * accepting promises" (this is a one way state transition). The shutdown phase
+ * of the shutdown client the blocker is created with will be blocked until
+ * there are no more pending promises.
+ *
+ * It doesn't matter whether the state changes to "not accepting promises"
+ * before or during the associated shutdown phase.
+ *
+ * In beta/release builds there will be an additional timer that starts ticking
+ * once both the shutdown phase has been reached and the state is "not accepting
+ * promises". If when the timer expire there are still pending promises,
+ * shutdown will be forcefully unblocked.
+ */
+class ServiceWorkerShutdownBlocker final : public nsIAsyncShutdownBlocker,
+                                           public nsITimerCallback,
+                                           public nsINamed {
+ public:
+  using Progress = ServiceWorkerShutdownState::Progress;
+  static const uint32_t kInvalidShutdownStateId = 0;
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIASYNCSHUTDOWNBLOCKER
+  NS_DECL_NSITIMERCALLBACK
+  NS_DECL_NSINAMED
+
+  /**
+   * Returns the registered shutdown blocker if registration succeeded and
+   * nullptr otherwise.
+   */
+  static already_AddRefed<ServiceWorkerShutdownBlocker> CreateAndRegisterOn(
+      nsIAsyncShutdownClient& aShutdownBarrier,
+      ServiceWorkerManager& aServiceWorkerManager);
+
+  /**
+   * Blocks shutdown until `aPromise` settles.
+   *
+   * Can be called multiple times, and shutdown will be blocked until all the
+   * calls' promises settle, but all of these calls must happen before
+   * `StopAcceptingPromises()` is called (assertions will enforce this).
+   *
+   * See `CreateShutdownState` for aShutdownStateId, which is needed to clear
+   * the shutdown state if the shutdown process aborts for some reason.
+   */
+  void WaitOnPromise(GenericNonExclusivePromise* aPromise,
+                     uint32_t aShutdownStateId);
+
+  /**
+   * Once this is called, shutdown will be blocked until all promises
+   * passed to `WaitOnPromise()` settle, and there must be no more calls to
+   * `WaitOnPromise()` (assertions will enforce this).
+   */
+  void StopAcceptingPromises();
+
+  /**
+   * Start tracking the shutdown of an individual ServiceWorker for hang
+   * reporting purposes. Returns a "shutdown state ID" that should be used
+   * in subsequent calls to ReportShutdownProgress. The shutdown of an
+   * individual ServiceWorker is presumed to be completed when its `Progress`
+   * reaches `Progress::ShutdownCompleted`.
+   */
+  uint32_t CreateShutdownState();
+
+  void ReportShutdownProgress(uint32_t aShutdownStateId, Progress aProgress);
+
+ private:
+  explicit ServiceWorkerShutdownBlocker(
+      ServiceWorkerManager& aServiceWorkerManager);
+
+  ~ServiceWorkerShutdownBlocker();
+
+  /**
+   * No-op if any of the following are true:
+   * 1) `BlockShutdown()` hasn't been called yet, or
+   * 2) `StopAcceptingPromises()` hasn't been called yet, or
+   * 3) `StopAcceptingPromises()` HAS been called, but there are still pending
+   *    promises.
+   */
+  void MaybeUnblockShutdown();
+
+  /**
+   * Requires `BlockShutdown()` to have been called.
+   */
+  void UnblockShutdown();
+
+  /**
+   * Returns the remaining pending promise count (i.e. excluding the promise
+   * that just settled).
+   */
+  uint32_t PromiseSettled();
+
+  bool IsAcceptingPromises() const;
+
+  uint32_t GetPendingPromises() const;
+
+  /**
+   * Initializes a timer that will unblock shutdown unconditionally once it's
+   * expired (even if there are still pending promises). No-op if:
+   * 1) not a beta or release build, or
+   * 2) shutdown is not being blocked or `StopAcceptingPromises()` has not been
+   *    called.
+   */
+  void MaybeInitUnblockShutdownTimer();
+
+  struct AcceptingPromises {
+    uint32_t mPendingPromises = 0;
+  };
+
+  struct NotAcceptingPromises {
+    explicit NotAcceptingPromises(AcceptingPromises aPreviousState);
+
+    uint32_t mPendingPromises = 0;
+  };
+
+  Variant<AcceptingPromises, NotAcceptingPromises> mState;
+
+  nsCOMPtr<nsIAsyncShutdownClient> mShutdownClient;
+
+  HashMap<uint32_t, ServiceWorkerShutdownState> mShutdownStates;
+
+  nsCOMPtr<nsITimer> mTimer;
+  LazyInitializedOnceEarlyDestructible<
+      const NotNull<RefPtr<ServiceWorkerManager>>>
+      mServiceWorkerManager;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkershutdownblocker_h__
diff --git a/dom/serviceworkers/ServiceWorkerShutdownState.cpp b/dom/serviceworkers/ServiceWorkerShutdownState.cpp
new file mode 100644
index 0000000000..686f314877
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerShutdownState.cpp
@@ -0,0 +1,164 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerShutdownState.h"
+
+#include <array>
+#include <type_traits>
+
+#include "MainThreadUtils.h"
+#include "ServiceWorkerUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/RemoteWorkerService.h"
+#include "mozilla/dom/ServiceWorkerManager.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "nsDebug.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+
+namespace mozilla::dom {
+
+using Progress = ServiceWorkerShutdownState::Progress;
+
+namespace {
+
+constexpr inline auto UnderlyingProgressValue(Progress aProgress) {
+  return std::underlying_type_t<Progress>(aProgress);
+}
+
+constexpr std::array<const char*, UnderlyingProgressValue(Progress::EndGuard_)>
+    gProgressStrings = {{
+        // clang-format off
+      "parent process main thread",
+      "parent process IPDL background thread",
+      "content process worker launcher thread",
+      "content process main thread",
+      "shutdown completed"
+        // clang-format on
+    }};
+
+}  // anonymous namespace
+
+ServiceWorkerShutdownState::ServiceWorkerShutdownState()
+    : mProgress(Progress::ParentProcessMainThread) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+ServiceWorkerShutdownState::~ServiceWorkerShutdownState() {
+  Unused << NS_WARN_IF(mProgress != Progress::ShutdownCompleted);
+}
+
+const char* ServiceWorkerShutdownState::GetProgressString() const {
+  return gProgressStrings[UnderlyingProgressValue(mProgress)];
+}
+
+void ServiceWorkerShutdownState::SetProgress(Progress aProgress) {
+  MOZ_ASSERT(aProgress != Progress::EndGuard_);
+  MOZ_RELEASE_ASSERT(UnderlyingProgressValue(mProgress) + 1 ==
+                     UnderlyingProgressValue(aProgress));
+
+  mProgress = aProgress;
+}
+
+namespace {
+
+void ReportProgressToServiceWorkerManager(uint32_t aShutdownStateId,
+                                          Progress aProgress) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  MOZ_RELEASE_ASSERT(swm, "ServiceWorkers should shutdown before SWM.");
+
+  swm->ReportServiceWorkerShutdownProgress(aShutdownStateId, aProgress);
+}
+
+void ReportProgressToParentProcess(uint32_t aShutdownStateId,
+                                   Progress aProgress) {
+  MOZ_ASSERT(XRE_IsContentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  ContentChild* contentChild = ContentChild::GetSingleton();
+  MOZ_ASSERT(contentChild);
+
+  contentChild->SendReportServiceWorkerShutdownProgress(aShutdownStateId,
+                                                        aProgress);
+}
+
+void ReportServiceWorkerShutdownProgress(uint32_t aShutdownStateId,
+                                         Progress aProgress) {
+  MOZ_ASSERT(UnderlyingProgressValue(Progress::ParentProcessMainThread) <
+             UnderlyingProgressValue(aProgress));
+  MOZ_ASSERT(UnderlyingProgressValue(aProgress) <
+             UnderlyingProgressValue(Progress::EndGuard_));
+
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__, [shutdownStateId = aShutdownStateId, progress = aProgress] {
+        if (XRE_IsParentProcess()) {
+          ReportProgressToServiceWorkerManager(shutdownStateId, progress);
+        } else {
+          ReportProgressToParentProcess(shutdownStateId, progress);
+        }
+      });
+
+  if (NS_IsMainThread()) {
+    MOZ_ALWAYS_SUCCEEDS(r->Run());
+  } else {
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r.forget()));
+  }
+}
+
+void ReportServiceWorkerShutdownProgress(uint32_t aShutdownStateId) {
+  Progress progress = Progress::EndGuard_;
+
+  if (XRE_IsParentProcess()) {
+    mozilla::ipc::AssertIsOnBackgroundThread();
+
+    progress = Progress::ParentProcessIpdlBackgroundThread;
+  } else {
+    if (NS_IsMainThread()) {
+      progress = Progress::ContentProcessMainThread;
+    } else {
+      MOZ_ASSERT(RemoteWorkerService::Thread()->IsOnCurrentThread());
+      progress = Progress::ContentProcessWorkerLauncherThread;
+    }
+  }
+
+  ReportServiceWorkerShutdownProgress(aShutdownStateId, progress);
+}
+
+}  // anonymous namespace
+
+void MaybeReportServiceWorkerShutdownProgress(const ServiceWorkerOpArgs& aArgs,
+                                              bool aShutdownCompleted) {
+  if (XRE_IsParentProcess() && !XRE_IsE10sParentProcess()) {
+    return;
+  }
+
+  if (aShutdownCompleted) {
+    MOZ_ASSERT(aArgs.type() ==
+               ServiceWorkerOpArgs::TServiceWorkerTerminateWorkerOpArgs);
+
+    ReportServiceWorkerShutdownProgress(
+        aArgs.get_ServiceWorkerTerminateWorkerOpArgs().shutdownStateId(),
+        Progress::ShutdownCompleted);
+
+    return;
+  }
+
+  if (aArgs.type() ==
+      ServiceWorkerOpArgs::TServiceWorkerTerminateWorkerOpArgs) {
+    ReportServiceWorkerShutdownProgress(
+        aArgs.get_ServiceWorkerTerminateWorkerOpArgs().shutdownStateId());
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerShutdownState.h b/dom/serviceworkers/ServiceWorkerShutdownState.h
new file mode 100644
index 0000000000..eec55fab8d
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerShutdownState.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_SERVICEWORKERS_SERVICEWORKERSHUTDOWNSTATE_H_
+#define DOM_SERVICEWORKERS_SERVICEWORKERSHUTDOWNSTATE_H_
+
+#include <cstdint>
+
+#include "ipc/EnumSerializer.h"
+#include "mozilla/dom/ServiceWorkerOpArgs.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerShutdownState {
+ public:
+  // Represents the "location" of the shutdown message or completion of
+  // shutdown.
+  enum class Progress {
+    ParentProcessMainThread,
+    ParentProcessIpdlBackgroundThread,
+    ContentProcessWorkerLauncherThread,
+    ContentProcessMainThread,
+    ShutdownCompleted,
+    EndGuard_,
+  };
+
+  ServiceWorkerShutdownState();
+
+  ~ServiceWorkerShutdownState();
+
+  const char* GetProgressString() const;
+
+  void SetProgress(Progress aProgress);
+
+ private:
+  Progress mProgress;
+};
+
+// Asynchronously reports that shutdown has progressed to the calling thread
+// if aArgs is for shutdown. If aShutdownCompleted is true, aArgs must be for
+// shutdown.
+void MaybeReportServiceWorkerShutdownProgress(const ServiceWorkerOpArgs& aArgs,
+                                              bool aShutdownCompleted = false);
+
+}  // namespace mozilla::dom
+
+namespace IPC {
+
+using Progress = mozilla::dom::ServiceWorkerShutdownState::Progress;
+
+template <>
+struct ParamTraits<Progress>
+    : public ContiguousEnumSerializer<
+          Progress, Progress::ParentProcessMainThread, Progress::EndGuard_> {};
+
+}  // namespace IPC
+
+#endif  // DOM_SERVICEWORKERS_SERVICEWORKERSHUTDOWNSTATE_H_
diff --git a/dom/serviceworkers/ServiceWorkerUnregisterCallback.cpp b/dom/serviceworkers/ServiceWorkerUnregisterCallback.cpp
new file mode 100644
index 0000000000..36650c9b55
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUnregisterCallback.cpp
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerUnregisterCallback.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_ISUPPORTS(UnregisterCallback, nsIServiceWorkerUnregisterCallback)
+
+UnregisterCallback::UnregisterCallback()
+    : mPromise(new GenericPromise::Private(__func__)) {}
+
+UnregisterCallback::UnregisterCallback(GenericPromise::Private* aPromise)
+    : mPromise(aPromise) {
+  MOZ_DIAGNOSTIC_ASSERT(mPromise);
+}
+
+NS_IMETHODIMP
+UnregisterCallback::UnregisterSucceeded(bool aState) {
+  mPromise->Resolve(aState, __func__);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UnregisterCallback::UnregisterFailed() {
+  mPromise->Reject(NS_ERROR_DOM_SECURITY_ERR, __func__);
+  return NS_OK;
+}
+
+RefPtr<GenericPromise> UnregisterCallback::Promise() const { return mPromise; }
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerUnregisterCallback.h b/dom/serviceworkers/ServiceWorkerUnregisterCallback.h
new file mode 100644
index 0000000000..dd1a53b37d
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUnregisterCallback.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerUnregisterCallback_h
+#define mozilla_dom_ServiceWorkerUnregisterCallback_h
+
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "nsIServiceWorkerManager.h"
+
+namespace mozilla::dom {
+
+class UnregisterCallback final : public nsIServiceWorkerUnregisterCallback {
+ public:
+  NS_DECL_ISUPPORTS
+
+  UnregisterCallback();
+
+  explicit UnregisterCallback(GenericPromise::Private* aPromise);
+
+  // nsIServiceWorkerUnregisterCallback implementation
+  NS_IMETHOD
+  UnregisterSucceeded(bool aState) override;
+
+  NS_IMETHOD
+  UnregisterFailed() override;
+
+  RefPtr<GenericPromise> Promise() const;
+
+ private:
+  ~UnregisterCallback() = default;
+
+  RefPtr<GenericPromise::Private> mPromise;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ServiceWorkerUnregisterCallback_h
diff --git a/dom/serviceworkers/ServiceWorkerUnregisterJob.cpp b/dom/serviceworkers/ServiceWorkerUnregisterJob.cpp
new file mode 100644
index 0000000000..5cf61e2a93
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUnregisterJob.cpp
@@ -0,0 +1,135 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerUnregisterJob.h"
+
+#include "mozilla/Unused.h"
+#include "nsIPushService.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "ServiceWorkerManager.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerUnregisterJob::PushUnsubscribeCallback final
+    : public nsIUnsubscribeResultCallback {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit PushUnsubscribeCallback(ServiceWorkerUnregisterJob* aJob)
+      : mJob(aJob) {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  NS_IMETHOD
+  OnUnsubscribe(nsresult aStatus, bool) override {
+    // Warn if unsubscribing fails, but don't prevent the worker from
+    // unregistering.
+    Unused << NS_WARN_IF(NS_FAILED(aStatus));
+    mJob->Unregister();
+    return NS_OK;
+  }
+
+ private:
+  ~PushUnsubscribeCallback() = default;
+
+  RefPtr<ServiceWorkerUnregisterJob> mJob;
+};
+
+NS_IMPL_ISUPPORTS(ServiceWorkerUnregisterJob::PushUnsubscribeCallback,
+                  nsIUnsubscribeResultCallback)
+
+ServiceWorkerUnregisterJob::ServiceWorkerUnregisterJob(nsIPrincipal* aPrincipal,
+                                                       const nsACString& aScope)
+    : ServiceWorkerJob(Type::Unregister, aPrincipal, aScope, ""_ns),
+      mResult(false) {}
+
+bool ServiceWorkerUnregisterJob::GetResult() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  return mResult;
+}
+
+ServiceWorkerUnregisterJob::~ServiceWorkerUnregisterJob() = default;
+
+void ServiceWorkerUnregisterJob::AsyncExecute() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (Canceled()) {
+    Finish(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Push API, section 5: "When a service worker registration is unregistered,
+  // any associated push subscription must be deactivated." To ensure the
+  // service worker registration isn't cleared as we're unregistering, we
+  // unsubscribe first.
+  nsCOMPtr<nsIPushService> pushService =
+      do_GetService("@mozilla.org/push/Service;1");
+  if (NS_WARN_IF(!pushService)) {
+    Unregister();
+    return;
+  }
+  nsCOMPtr<nsIUnsubscribeResultCallback> unsubscribeCallback =
+      new PushUnsubscribeCallback(this);
+  nsresult rv = pushService->Unsubscribe(NS_ConvertUTF8toUTF16(mScope),
+                                         mPrincipal, unsubscribeCallback);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    Unregister();
+  }
+}
+
+void ServiceWorkerUnregisterJob::Unregister() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (Canceled() || !swm) {
+    Finish(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Step 1 of the Unregister algorithm requires checking that the
+  // client origin matches the scope's origin.  We perform this in
+  // registration->update() method directly since we don't have that
+  // client information available here.
+
+  // "Let registration be the result of running [[Get Registration]]
+  // algorithm passing scope as the argument."
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      swm->GetRegistration(mPrincipal, mScope);
+  if (!registration) {
+    // "If registration is null, then, resolve promise with false."
+    Finish(NS_OK);
+    return;
+  }
+
+  // Note, we send the message to remove the registration from disk now. This is
+  // necessary to ensure the registration is removed if the controlled
+  // clients are closed by shutting down the browser.
+  swm->MaybeSendUnregister(mPrincipal, mScope);
+
+  swm->EvictFromBFCache(registration);
+
+  // "Remove scope to registration map[job's scope url]."
+  swm->RemoveRegistration(registration);
+  MOZ_ASSERT(registration->IsUnregistered());
+
+  // "Resolve promise with true"
+  mResult = true;
+  InvokeResultCallbacks(NS_OK);
+
+  // "Invoke Try Clear Registration with registration"
+  if (!registration->IsControllingClients()) {
+    if (registration->IsIdle()) {
+      registration->Clear();
+    } else {
+      registration->ClearWhenIdle();
+    }
+  }
+
+  Finish(NS_OK);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerUnregisterJob.h b/dom/serviceworkers/ServiceWorkerUnregisterJob.h
new file mode 100644
index 0000000000..1e3ffd3ae6
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUnregisterJob.h
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerunregisterjob_h
+#define mozilla_dom_serviceworkerunregisterjob_h
+
+#include "ServiceWorkerJob.h"
+
+namespace mozilla::dom {
+
+class ServiceWorkerUnregisterJob final : public ServiceWorkerJob {
+ public:
+  ServiceWorkerUnregisterJob(nsIPrincipal* aPrincipal,
+                             const nsACString& aScope);
+
+  bool GetResult() const;
+
+ private:
+  class PushUnsubscribeCallback;
+
+  virtual ~ServiceWorkerUnregisterJob();
+
+  virtual void AsyncExecute() override;
+
+  void Unregister();
+
+  bool mResult;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerunregisterjob_h
diff --git a/dom/serviceworkers/ServiceWorkerUpdateJob.cpp b/dom/serviceworkers/ServiceWorkerUpdateJob.cpp
new file mode 100644
index 0000000000..a6726fbf47
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUpdateJob.cpp
@@ -0,0 +1,541 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerUpdateJob.h"
+
+#include "mozilla/Telemetry.h"
+#include "nsIScriptError.h"
+#include "nsIURL.h"
+#include "nsNetUtil.h"
+#include "nsProxyRelease.h"
+#include "ServiceWorkerManager.h"
+#include "ServiceWorkerPrivate.h"
+#include "ServiceWorkerRegistrationInfo.h"
+#include "ServiceWorkerScriptCache.h"
+#include "mozilla/dom/WorkerCommon.h"
+
+namespace mozilla::dom {
+
+using serviceWorkerScriptCache::OnFailure;
+
+namespace {
+
+/**
+ * The spec mandates slightly different behaviors for computing the scope
+ * prefix string in case a Service-Worker-Allowed header is specified versus
+ * when it's not available.
+ *
+ * With the header:
+ *   "Set maxScopeString to "/" concatenated with the strings in maxScope's
+ *    path (including empty strings), separated from each other by "/"."
+ * Without the header:
+ *   "Set maxScopeString to "/" concatenated with the strings, except the last
+ *    string that denotes the script's file name, in registration's registering
+ *    script url's path (including empty strings), separated from each other by
+ *    "/"."
+ *
+ * In simpler terms, if the header is not present, we should only use the
+ * "directory" part of the pathname, and otherwise the entire pathname should be
+ * used.  ScopeStringPrefixMode allows the caller to specify the desired
+ * behavior.
+ */
+enum ScopeStringPrefixMode { eUseDirectory, eUsePath };
+
+nsresult GetRequiredScopeStringPrefix(nsIURI* aScriptURI, nsACString& aPrefix,
+                                      ScopeStringPrefixMode aPrefixMode) {
+  nsresult rv;
+  if (aPrefixMode == eUseDirectory) {
+    nsCOMPtr<nsIURL> scriptURL(do_QueryInterface(aScriptURI));
+    if (NS_WARN_IF(!scriptURL)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    rv = scriptURL->GetDirectory(aPrefix);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  } else if (aPrefixMode == eUsePath) {
+    rv = aScriptURI->GetPathQueryRef(aPrefix);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  } else {
+    MOZ_ASSERT_UNREACHABLE("Invalid value for aPrefixMode");
+  }
+  return NS_OK;
+}
+
+}  // anonymous namespace
+
+class ServiceWorkerUpdateJob::CompareCallback final
+    : public serviceWorkerScriptCache::CompareCallback {
+  RefPtr<ServiceWorkerUpdateJob> mJob;
+
+  ~CompareCallback() = default;
+
+ public:
+  explicit CompareCallback(ServiceWorkerUpdateJob* aJob) : mJob(aJob) {
+    MOZ_ASSERT(mJob);
+  }
+
+  virtual void ComparisonResult(nsresult aStatus, bool aInCacheAndEqual,
+                                OnFailure aOnFailure,
+                                const nsAString& aNewCacheName,
+                                const nsACString& aMaxScope,
+                                nsLoadFlags aLoadFlags) override {
+    mJob->ComparisonResult(aStatus, aInCacheAndEqual, aOnFailure, aNewCacheName,
+                           aMaxScope, aLoadFlags);
+  }
+
+  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerUpdateJob::CompareCallback, override)
+};
+
+class ServiceWorkerUpdateJob::ContinueUpdateRunnable final
+    : public LifeCycleEventCallback {
+  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> mJob;
+  bool mSuccess;
+
+ public:
+  explicit ContinueUpdateRunnable(
+      const nsMainThreadPtrHandle<ServiceWorkerUpdateJob>& aJob)
+      : mJob(aJob), mSuccess(false) {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  void SetResult(bool aResult) override { mSuccess = aResult; }
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    mJob->ContinueUpdateAfterScriptEval(mSuccess);
+    mJob = nullptr;
+    return NS_OK;
+  }
+};
+
+class ServiceWorkerUpdateJob::ContinueInstallRunnable final
+    : public LifeCycleEventCallback {
+  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> mJob;
+  bool mSuccess;
+
+ public:
+  explicit ContinueInstallRunnable(
+      const nsMainThreadPtrHandle<ServiceWorkerUpdateJob>& aJob)
+      : mJob(aJob), mSuccess(false) {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  void SetResult(bool aResult) override { mSuccess = aResult; }
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    mJob->ContinueAfterInstallEvent(mSuccess);
+    mJob = nullptr;
+    return NS_OK;
+  }
+};
+
+ServiceWorkerUpdateJob::ServiceWorkerUpdateJob(
+    nsIPrincipal* aPrincipal, const nsACString& aScope, nsCString aScriptSpec,
+    ServiceWorkerUpdateViaCache aUpdateViaCache)
+    : ServiceWorkerUpdateJob(Type::Update, aPrincipal, aScope,
+                             std::move(aScriptSpec), aUpdateViaCache) {}
+
+already_AddRefed<ServiceWorkerRegistrationInfo>
+ServiceWorkerUpdateJob::GetRegistration() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<ServiceWorkerRegistrationInfo> ref = mRegistration;
+  return ref.forget();
+}
+
+ServiceWorkerUpdateJob::ServiceWorkerUpdateJob(
+    Type aType, nsIPrincipal* aPrincipal, const nsACString& aScope,
+    nsCString aScriptSpec, ServiceWorkerUpdateViaCache aUpdateViaCache)
+    : ServiceWorkerJob(aType, aPrincipal, aScope, std::move(aScriptSpec)),
+      mUpdateViaCache(aUpdateViaCache),
+      mOnFailure(serviceWorkerScriptCache::OnFailure::DoNothing) {}
+
+ServiceWorkerUpdateJob::~ServiceWorkerUpdateJob() = default;
+
+void ServiceWorkerUpdateJob::FailUpdateJob(ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRv.Failed());
+
+  // Cleanup after a failed installation.  This essentially implements
+  // step 13 of the Install algorithm.
+  //
+  //  https://w3c.github.io/ServiceWorker/#installation-algorithm
+  //
+  // The spec currently only runs this after an install event fails,
+  // but we must handle many more internal errors.  So we check for
+  // cleanup on every non-successful exit.
+  if (mRegistration) {
+    // Some kinds of failures indicate there is something broken in the
+    // currently installed registration.  In these cases we want to fully
+    // unregister.
+    if (mOnFailure == OnFailure::Uninstall) {
+      mRegistration->ClearAsCorrupt();
+    }
+
+    // Otherwise just clear the workers we may have created as part of the
+    // update process.
+    else {
+      mRegistration->ClearEvaluating();
+      mRegistration->ClearInstalling();
+    }
+
+    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+    if (swm) {
+      swm->MaybeRemoveRegistration(mRegistration);
+
+      // Also clear the registration on disk if we are forcing uninstall
+      // due to a particularly bad failure.
+      if (mOnFailure == OnFailure::Uninstall) {
+        swm->MaybeSendUnregister(mRegistration->Principal(),
+                                 mRegistration->Scope());
+      }
+    }
+  }
+
+  mRegistration = nullptr;
+
+  Finish(aRv);
+}
+
+void ServiceWorkerUpdateJob::FailUpdateJob(nsresult aRv) {
+  ErrorResult rv(aRv);
+  FailUpdateJob(rv);
+}
+
+void ServiceWorkerUpdateJob::AsyncExecute() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(GetType() == Type::Update);
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (Canceled() || !swm) {
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Invoke Update algorithm:
+  // https://w3c.github.io/ServiceWorker/#update-algorithm
+  //
+  // "Let registration be the result of running the Get Registration algorithm
+  // passing job’s scope url as the argument."
+  RefPtr<ServiceWorkerRegistrationInfo> registration =
+      swm->GetRegistration(mPrincipal, mScope);
+
+  if (!registration) {
+    ErrorResult rv;
+    rv.ThrowTypeError<MSG_SW_UPDATE_BAD_REGISTRATION>(mScope, "uninstalled");
+    FailUpdateJob(rv);
+    return;
+  }
+
+  // "Let newestWorker be the result of running Get Newest Worker algorithm
+  // passing registration as the argument."
+  RefPtr<ServiceWorkerInfo> newest = registration->Newest();
+
+  // "If job’s job type is update, and newestWorker is not null and its script
+  // url does not equal job’s script url, then:
+  //   1. Invoke Reject Job Promise with job and TypeError.
+  //   2. Invoke Finish Job with job and abort these steps."
+  if (newest && !newest->ScriptSpec().Equals(mScriptSpec)) {
+    ErrorResult rv;
+    rv.ThrowTypeError<MSG_SW_UPDATE_BAD_REGISTRATION>(mScope, "changed");
+    FailUpdateJob(rv);
+    return;
+  }
+
+  SetRegistration(registration);
+  Update();
+}
+
+void ServiceWorkerUpdateJob::SetRegistration(
+    ServiceWorkerRegistrationInfo* aRegistration) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(!mRegistration);
+  MOZ_ASSERT(aRegistration);
+  mRegistration = aRegistration;
+}
+
+void ServiceWorkerUpdateJob::Update() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!Canceled());
+
+  // SetRegistration() must be called before Update().
+  MOZ_ASSERT(mRegistration);
+  MOZ_ASSERT(!mRegistration->GetInstalling());
+
+  // Begin the script download and comparison steps starting at step 5
+  // of the Update algorithm.
+
+  RefPtr<ServiceWorkerInfo> workerInfo = mRegistration->Newest();
+  nsAutoString cacheName;
+
+  // If the script has not changed, we need to perform a byte-for-byte
+  // comparison.
+  if (workerInfo && workerInfo->ScriptSpec().Equals(mScriptSpec)) {
+    cacheName = workerInfo->CacheName();
+  }
+
+  RefPtr<CompareCallback> callback = new CompareCallback(this);
+
+  nsresult rv = serviceWorkerScriptCache::Compare(
+      mRegistration, mPrincipal, cacheName, NS_ConvertUTF8toUTF16(mScriptSpec),
+      callback);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(rv);
+    return;
+  }
+}
+
+ServiceWorkerUpdateViaCache ServiceWorkerUpdateJob::GetUpdateViaCache() const {
+  return mUpdateViaCache;
+}
+
+void ServiceWorkerUpdateJob::ComparisonResult(nsresult aStatus,
+                                              bool aInCacheAndEqual,
+                                              OnFailure aOnFailure,
+                                              const nsAString& aNewCacheName,
+                                              const nsACString& aMaxScope,
+                                              nsLoadFlags aLoadFlags) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mOnFailure = aOnFailure;
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (NS_WARN_IF(Canceled() || !swm)) {
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Handle failure of the download or comparison.  This is part of Update
+  // step 5 as "If the algorithm asynchronously completes with null, then:".
+  if (NS_WARN_IF(NS_FAILED(aStatus))) {
+    FailUpdateJob(aStatus);
+    return;
+  }
+
+  // The spec validates the response before performing the byte-for-byte check.
+  // Here we perform the comparison in another module and then validate the
+  // script URL and scope.  Make sure to do this validation before accepting
+  // an byte-for-byte match since the service-worker-allowed header might have
+  // changed since the last time it was installed.
+
+  // This is step 2 the "validate response" section of Update algorithm step 5.
+  // Step 1 is performed in the serviceWorkerScriptCache code.
+
+  nsCOMPtr<nsIURI> scriptURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(scriptURI), mScriptSpec);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  nsCOMPtr<nsIURI> maxScopeURI;
+  if (!aMaxScope.IsEmpty()) {
+    rv = NS_NewURI(getter_AddRefs(maxScopeURI), aMaxScope, nullptr, scriptURI);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
+      return;
+    }
+  }
+
+  nsAutoCString defaultAllowedPrefix;
+  rv = GetRequiredScopeStringPrefix(scriptURI, defaultAllowedPrefix,
+                                    eUseDirectory);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  nsAutoCString maxPrefix(defaultAllowedPrefix);
+  if (maxScopeURI) {
+    rv = GetRequiredScopeStringPrefix(maxScopeURI, maxPrefix, eUsePath);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
+      return;
+    }
+  }
+
+  nsCOMPtr<nsIURI> scopeURI;
+  rv = NS_NewURI(getter_AddRefs(scopeURI), mRegistration->Scope(), nullptr,
+                 scriptURI);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsAutoCString scopeString;
+  rv = scopeURI->GetPathQueryRef(scopeString);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(NS_ERROR_FAILURE);
+    return;
+  }
+
+  if (!StringBeginsWith(scopeString, maxPrefix)) {
+    nsAutoString message;
+    NS_ConvertUTF8toUTF16 reportScope(mRegistration->Scope());
+    NS_ConvertUTF8toUTF16 reportMaxPrefix(maxPrefix);
+
+    rv = nsContentUtils::FormatLocalizedString(
+        message, nsContentUtils::eDOM_PROPERTIES,
+        "ServiceWorkerScopePathMismatch", reportScope, reportMaxPrefix);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to format localized string");
+    swm->ReportToAllClients(mScope, message, u""_ns, u""_ns, 0, 0,
+                            nsIScriptError::errorFlag);
+    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  // The response has been validated, so now we can consider if its a
+  // byte-for-byte match.  This is step 6 of the Update algorithm.
+  if (aInCacheAndEqual) {
+    Finish(NS_OK);
+    return;
+  }
+
+  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_UPDATED, 1);
+
+  // Begin step 7 of the Update algorithm to evaluate the new script.
+  nsLoadFlags flags = aLoadFlags;
+  if (GetUpdateViaCache() == ServiceWorkerUpdateViaCache::None) {
+    flags |= nsIRequest::VALIDATE_ALWAYS;
+  }
+
+  RefPtr<ServiceWorkerInfo> sw = new ServiceWorkerInfo(
+      mRegistration->Principal(), mRegistration->Scope(), mRegistration->Id(),
+      mRegistration->Version(), mScriptSpec, aNewCacheName, flags);
+
+  // If the registration is corrupt enough to force an uninstall if the
+  // upgrade fails, then we want to make sure the upgrade takes effect
+  // if it succeeds.  Therefore force the skip-waiting flag on to replace
+  // the broken worker after install.
+  if (aOnFailure == OnFailure::Uninstall) {
+    sw->SetSkipWaitingFlag();
+  }
+
+  mRegistration->SetEvaluating(sw);
+
+  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> handle(
+      new nsMainThreadPtrHolder<ServiceWorkerUpdateJob>(
+          "ServiceWorkerUpdateJob", this));
+  RefPtr<LifeCycleEventCallback> callback = new ContinueUpdateRunnable(handle);
+
+  ServiceWorkerPrivate* workerPrivate = sw->WorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+  rv = workerPrivate->CheckScriptEvaluation(callback);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+}
+
+void ServiceWorkerUpdateJob::ContinueUpdateAfterScriptEval(
+    bool aScriptEvaluationResult) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (Canceled() || !swm) {
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Step 7.5 of the Update algorithm verifying that the script evaluated
+  // successfully.
+
+  if (NS_WARN_IF(!aScriptEvaluationResult)) {
+    ErrorResult error;
+    error.ThrowTypeError<MSG_SW_SCRIPT_THREW>(mScriptSpec,
+                                              mRegistration->Scope());
+    FailUpdateJob(error);
+    return;
+  }
+
+  Install();
+}
+
+void ServiceWorkerUpdateJob::Install() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(!Canceled());
+
+  MOZ_ASSERT(!mRegistration->GetInstalling());
+
+  // Begin step 2 of the Install algorithm.
+  //
+  //  https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#installation-algorithm
+
+  mRegistration->TransitionEvaluatingToInstalling();
+
+  // Step 6 of the Install algorithm resolving the job promise.
+  InvokeResultCallbacks(NS_OK);
+
+  // Queue a task to fire an event named updatefound at all the
+  // ServiceWorkerRegistration.
+  mRegistration->FireUpdateFound();
+
+  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> handle(
+      new nsMainThreadPtrHolder<ServiceWorkerUpdateJob>(
+          "ServiceWorkerUpdateJob", this));
+  RefPtr<LifeCycleEventCallback> callback = new ContinueInstallRunnable(handle);
+
+  // Send the install event to the worker thread
+  ServiceWorkerPrivate* workerPrivate =
+      mRegistration->GetInstalling()->WorkerPrivate();
+  nsresult rv = workerPrivate->SendLifeCycleEvent(u"install"_ns, callback);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    ContinueAfterInstallEvent(false /* aSuccess */);
+  }
+}
+
+void ServiceWorkerUpdateJob::ContinueAfterInstallEvent(
+    bool aInstallEventSuccess) {
+  if (Canceled()) {
+    return FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+  }
+
+  // If we haven't been canceled we should have a registration.  There appears
+  // to be a path where it gets cleared before we call into here.  Assert
+  // to try to catch this condition, but don't crash in release.
+  MOZ_DIAGNOSTIC_ASSERT(mRegistration);
+  if (!mRegistration) {
+    return FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+  }
+
+  // Continue executing the Install algorithm at step 12.
+
+  // "If installFailed is true"
+  if (NS_WARN_IF(!aInstallEventSuccess)) {
+    // The installing worker is cleaned up by FailUpdateJob().
+    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+    return;
+  }
+
+  // Abort the update Job if the installWorker is null (e.g. when an extension
+  // is shutting down and all its workers have been terminated).
+  if (!mRegistration->GetInstalling()) {
+    return FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
+  }
+
+  mRegistration->TransitionInstallingToWaiting();
+
+  Finish(NS_OK);
+
+  // Step 20 calls for explicitly waiting for queued event tasks to fire.
+  // Instead, we simply queue a runnable to execute Activate.  This ensures the
+  // events are flushed from the queue before proceeding.
+
+  // Step 22 of the Install algorithm.  Activate is executed after the
+  // completion of this job.  The controlling client and skipWaiting checks are
+  // performed in TryToActivate().
+  mRegistration->TryToActivateAsync();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerUpdateJob.h b/dom/serviceworkers/ServiceWorkerUpdateJob.h
new file mode 100644
index 0000000000..536aa72bfc
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUpdateJob.h
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_serviceworkerupdatejob_h
+#define mozilla_dom_serviceworkerupdatejob_h
+
+#include "ServiceWorkerJob.h"
+#include "ServiceWorkerRegistration.h"
+
+#include "nsIRequest.h"
+
+namespace mozilla::dom {
+
+namespace serviceWorkerScriptCache {
+enum class OnFailure : uint8_t;
+}  // namespace serviceWorkerScriptCache
+
+class ServiceWorkerManager;
+class ServiceWorkerRegistrationInfo;
+
+// A job class that performs the Update and Install algorithms from the
+// service worker spec.  This class is designed to be inherited and customized
+// as a different job type.  This is necessary because the register job
+// performs largely the same operations as the update job, but has a few
+// different starting steps.
+class ServiceWorkerUpdateJob : public ServiceWorkerJob {
+ public:
+  // Construct an update job to be used only for updates.
+  ServiceWorkerUpdateJob(nsIPrincipal* aPrincipal, const nsACString& aScope,
+                         nsCString aScriptSpec,
+                         ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  already_AddRefed<ServiceWorkerRegistrationInfo> GetRegistration() const;
+
+ protected:
+  // Construct an update job that is overriden as another job type.
+  ServiceWorkerUpdateJob(Type aType, nsIPrincipal* aPrincipal,
+                         const nsACString& aScope, nsCString aScriptSpec,
+                         ServiceWorkerUpdateViaCache aUpdateViaCache);
+
+  virtual ~ServiceWorkerUpdateJob();
+
+  // FailUpdateJob() must be called if an update job needs Finish() with
+  // an error.
+  void FailUpdateJob(ErrorResult& aRv);
+
+  void FailUpdateJob(nsresult aRv);
+
+  // The entry point when the update job is being used directly.  Job
+  // types overriding this class should override this method to
+  // customize behavior.
+  virtual void AsyncExecute() override;
+
+  // Set the registration to be operated on by Update() or to be immediately
+  // returned as a result of the job.  This must be called before Update().
+  void SetRegistration(ServiceWorkerRegistrationInfo* aRegistration);
+
+  // Execute the bulk of the update job logic using the registration defined
+  // by a previous SetRegistration() call.  This can be called by the overriden
+  // AsyncExecute() to complete the job.  The Update() method will always call
+  // Finish().  This method corresponds to the spec Update algorithm.
+  void Update();
+
+  ServiceWorkerUpdateViaCache GetUpdateViaCache() const;
+
+ private:
+  class CompareCallback;
+  class ContinueUpdateRunnable;
+  class ContinueInstallRunnable;
+
+  // Utility method called after a script is loaded and compared to
+  // our current cached script.
+  void ComparisonResult(nsresult aStatus, bool aInCacheAndEqual,
+                        serviceWorkerScriptCache::OnFailure aOnFailure,
+                        const nsAString& aNewCacheName,
+                        const nsACString& aMaxScope, nsLoadFlags aLoadFlags);
+
+  // Utility method called after evaluating the worker script.
+  void ContinueUpdateAfterScriptEval(bool aScriptEvaluationResult);
+
+  // Utility method corresponding to the spec Install algorithm.
+  void Install();
+
+  // Utility method called after the install event is handled.
+  void ContinueAfterInstallEvent(bool aInstallEventSuccess);
+
+  RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
+  ServiceWorkerUpdateViaCache mUpdateViaCache;
+  serviceWorkerScriptCache::OnFailure mOnFailure;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_serviceworkerupdatejob_h
diff --git a/dom/serviceworkers/ServiceWorkerUtils.cpp b/dom/serviceworkers/ServiceWorkerUtils.cpp
new file mode 100644
index 0000000000..630d667c6e
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUtils.cpp
@@ -0,0 +1,217 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ServiceWorkerUtils.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StaticPrefs_extensions.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/ClientInfo.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/ServiceWorkerGlobalScopeBinding.h"
+#include "mozilla/dom/ServiceWorkerRegistrarTypes.h"
+#include "nsCOMPtr.h"
+#include "nsIPrincipal.h"
+#include "nsIURL.h"
+#include "nsPrintfCString.h"
+
+namespace mozilla::dom {
+
+static bool IsServiceWorkersTestingEnabledInWindow(JSObject* const aGlobal) {
+  if (const nsCOMPtr<nsPIDOMWindowInner> innerWindow =
+          Navigator::GetWindowFromGlobal(aGlobal)) {
+    if (auto* bc = innerWindow->GetBrowsingContext()) {
+      return bc->Top()->ServiceWorkersTestingEnabled();
+    }
+  }
+  return false;
+}
+
+static bool IsInPrivateBrowsing(JSContext* const aCx) {
+  if (const nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx)) {
+    if (const nsCOMPtr<nsIPrincipal> principal = global->PrincipalOrNull()) {
+      return principal->GetPrivateBrowsingId() > 0;
+    }
+  }
+  return false;
+}
+
+bool ServiceWorkersEnabled(JSContext* aCx, JSObject* aGlobal) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!StaticPrefs::dom_serviceWorkers_enabled()) {
+    return false;
+  }
+
+  // xpc::CurrentNativeGlobal below requires rooting
+  JS::Rooted<JSObject*> global(aCx, aGlobal);
+
+  if (IsInPrivateBrowsing(aCx)) {
+    return false;
+  }
+
+  // Allow a webextension principal to register a service worker script with
+  // a moz-extension url only if 'extensions.service_worker_register.allowed'
+  // is true.
+  if (!StaticPrefs::extensions_serviceWorkerRegister_allowed()) {
+    nsIPrincipal* principal = nsContentUtils::SubjectPrincipal(aCx);
+    if (principal && BasePrincipal::Cast(principal)->AddonPolicy()) {
+      return false;
+    }
+  }
+
+  if (IsSecureContextOrObjectIsFromSecureContext(aCx, global)) {
+    return true;
+  }
+
+  return StaticPrefs::dom_serviceWorkers_testing_enabled() ||
+         IsServiceWorkersTestingEnabledInWindow(global);
+}
+
+bool ServiceWorkerVisible(JSContext* aCx, JSObject* aGlobal) {
+  if (NS_IsMainThread()) {
+    // We want to expose ServiceWorker interface only when
+    // navigator.serviceWorker is available. Currently it may not be available
+    // with some reasons:
+    // 1. navigator.serviceWorker is not supported in workers. (bug 1131324)
+    return ServiceWorkersEnabled(aCx, aGlobal);
+  }
+
+  // We are already in ServiceWorker and interfaces need to be exposed for e.g.
+  // globalThis.registration.serviceWorker. Note that navigator.serviceWorker
+  // is still not supported. (bug 1131324)
+  return IS_INSTANCE_OF(ServiceWorkerGlobalScope, aGlobal);
+}
+
+bool ServiceWorkerRegistrationDataIsValid(
+    const ServiceWorkerRegistrationData& aData) {
+  return !aData.scope().IsEmpty() && !aData.currentWorkerURL().IsEmpty() &&
+         !aData.cacheName().IsEmpty();
+}
+
+namespace {
+
+void CheckForSlashEscapedCharsInPath(nsIURI* aURI, const char* aURLDescription,
+                                     ErrorResult& aRv) {
+  MOZ_ASSERT(aURI);
+
+  // A URL that can't be downcast to a standard URL is an invalid URL and should
+  // be treated as such and fail with SecurityError.
+  nsCOMPtr<nsIURL> url(do_QueryInterface(aURI));
+  if (NS_WARN_IF(!url)) {
+    // This really should not happen, since the caller checks that we
+    // have an http: or https: URL!
+    aRv.ThrowInvalidStateError("http: or https: URL without a concept of path");
+    return;
+  }
+
+  nsAutoCString path;
+  nsresult rv = url->GetFilePath(path);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    // Again, should not happen.
+    aRv.ThrowInvalidStateError("http: or https: URL without a concept of path");
+    return;
+  }
+
+  ToLowerCase(path);
+  if (path.Find("%2f") != kNotFound || path.Find("%5c") != kNotFound) {
+    nsPrintfCString err("%s contains %%2f or %%5c", aURLDescription);
+    aRv.ThrowTypeError(err);
+  }
+}
+
+}  // anonymous namespace
+
+void ServiceWorkerScopeAndScriptAreValid(const ClientInfo& aClientInfo,
+                                         nsIURI* aScopeURI, nsIURI* aScriptURI,
+                                         ErrorResult& aRv) {
+  MOZ_DIAGNOSTIC_ASSERT(aScopeURI);
+  MOZ_DIAGNOSTIC_ASSERT(aScriptURI);
+
+  auto principalOrErr = aClientInfo.GetPrincipal();
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    aRv.ThrowInvalidStateError("Can't make security decisions about Client");
+    return;
+  }
+
+  auto hasHTTPScheme = [](nsIURI* aURI) -> bool {
+    return aURI->SchemeIs("http") || aURI->SchemeIs("https");
+  };
+  auto hasMozExtScheme = [](nsIURI* aURI) -> bool {
+    return aURI->SchemeIs("moz-extension");
+  };
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+
+  auto isExtension = !!BasePrincipal::Cast(principal)->AddonPolicy();
+  auto hasValidURISchemes = !isExtension ? hasHTTPScheme : hasMozExtScheme;
+
+  // https://w3c.github.io/ServiceWorker/#start-register-algorithm step 3.
+  if (!hasValidURISchemes(aScriptURI)) {
+    auto message = !isExtension
+                       ? "Script URL's scheme is not 'http' or 'https'"_ns
+                       : "Script URL's scheme is not 'moz-extension'"_ns;
+    aRv.ThrowTypeError(message);
+    return;
+  }
+
+  // https://w3c.github.io/ServiceWorker/#start-register-algorithm step 4.
+  CheckForSlashEscapedCharsInPath(aScriptURI, "script URL", aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  // https://w3c.github.io/ServiceWorker/#start-register-algorithm step 8.
+  if (!hasValidURISchemes(aScopeURI)) {
+    auto message = !isExtension
+                       ? "Scope URL's scheme is not 'http' or 'https'"_ns
+                       : "Scope URL's scheme is not 'moz-extension'"_ns;
+    aRv.ThrowTypeError(message);
+    return;
+  }
+
+  // https://w3c.github.io/ServiceWorker/#start-register-algorithm step 9.
+  CheckForSlashEscapedCharsInPath(aScopeURI, "scope URL", aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  // The refs should really be empty coming in here, but if someone
+  // injects bad data into IPC, who knows.  So let's revalidate that.
+  nsAutoCString ref;
+  Unused << aScopeURI->GetRef(ref);
+  if (NS_WARN_IF(!ref.IsEmpty())) {
+    aRv.ThrowSecurityError("Non-empty fragment on scope URL");
+    return;
+  }
+
+  Unused << aScriptURI->GetRef(ref);
+  if (NS_WARN_IF(!ref.IsEmpty())) {
+    aRv.ThrowSecurityError("Non-empty fragment on script URL");
+    return;
+  }
+
+  // Unfortunately we don't seem to have an obvious window id here; in
+  // particular ClientInfo does not have one.
+  nsresult rv = principal->CheckMayLoadWithReporting(
+      aScopeURI, false /* allowIfInheritsPrincipal */, 0 /* innerWindowID */);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.ThrowSecurityError("Scope URL is not same-origin with Client");
+    return;
+  }
+
+  rv = principal->CheckMayLoadWithReporting(
+      aScriptURI, false /* allowIfInheritsPrincipal */, 0 /* innerWindowID */);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.ThrowSecurityError("Script URL is not same-origin with Client");
+    return;
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/serviceworkers/ServiceWorkerUtils.h b/dom/serviceworkers/ServiceWorkerUtils.h
new file mode 100644
index 0000000000..8140c3225a
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerUtils.h
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _mozilla_dom_ServiceWorkerUtils_h
+#define _mozilla_dom_ServiceWorkerUtils_h
+
+#include "mozilla/MozPromise.h"
+#include "mozilla/dom/IPCNavigationPreloadState.h"
+#include "mozilla/dom/ServiceWorkerRegistrationDescriptor.h"
+#include "nsTArray.h"
+
+class nsIURI;
+
+namespace mozilla {
+
+class CopyableErrorResult;
+class ErrorResult;
+
+namespace dom {
+
+class ClientInfo;
+class ServiceWorkerRegistrationData;
+class ServiceWorkerRegistrationDescriptor;
+struct NavigationPreloadState;
+
+using ServiceWorkerRegistrationPromise =
+    MozPromise<ServiceWorkerRegistrationDescriptor, CopyableErrorResult, false>;
+
+using ServiceWorkerRegistrationListPromise =
+    MozPromise<CopyableTArray<ServiceWorkerRegistrationDescriptor>,
+               CopyableErrorResult, false>;
+
+using NavigationPreloadStatePromise =
+    MozPromise<IPCNavigationPreloadState, CopyableErrorResult, false>;
+
+using ServiceWorkerRegistrationCallback =
+    std::function<void(const ServiceWorkerRegistrationDescriptor&)>;
+
+using ServiceWorkerRegistrationListCallback =
+    std::function<void(const nsTArray<ServiceWorkerRegistrationDescriptor>&)>;
+
+using ServiceWorkerBoolCallback = std::function<void(bool)>;
+
+using ServiceWorkerFailureCallback = std::function<void(ErrorResult&&)>;
+
+using NavigationPreloadGetStateCallback =
+    std::function<void(NavigationPreloadState&&)>;
+
+bool ServiceWorkerRegistrationDataIsValid(
+    const ServiceWorkerRegistrationData& aData);
+
+void ServiceWorkerScopeAndScriptAreValid(const ClientInfo& aClientInfo,
+                                         nsIURI* aScopeURI, nsIURI* aScriptURI,
+                                         ErrorResult& aRv);
+
+bool ServiceWorkersEnabled(JSContext* aCx, JSObject* aGlobal);
+
+bool ServiceWorkerVisible(JSContext* aCx, JSObject* aGlobal);
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // _mozilla_dom_ServiceWorkerUtils_h
diff --git a/dom/serviceworkers/docs/telemetry.md b/dom/serviceworkers/docs/telemetry.md
new file mode 100644
index 0000000000..864b6bec25
--- /dev/null
+++ b/dom/serviceworkers/docs/telemetry.md
@@ -0,0 +1,42 @@
+1. ServiceWorkerRegistrar loading. The ability to determine whether to intercept
+   is based on this. (Although if not loaded, it's possible to just not intercept.)
+
+2. Process launching. ServiceWorkers need to be launched into a process, and
+   under fission this will almost certainly be a new process, and at startup we
+   might not be able to depend on preallocated processes.
+
+3. Permission transmission.
+
+4. Worker launching. The act of spawning the worker thread in the content process.
+
+5. Script loading.
+        Cache API opening for the given origin.
+        QuotaManager storage and temporary storage initialization, which has to
+        happen before the Cache API can start accessing its files.
+
+6. Fetch request serialization / deserialization to parent process.
+
+7. InterceptedHttpChannel creation for the fetch request.
+
+8. Creating FetchEvent related objects and propagting to the content process
+   worker thread.
+
+9. Handle FetchEvent by the ServiceWorker's script.
+
+10. Propagating the response from ServiceWorker to parent process.
+
+11. Synthesizing the response for the intercepted channel.
+
+12. Reset the interception by redirecting to a normal http channel or cancel the
+    interception.
+
+13. Push data into the intercepted channel.
+
+Telemetry probes cover:
+
+1: SERVICE_WORKER_REGISTRATION_LOADING
+2-4: SERVICE_WORKER_LAUNCH_TIME_2
+2-5, 7-13: SERVICE_WORKER_FETCH_INTERCEPTION_DURATION_MS_2
+7-9: SERVICE_WORKER_FETCH_EVENT_DISPATCH_MS_2
+11: SERVICE_WORKER_FETCH_EVENT_FINISH_SYNTHESIZED_RESPONSE_MS_2
+12: SERVICE_WORKER_FETCH_EVENT_CHANNEL_RESET_MS_2
diff --git a/dom/serviceworkers/moz.build b/dom/serviceworkers/moz.build
new file mode 100644
index 0000000000..b42f765fc0
--- /dev/null
+++ b/dom/serviceworkers/moz.build
@@ -0,0 +1,131 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Core", "DOM: Service Workers")
+
+# Public stuff.
+EXPORTS.mozilla.dom += [
+    "FetchEventOpChild.h",
+    "FetchEventOpParent.h",
+    "FetchEventOpProxyChild.h",
+    "FetchEventOpProxyParent.h",
+    "NavigationPreloadManager.h",
+    "ServiceWorker.h",
+    "ServiceWorkerActors.h",
+    "ServiceWorkerChild.h",
+    "ServiceWorkerCloneData.h",
+    "ServiceWorkerContainer.h",
+    "ServiceWorkerContainerChild.h",
+    "ServiceWorkerContainerParent.h",
+    "ServiceWorkerDescriptor.h",
+    "ServiceWorkerEvents.h",
+    "ServiceWorkerInfo.h",
+    "ServiceWorkerInterceptController.h",
+    "ServiceWorkerIPCUtils.h",
+    "ServiceWorkerManager.h",
+    "ServiceWorkerManagerChild.h",
+    "ServiceWorkerManagerParent.h",
+    "ServiceWorkerOp.h",
+    "ServiceWorkerOpPromise.h",
+    "ServiceWorkerParent.h",
+    "ServiceWorkerRegistrar.h",
+    "ServiceWorkerRegistration.h",
+    "ServiceWorkerRegistrationChild.h",
+    "ServiceWorkerRegistrationDescriptor.h",
+    "ServiceWorkerRegistrationInfo.h",
+    "ServiceWorkerRegistrationParent.h",
+    "ServiceWorkerShutdownState.h",
+    "ServiceWorkerUtils.h",
+]
+
+UNIFIED_SOURCES += [
+    "FetchEventOpChild.cpp",
+    "FetchEventOpParent.cpp",
+    "FetchEventOpProxyChild.cpp",
+    "FetchEventOpProxyParent.cpp",
+    "NavigationPreloadManager.cpp",
+    "ServiceWorker.cpp",
+    "ServiceWorkerActors.cpp",
+    "ServiceWorkerChild.cpp",
+    "ServiceWorkerCloneData.cpp",
+    "ServiceWorkerContainer.cpp",
+    "ServiceWorkerContainerChild.cpp",
+    "ServiceWorkerContainerParent.cpp",
+    "ServiceWorkerContainerProxy.cpp",
+    "ServiceWorkerDescriptor.cpp",
+    "ServiceWorkerEvents.cpp",
+    "ServiceWorkerInfo.cpp",
+    "ServiceWorkerInterceptController.cpp",
+    "ServiceWorkerJob.cpp",
+    "ServiceWorkerJobQueue.cpp",
+    "ServiceWorkerManager.cpp",
+    "ServiceWorkerManagerParent.cpp",
+    "ServiceWorkerOp.cpp",
+    "ServiceWorkerParent.cpp",
+    "ServiceWorkerPrivate.cpp",
+    "ServiceWorkerProxy.cpp",
+    "ServiceWorkerQuotaUtils.cpp",
+    "ServiceWorkerRegisterJob.cpp",
+    "ServiceWorkerRegistrar.cpp",
+    "ServiceWorkerRegistration.cpp",
+    "ServiceWorkerRegistrationChild.cpp",
+    "ServiceWorkerRegistrationDescriptor.cpp",
+    "ServiceWorkerRegistrationInfo.cpp",
+    "ServiceWorkerRegistrationParent.cpp",
+    "ServiceWorkerRegistrationProxy.cpp",
+    "ServiceWorkerScriptCache.cpp",
+    "ServiceWorkerShutdownBlocker.cpp",
+    "ServiceWorkerShutdownState.cpp",
+    "ServiceWorkerUnregisterCallback.cpp",
+    "ServiceWorkerUnregisterJob.cpp",
+    "ServiceWorkerUpdateJob.cpp",
+    "ServiceWorkerUtils.cpp",
+]
+
+IPDL_SOURCES += [
+    "IPCNavigationPreloadState.ipdlh",
+    "IPCServiceWorkerDescriptor.ipdlh",
+    "IPCServiceWorkerRegistrationDescriptor.ipdlh",
+    "PFetchEventOp.ipdl",
+    "PFetchEventOpProxy.ipdl",
+    "PServiceWorker.ipdl",
+    "PServiceWorkerContainer.ipdl",
+    "PServiceWorkerManager.ipdl",
+    "PServiceWorkerRegistration.ipdl",
+    "ServiceWorkerOpArgs.ipdlh",
+    "ServiceWorkerRegistrarTypes.ipdlh",
+]
+
+LOCAL_INCLUDES += [
+    # For HttpBaseChannel.h dependencies
+    "/netwerk/base",
+    # For HttpBaseChannel.h
+    "/netwerk/protocol/http",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+
+MOCHITEST_MANIFESTS += [
+    "test/mochitest-dFPI.toml",
+    "test/mochitest.toml",
+    "test/performance/perftest.toml",
+]
+
+MOCHITEST_CHROME_MANIFESTS += [
+    "test/chrome-dFPI.toml",
+    "test/chrome.toml",
+]
+
+BROWSER_CHROME_MANIFESTS += [
+    "test/browser-dFPI.toml",
+    "test/browser.toml",
+    "test/isolated/multi-e10s-update/browser.toml",
+]
+
+TEST_DIRS += ["test/gtest"]
diff --git a/dom/serviceworkers/test/ForceRefreshChild.sys.mjs b/dom/serviceworkers/test/ForceRefreshChild.sys.mjs
new file mode 100644
index 0000000000..b2b965be9e
--- /dev/null
+++ b/dom/serviceworkers/test/ForceRefreshChild.sys.mjs
@@ -0,0 +1,12 @@
+export class ForceRefreshChild extends JSWindowActorChild {
+  constructor() {
+    super();
+  }
+
+  handleEvent(evt) {
+    this.sendAsyncMessage("test:event", {
+      type: evt.type,
+      detail: evt.details,
+    });
+  }
+}
diff --git a/dom/serviceworkers/test/ForceRefreshParent.sys.mjs b/dom/serviceworkers/test/ForceRefreshParent.sys.mjs
new file mode 100644
index 0000000000..69b0c1be42
--- /dev/null
+++ b/dom/serviceworkers/test/ForceRefreshParent.sys.mjs
@@ -0,0 +1,79 @@
+var maxCacheLoadCount = 3;
+var cachedLoadCount = 0;
+var baseLoadCount = 0;
+var done = false;
+
+export class ForceRefreshParent extends JSWindowActorParent {
+  constructor() {
+    super();
+  }
+
+  receiveMessage(msg) {
+    // if done is called, ignore the msg.
+    if (done) {
+      return;
+    }
+    if (msg.data.type === "base-load") {
+      baseLoadCount += 1;
+      if (cachedLoadCount === maxCacheLoadCount) {
+        ForceRefreshParent.SimpleTest.is(
+          baseLoadCount,
+          2,
+          "cached load should occur before second base load"
+        );
+        done = true;
+        ForceRefreshParent.done();
+        return;
+      }
+      if (baseLoadCount !== 1) {
+        ForceRefreshParent.SimpleTest.ok(
+          false,
+          "base load without cached load should only occur once"
+        );
+        done = true;
+        ForceRefreshParent.done();
+      }
+    } else if (msg.data.type === "base-register") {
+      ForceRefreshParent.SimpleTest.ok(
+        !cachedLoadCount,
+        "cached load should not occur before base register"
+      );
+      ForceRefreshParent.SimpleTest.is(
+        baseLoadCount,
+        1,
+        "register should occur after first base load"
+      );
+    } else if (msg.data.type === "base-sw-ready") {
+      ForceRefreshParent.SimpleTest.ok(
+        !cachedLoadCount,
+        "cached load should not occur before base ready"
+      );
+      ForceRefreshParent.SimpleTest.is(
+        baseLoadCount,
+        1,
+        "ready should occur after first base load"
+      );
+      ForceRefreshParent.refresh();
+    } else if (msg.data.type === "cached-load") {
+      ForceRefreshParent.SimpleTest.ok(
+        cachedLoadCount < maxCacheLoadCount,
+        "cached load should not occur too many times"
+      );
+      ForceRefreshParent.SimpleTest.is(
+        baseLoadCount,
+        1,
+        "cache load occur after first base load"
+      );
+      cachedLoadCount += 1;
+      if (cachedLoadCount < maxCacheLoadCount) {
+        ForceRefreshParent.refresh();
+        return;
+      }
+      ForceRefreshParent.forceRefresh();
+    } else if (msg.data.type === "cached-failure") {
+      ForceRefreshParent.SimpleTest.ok(false, "failure: " + msg.data.detail);
+      done = true;
+      ForceRefreshParent.done();
+    }
+  }
+}
diff --git a/dom/serviceworkers/test/abrupt_completion_worker.js b/dom/serviceworkers/test/abrupt_completion_worker.js
new file mode 100644
index 0000000000..7afebc6d45
--- /dev/null
+++ b/dom/serviceworkers/test/abrupt_completion_worker.js
@@ -0,0 +1,18 @@
+function setMessageHandler(response) {
+  onmessage = e => {
+    e.source.postMessage(response);
+  };
+}
+
+setMessageHandler("handler-before-throw");
+
+// importScripts will throw when the ServiceWorker is past the "intalling" state.
+importScripts(`empty.js?${Date.now()}`);
+
+// When importScripts throws an uncaught exception, these calls should never be
+// made and the message handler should remain responding "handler-before-throw".
+setMessageHandler("handler-after-throw");
+
+// There needs to be a fetch handler to avoid the no-fetch optimizaiton,
+// which will skip starting up this worker.
+onfetch = e => e.respondWith(new Response("handler-after-throw"));
diff --git a/dom/serviceworkers/test/activate_event_error_worker.js b/dom/serviceworkers/test/activate_event_error_worker.js
new file mode 100644
index 0000000000..a875f27d92
--- /dev/null
+++ b/dom/serviceworkers/test/activate_event_error_worker.js
@@ -0,0 +1,4 @@
+// Worker that errors on receiving an activate event.
+onactivate = function (e) {
+  undefined.doSomething;
+};
diff --git a/dom/serviceworkers/test/async_waituntil_worker.js b/dom/serviceworkers/test/async_waituntil_worker.js
new file mode 100644
index 0000000000..f830fc6f83
--- /dev/null
+++ b/dom/serviceworkers/test/async_waituntil_worker.js
@@ -0,0 +1,53 @@
+var keepAlivePromise;
+var resolvePromise;
+var result = "Failed";
+
+onactivate = function (event) {
+  event.waitUntil(clients.claim());
+};
+
+onmessage = function (event) {
+  if (event.data === "Start") {
+    event.waitUntil(Promise.reject());
+
+    keepAlivePromise = new Promise(function (resolve, reject) {
+      resolvePromise = resolve;
+    });
+
+    result = "Success";
+    event.waitUntil(keepAlivePromise);
+    event.source.postMessage("Started");
+  } else if (event.data === "Result") {
+    event.source.postMessage(result);
+    if (resolvePromise !== undefined) {
+      resolvePromise();
+    }
+  }
+};
+
+addEventListener("fetch", e => {
+  let respondWithPromise = new Promise(function (res, rej) {
+    setTimeout(() => {
+      res(new Response("ok"));
+    }, 0);
+  });
+  e.respondWith(respondWithPromise);
+  // Test that waitUntil can be called in the promise handler of the existing
+  // lifetime extension promise.
+  respondWithPromise.then(() => {
+    e.waitUntil(
+      clients.matchAll().then(cls => {
+        dump(`matchAll returned ${cls.length} client(s) with URLs:\n`);
+        cls.forEach(cl => {
+          dump(`${cl.url}\n`);
+        });
+
+        if (cls.length != 1) {
+          dump("ERROR: no controlled clients.\n");
+        }
+        client = cls[0];
+        client.postMessage("Done");
+      })
+    );
+  });
+});
diff --git a/dom/serviceworkers/test/blocking_install_event_worker.js b/dom/serviceworkers/test/blocking_install_event_worker.js
new file mode 100644
index 0000000000..8ca6201316
--- /dev/null
+++ b/dom/serviceworkers/test/blocking_install_event_worker.js
@@ -0,0 +1,22 @@
+function postMessageToTest(msg) {
+  return clients.matchAll({ includeUncontrolled: true }).then(list => {
+    for (var client of list) {
+      if (client.url.endsWith("test_install_event_gc.html")) {
+        client.postMessage(msg);
+        break;
+      }
+    }
+  });
+}
+
+addEventListener("install", evt => {
+  // This must be a simple promise to trigger the CC failure.
+  evt.waitUntil(new Promise(function () {}));
+  postMessageToTest({ type: "INSTALL_EVENT" });
+});
+
+addEventListener("message", evt => {
+  if (evt.data.type === "ping") {
+    postMessageToTest({ type: "pong" });
+  }
+});
diff --git a/dom/serviceworkers/test/browser-common.toml b/dom/serviceworkers/test/browser-common.toml
new file mode 100644
index 0000000000..66e31e5f7f
--- /dev/null
+++ b/dom/serviceworkers/test/browser-common.toml
@@ -0,0 +1,64 @@
+[DEFAULT]
+support-files = [
+  "browser_base_force_refresh.html",
+  "browser_cached_force_refresh.html",
+  "browser_head.js",
+  "download/window.html",
+  "download/worker.js",
+  "download_canceled/page_download_canceled.html",
+  "download_canceled/server-stream-download.sjs",
+  "download_canceled/sw_download_canceled.js",
+  "fetch.js",
+  "file_userContextId_openWindow.js",
+  "force_refresh_browser_worker.js",
+  "ForceRefreshChild.sys.mjs",
+  "ForceRefreshParent.sys.mjs",
+  "empty.html",
+  "empty_with_utils.html",
+  "empty.js",
+  "intercepted_channel_process_swap_worker.js",
+  "navigationPreload_page.html",
+  "network_with_utils.html",
+  "page_post_controlled.html",
+  "redirect.sjs",
+  "simple_fetch_worker.js",
+  "storage_recovery_worker.sjs",
+  "sw_respondwith_serviceworker.js",
+  "sw_with_navigationPreload.js",
+  "utils.js",
+]
+
+["browser_antitracking.js"]
+
+["browser_antitracking_subiframes.js"]
+
+["browser_devtools_serviceworker_interception.js"]
+skip-if = ["serviceworker_e10s"]
+
+["browser_download.js"]
+
+["browser_download_canceled.js"]
+skip-if = ["verify"]
+
+["browser_force_refresh.js"]
+skip-if = ["verify"] # Bug 1603340
+
+["browser_intercepted_channel_process_swap.js"]
+
+["browser_intercepted_worker_script.js"]
+
+["browser_navigationPreload_read_after_respondWith.js"]
+
+["browser_navigation_fetch_fault_handling.js"]
+
+["browser_remote_type_process_swap.js"]
+
+["browser_storage_permission.js"]
+skip-if = ["true"] # Crashes: @ mozilla::dom::ServiceWorkerManagerService::PropagateUnregister(unsigned long, mozilla::ipc::PrincipalInfo const&, nsTSubstring<char16_t> const&), #Bug 1578337
+
+["browser_storage_recovery.js"]
+
+["browser_unregister_with_containers.js"]
+
+["browser_userContextId_openWindow.js"]
+skip-if = ["true"] # See bug 1769437.
diff --git a/dom/serviceworkers/test/browser-dFPI.toml b/dom/serviceworkers/test/browser-dFPI.toml
new file mode 100644
index 0000000000..4d0f9b820e
--- /dev/null
+++ b/dom/serviceworkers/test/browser-dFPI.toml
@@ -0,0 +1,6 @@
+[DEFAULT]
+# Enable dFPI(cookieBehavior 5) for service worker tests.
+prefs = ["network.cookie.cookieBehavior=5"]
+dupe-manifest = true
+
+["include:browser-common.toml"]
diff --git a/dom/serviceworkers/test/browser.toml b/dom/serviceworkers/test/browser.toml
new file mode 100644
index 0000000000..f6ce53e074
--- /dev/null
+++ b/dom/serviceworkers/test/browser.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+dupe-manifest = true
+
+["include:browser-common.toml"]
diff --git a/dom/serviceworkers/test/browser_antitracking.js b/dom/serviceworkers/test/browser_antitracking.js
new file mode 100644
index 0000000000..e42a030595
--- /dev/null
+++ b/dom/serviceworkers/test/browser_antitracking.js
@@ -0,0 +1,106 @@
+const BEHAVIOR_ACCEPT = Ci.nsICookieService.BEHAVIOR_ACCEPT;
+const BEHAVIOR_REJECT_TRACKER = Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER;
+
+let { UrlClassifierTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/UrlClassifierTestUtils.sys.mjs"
+);
+
+const TOP_DOMAIN = "http://mochi.test:8888/";
+const SW_DOMAIN = "https://tracking.example.org/";
+
+const TOP_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  TOP_DOMAIN
+);
+const SW_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  SW_DOMAIN
+);
+
+const TOP_EMPTY_PAGE = `${TOP_TEST_ROOT}empty_with_utils.html`;
+const SW_REGISTER_PAGE = `${SW_TEST_ROOT}empty_with_utils.html`;
+const SW_IFRAME_PAGE = `${SW_TEST_ROOT}page_post_controlled.html`;
+// An empty script suffices for our SW needs; it's by definition no-fetch.
+const SW_REL_SW_SCRIPT = "empty.js";
+
+/**
+ * Set up a no-fetch-optimized ServiceWorker on a domain that will be covered by
+ * tracking protection (but is not yet).  Once the SW is installed, activate TP
+ * and create a tab that embeds that tracking-site in an iframe.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["network.cookie.cookieBehavior", BEHAVIOR_ACCEPT],
+    ],
+  });
+
+  // Open the top-level page.
+  info("Opening a new tab: " + SW_REGISTER_PAGE);
+  let topTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_PAGE,
+  });
+
+  // ## Install SW
+  info("Installing SW");
+  await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ sw: SW_REL_SW_SCRIPT }],
+    async function ({ sw }) {
+      // Waive the xray to use the content utils.js script functions.
+      await content.wrappedJSObject.registerAndWaitForActive(sw);
+    }
+  );
+
+  // Enable Anti-tracking.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.trackingprotection.enabled", false],
+      ["privacy.trackingprotection.pbmode.enabled", false],
+      ["privacy.trackingprotection.annotate_channels", true],
+      ["network.cookie.cookieBehavior", BEHAVIOR_REJECT_TRACKER],
+    ],
+  });
+  await UrlClassifierTestUtils.addTestTrackers();
+
+  // Open the top-level URL.
+  info("Loading a new top-level URL: " + TOP_EMPTY_PAGE);
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    topTab.linkedBrowser
+  );
+  BrowserTestUtils.startLoadingURIString(topTab.linkedBrowser, TOP_EMPTY_PAGE);
+  await browserLoadedPromise;
+
+  // Create Iframe in the top-level page and verify its state.
+  let { controlled } = await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ url: SW_IFRAME_PAGE }],
+    async function ({ url }) {
+      const payload =
+        await content.wrappedJSObject.createIframeAndWaitForMessage(url);
+      return payload;
+    }
+  );
+
+  ok(!controlled, "Should not be controlled!");
+
+  // ## Cleanup
+  info("Loading the SW unregister page: " + SW_REGISTER_PAGE);
+  browserLoadedPromise = BrowserTestUtils.browserLoaded(topTab.linkedBrowser);
+  BrowserTestUtils.startLoadingURIString(
+    topTab.linkedBrowser,
+    SW_REGISTER_PAGE
+  );
+  await browserLoadedPromise;
+
+  await SpecialPowers.spawn(topTab.linkedBrowser, [], async function () {
+    await content.wrappedJSObject.unregisterAll();
+  });
+
+  // Close the testing tab.
+  BrowserTestUtils.removeTab(topTab);
+});
diff --git a/dom/serviceworkers/test/browser_antitracking_subiframes.js b/dom/serviceworkers/test/browser_antitracking_subiframes.js
new file mode 100644
index 0000000000..b19ee83063
--- /dev/null
+++ b/dom/serviceworkers/test/browser_antitracking_subiframes.js
@@ -0,0 +1,106 @@
+const BEHAVIOR_REJECT_TRACKER = Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER;
+
+const TOP_DOMAIN = "http://mochi.test:8888/";
+const SW_DOMAIN = "https://example.org/";
+
+const TOP_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  TOP_DOMAIN
+);
+const SW_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  SW_DOMAIN
+);
+
+const TOP_EMPTY_PAGE = `${TOP_TEST_ROOT}empty_with_utils.html`;
+const SW_REGISTER_PAGE = `${SW_TEST_ROOT}empty_with_utils.html`;
+const SW_IFRAME_PAGE = `${SW_TEST_ROOT}page_post_controlled.html`;
+const SW_REL_SW_SCRIPT = "empty.js";
+
+/**
+ * Set up a ServiceWorker on a domain that will be used as 3rd party iframe.
+ * That 3rd party frame should be controlled by the ServiceWorker.
+ * After that, we open a second iframe into the first one. That should not be
+ * controlled.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["network.cookie.cookieBehavior", BEHAVIOR_REJECT_TRACKER],
+    ],
+  });
+
+  // Open the top-level page.
+  info("Opening a new tab: " + SW_REGISTER_PAGE);
+  let topTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_PAGE,
+  });
+
+  // Install SW
+  info("Registering a SW: " + SW_REL_SW_SCRIPT);
+  await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ sw: SW_REL_SW_SCRIPT }],
+    async function ({ sw }) {
+      // Waive the xray to use the content utils.js script functions.
+      await content.wrappedJSObject.registerAndWaitForActive(sw);
+      // User interaction
+      content.document.userInteractionForTesting();
+    }
+  );
+
+  info("Loading a new top-level URL: " + TOP_EMPTY_PAGE);
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    topTab.linkedBrowser
+  );
+  BrowserTestUtils.startLoadingURIString(topTab.linkedBrowser, TOP_EMPTY_PAGE);
+  await browserLoadedPromise;
+
+  // Create Iframe in the top-level page and verify its state.
+  info("Creating iframe and checking if controlled");
+  let { controlled } = await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ url: SW_IFRAME_PAGE }],
+    async function ({ url }) {
+      content.document.userInteractionForTesting();
+      const payload =
+        await content.wrappedJSObject.createIframeAndWaitForMessage(url);
+      return payload;
+    }
+  );
+
+  ok(controlled, "Should be controlled!");
+
+  // Create a nested Iframe.
+  info("Creating nested-iframe and checking if controlled");
+  let { nested_controlled } = await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ url: SW_IFRAME_PAGE }],
+    async function ({ url }) {
+      const payload =
+        await content.wrappedJSObject.createNestedIframeAndWaitForMessage(url);
+      return payload;
+    }
+  );
+
+  ok(!nested_controlled, "Should not be controlled!");
+
+  info("Loading the SW unregister page: " + SW_REGISTER_PAGE);
+  browserLoadedPromise = BrowserTestUtils.browserLoaded(topTab.linkedBrowser);
+  BrowserTestUtils.startLoadingURIString(
+    topTab.linkedBrowser,
+    SW_REGISTER_PAGE
+  );
+  await browserLoadedPromise;
+
+  await SpecialPowers.spawn(topTab.linkedBrowser, [], async function () {
+    await content.wrappedJSObject.unregisterAll();
+  });
+
+  // Close the testing tab.
+  BrowserTestUtils.removeTab(topTab);
+});
diff --git a/dom/serviceworkers/test/browser_base_force_refresh.html b/dom/serviceworkers/test/browser_base_force_refresh.html
new file mode 100644
index 0000000000..1c3d02d42f
--- /dev/null
+++ b/dom/serviceworkers/test/browser_base_force_refresh.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+<script type="text/javascript">
+addEventListener('load', function(event) {
+  navigator.serviceWorker.register('force_refresh_browser_worker.js').then(function(swr) {
+    if (!swr) {
+      return;
+    }
+    window.dispatchEvent(new Event("base-register", { bubbles: true }));
+  });
+
+  navigator.serviceWorker.ready.then(function() {
+    window.dispatchEvent(new Event("base-sw-ready", { bubbles: true }));
+  });
+
+  window.dispatchEvent(new Event("base-load", { bubbles: true }));
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/browser_cached_force_refresh.html b/dom/serviceworkers/test/browser_cached_force_refresh.html
new file mode 100644
index 0000000000..a0223d26b8
--- /dev/null
+++ b/dom/serviceworkers/test/browser_cached_force_refresh.html
@@ -0,0 +1,60 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+<script type="text/javascript">
+function ok(exp, msg) {
+  if (!exp) {
+    throw(msg);
+  }
+}
+
+function is(actual, expected, msg) {
+  if (actual !== expected) {
+    throw('got "' + actual + '", but expected "' + expected + '" - ' + msg);
+  }
+}
+
+function fail(err) {
+  window.dispatchEvent(new Event("cached-failure", { bubbles: true, detail: err }));
+}
+
+function getUncontrolledClients(sw) {
+  return new Promise(function(resolve, reject) {
+    navigator.serviceWorker.addEventListener('message', function onMsg(evt) {
+      if (evt.data.type === 'CLIENTS') {
+        navigator.serviceWorker.removeEventListener('message', onMsg);
+        resolve(evt.data.detail);
+      }
+    });
+    sw.postMessage({ type: 'GET_UNCONTROLLED_CLIENTS' })
+  });
+}
+
+addEventListener('load', function(event) {
+  if (!navigator.serviceWorker.controller) {
+    fail(window.location.href + ' is not controlled!');
+    return;
+  }
+
+  getUncontrolledClients(navigator.serviceWorker.controller)
+    .then(function(clientList) {
+      is(clientList.length, 1, 'should only have one client');
+      is(clientList[0].url, window.location.href,
+         'client url should match current window');
+      is(clientList[0].frameType, 'top-level',
+         'client should be a top-level window');
+      window.dispatchEvent(new Event('cached-load', { bubbles: true }));
+    })
+    .catch(function(err) {
+      fail(err);
+    });
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/browser_devtools_serviceworker_interception.js b/dom/serviceworkers/test/browser_devtools_serviceworker_interception.js
new file mode 100644
index 0000000000..f31c2f7dff
--- /dev/null
+++ b/dom/serviceworkers/test/browser_devtools_serviceworker_interception.js
@@ -0,0 +1,270 @@
+"use strict";
+
+const BASE_URI = "http://mochi.test:8888/browser/dom/serviceworkers/test/";
+const emptyDoc = BASE_URI + "empty.html";
+const fakeDoc = BASE_URI + "fake.html";
+const helloDoc = BASE_URI + "hello.html";
+
+const CROSS_URI = "http://example.com/browser/dom/serviceworkers/test/";
+const crossRedirect = CROSS_URI + "redirect";
+const crossHelloDoc = CROSS_URI + "hello.html";
+
+const sw = BASE_URI + "fetch.js";
+
+async function checkObserver(aInput) {
+  let interceptedChannel = null;
+
+  // We always get two channels which receive the "http-on-stop-request"
+  // notification if the service worker hijacks the request and respondWith an
+  // another fetch. One is for the "outer" window request when the other one is
+  // for the "inner" service worker request. Therefore, distinguish them by the
+  // order.
+  let waitForSecondOnStopRequest = aInput.intercepted;
+
+  let promiseResolve;
+
+  function observer(aSubject) {
+    let channel = aSubject.QueryInterface(Ci.nsIChannel);
+    // Since we cannot make sure that the network event triggered by the fetch()
+    // in this testcase is the very next event processed by ObserverService, we
+    // have to wait until we catch the one we want.
+    if (!channel.URI.spec.includes(aInput.expectedURL)) {
+      return;
+    }
+
+    if (waitForSecondOnStopRequest) {
+      waitForSecondOnStopRequest = false;
+      return;
+    }
+
+    // Wait for the service worker to intercept the request if it's expected to
+    // be intercepted
+    if (aInput.intercepted && interceptedChannel === null) {
+      return;
+    } else if (interceptedChannel) {
+      ok(
+        aInput.intercepted,
+        "Service worker intercepted the channel as expected"
+      );
+    } else {
+      ok(!aInput.intercepted, "The channel doesn't be intercepted");
+    }
+
+    var tc = interceptedChannel
+      ? interceptedChannel.QueryInterface(Ci.nsITimedChannel)
+      : aSubject.QueryInterface(Ci.nsITimedChannel);
+
+    // Check service worker related timings.
+    var serviceWorkerTimings = [
+      {
+        start: tc.launchServiceWorkerStartTime,
+        end: tc.launchServiceWorkerEndTime,
+      },
+      {
+        start: tc.dispatchFetchEventStartTime,
+        end: tc.dispatchFetchEventEndTime,
+      },
+      { start: tc.handleFetchEventStartTime, end: tc.handleFetchEventEndTime },
+    ];
+    if (!aInput.swPresent) {
+      serviceWorkerTimings.forEach(aTimings => {
+        is(aTimings.start, 0, "SW timings should be 0.");
+        is(aTimings.end, 0, "SW timings should be 0.");
+      });
+    }
+
+    // Check network related timings.
+    var networkTimings = [
+      tc.domainLookupStartTime,
+      tc.domainLookupEndTime,
+      tc.connectStartTime,
+      tc.connectEndTime,
+      tc.requestStartTime,
+      tc.responseStartTime,
+      tc.responseEndTime,
+    ];
+    if (aInput.fetch) {
+      networkTimings.reduce((aPreviousTiming, aCurrentTiming) => {
+        Assert.lessOrEqual(
+          aPreviousTiming,
+          aCurrentTiming,
+          "Checking network timings"
+        );
+        return aCurrentTiming;
+      });
+    } else {
+      networkTimings.forEach(aTiming =>
+        is(aTiming, 0, "Network timings should be 0.")
+      );
+    }
+
+    interceptedChannel = null;
+    Services.obs.removeObserver(observer, topic);
+    promiseResolve();
+  }
+
+  function addInterceptedChannel(aSubject) {
+    let channel = aSubject.QueryInterface(Ci.nsIChannel);
+    if (!channel.URI.spec.includes(aInput.url)) {
+      return;
+    }
+
+    // Hold the interceptedChannel until checking timing information.
+    // Note: It's a interceptedChannel in the type of httpChannel
+    interceptedChannel = channel;
+    Services.obs.removeObserver(addInterceptedChannel, topic_SW);
+  }
+
+  const topic = "http-on-stop-request";
+  const topic_SW = "service-worker-synthesized-response";
+
+  Services.obs.addObserver(observer, topic);
+  if (aInput.intercepted) {
+    Services.obs.addObserver(addInterceptedChannel, topic_SW);
+  }
+
+  await new Promise(resolve => {
+    promiseResolve = resolve;
+  });
+}
+
+async function contentFetch(aURL) {
+  if (aURL.includes("redirect")) {
+    await content.window.fetch(aURL, { mode: "no-cors" });
+    return;
+  }
+  await content.window.fetch(aURL);
+}
+
+// The observer topics are fired in the parent process in parent-intercept
+// and the content process in child-intercept. This function will handle running
+// the check in the correct process. Note that it will block until the observers
+// are notified.
+async function fetchAndCheckObservers(
+  aFetchBrowser,
+  aObserverBrowser,
+  aTestCase
+) {
+  let promise = null;
+
+  promise = checkObserver(aTestCase);
+
+  await SpecialPowers.spawn(aFetchBrowser, [aTestCase.url], contentFetch);
+  await promise;
+}
+
+async function registerSWAndWaitForActive(aServiceWorker) {
+  let swr = await content.navigator.serviceWorker.register(aServiceWorker, {
+    scope: "empty.html",
+  });
+  await new Promise(resolve => {
+    let worker = swr.installing || swr.waiting || swr.active;
+    if (worker.state === "activated") {
+      resolve();
+      return;
+    }
+
+    worker.addEventListener("statechange", () => {
+      if (worker.state === "activated") {
+        resolve();
+      }
+    });
+  });
+
+  await new Promise(resolve => {
+    if (content.navigator.serviceWorker.controller) {
+      resolve();
+      return;
+    }
+
+    content.navigator.serviceWorker.addEventListener(
+      "controllerchange",
+      resolve,
+      { once: true }
+    );
+  });
+}
+
+async function unregisterSW() {
+  let swr = await content.navigator.serviceWorker.getRegistration();
+  swr.unregister();
+}
+
+add_task(async function test_serivce_worker_interception() {
+  info("Setting the prefs to having e10s enabled");
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Make sure observer and testing function run in the same process
+      ["dom.ipc.processCount", 1],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  waitForExplicitFinish();
+
+  info("Open the tab");
+  let tab = BrowserTestUtils.addTab(gBrowser, emptyDoc);
+  let tabBrowser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(tabBrowser);
+
+  info("Open the tab for observing");
+  let tab_observer = BrowserTestUtils.addTab(gBrowser, emptyDoc);
+  let tabBrowser_observer = gBrowser.getBrowserForTab(tab_observer);
+  await BrowserTestUtils.browserLoaded(tabBrowser_observer);
+
+  let testcases = [
+    {
+      url: helloDoc,
+      expectedURL: helloDoc,
+      swPresent: false,
+      intercepted: false,
+      fetch: true,
+    },
+    {
+      url: fakeDoc,
+      expectedURL: helloDoc,
+      swPresent: true,
+      intercepted: true,
+      fetch: false, // should use HTTP cache
+    },
+    {
+      // Bypass http cache
+      url: helloDoc + "?ForBypassingHttpCache=" + Date.now(),
+      expectedURL: helloDoc,
+      swPresent: true,
+      intercepted: false,
+      fetch: true,
+    },
+    {
+      // no-cors mode redirect to no-cors mode (trigger internal redirect)
+      url: crossRedirect + "?url=" + crossHelloDoc + "&mode=no-cors",
+      expectedURL: crossHelloDoc,
+      swPresent: true,
+      redirect: "hello.html",
+      intercepted: true,
+      fetch: true,
+    },
+  ];
+
+  info("Test 1: Verify simple fetch");
+  await fetchAndCheckObservers(tabBrowser, tabBrowser_observer, testcases[0]);
+
+  info("Register a service worker");
+  await SpecialPowers.spawn(tabBrowser, [sw], registerSWAndWaitForActive);
+
+  info("Test 2: Verify simple hijack");
+  await fetchAndCheckObservers(tabBrowser, tabBrowser_observer, testcases[1]);
+
+  info("Test 3: Verify fetch without using http cache");
+  await fetchAndCheckObservers(tabBrowser, tabBrowser_observer, testcases[2]);
+
+  info("Test 4: make a internal redirect");
+  await fetchAndCheckObservers(tabBrowser, tabBrowser_observer, testcases[3]);
+
+  info("Clean up");
+  await SpecialPowers.spawn(tabBrowser, [undefined], unregisterSW);
+
+  gBrowser.removeTab(tab);
+  gBrowser.removeTab(tab_observer);
+});
diff --git a/dom/serviceworkers/test/browser_download.js b/dom/serviceworkers/test/browser_download.js
new file mode 100644
index 0000000000..0c69a48d17
--- /dev/null
+++ b/dom/serviceworkers/test/browser_download.js
@@ -0,0 +1,93 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var gTestRoot = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://mochi.test:8888/"
+);
+
+function getFile(aFilename) {
+  if (aFilename.startsWith("file:")) {
+    var url = NetUtil.newURI(aFilename).QueryInterface(Ci.nsIFileURL);
+    return url.file.clone();
+  }
+
+  var file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
+  file.initWithPath(aFilename);
+  return file;
+}
+
+function windowObserver(win, topic) {
+  if (topic !== "domwindowopened") {
+    return;
+  }
+
+  win.addEventListener(
+    "load",
+    function () {
+      if (
+        win.document.documentURI ===
+        "chrome://mozapps/content/downloads/unknownContentType.xhtml"
+      ) {
+        executeSoon(function () {
+          let dialog = win.document.getElementById("unknownContentType");
+          let button = dialog.getButton("accept");
+          button.disabled = false;
+          dialog.acceptDialog();
+        });
+      }
+    },
+    { once: true }
+  );
+}
+
+function test() {
+  waitForExplicitFinish();
+
+  Services.ww.registerNotification(windowObserver);
+
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+        ["dom.serviceWorkers.testing.enabled", true],
+      ],
+    },
+    function () {
+      var url = gTestRoot + "download/window.html";
+      var tab = BrowserTestUtils.addTab(gBrowser);
+      gBrowser.selectedTab = tab;
+
+      Downloads.getList(Downloads.ALL)
+        .then(function (downloadList) {
+          var downloadListener;
+
+          function downloadVerifier(aDownload) {
+            if (aDownload.succeeded) {
+              var file = getFile(aDownload.target.path);
+              ok(file.exists(), "download completed");
+              is(file.fileSize, 33, "downloaded file has correct size");
+              file.remove(false);
+              downloadList.remove(aDownload).catch(console.error);
+              downloadList.removeView(downloadListener).catch(console.error);
+              gBrowser.removeTab(tab);
+              Services.ww.unregisterNotification(windowObserver);
+
+              executeSoon(finish);
+            }
+          }
+
+          downloadListener = {
+            onDownloadAdded: downloadVerifier,
+            onDownloadChanged: downloadVerifier,
+          };
+
+          return downloadList.addView(downloadListener);
+        })
+        .then(function () {
+          BrowserTestUtils.startLoadingURIString(gBrowser, url);
+        });
+    }
+  );
+}
diff --git a/dom/serviceworkers/test/browser_download_canceled.js b/dom/serviceworkers/test/browser_download_canceled.js
new file mode 100644
index 0000000000..2deb8389ef
--- /dev/null
+++ b/dom/serviceworkers/test/browser_download_canceled.js
@@ -0,0 +1,174 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Test cancellation of a download in order to test edge-cases related to
+ * channel diversion.  Channel diversion occurs in cases of file (and PSM cert)
+ * downloads where we realize in the child that we really want to consume the
+ * channel data in the parent.  For data "sourced" by the parent, like network
+ * data, data streaming to the child is suspended and the parent waits for the
+ * child to send back the data it already received, then the channel is resumed.
+ * For data generated by the child, such as (the current, to be mooted by
+ * parent-intercept) child-side intercept, the data (currently) stream is
+ * continually pumped up to the parent.
+ *
+ * In particular, we want to reproduce the circumstances of Bug 1418795 where
+ * the child-side input-stream pump attempts to send data to the parent process
+ * but the parent has canceled the channel and so the IPC Actor has been torn
+ * down.  Diversion begins once the nsURILoader receives the OnStartRequest
+ * notification with the headers, so there are two ways to produce
+ */
+
+/**
+ * Clear the downloads list so other tests don't see our byproducts.
+ */
+async function clearDownloads() {
+  const downloads = await Downloads.getList(Downloads.ALL);
+  downloads.removeFinished();
+}
+
+/**
+ * Returns a Promise that will be resolved once the download dialog shows up and
+ * we have clicked the given button.
+ */
+function promiseClickDownloadDialogButton(buttonAction) {
+  const uri = "chrome://mozapps/content/downloads/unknownContentType.xhtml";
+  return BrowserTestUtils.promiseAlertDialogOpen(buttonAction, uri, {
+    async callback(win) {
+      // nsHelperAppDlg.js currently uses an eval-based setTimeout(0) to invoke
+      // its postShowCallback that results in a misleading error to the console
+      // if we close the dialog before it gets a chance to run.  Just a
+      // setTimeout is not sufficient because it appears we get our "load"
+      // listener before the document's, so we use TestUtils.waitForTick() to
+      // defer until after its load handler runs, then use setTimeout(0) to end
+      // up after its eval.
+      await TestUtils.waitForTick();
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+
+      const button = win.document
+        .getElementById("unknownContentType")
+        .getButton(buttonAction);
+      button.disabled = false;
+      info(`clicking ${buttonAction} button`);
+      button.click();
+    },
+  });
+}
+
+async function performCanceledDownload(tab, path) {
+  // If we're going to show a modal dialog for this download, then we should
+  // use it to cancel the download. If not, then we have to let the download
+  // start and then call into the downloads API ourselves to cancel it.
+  // We use this promise to signal the cancel being complete in either case.
+  let cancelledDownload;
+
+  if (
+    Services.prefs.getBoolPref(
+      "browser.download.always_ask_before_handling_new_types",
+      false
+    )
+  ) {
+    // Start waiting for the download dialog before triggering the download.
+    cancelledDownload = promiseClickDownloadDialogButton("cancel");
+    // Wait for the cancelation to have been triggered.
+    info("waiting for download popup");
+  } else {
+    let downloadView;
+    cancelledDownload = new Promise(resolve => {
+      downloadView = {
+        onDownloadAdded(aDownload) {
+          aDownload.cancel();
+          resolve();
+        },
+      };
+    });
+    const downloadList = await Downloads.getList(Downloads.ALL);
+    await downloadList.addView(downloadView);
+  }
+
+  // Trigger the download.
+  info(`triggering download of "${path}"`);
+  /* eslint-disable no-shadow */
+  await SpecialPowers.spawn(tab.linkedBrowser, [path], function (path) {
+    // Put a Promise in place that we can wait on for stream closure.
+    content.wrappedJSObject.trackStreamClosure(path);
+    // Create the link and trigger the download.
+    const link = content.document.createElement("a");
+    link.href = path;
+    link.download = path;
+    content.document.body.appendChild(link);
+    link.click();
+  });
+  /* eslint-enable no-shadow */
+
+  // Wait for the download to cancel.
+  await cancelledDownload;
+  info("cancelled download");
+
+  // Wait for confirmation that the stream stopped.
+  info(`wait for the ${path} stream to close.`);
+  /* eslint-disable no-shadow */
+  const why = await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [path],
+    function (path) {
+      return content.wrappedJSObject.streamClosed[path].promise;
+    }
+  );
+  /* eslint-enable no-shadow */
+  is(why.why, "canceled", "Ensure the stream canceled instead of timing out.");
+  // Note that for the "sw-stream-download" case, we end up with a bogus
+  // reason of "'close' may only be called on a stream in the 'readable' state."
+  // Since we aren't actually invoking close(), I'm assuming this is an
+  // implementation bug that will be corrected in the web platform tests.
+  info(`Cancellation reason: ${why.message} after ${why.ticks} ticks`);
+}
+
+const gTestRoot = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://mochi.test:8888/"
+);
+
+const PAGE_URL = `${gTestRoot}download_canceled/page_download_canceled.html`;
+
+add_task(async function interruptedDownloads() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  // Open the tab
+  const tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: PAGE_URL,
+  });
+
+  // Wait for it to become controlled.  Check that it was a promise that
+  // resolved as expected rather than undefined by checking the return value.
+  const controlled = await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [],
+    function () {
+      // This is a promise set up by the page during load, and we are post-load.
+      return content.wrappedJSObject.controlled;
+    }
+  );
+  is(controlled, "controlled", "page became controlled");
+
+  // Download a pass-through fetch stream.
+  await performCanceledDownload(tab, "sw-passthrough-download");
+
+  // Download a SW-generated stream
+  await performCanceledDownload(tab, "sw-stream-download");
+
+  // Cleanup
+  await SpecialPowers.spawn(tab.linkedBrowser, [], function () {
+    return content.wrappedJSObject.registration.unregister();
+  });
+  BrowserTestUtils.removeTab(tab);
+  await clearDownloads();
+});
diff --git a/dom/serviceworkers/test/browser_force_refresh.js b/dom/serviceworkers/test/browser_force_refresh.js
new file mode 100644
index 0000000000..1f6b1b9d9f
--- /dev/null
+++ b/dom/serviceworkers/test/browser_force_refresh.js
@@ -0,0 +1,86 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var gTestRoot = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://mochi.test:8888/"
+);
+
+async function refresh() {
+  EventUtils.synthesizeKey("R", { accelKey: true });
+}
+
+async function forceRefresh() {
+  EventUtils.synthesizeKey("R", { accelKey: true, shiftKey: true });
+}
+
+async function done() {
+  // unregister window actors
+  ChromeUtils.unregisterWindowActor("ForceRefresh");
+  let tab = gBrowser.selectedTab;
+  let tabBrowser = gBrowser.getBrowserForTab(tab);
+  await ContentTask.spawn(tabBrowser, null, async function () {
+    const swr = await content.navigator.serviceWorker.getRegistration();
+    await swr.unregister();
+  });
+
+  BrowserTestUtils.removeTab(tab);
+  executeSoon(finish);
+}
+
+function test() {
+  waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+        ["dom.serviceWorkers.testing.enabled", true],
+        ["browser.cache.disk.enable", false],
+        ["browser.cache.memory.enable", false],
+      ],
+    },
+    async function () {
+      // create ForceRefreseh window actor
+      const { ForceRefreshParent } = ChromeUtils.importESModule(
+        getRootDirectory(gTestPath) + "ForceRefreshParent.sys.mjs"
+      );
+
+      // setup helper functions for ForceRefreshParent
+      ForceRefreshParent.SimpleTest = SimpleTest;
+      ForceRefreshParent.refresh = refresh;
+      ForceRefreshParent.forceRefresh = forceRefresh;
+      ForceRefreshParent.done = done;
+
+      // setup window actor options
+      let windowActorOptions = {
+        parent: {
+          esModuleURI:
+            getRootDirectory(gTestPath) + "ForceRefreshParent.sys.mjs",
+        },
+        child: {
+          esModuleURI:
+            getRootDirectory(gTestPath) + "ForceRefreshChild.sys.mjs",
+          events: {
+            "base-register": { capture: true, wantUntrusted: true },
+            "base-sw-ready": { capture: true, wantUntrusted: true },
+            "base-load": { capture: true, wantUntrusted: true },
+            "cached-load": { capture: true, wantUntrusted: true },
+            "cached-failure": { capture: true, wantUntrusted: true },
+          },
+        },
+        allFrames: true,
+      };
+
+      // register ForceRefresh window actors
+      ChromeUtils.registerWindowActor("ForceRefresh", windowActorOptions);
+
+      // create a new tab and load test url
+      var url = gTestRoot + "browser_base_force_refresh.html";
+      var tab = BrowserTestUtils.addTab(gBrowser);
+      var tabBrowser = gBrowser.getBrowserForTab(tab);
+      gBrowser.selectedTab = tab;
+      BrowserTestUtils.startLoadingURIString(gBrowser, url);
+    }
+  );
+}
diff --git a/dom/serviceworkers/test/browser_head.js b/dom/serviceworkers/test/browser_head.js
new file mode 100644
index 0000000000..78e4d327ec
--- /dev/null
+++ b/dom/serviceworkers/test/browser_head.js
@@ -0,0 +1,318 @@
+/**
+ * This file contains common functionality for ServiceWorker browser tests.
+ *
+ * Note that the normal auto-import mechanics for browser mochitests only
+ * handles "head.js", but we currently store all of our different varieties of
+ * mochitest in a single directory, which potentially results in a collision
+ * for similar heuristics for xpcshell.
+ *
+ * Many of the storage-related helpers in this file come from:
+ * https://searchfox.org/mozilla-central/source/dom/localstorage/test/unit/head.js
+ **/
+
+// To use this file, explicitly import it via:
+//
+// Services.scriptloader.loadSubScript("chrome://mochitests/content/browser/dom/serviceworkers/test/browser_head.js", this);
+
+// Find the current parent directory of the test context we're being loaded into
+// such that one can do `${originNoTrailingSlash}/${DIR_PATH}/file_in_dir.foo`.
+const DIR_PATH = getRootDirectory(gTestPath)
+  .replace("chrome://mochitests/content/", "")
+  .slice(0, -1);
+
+const SWM = Cc["@mozilla.org/serviceworkers/manager;1"].getService(
+  Ci.nsIServiceWorkerManager
+);
+
+// The expected minimum usage for an origin that has any Cache API storage in
+// use. Currently, the DB uses a page size of 4k and a minimum growth size of
+// 32k and has enough tables/indices for this to round up to 64k.
+const kMinimumOriginUsageBytes = 65536;
+
+function getPrincipal(url, attrs) {
+  const uri = Services.io.newURI(url);
+  if (!attrs) {
+    attrs = {};
+  }
+  return Services.scriptSecurityManager.createContentPrincipal(uri, attrs);
+}
+
+async function _qm_requestFinished(request) {
+  await new Promise(function (resolve) {
+    request.callback = function () {
+      resolve();
+    };
+  });
+
+  if (request.resultCode !== Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
+
+async function qm_reset_storage() {
+  return new Promise(resolve => {
+    let request = Services.qms.reset();
+    request.callback = resolve;
+  });
+}
+
+async function get_qm_origin_usage(origin) {
+  return new Promise(resolve => {
+    const principal =
+      Services.scriptSecurityManager.createContentPrincipalFromOrigin(origin);
+    Services.qms.getUsageForPrincipal(principal, request =>
+      resolve(request.result.usage)
+    );
+  });
+}
+
+/**
+ * Clear the group associated with the given origin via nsIClearDataService.  We
+ * are using nsIClearDataService here because nsIQuotaManagerService doesn't
+ * (directly) provide a means of clearing a group.
+ */
+async function clear_qm_origin_group_via_clearData(origin) {
+  const uri = Services.io.newURI(origin);
+  const baseDomain = Services.eTLD.getBaseDomain(uri);
+  info(`Clearing storage on domain ${baseDomain} (from origin ${origin})`);
+
+  // Initiate group clearing and wait for it.
+  await new Promise((resolve, reject) => {
+    Services.clearData.deleteDataFromBaseDomain(
+      baseDomain,
+      false,
+      Services.clearData.CLEAR_DOM_QUOTA,
+      failedFlags => {
+        if (failedFlags) {
+          reject(failedFlags);
+        } else {
+          resolve();
+        }
+      }
+    );
+  });
+}
+
+/**
+ * Look up the nsIServiceWorkerRegistrationInfo for a given SW descriptor.
+ */
+function swm_lookup_reg(swDesc) {
+  // Scopes always include the full origin.
+  const fullScope = `${swDesc.origin}/${DIR_PATH}/${swDesc.scope}`;
+  const principal = getPrincipal(fullScope);
+
+  const reg = SWM.getRegistrationByPrincipal(principal, fullScope);
+
+  return reg;
+}
+
+/**
+ * Install a ServiceWorker according to the provided descriptor by opening a
+ * fresh tab that will be closed when we are done.  Returns the
+ * `nsIServiceWorkerRegistrationInfo` corresponding to the registration.
+ *
+ * The descriptor may have the following properties:
+ * - scope: Optional.
+ * - script: The script, which usually just wants to be a relative path.
+ * - origin: Requred, the origin (which should not include a trailing slash).
+ */
+async function install_sw(swDesc) {
+  info(
+    `Installing ServiceWorker ${swDesc.script} at ${swDesc.scope} on origin ${swDesc.origin}`
+  );
+  const pageUrlStr = `${swDesc.origin}/${DIR_PATH}/empty_with_utils.html`;
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: pageUrlStr,
+    },
+    async browser => {
+      await SpecialPowers.spawn(
+        browser,
+        [{ swScript: swDesc.script, swScope: swDesc.scope }],
+        async function ({ swScript, swScope }) {
+          await content.wrappedJSObject.registerAndWaitForActive(
+            swScript,
+            swScope
+          );
+        }
+      );
+    }
+  );
+  info(`ServiceWorker installed`);
+
+  return swm_lookup_reg(swDesc);
+}
+
+/**
+ * Consume storage in the given origin by storing randomly generated Blobs into
+ * Cache API storage and IndexedDB storage.  We use both APIs in order to
+ * ensure that data clearing wipes both QM clients.
+ *
+ * Randomly generated Blobs means Blobs with literally random content.  This is
+ * done to compensate for the Cache API using snappy for compression.
+ */
+async function consume_storage(origin, storageDesc) {
+  info(`Consuming storage on origin ${origin}`);
+  const pageUrlStr = `${origin}/${DIR_PATH}/empty_with_utils.html`;
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: pageUrlStr,
+    },
+    async browser => {
+      await SpecialPowers.spawn(
+        browser,
+        [storageDesc],
+        async function ({ cacheBytes, idbBytes }) {
+          await content.wrappedJSObject.fillStorage(cacheBytes, idbBytes);
+        }
+      );
+    }
+  );
+}
+
+// Check if the origin is effectively empty, but allowing for the minimum size
+// Cache API database to be present.
+function is_minimum_origin_usage(originUsageBytes) {
+  return originUsageBytes <= kMinimumOriginUsageBytes;
+}
+
+/**
+ * Perform a navigation, waiting until the navigation stops, then returning
+ * the `textContent` of the body node.  The expectation is this will be used
+ * with ServiceWorkers that return a body that indicates the ServiceWorker
+ * provided the result (possibly derived from the request) versus if
+ * interception didn't happen.
+ */
+async function navigate_and_get_body(swDesc, debugTag) {
+  let pageUrlStr = `${swDesc.origin}/${DIR_PATH}/${swDesc.scope}`;
+  if (debugTag) {
+    pageUrlStr += "?" + debugTag;
+  }
+  info(`Navigating to ${pageUrlStr}`);
+
+  const tabResult = await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: pageUrlStr,
+      // In the event of an aborted navigation, the load event will never
+      // happen...
+      waitForLoad: false,
+      // ...but the stop will.
+      waitForStateStop: true,
+    },
+    async browser => {
+      info(` Tab opened, querying body content.`);
+      const spawnResult = await SpecialPowers.spawn(browser, [], function () {
+        const controlled = !!content.navigator.serviceWorker.controller;
+        // Special-case about: URL's.
+        let loc = content.document.documentURI;
+        if (loc.startsWith("about:")) {
+          // about:neterror is parameterized by query string, so truncate that
+          // off because our tests just care if we're seeing the neterror page.
+          const idxQuestion = loc.indexOf("?");
+          if (idxQuestion !== -1) {
+            loc = loc.substring(0, idxQuestion);
+          }
+          return { controlled, body: loc };
+        }
+        return {
+          controlled,
+          body: content.document?.body?.textContent?.trim(),
+        };
+      });
+
+      return spawnResult;
+    }
+  );
+
+  return tabResult;
+}
+
+function waitForIframeLoad(iframe) {
+  return new Promise(function (resolve) {
+    iframe.onload = resolve;
+  });
+}
+
+function waitForRegister(scope, callback) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onRegister(registration) {
+        if (registration.scope !== scope) {
+          return;
+        }
+        SWM.removeListener(listener);
+        resolve(callback ? callback(registration) : registration);
+      },
+    };
+    SWM.addListener(listener);
+  });
+}
+
+function waitForUnregister(scope) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onUnregister(registration) {
+        if (registration.scope !== scope) {
+          return;
+        }
+        SWM.removeListener(listener);
+        resolve(registration);
+      },
+    };
+    SWM.addListener(listener);
+  });
+}
+
+// Be careful using this helper function, please make sure QuotaUsageCheck must
+// happen, otherwise test would be stucked in this function.
+function waitForQuotaUsageCheckFinish(scope) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onQuotaUsageCheckFinish(registration) {
+        if (registration.scope !== scope) {
+          return;
+        }
+        SWM.removeListener(listener);
+        resolve(registration);
+      },
+    };
+    SWM.addListener(listener);
+  });
+}
+
+function waitForServiceWorkerRegistrationChange(registration, callback) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onChange() {
+        registration.removeListener(listener);
+        if (callback) {
+          callback();
+        }
+        resolve(callback ? callback() : undefined);
+      },
+    };
+    registration.addListener(listener);
+  });
+}
+
+function waitForServiceWorkerShutdown() {
+  return new Promise(function (resolve) {
+    let observer = {
+      observe(subject, topic, data) {
+        if (topic !== "service-worker-shutdown") {
+          return;
+        }
+        SpecialPowers.removeObserver(observer, "service-worker-shutdown");
+        resolve();
+      },
+    };
+    SpecialPowers.addObserver(observer, "service-worker-shutdown");
+  });
+}
diff --git a/dom/serviceworkers/test/browser_intercepted_channel_process_swap.js b/dom/serviceworkers/test/browser_intercepted_channel_process_swap.js
new file mode 100644
index 0000000000..2aa5618a20
--- /dev/null
+++ b/dom/serviceworkers/test/browser_intercepted_channel_process_swap.js
@@ -0,0 +1,110 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that navigation loads through intercepted channels result in the
+// appropriate process swaps. This appears to only be possible when navigating
+// to a cross-origin URL, where that navigation is controlled by a ServiceWorker.
+
+"use strict";
+
+const SAME_ORIGIN = "https://example.com";
+const CROSS_ORIGIN = "https://example.org";
+
+const SAME_ORIGIN_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  SAME_ORIGIN
+);
+const CROSS_ORIGIN_ROOT = SAME_ORIGIN_ROOT.replace(SAME_ORIGIN, CROSS_ORIGIN);
+
+const SW_REGISTER_URL = `${CROSS_ORIGIN_ROOT}empty_with_utils.html`;
+const SW_SCRIPT_URL = `${CROSS_ORIGIN_ROOT}intercepted_channel_process_swap_worker.js`;
+const URL_BEFORE_NAVIGATION = `${SAME_ORIGIN_ROOT}empty.html`;
+const CROSS_ORIGIN_URL = `${CROSS_ORIGIN_ROOT}empty.html`;
+
+const TESTCASES = [
+  {
+    url: CROSS_ORIGIN_URL,
+    description:
+      "Controlled cross-origin navigation with network-provided response",
+  },
+  {
+    url: `${CROSS_ORIGIN_ROOT}this-path-does-not-exist?respondWith=${CROSS_ORIGIN_URL}`,
+    description:
+      "Controlled cross-origin navigation with ServiceWorker-provided response",
+  },
+];
+
+async function navigateTab(aTab, aUrl) {
+  BrowserTestUtils.startLoadingURIString(aTab.linkedBrowser, aUrl);
+
+  await BrowserTestUtils.waitForLocationChange(gBrowser, aUrl).then(() =>
+    BrowserTestUtils.browserStopped(aTab.linkedBrowser)
+  );
+}
+
+async function runTestcase(aTab, aTestcase) {
+  info(`Testing ${aTestcase.description}`);
+
+  await navigateTab(aTab, URL_BEFORE_NAVIGATION);
+
+  const [initialPid] = E10SUtils.getBrowserPids(aTab.linkedBrowser);
+
+  await navigateTab(aTab, aTestcase.url);
+
+  const [finalPid] = E10SUtils.getBrowserPids(aTab.linkedBrowser);
+
+  await SpecialPowers.spawn(aTab.linkedBrowser, [], () => {
+    Assert.ok(
+      content.navigator.serviceWorker.controller,
+      `${content.location} should be controlled.`
+    );
+  });
+
+  Assert.notEqual(
+    initialPid,
+    finalPid,
+    `Navigating from ${URL_BEFORE_NAVIGATION} to ${aTab.linkedBrowser.currentURI.spec} should have resulted in a different PID.`
+  );
+}
+
+add_task(async function setupPrefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+});
+
+add_task(async function setupBrowser() {
+  const tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_URL,
+  });
+
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [SW_SCRIPT_URL],
+    async scriptUrl => {
+      await content.wrappedJSObject.registerAndWaitForActive(scriptUrl);
+    }
+  );
+});
+
+add_task(async function runTestcases() {
+  for (const testcase of TESTCASES) {
+    await runTestcase(gBrowser.selectedTab, testcase);
+  }
+});
+
+add_task(async function cleanup() {
+  const tab = gBrowser.selectedTab;
+
+  await navigateTab(tab, SW_REGISTER_URL);
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+    await content.wrappedJSObject.unregisterAll();
+  });
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/dom/serviceworkers/test/browser_intercepted_worker_script.js b/dom/serviceworkers/test/browser_intercepted_worker_script.js
new file mode 100644
index 0000000000..123110952d
--- /dev/null
+++ b/dom/serviceworkers/test/browser_intercepted_worker_script.js
@@ -0,0 +1,102 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * This test tests if the service worker is able to intercept the script loading
+ * channel of a dedicated worker.
+ *
+ * On success, the test will not crash.
+ */
+
+const SAME_ORIGIN = "https://example.com";
+
+const SAME_ORIGIN_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  SAME_ORIGIN
+);
+
+const SW_REGISTER_URL = `${SAME_ORIGIN_ROOT}empty_with_utils.html`;
+const SW_SCRIPT_URL = `${SAME_ORIGIN_ROOT}simple_fetch_worker.js`;
+const SCRIPT_URL = `${SAME_ORIGIN_ROOT}empty.js`;
+
+async function navigateTab(aTab, aUrl) {
+  BrowserTestUtils.startLoadingURIString(aTab.linkedBrowser, aUrl);
+
+  await BrowserTestUtils.waitForLocationChange(gBrowser, aUrl).then(() =>
+    BrowserTestUtils.browserStopped(aTab.linkedBrowser)
+  );
+}
+
+async function runTest(aTestSharedWorker) {
+  const tab = gBrowser.selectedTab;
+
+  await navigateTab(tab, SW_REGISTER_URL);
+
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [SCRIPT_URL, aTestSharedWorker],
+    async (scriptUrl, testSharedWorker) => {
+      await new Promise(resolve => {
+        content.navigator.serviceWorker.onmessage = e => {
+          if (e.data == scriptUrl) {
+            resolve();
+          }
+        };
+
+        if (testSharedWorker) {
+          let worker = new content.Worker(scriptUrl);
+        } else {
+          let worker = new content.SharedWorker(scriptUrl);
+        }
+      });
+    }
+  );
+
+  ok(true, "The service worker has intercepted the script loading.");
+}
+
+add_task(async function setupPrefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      [
+        "network.cookie.cookieBehavior",
+        Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+      ],
+    ],
+  });
+});
+
+add_task(async function setupBrowser() {
+  // The tab will be used by subsequent test steps via 'gBrowser.selectedTab'.
+  const tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_URL,
+  });
+
+  registerCleanupFunction(async _ => {
+    await navigateTab(tab, SW_REGISTER_URL);
+
+    await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+      await content.wrappedJSObject.unregisterAll();
+    });
+
+    BrowserTestUtils.removeTab(tab);
+  });
+
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [SW_SCRIPT_URL],
+    async scriptUrl => {
+      await content.wrappedJSObject.registerAndWaitForActive(scriptUrl);
+    }
+  );
+});
+
+add_task(async function runTests() {
+  await runTest(false);
+  await runTest(true);
+});
diff --git a/dom/serviceworkers/test/browser_navigationPreload_read_after_respondWith.js b/dom/serviceworkers/test/browser_navigationPreload_read_after_respondWith.js
new file mode 100644
index 0000000000..d321fd8b54
--- /dev/null
+++ b/dom/serviceworkers/test/browser_navigationPreload_read_after_respondWith.js
@@ -0,0 +1,121 @@
+const TOP_DOMAIN = "http://mochi.test:8888/";
+const SW_DOMAIN = "https://example.org/";
+
+const TOP_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  TOP_DOMAIN
+);
+const SW_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  SW_DOMAIN
+);
+
+const TOP_EMPTY_PAGE = `${TOP_TEST_ROOT}empty_with_utils.html`;
+const SW_REGISTER_PAGE = `${SW_TEST_ROOT}empty_with_utils.html`;
+const SW_IFRAME_PAGE = `${SW_TEST_ROOT}navigationPreload_page.html`;
+// An empty script suffices for our SW needs; it's by definition no-fetch.
+const SW_REL_SW_SCRIPT = "sw_with_navigationPreload.js";
+
+/**
+ * Test the FetchEvent.preloadResponse can be read after FetchEvent.respondWith()
+ *
+ * Step 1. register a ServiceWorker which only handles FetchEvent when request
+ *         url includes navigationPreload_page.html. Otherwise, it alwasy
+ *         fallbacks the fetch to the network.
+ *         If the request url includes navigationPreload_page.html, it call
+ *         FetchEvent.respondWith() with a new Resposne, and then call
+ *         FetchEvent.waitUtil() to wait FetchEvent.preloadResponse and post the
+ *         preloadResponse's text to clients.
+ * Step 2. Open a controlled page and register message event handler to receive
+ *         the postMessage from ServiceWorker.
+ * Step 3. Create a iframe which url is navigationPreload_page.html, such that
+ *         ServiceWorker can fake the response and then send preloadResponse's
+ *         result.
+ * Step 4. Unregister the ServiceWorker and cleanup the environment.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  // Step 1.
+  info("Opening a new tab: " + SW_REGISTER_PAGE);
+  let topTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_PAGE,
+  });
+
+  // ## Install SW
+  await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ sw: SW_REL_SW_SCRIPT }],
+    async function ({ sw }) {
+      // Waive the xray to use the content utils.js script functions.
+      dump(`register serviceworker...\n`);
+      await content.wrappedJSObject.registerAndWaitForActive(sw);
+    }
+  );
+
+  // Step 2.
+  info("Loading a controlled page: " + SW_REGISTER_PAGE);
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    topTab.linkedBrowser
+  );
+  BrowserTestUtils.startLoadingURIString(
+    topTab.linkedBrowser,
+    SW_REGISTER_PAGE
+  );
+  await browserLoadedPromise;
+
+  info("Create a target iframe: " + SW_IFRAME_PAGE);
+  let result = await SpecialPowers.spawn(
+    topTab.linkedBrowser,
+    [{ url: SW_IFRAME_PAGE }],
+    async function ({ url }) {
+      async function waitForNavigationPreload() {
+        return new Promise(resolve => {
+          content.wrappedJSObject.navigator.serviceWorker.addEventListener(
+            `message`,
+            event => {
+              resolve(event.data);
+            }
+          );
+        });
+      }
+
+      let promise = waitForNavigationPreload();
+
+      // Step 3.
+      const iframe = content.wrappedJSObject.document.createElement("iframe");
+      iframe.src = url;
+      content.wrappedJSObject.document.body.appendChild(iframe);
+      await new Promise(r => {
+        iframe.onload = r;
+      });
+
+      let result = await promise;
+      return result;
+    }
+  );
+
+  is(result, "NavigationPreload\n", "Should get NavigationPreload result");
+
+  // Step 4.
+  info("Loading the SW unregister page: " + SW_REGISTER_PAGE);
+  browserLoadedPromise = BrowserTestUtils.browserLoaded(topTab.linkedBrowser);
+  BrowserTestUtils.startLoadingURIString(
+    topTab.linkedBrowser,
+    SW_REGISTER_PAGE
+  );
+  await browserLoadedPromise;
+
+  await SpecialPowers.spawn(topTab.linkedBrowser, [], async function () {
+    await content.wrappedJSObject.unregisterAll();
+  });
+
+  // Close the testing tab.
+  BrowserTestUtils.removeTab(topTab);
+});
diff --git a/dom/serviceworkers/test/browser_navigation_fetch_fault_handling.js b/dom/serviceworkers/test/browser_navigation_fetch_fault_handling.js
new file mode 100644
index 0000000000..a72fc68b69
--- /dev/null
+++ b/dom/serviceworkers/test/browser_navigation_fetch_fault_handling.js
@@ -0,0 +1,276 @@
+/**
+ * This test file tests our automatic recovery and any related mitigating
+ * heuristics that occur during intercepted navigation fetch request.
+ * Specifically, we should be resetting interception so that we go to the
+ * network in these cases and then potentially taking actions like unregistering
+ * the ServiceWorker and/or clearing QuotaManager-managed storage for the
+ * origin.
+ *
+ * See specific test permutations for specific details inline in the test.
+ *
+ * NOTE THAT CURRENTLY THIS TEST IS DISCUSSING MITIGATIONS THAT ARE NOT YET
+ * IMPLEMENTED, JUST PLANNED.  These will be iterated on and added to the rest
+ * of the stack of patches on Bug 1503072.
+ *
+ * ## Test Mechanics
+ *
+ * ### Fetch Fault Injection
+ *
+ * We expose:
+ * - On nsIServiceWorkerInfo, the per-ServiceWorker XPCOM interface:
+ *   - A mechanism for creating synthetic faults by setting the
+ *     `nsIServiceWorkerInfo::testingInjectCancellation` attribute to a failing
+ *     nsresult.  The fault is applied at the beginning of the steps to dispatch
+ *     the fetch event on the global.
+ *   - A count of the number of times we experienced these navigation faults
+ *     that had to be reset as `nsIServiceWorkerInfo::navigationFaultCount`.
+ *     (This would also include real faults, but we only expect to see synthetic
+ *     faults in this test.)
+ * - On nsIServiceWorkerRegistrationInfo, the per-registration XPCOM interface:
+ *   - A readonly attribute that indicates how many times an origin storage
+ *     usage check has been initiated.
+ *
+ * We also use:
+ * - `nsIServiceWorkerManager::addListener(nsIServiceWorkerManagerListener)`
+ *   allows our test to listen for the unregistration of registrations.  This
+ *   allows us to be notified when unregistering or origin-clearing actions have
+ *   been taken as a mitigation.
+ *
+ * ### General Test Approach
+ *
+ * For each test we:
+ * - Ensure/confirm the testing origin has no QuotaManager storage in use.
+ * - Install the ServiceWorker.
+ * - If we are testing the situation where we want to simulate the origin being
+ *   near its quota limit, we also generate Cache API and IDB storage usage
+ *   sufficient to put our origin over the threshold.
+ *   - We run a quota check on the origin after doing this in order to make sure
+ *     that we did this correctly and that we properly constrained the limit for
+ *     the origin.  We fail the test for test implementation reasons if we
+ *     didn't accomplish this.
+ * - Verify a fetch navigation to the SW works without any fault injection,
+ *   producing a result produced by the ServiceWorker.
+ * - Begin fault permutations in a loop, where for each pass of the loop:
+ *   - We trigger a navigation which will result in an intercepted fetch
+ *     which will fault.  We wait until the navigation completes.
+ *   - We verify that we got the request from the network.
+ *   - We verify that the ServiceWorker's navigationFaultCount increased.
+ *   - If this the count at which we expect a mitigation to take place, we wait
+ *     for the registration to become unregistered AND:
+ *     - We check whether the storage for the origin was cleared or not, which
+ *       indicates which mitigation of the following happened:
+ *       - Unregister the registration directly.
+ *       - Clear the origin's data which will also unregister the registration
+ *         as a side effect.
+ *     - We check whether the registration indicates an origin quota check
+ *       happened or not.
+ *
+ * ### Disk Usage Limits
+ *
+ * In order to avoid gratuitous disk I/O and related overheads, we limit QM
+ * ("temporary") storage to 10 MiB which ends up limiting group usage to 10 MiB.
+ * This lets us set a threshold situation where we claim that a SW needs at
+ * least 4 MiB of storage for installation/operation, meaning that any usage
+ * beyond 6 MiB in the group will constitute a need to clear the group or
+ * origin.  We fill with the storage with 8 MiB of artificial usage to this end,
+ * storing 4 MiB in Cache API and 4 MiB in IDB.
+ **/
+
+// Because of the amount of I/O involved in this test, pernosco reproductions
+// may experience timeouts without a timeout multiplier.
+requestLongerTimeout(2);
+
+/* import-globals-from browser_head.js */
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/dom/serviceworkers/test/browser_head.js",
+  this
+);
+
+// The origin we run the tests on.
+const TEST_ORIGIN = "https://test1.example.org";
+// An origin in the same group that impacts the usage of the TEST_ORIGIN.  Used
+// to verify heuristics related to group-clearing (where clearing the
+// TEST_ORIGIN itself would not be sufficient for us to mitigate quota limits
+// being reached.)
+const SAME_GROUP_ORIGIN = "https://test2.example.org";
+
+const TEST_SW_SETUP = {
+  origin: TEST_ORIGIN,
+  // Page with a body textContent of "NETWORK" and has utils.js loaded.
+  scope: "network_with_utils.html",
+  // SW that serves a body with a textContent of "SERVICEWORKER" and
+  // has utils.js loaded.
+  script: "sw_respondwith_serviceworker.js",
+};
+
+const TEST_STORAGE_SETUP = {
+  cacheBytes: 4 * 1024 * 1024, // 4 MiB
+  idbBytes: 4 * 1024 * 1024, // 4 MiB
+};
+
+const FAULTS_BEFORE_MITIGATION = 3;
+
+/**
+ * Core test iteration logic.
+ *
+ * Parameters:
+ * - name: Human readable name of the fault we're injecting.
+ * - useError: The nsresult failure code to inject into fetch.
+ * - errorPage: The "about" page that we expect errors to leave us on.
+ * - consumeQuotaOrigin: If truthy, the origin to place the storage usage in.
+ *   If falsey, we won't fill storage.
+ */
+async function do_fault_injection_test({
+  name,
+  useError,
+  errorPage,
+  consumeQuotaOrigin,
+}) {
+  info(
+    `### testing: error: ${name} (${useError}) consumeQuotaOrigin: ${consumeQuotaOrigin}`
+  );
+
+  // ## Ensure/confirm the testing origins have no QuotaManager storage in use.
+  await clear_qm_origin_group_via_clearData(TEST_ORIGIN);
+
+  // ## Install the ServiceWorker
+  const reg = await install_sw(TEST_SW_SETUP);
+  const sw = reg.activeWorker;
+
+  // ## Generate quota usage if appropriate
+  if (consumeQuotaOrigin) {
+    await consume_storage(consumeQuotaOrigin, TEST_STORAGE_SETUP);
+  }
+
+  // ## Verify normal navigation is served by the SW.
+  info(`## Checking normal operation.`);
+  {
+    const debugTag = `err=${name}&fault=0`;
+    const docInfo = await navigate_and_get_body(TEST_SW_SETUP, debugTag);
+    is(
+      docInfo.body,
+      "SERVICEWORKER",
+      "navigation without injected fault originates from ServiceWorker"
+    );
+
+    is(
+      docInfo.controlled,
+      true,
+      "successfully intercepted navigation should be controlled"
+    );
+  }
+
+  // Make sure the test is listening on the ServiceWorker unregistration, since
+  // we expect it happens after navigation fault threshold reached.
+  const unregisteredPromise = waitForUnregister(reg.scope);
+
+  // Make sure the test is listening on the finish of quota checking, since we
+  // expect it happens after navigation fault threshold reached.
+  const quotaUsageCheckFinishPromise = waitForQuotaUsageCheckFinish(reg.scope);
+
+  // ## Inject faults in a loop until expected mitigation.
+  sw.testingInjectCancellation = useError;
+  for (let iFault = 0; iFault < FAULTS_BEFORE_MITIGATION; iFault++) {
+    info(`## Testing with injected fault number ${iFault + 1}`);
+    // We should never have triggered an origin quota usage check before the
+    // final fault injection.
+    is(reg.quotaUsageCheckCount, 0, "No quota usage check yet");
+
+    // Make sure our loads encode the specific
+    const debugTag = `err=${name}&fault=${iFault + 1}`;
+
+    const docInfo = await navigate_and_get_body(TEST_SW_SETUP, debugTag);
+    // We should always be receiving network fallback.
+    is(
+      docInfo.body,
+      "NETWORK",
+      "navigation with injected fault originates from network"
+    );
+
+    is(docInfo.controlled, false, "bypassed pages shouldn't be controlled");
+
+    // The fault count should have increased
+    is(
+      sw.navigationFaultCount,
+      iFault + 1,
+      "navigation fault increased (to expected value)"
+    );
+  }
+
+  await unregisteredPromise;
+  is(reg.unregistered, true, "registration should be unregistered");
+
+  //is(reg.quotaUsageCheckCount, 1, "Quota usage check must be started");
+  await quotaUsageCheckFinishPromise;
+
+  if (consumeQuotaOrigin) {
+    // Check that there is no longer any storage usaged by the origin in this
+    // case.
+    const originUsage = await get_qm_origin_usage(TEST_ORIGIN);
+    ok(
+      is_minimum_origin_usage(originUsage),
+      "origin usage should be mitigated"
+    );
+
+    if (consumeQuotaOrigin === SAME_GROUP_ORIGIN) {
+      const sameGroupUsage = await get_qm_origin_usage(SAME_GROUP_ORIGIN);
+      Assert.strictEqual(
+        sameGroupUsage,
+        0,
+        "same group usage should be mitigated"
+      );
+    }
+  }
+}
+
+add_task(async function test_navigation_fetch_fault_handling() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["dom.serviceWorkers.mitigations.bypass_on_fault", true],
+      ["dom.serviceWorkers.mitigations.group_usage_headroom_kb", 5 * 1024],
+      ["dom.quotaManager.testing", true],
+      // We want the temporary global limit to be 10 MiB (the pref is in KiB).
+      // This will result in the group limit also being 10 MiB because on small
+      // disks we provide a group limit value of min(10 MiB, global limit).
+      ["dom.quotaManager.temporaryStorage.fixedLimit", 10 * 1024],
+    ],
+  });
+
+  // Need to reset the storages to make dom.quotaManager.temporaryStorage.fixedLimit
+  // works.
+  await qm_reset_storage();
+
+  const quotaOriginVariations = [
+    // Don't put us near the storage limit.
+    undefined,
+    // Put us near the storage limit in the SW origin itself.
+    TEST_ORIGIN,
+    // Put us near the storage limit in the SW origin's group but not the origin
+    // itself.
+    SAME_GROUP_ORIGIN,
+  ];
+
+  for (const consumeQuotaOrigin of quotaOriginVariations) {
+    await do_fault_injection_test({
+      name: "NS_ERROR_DOM_ABORT_ERR",
+      useError: 0x80530014, // Not in `Cr`.
+      // Abort errors manifest as about:blank pages.
+      errorPage: "about:blank",
+      consumeQuotaOrigin,
+    });
+
+    await do_fault_injection_test({
+      name: "NS_ERROR_INTERCEPTION_FAILED",
+      useError: 0x804b0064, // Not in `Cr`.
+      // Interception failures manifest as corrupt content pages.
+      errorPage: "about:neterror",
+      consumeQuotaOrigin,
+    });
+  }
+
+  // Cleanup: wipe the origin and group so all the ServiceWorkers go away.
+  await clear_qm_origin_group_via_clearData(TEST_ORIGIN);
+});
diff --git a/dom/serviceworkers/test/browser_remote_type_process_swap.js b/dom/serviceworkers/test/browser_remote_type_process_swap.js
new file mode 100644
index 0000000000..3a9f138fa6
--- /dev/null
+++ b/dom/serviceworkers/test/browser_remote_type_process_swap.js
@@ -0,0 +1,138 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * This test tests a navigation request to a Service Worker-controlled origin &
+ * scope that results in a cross-origin redirect to a
+ * non-Service Worker-controlled scope which additionally participates in
+ * cross-process redirect.
+ *
+ * On success, the test will not crash.
+ */
+
+const ORIGIN = "http://mochi.test:8888";
+const TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  ORIGIN
+);
+
+const SW_REGISTER_PAGE_URL = `${TEST_ROOT}empty_with_utils.html`;
+const SW_SCRIPT_URL = `${TEST_ROOT}empty.js`;
+
+const FILE_URL = (() => {
+  // Get the file as an nsIFile.
+  const file = getChromeDir(getResolvedURI(gTestPath));
+  file.append("empty.html");
+
+  // Convert the nsIFile to an nsIURI to access the path.
+  return Services.io.newFileURI(file).spec;
+})();
+
+const CROSS_ORIGIN = "https://example.com";
+const CROSS_ORIGIN_URL = SW_REGISTER_PAGE_URL.replace(ORIGIN, CROSS_ORIGIN);
+const CROSS_ORIGIN_REDIRECT_URL = `${TEST_ROOT}redirect.sjs?${CROSS_ORIGIN_URL}`;
+
+async function loadURI(aXULBrowser, aURI) {
+  const browserLoadedPromise = BrowserTestUtils.browserLoaded(aXULBrowser);
+  BrowserTestUtils.startLoadingURIString(aXULBrowser, aURI);
+
+  return browserLoadedPromise;
+}
+
+async function runTest() {
+  // Step 1: register a Service Worker under `ORIGIN` so that all subsequent
+  // requests to `ORIGIN` will be marked as controlled.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["devtools.console.stdout.content", true],
+    ],
+  });
+
+  info(`Loading tab with page ${SW_REGISTER_PAGE_URL}`);
+  const tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: SW_REGISTER_PAGE_URL,
+  });
+  info(`Loaded page ${SW_REGISTER_PAGE_URL}`);
+
+  info(`Registering Service Worker ${SW_SCRIPT_URL}`);
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [{ scriptURL: SW_SCRIPT_URL }],
+    async ({ scriptURL }) => {
+      await content.wrappedJSObject.registerAndWaitForActive(scriptURL);
+    }
+  );
+  info(`Registered and activated Service Worker ${SW_SCRIPT_URL}`);
+
+  // Step 2: open a page over file:// and navigate to trigger a process swap
+  // for the response.
+  info(`Loading ${FILE_URL}`);
+  await loadURI(tab.linkedBrowser, FILE_URL);
+
+  Assert.equal(
+    tab.linkedBrowser.remoteType,
+    E10SUtils.FILE_REMOTE_TYPE,
+    `${FILE_URL} should load in a file process`
+  );
+
+  info(`Dynamically creating ${FILE_URL}'s link`);
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [{ href: CROSS_ORIGIN_REDIRECT_URL }],
+    ({ href }) => {
+      const { document } = content;
+      const link = document.createElement("a");
+      link.href = href;
+      link.id = "link";
+      link.appendChild(document.createTextNode(href));
+      document.body.appendChild(link);
+    }
+  );
+
+  const redirectPromise = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    CROSS_ORIGIN_URL
+  );
+
+  info("Starting navigation");
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#link",
+    {},
+    tab.linkedBrowser
+  );
+
+  info(`Waiting for location to change to ${CROSS_ORIGIN_URL}`);
+  await redirectPromise;
+
+  info("Waiting for the browser to stop");
+  await BrowserTestUtils.browserStopped(tab.linkedBrowser);
+
+  if (SpecialPowers.useRemoteSubframes) {
+    Assert.ok(
+      E10SUtils.isWebRemoteType(tab.linkedBrowser.remoteType),
+      `${CROSS_ORIGIN_URL} should load in a web-content process`
+    );
+  }
+
+  // Step 3: cleanup.
+  info("Loading initial page to unregister all Service Workers");
+  await loadURI(tab.linkedBrowser, SW_REGISTER_PAGE_URL);
+
+  info("Unregistering all Service Workers");
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [],
+    async () => await content.wrappedJSObject.unregisterAll()
+  );
+
+  info("Closing tab");
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(runTest);
diff --git a/dom/serviceworkers/test/browser_storage_permission.js b/dom/serviceworkers/test/browser_storage_permission.js
new file mode 100644
index 0000000000..0bb99a9781
--- /dev/null
+++ b/dom/serviceworkers/test/browser_storage_permission.js
@@ -0,0 +1,297 @@
+"use strict";
+
+const { PermissionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PermissionTestUtils.sys.mjs"
+);
+
+const BASE_URI = "http://mochi.test:8888/browser/dom/serviceworkers/test/";
+const PAGE_URI = BASE_URI + "empty.html";
+const SCOPE = PAGE_URI + "?storage_permission";
+const SW_SCRIPT = BASE_URI + "empty.js";
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Until the e10s refactor is complete, use a single process to avoid
+      // service worker propagation race.
+      ["dom.ipc.processCount", 1],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  await SpecialPowers.spawn(
+    browser,
+    [{ script: SW_SCRIPT, scope: SCOPE }],
+    async function (opts) {
+      let reg = await content.navigator.serviceWorker.register(opts.script, {
+        scope: opts.scope,
+      });
+      let worker = reg.installing || reg.waiting || reg.active;
+      await new Promise(resolve => {
+        if (worker.state === "activated") {
+          resolve();
+          return;
+        }
+        worker.addEventListener("statechange", function onStateChange() {
+          if (worker.state === "activated") {
+            worker.removeEventListener("statechange", onStateChange);
+            resolve();
+          }
+        });
+      });
+    }
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_allow_permission() {
+  PermissionTestUtils.add(
+    PAGE_URI,
+    "cookie",
+    Ci.nsICookiePermission.ACCESS_ALLOW
+  );
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller, "page should be controlled with storage allowed");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_deny_permission() {
+  PermissionTestUtils.add(
+    PAGE_URI,
+    "cookie",
+    Ci.nsICookiePermission.ACCESS_DENY
+  );
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  is(controller, null, "page should be not controlled with storage denied");
+
+  BrowserTestUtils.removeTab(tab);
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+});
+
+add_task(async function test_session_permission() {
+  PermissionTestUtils.add(
+    PAGE_URI,
+    "cookie",
+    Ci.nsICookiePermission.ACCESS_SESSION
+  );
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  is(controller, null, "page should be not controlled with session storage");
+
+  BrowserTestUtils.removeTab(tab);
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+});
+
+// Test to verify an about:blank iframe successfully inherits the
+// parent's controller when storage is blocked between opening the
+// parent page and creating the iframe.
+add_task(async function test_block_storage_before_blank_iframe() {
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller, "page should be controlled with storage allowed");
+
+  let controller2 = await SpecialPowers.spawn(browser, [], async function () {
+    let f = content.document.createElement("iframe");
+    content.document.body.appendChild(f);
+    await new Promise(resolve => (f.onload = resolve));
+    return !!f.contentWindow.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller2, "page should be controlled with storage allowed");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["network.cookie.cookieBehavior", Ci.nsICookieService.BEHAVIOR_REJECT],
+    ],
+  });
+
+  let controller3 = await SpecialPowers.spawn(browser, [], async function () {
+    let f = content.document.createElement("iframe");
+    content.document.body.appendChild(f);
+    await new Promise(resolve => (f.onload = resolve));
+    return !!f.contentWindow.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller3, "page should be controlled with storage allowed");
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Test to verify a blob URL iframe successfully inherits the
+// parent's controller when storage is blocked between opening the
+// parent page and creating the iframe.
+add_task(async function test_block_storage_before_blob_iframe() {
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller, "page should be controlled with storage allowed");
+
+  let controller2 = await SpecialPowers.spawn(browser, [], async function () {
+    let b = new content.Blob(["<!DOCTYPE html><html></html>"], {
+      type: "text/html",
+    });
+    let f = content.document.createElement("iframe");
+    // No need to call revokeObjectURL() since the window will be closed shortly.
+    f.src = content.URL.createObjectURL(b);
+    content.document.body.appendChild(f);
+    await new Promise(resolve => (f.onload = resolve));
+    return !!f.contentWindow.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller2, "page should be controlled with storage allowed");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["network.cookie.cookieBehavior", Ci.nsICookieService.BEHAVIOR_REJECT],
+    ],
+  });
+
+  let controller3 = await SpecialPowers.spawn(browser, [], async function () {
+    let b = new content.Blob(["<!DOCTYPE html><html></html>"], {
+      type: "text/html",
+    });
+    let f = content.document.createElement("iframe");
+    // No need to call revokeObjectURL() since the window will be closed shortly.
+    f.src = content.URL.createObjectURL(b);
+    content.document.body.appendChild(f);
+    await new Promise(resolve => (f.onload = resolve));
+    return !!f.contentWindow.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller3, "page should be controlled with storage allowed");
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Test to verify a blob worker script does not hit our service
+// worker storage assertions when storage is blocked between opening
+// the parent page and creating the worker.  Note, we cannot
+// explicitly check if the worker is controlled since we don't expose
+// WorkerNavigator.serviceWorkers.controller yet.
+add_task(async function test_block_storage_before_blob_worker() {
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, SCOPE);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let controller = await SpecialPowers.spawn(browser, [], async function () {
+    return content.navigator.serviceWorker.controller;
+  });
+
+  ok(!!controller, "page should be controlled with storage allowed");
+
+  let scriptURL = await SpecialPowers.spawn(browser, [], async function () {
+    let b = new content.Blob(
+      ["self.postMessage(self.location.href);self.close()"],
+      { type: "application/javascript" }
+    );
+    // No need to call revokeObjectURL() since the window will be closed shortly.
+    let u = content.URL.createObjectURL(b);
+    let w = new content.Worker(u);
+    return await new Promise(resolve => {
+      w.onmessage = e => resolve(e.data);
+    });
+  });
+
+  ok(scriptURL.startsWith("blob:"), "blob URL worker should run");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["network.cookie.cookieBehavior", Ci.nsICookieService.BEHAVIOR_REJECT],
+    ],
+  });
+
+  let scriptURL2 = await SpecialPowers.spawn(browser, [], async function () {
+    let b = new content.Blob(
+      ["self.postMessage(self.location.href);self.close()"],
+      { type: "application/javascript" }
+    );
+    // No need to call revokeObjectURL() since the window will be closed shortly.
+    let u = content.URL.createObjectURL(b);
+    let w = new content.Worker(u);
+    return await new Promise(resolve => {
+      w.onmessage = e => resolve(e.data);
+    });
+  });
+
+  ok(scriptURL2.startsWith("blob:"), "blob URL worker should run");
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function cleanup() {
+  PermissionTestUtils.remove(PAGE_URI, "cookie");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  await SpecialPowers.spawn(browser, [SCOPE], async function (uri) {
+    let reg = await content.navigator.serviceWorker.getRegistration(uri);
+    let worker = reg.active;
+    await reg.unregister();
+    await new Promise(resolve => {
+      if (worker.state === "redundant") {
+        resolve();
+        return;
+      }
+      worker.addEventListener("statechange", function onStateChange() {
+        if (worker.state === "redundant") {
+          worker.removeEventListener("statechange", onStateChange);
+          resolve();
+        }
+      });
+    });
+  });
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/dom/serviceworkers/test/browser_storage_recovery.js b/dom/serviceworkers/test/browser_storage_recovery.js
new file mode 100644
index 0000000000..8b4a1181f7
--- /dev/null
+++ b/dom/serviceworkers/test/browser_storage_recovery.js
@@ -0,0 +1,156 @@
+"use strict";
+
+// This test registers a SW for a scope that will never control a document
+// and therefore never trigger a "fetch" functional event that would
+// automatically attempt to update the registration.  The overlap of the
+// PAGE_URI and SCOPE is incidental.  checkForUpdate is the only thing that
+// will trigger an update of the registration and so there is no need to
+// worry about Schedule Job races to coalesce an update job.
+
+const BASE_URI = "http://mochi.test:8888/browser/dom/serviceworkers/test/";
+const PAGE_URI = BASE_URI + "empty.html";
+const SCOPE = PAGE_URI + "?storage_recovery";
+const SW_SCRIPT = BASE_URI + "storage_recovery_worker.sjs";
+
+async function checkForUpdate(browser) {
+  return SpecialPowers.spawn(browser, [SCOPE], async function (uri) {
+    let reg = await content.navigator.serviceWorker.getRegistration(uri);
+    await reg.update();
+    return !!reg.installing;
+  });
+}
+
+// Delete all of our chrome-namespace Caches for this origin, leaving any
+// content-owned caches in place.  This is exclusively for simulating loss
+// of the origin's storage without loss of the registration and without
+// having to worry that future enhancements to QuotaClients/ServiceWorkerRegistrar
+// will break this test.  If you want to wipe storage for an origin, use
+// QuotaManager APIs
+async function wipeStorage(u) {
+  let uri = Services.io.newURI(u);
+  let principal = Services.scriptSecurityManager.createContentPrincipal(
+    uri,
+    {}
+  );
+  let caches = new CacheStorage("chrome", principal);
+  let list = await caches.keys();
+  return Promise.all(list.map(c => caches.delete(c)));
+}
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["dom.serviceWorkers.idle_timeout", 0],
+    ],
+  });
+
+  // Configure the server script to not redirect.
+  await fetch(SW_SCRIPT + "?clear-redirect");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  await SpecialPowers.spawn(
+    browser,
+    [{ script: SW_SCRIPT, scope: SCOPE }],
+    async function (opts) {
+      let reg = await content.navigator.serviceWorker.register(opts.script, {
+        scope: opts.scope,
+      });
+      let worker = reg.installing || reg.waiting || reg.active;
+      await new Promise(resolve => {
+        if (worker.state === "activated") {
+          resolve();
+          return;
+        }
+        worker.addEventListener("statechange", function onStateChange() {
+          if (worker.state === "activated") {
+            worker.removeEventListener("statechange", onStateChange);
+            resolve();
+          }
+        });
+      });
+    }
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Verify that our service worker doesn't update normally.
+add_task(async function normal_update_check() {
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let updated = await checkForUpdate(browser);
+  ok(!updated, "normal update check should not trigger an update");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Test what happens when we wipe the service worker scripts
+// out from under the site before triggering the update.  This
+// should cause an update to occur.
+add_task(async function wiped_update_check() {
+  // Wipe the backing cache storage, but leave the SW registered.
+  await wipeStorage(PAGE_URI);
+
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let updated = await checkForUpdate(browser);
+  ok(updated, "wiping the service worker scripts should trigger an update");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Test what happens when we wipe the service worker scripts
+// out from under the site before triggering the update.  This
+// should cause an update to occur.
+add_task(async function wiped_and_failed_update_check() {
+  // Wipe the backing cache storage, but leave the SW registered.
+  await wipeStorage(PAGE_URI);
+
+  // Configure the service worker script to redirect.  This will
+  // prevent the update from completing successfully.
+  await fetch(SW_SCRIPT + "?set-redirect");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, PAGE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  // Attempt to update the service worker.  This should throw
+  // an error because the script is now redirecting.
+  let updateFailed = false;
+  try {
+    await checkForUpdate(browser);
+  } catch (e) {
+    updateFailed = true;
+  }
+  ok(updateFailed, "redirecting service worker script should fail to update");
+
+  // Also, since the existing service worker's scripts are broken
+  // we should also remove the registration completely when the
+  // update fails.
+  let exists = await SpecialPowers.spawn(
+    browser,
+    [SCOPE],
+    async function (uri) {
+      let reg = await content.navigator.serviceWorker.getRegistration(uri);
+      return !!reg;
+    }
+  );
+  ok(
+    !exists,
+    "registration should be removed after scripts are wiped and update fails"
+  );
+
+  // Note, we don't have to clean up the service worker registration
+  // since its effectively been force-removed here.
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/dom/serviceworkers/test/browser_unregister_with_containers.js b/dom/serviceworkers/test/browser_unregister_with_containers.js
new file mode 100644
index 0000000000..c147e50f6e
--- /dev/null
+++ b/dom/serviceworkers/test/browser_unregister_with_containers.js
@@ -0,0 +1,153 @@
+"use strict";
+
+const BASE_URI = "http://mochi.test:8888/browser/dom/serviceworkers/test/";
+const PAGE_URI = BASE_URI + "empty.html";
+const SCOPE = PAGE_URI + "?unregister_with_containers";
+const SW_SCRIPT = BASE_URI + "empty.js";
+
+function doRegister(browser) {
+  return SpecialPowers.spawn(
+    browser,
+    [{ script: SW_SCRIPT, scope: SCOPE }],
+    async function (opts) {
+      let reg = await content.navigator.serviceWorker.register(opts.script, {
+        scope: opts.scope,
+      });
+      let worker = reg.installing || reg.waiting || reg.active;
+      await new Promise(resolve => {
+        if (worker.state === "activated") {
+          resolve();
+          return;
+        }
+        worker.addEventListener("statechange", function onStateChange() {
+          if (worker.state === "activated") {
+            worker.removeEventListener("statechange", onStateChange);
+            resolve();
+          }
+        });
+      });
+    }
+  );
+}
+
+function doUnregister(browser) {
+  return SpecialPowers.spawn(browser, [SCOPE], async function (uri) {
+    let reg = await content.navigator.serviceWorker.getRegistration(uri);
+    let worker = reg.active;
+    await reg.unregister();
+    await new Promise(resolve => {
+      if (worker.state === "redundant") {
+        resolve();
+        return;
+      }
+      worker.addEventListener("statechange", function onStateChange() {
+        if (worker.state === "redundant") {
+          worker.removeEventListener("statechange", onStateChange);
+          resolve();
+        }
+      });
+    });
+  });
+}
+
+function isControlled(browser) {
+  return SpecialPowers.spawn(browser, [], function () {
+    return !!content.navigator.serviceWorker.controller;
+  });
+}
+
+async function checkControlled(browser) {
+  let controlled = await isControlled(browser);
+  ok(controlled, "window should be controlled");
+}
+
+async function checkUncontrolled(browser) {
+  let controlled = await isControlled(browser);
+  ok(!controlled, "window should not be controlled");
+}
+
+add_task(async function test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Avoid service worker propagation races by disabling multi-e10s for now.
+      // This can be removed after the e10s refactor is complete.
+      ["dom.ipc.processCount", 1],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  // Setup service workers in two different contexts with the same scope.
+  let containerTab1 = BrowserTestUtils.addTab(gBrowser, PAGE_URI, {
+    userContextId: 1,
+  });
+  let containerBrowser1 = gBrowser.getBrowserForTab(containerTab1);
+  await BrowserTestUtils.browserLoaded(containerBrowser1);
+
+  let containerTab2 = BrowserTestUtils.addTab(gBrowser, PAGE_URI, {
+    userContextId: 2,
+  });
+  let containerBrowser2 = gBrowser.getBrowserForTab(containerTab2);
+  await BrowserTestUtils.browserLoaded(containerBrowser2);
+
+  await doRegister(containerBrowser1);
+  await doRegister(containerBrowser2);
+
+  await checkUncontrolled(containerBrowser1);
+  await checkUncontrolled(containerBrowser2);
+
+  // Close the tabs we used to register the service workers.  These are not
+  // controlled.
+  BrowserTestUtils.removeTab(containerTab1);
+  BrowserTestUtils.removeTab(containerTab2);
+
+  // Open a controlled tab in each container.
+  containerTab1 = BrowserTestUtils.addTab(gBrowser, SCOPE, {
+    userContextId: 1,
+  });
+  containerBrowser1 = gBrowser.getBrowserForTab(containerTab1);
+  await BrowserTestUtils.browserLoaded(containerBrowser1);
+
+  containerTab2 = BrowserTestUtils.addTab(gBrowser, SCOPE, {
+    userContextId: 2,
+  });
+  containerBrowser2 = gBrowser.getBrowserForTab(containerTab2);
+  await BrowserTestUtils.browserLoaded(containerBrowser2);
+
+  await checkControlled(containerBrowser1);
+  await checkControlled(containerBrowser2);
+
+  // Remove the first container's controlled tab
+  BrowserTestUtils.removeTab(containerTab1);
+
+  // Create a new uncontrolled tab for the first container and use it to
+  // unregister the service worker.
+  containerTab1 = BrowserTestUtils.addTab(gBrowser, PAGE_URI, {
+    userContextId: 1,
+  });
+  containerBrowser1 = gBrowser.getBrowserForTab(containerTab1);
+  await BrowserTestUtils.browserLoaded(containerBrowser1);
+  await doUnregister(containerBrowser1);
+
+  await checkUncontrolled(containerBrowser1);
+  await checkControlled(containerBrowser2);
+
+  // Remove the second container's controlled tab
+  BrowserTestUtils.removeTab(containerTab2);
+
+  // Create a new uncontrolled tab for the second container and use it to
+  // unregister the service worker.
+  containerTab2 = BrowserTestUtils.addTab(gBrowser, PAGE_URI, {
+    userContextId: 2,
+  });
+  containerBrowser2 = gBrowser.getBrowserForTab(containerTab2);
+  await BrowserTestUtils.browserLoaded(containerBrowser2);
+  await doUnregister(containerBrowser2);
+
+  await checkUncontrolled(containerBrowser1);
+  await checkUncontrolled(containerBrowser2);
+
+  // Close the two tabs we used to unregister the service worker.
+  BrowserTestUtils.removeTab(containerTab1);
+  BrowserTestUtils.removeTab(containerTab2);
+});
diff --git a/dom/serviceworkers/test/browser_userContextId_openWindow.js b/dom/serviceworkers/test/browser_userContextId_openWindow.js
new file mode 100644
index 0000000000..8a08d92cb1
--- /dev/null
+++ b/dom/serviceworkers/test/browser_userContextId_openWindow.js
@@ -0,0 +1,161 @@
+let Cm = Components.manager;
+
+let swm = Cc["@mozilla.org/serviceworkers/manager;1"].getService(
+  Ci.nsIServiceWorkerManager
+);
+
+const URI = "https://example.com/browser/dom/serviceworkers/test/empty.html";
+const MOCK_CID = Components.ID("{2a0f83c4-8818-4914-a184-f1172b4eaaa7}");
+const ALERTS_SERVICE_CONTRACT_ID = "@mozilla.org/alerts-service;1";
+const USER_CONTEXT_ID = 3;
+
+let mockAlertsService = {
+  showAlert(alert, alertListener) {
+    ok(true, "Showing alert");
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(function () {
+      alertListener.observe(null, "alertshow", alert.cookie);
+    }, 100);
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(function () {
+      alertListener.observe(null, "alertclickcallback", alert.cookie);
+    }, 100);
+  },
+
+  showAlertNotification(
+    imageUrl,
+    title,
+    text,
+    textClickable,
+    cookie,
+    alertListener,
+    name,
+    dir,
+    lang,
+    data
+  ) {
+    this.showAlert();
+  },
+
+  QueryInterface(aIID) {
+    if (aIID.equals(Ci.nsISupports) || aIID.equals(Ci.nsIAlertsService)) {
+      return this;
+    }
+    throw Components.Exception("", Cr.NS_ERROR_NO_INTERFACE);
+  },
+
+  createInstance(aIID) {
+    return this.QueryInterface(aIID);
+  },
+};
+
+registerCleanupFunction(() => {
+  Cm.QueryInterface(Ci.nsIComponentRegistrar).unregisterFactory(
+    MOCK_CID,
+    mockAlertsService
+  );
+});
+
+add_setup(async function () {
+  // make sure userContext, SW and notifications are enabled.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.userContext.enabled", true],
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["notification.prompt.testing", true],
+      ["dom.serviceWorkers.disable_open_click_delay", 1000],
+      ["dom.serviceWorkers.idle_timeout", 299999],
+      ["dom.serviceWorkers.idle_extended_timeout", 299999],
+      ["browser.link.open_newwindow", 3],
+    ],
+  });
+});
+
+add_task(async function test() {
+  Cm.QueryInterface(Ci.nsIComponentRegistrar).registerFactory(
+    MOCK_CID,
+    "alerts service",
+    ALERTS_SERVICE_CONTRACT_ID,
+    mockAlertsService
+  );
+
+  // open the tab in the correct userContextId
+  let tab = BrowserTestUtils.addTab(gBrowser, URI, {
+    userContextId: USER_CONTEXT_ID,
+  });
+  let browser = gBrowser.getBrowserForTab(tab);
+
+  // select tab and make sure its browser is focused
+  gBrowser.selectedTab = tab;
+  tab.ownerGlobal.focus();
+
+  // wait for tab load
+  await BrowserTestUtils.browserLoaded(gBrowser.getBrowserForTab(tab));
+
+  // Waiting for new tab.
+  let newTabPromise = BrowserTestUtils.waitForNewTab(gBrowser, null, true);
+
+  // here the test.
+  /* eslint-disable no-shadow */
+  let uci = await SpecialPowers.spawn(browser, [URI], uri => {
+    let uci = content.document.nodePrincipal.userContextId;
+
+    // Registration of the SW
+    return (
+      content.navigator.serviceWorker
+        .register("file_userContextId_openWindow.js")
+
+        // Activation
+        .then(swr => {
+          return new content.window.Promise(resolve => {
+            let worker = swr.installing;
+            worker.addEventListener("statechange", () => {
+              if (worker.state === "activated") {
+                resolve(swr);
+              }
+            });
+          });
+        })
+
+        // Ask for an openWindow.
+        .then(swr => {
+          swr.showNotification("testPopup");
+          return uci;
+        })
+    );
+  });
+  /* eslint-enable no-shadow */
+
+  is(uci, USER_CONTEXT_ID, "Tab runs with UCI " + USER_CONTEXT_ID);
+
+  let newTab = await newTabPromise;
+
+  is(
+    newTab.getAttribute("usercontextid"),
+    USER_CONTEXT_ID,
+    "New tab has UCI equal " + USER_CONTEXT_ID
+  );
+
+  // wait for SW unregistration
+  /* eslint-disable no-shadow */
+  uci = await SpecialPowers.spawn(browser, [], () => {
+    let uci = content.document.nodePrincipal.userContextId;
+
+    return content.navigator.serviceWorker
+      .getRegistration(".")
+      .then(registration => {
+        return registration.unregister();
+      })
+      .then(() => {
+        return uci;
+      });
+  });
+  /* eslint-enable no-shadow */
+
+  is(uci, USER_CONTEXT_ID, "Tab runs with UCI " + USER_CONTEXT_ID);
+
+  BrowserTestUtils.removeTab(newTab);
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/dom/serviceworkers/test/bug1151916_driver.html b/dom/serviceworkers/test/bug1151916_driver.html
new file mode 100644
index 0000000000..08e7d9414f
--- /dev/null
+++ b/dom/serviceworkers/test/bug1151916_driver.html
@@ -0,0 +1,53 @@
+<html>
+  <body>
+    <script language="javascript">
+      function fail(msg) {
+        window.parent.postMessage({ status: "failed", message: msg }, "*");
+      }
+
+      function success(msg) {
+        window.parent.postMessage({ status: "success", message: msg }, "*");
+      }
+
+      if (!window.parent) {
+        dump("This file must be embedded in an iframe!");
+      }
+
+      navigator.serviceWorker.getRegistration()
+      .then(function(reg) {
+        if (!reg) {
+          navigator.serviceWorker.ready.then(function(registration) {
+            if (registration.active.state == "activating") {
+              registration.active.onstatechange = function(e) {
+                registration.active.onstatechange = null;
+                if (registration.active.state == "activated") {
+                  success("Registered and activated");
+                }
+              }
+            } else {
+              success("Registered and activated");
+            }
+          });
+          navigator.serviceWorker.register("bug1151916_worker.js",
+                                           { scope: "." });
+        } else {
+          // Simply force the sw to load a resource and touch self.caches.
+          if (!reg.active) {
+            fail("no-active-worker");
+            return;
+          }
+
+          fetch("madeup.txt").then(function(res) {
+            res.text().then(function(v) {
+              if (v == "Hi there") {
+                success("Loaded from cache");
+              } else {
+                fail("Response text did not match");
+              }
+            }, fail);
+          }, fail);
+        }
+      }, fail);
+    </script>
+  </body>
+</html>
diff --git a/dom/serviceworkers/test/bug1151916_worker.js b/dom/serviceworkers/test/bug1151916_worker.js
new file mode 100644
index 0000000000..6bd26850bf
--- /dev/null
+++ b/dom/serviceworkers/test/bug1151916_worker.js
@@ -0,0 +1,15 @@
+onactivate = function (e) {
+  e.waitUntil(
+    self.caches.open("default-cache").then(function (cache) {
+      var response = new Response("Hi there");
+      return cache.put("madeup.txt", response);
+    })
+  );
+};
+
+onfetch = function (e) {
+  if (e.request.url.match(/madeup.txt$/)) {
+    var p = self.caches.match("madeup.txt", { cacheName: "default-cache" });
+    e.respondWith(p);
+  }
+};
diff --git a/dom/serviceworkers/test/bug1240436_worker.js b/dom/serviceworkers/test/bug1240436_worker.js
new file mode 100644
index 0000000000..c21f60b60f
--- /dev/null
+++ b/dom/serviceworkers/test/bug1240436_worker.js
@@ -0,0 +1,2 @@
+// a contains a ZERO WIDTH JOINER (0x200D)
+var a = "‍";
diff --git a/dom/serviceworkers/test/chrome-common.toml b/dom/serviceworkers/test/chrome-common.toml
new file mode 100644
index 0000000000..e486456d11
--- /dev/null
+++ b/dom/serviceworkers/test/chrome-common.toml
@@ -0,0 +1,26 @@
+[DEFAULT]
+skip-if = ["os == 'android'"]
+support-files = [
+  "chrome_helpers.js",
+  "empty.js",
+  "fetch.js",
+  "hello.html",
+  "serviceworker.html",
+  "serviceworkerinfo_iframe.html",
+  "serviceworkermanager_iframe.html",
+  "serviceworkerregistrationinfo_iframe.html",
+  "utils.js",
+  "worker.js",
+  "worker2.js",
+]
+
+["test_devtools_track_serviceworker_time.html"]
+
+["test_privateBrowsing.html"]
+
+["test_serviceworkerinfo.xhtml"]
+skip-if = ["serviceworker_e10s"] # nsIWorkerDebugger attribute not implemented
+
+["test_serviceworkermanager.xhtml"]
+
+["test_serviceworkerregistrationinfo.xhtml"]
diff --git a/dom/serviceworkers/test/chrome-dFPI.toml b/dom/serviceworkers/test/chrome-dFPI.toml
new file mode 100644
index 0000000000..1aee0a219f
--- /dev/null
+++ b/dom/serviceworkers/test/chrome-dFPI.toml
@@ -0,0 +1,6 @@
+[DEFAULT]
+# Enable dFPI(cookieBehavior 5) for service worker tests.
+prefs = ["network.cookie.cookieBehavior=5"]
+dupe-manifest = true
+
+["include:chrome-common.toml"]
diff --git a/dom/serviceworkers/test/chrome.toml b/dom/serviceworkers/test/chrome.toml
new file mode 100644
index 0000000000..02efcc145d
--- /dev/null
+++ b/dom/serviceworkers/test/chrome.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+dupe-manifest = true
+
+["include:chrome-common.toml"]
diff --git a/dom/serviceworkers/test/chrome_helpers.js b/dom/serviceworkers/test/chrome_helpers.js
new file mode 100644
index 0000000000..9aaeb95625
--- /dev/null
+++ b/dom/serviceworkers/test/chrome_helpers.js
@@ -0,0 +1,71 @@
+let swm = Cc["@mozilla.org/serviceworkers/manager;1"].getService(
+  Ci.nsIServiceWorkerManager
+);
+
+let EXAMPLE_URL = "https://example.com/chrome/dom/serviceworkers/test/";
+
+function waitForIframeLoad(iframe) {
+  return new Promise(function (resolve) {
+    iframe.onload = resolve;
+  });
+}
+
+function waitForRegister(scope, callback) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onRegister(registration) {
+        if (registration.scope !== scope) {
+          return;
+        }
+        swm.removeListener(listener);
+        resolve(callback ? callback(registration) : registration);
+      },
+    };
+    swm.addListener(listener);
+  });
+}
+
+function waitForUnregister(scope) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onUnregister(registration) {
+        if (registration.scope !== scope) {
+          return;
+        }
+        swm.removeListener(listener);
+        resolve(registration);
+      },
+    };
+    swm.addListener(listener);
+  });
+}
+
+function waitForServiceWorkerRegistrationChange(registration, callback) {
+  return new Promise(function (resolve) {
+    let listener = {
+      onChange() {
+        registration.removeListener(listener);
+        if (callback) {
+          callback();
+        }
+        resolve(callback ? callback() : undefined);
+      },
+    };
+    registration.addListener(listener);
+  });
+}
+
+function waitForServiceWorkerShutdown() {
+  return new Promise(function (resolve) {
+    let observer = {
+      observe(subject, topic, data) {
+        if (topic !== "service-worker-shutdown") {
+          return;
+        }
+        SpecialPowers.removeObserver(observer, "service-worker-shutdown");
+        resolve();
+      },
+    };
+    SpecialPowers.addObserver(observer, "service-worker-shutdown");
+  });
+}
diff --git a/dom/serviceworkers/test/claim_clients/client.html b/dom/serviceworkers/test/claim_clients/client.html
new file mode 100644
index 0000000000..969a6dbf10
--- /dev/null
+++ b/dom/serviceworkers/test/claim_clients/client.html
@@ -0,0 +1,43 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1130684 - claim client </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    info("This page shouldn't be launched directly!");
+  }
+
+  window.onload = function() {
+    parent.postMessage("READY", "*");
+  }
+
+  navigator.serviceWorker.oncontrollerchange = function() {
+    parent.postMessage({
+      event: "controllerchange",
+      controller: (navigator.serviceWorker.controller !== null)
+    }, "*");
+  }
+
+  navigator.serviceWorker.onmessage = function(e) {
+    parent.postMessage({
+      event: "message",
+      data: e.data
+    }, "*");
+  }
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/claim_oninstall_worker.js b/dom/serviceworkers/test/claim_oninstall_worker.js
new file mode 100644
index 0000000000..82c6999031
--- /dev/null
+++ b/dom/serviceworkers/test/claim_oninstall_worker.js
@@ -0,0 +1,7 @@
+oninstall = function (e) {
+  var claimFailedPromise = new Promise(function (resolve, reject) {
+    clients.claim().then(reject, () => resolve());
+  });
+
+  e.waitUntil(claimFailedPromise);
+};
diff --git a/dom/serviceworkers/test/claim_worker_1.js b/dom/serviceworkers/test/claim_worker_1.js
new file mode 100644
index 0000000000..60ba5dfc5d
--- /dev/null
+++ b/dom/serviceworkers/test/claim_worker_1.js
@@ -0,0 +1,32 @@
+onactivate = function (e) {
+  var result = {
+    resolve_value: false,
+    match_count_before: -1,
+    match_count_after: -1,
+    message: "claim_worker_1",
+  };
+
+  self.clients
+    .matchAll()
+    .then(function (matched) {
+      // should be 0
+      result.match_count_before = matched.length;
+    })
+    .then(function () {
+      return self.clients.claim();
+    })
+    .then(function (ret) {
+      result.resolve_value = ret;
+      return self.clients.matchAll();
+    })
+    .then(function (matched) {
+      // should be 2
+      result.match_count_after = matched.length;
+      for (i = 0; i < matched.length; i++) {
+        matched[i].postMessage(result);
+      }
+      if (result.match_count_after !== 2) {
+        dump("ERROR: claim_worker_1 failed to capture clients.\n");
+      }
+    });
+};
diff --git a/dom/serviceworkers/test/claim_worker_2.js b/dom/serviceworkers/test/claim_worker_2.js
new file mode 100644
index 0000000000..4293873da7
--- /dev/null
+++ b/dom/serviceworkers/test/claim_worker_2.js
@@ -0,0 +1,34 @@
+onactivate = function (e) {
+  var result = {
+    resolve_value: false,
+    match_count_before: -1,
+    match_count_after: -1,
+    message: "claim_worker_2",
+  };
+
+  self.clients
+    .matchAll()
+    .then(function (matched) {
+      // should be 0
+      result.match_count_before = matched.length;
+    })
+    .then(function () {
+      return clients.claim();
+    })
+    .then(function (ret) {
+      result.resolve_value = ret;
+      return clients.matchAll();
+    })
+    .then(function (matched) {
+      // should be 1
+      result.match_count_after = matched.length;
+      if (result.match_count_after === 1) {
+        matched[0].postMessage(result);
+      } else {
+        dump("ERROR: claim_worker_2 failed to capture clients.\n");
+        for (let i = 0; i < matched.length; ++i) {
+          dump("### ### matched[" + i + "]: " + matched[i].url + "\n");
+        }
+      }
+    });
+};
diff --git a/dom/serviceworkers/test/close_test.js b/dom/serviceworkers/test/close_test.js
new file mode 100644
index 0000000000..07f85617ef
--- /dev/null
+++ b/dom/serviceworkers/test/close_test.js
@@ -0,0 +1,22 @@
+function ok(v, msg) {
+  client.postMessage({ status: "ok", result: !!v, message: msg });
+}
+
+var client;
+onmessage = function (e) {
+  if (e.data.message == "start") {
+    self.clients.matchAll().then(function (clients) {
+      client = clients[0];
+      try {
+        close();
+        ok(false, "close() should throw");
+      } catch (ex) {
+        ok(
+          ex.name === "InvalidAccessError",
+          "close() should throw InvalidAccessError"
+        );
+      }
+      client.postMessage({ status: "done" });
+    });
+  }
+};
diff --git a/dom/serviceworkers/test/console_monitor.js b/dom/serviceworkers/test/console_monitor.js
new file mode 100644
index 0000000000..099feb646d
--- /dev/null
+++ b/dom/serviceworkers/test/console_monitor.js
@@ -0,0 +1,44 @@
+/* eslint-env mozilla/chrome-script */
+
+let consoleListener;
+
+function ConsoleListener() {
+  Services.console.registerListener(this);
+}
+
+ConsoleListener.prototype = {
+  callbacks: [],
+
+  observe: aMsg => {
+    if (!(aMsg instanceof Ci.nsIScriptError)) {
+      return;
+    }
+
+    let msg = {
+      cssSelectors: aMsg.cssSelectors,
+      errorMessage: aMsg.errorMessage,
+      sourceName: aMsg.sourceName,
+      sourceLine: aMsg.sourceLine,
+      lineNumber: aMsg.lineNumber,
+      columnNumber: aMsg.columnNumber,
+      category: aMsg.category,
+      windowID: aMsg.outerWindowID,
+      innerWindowID: aMsg.innerWindowID,
+      isScriptError: true,
+      isWarning: (aMsg.flags & Ci.nsIScriptError.warningFlag) === 1,
+    };
+
+    sendAsyncMessage("monitor", msg);
+  },
+};
+
+addMessageListener("load", function (e) {
+  consoleListener = new ConsoleListener();
+  sendAsyncMessage("ready", {});
+});
+
+addMessageListener("unload", function (e) {
+  Services.console.unregisterListener(consoleListener);
+  consoleListener = null;
+  sendAsyncMessage("unloaded", {});
+});
diff --git a/dom/serviceworkers/test/controller/index.html b/dom/serviceworkers/test/controller/index.html
new file mode 100644
index 0000000000..2a68e3f4bb
--- /dev/null
+++ b/dom/serviceworkers/test/controller/index.html
@@ -0,0 +1,72 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 94048 - test install event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  // Make sure to use good, unique messages, since the actual expression will not show up in test results.
+  function my_ok(result, msg) {
+    parent.postMessage({status: "ok", result, message: msg}, "*");
+  }
+
+  function finish() {
+    parent.postMessage({status: "done"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(function(swr) {
+    my_ok(swr.scope.match(/serviceworkers\/test\/control$/),
+          "This page should be controlled by upper level registration");
+    my_ok(swr.installing == undefined,
+          "Upper level registration should not have a installing worker.");
+    if (navigator.serviceWorker.controller) {
+      // We are controlled.
+      // Register a new worker for this sub-scope. After that, controller should still be for upper level, but active should change to be this scope's.
+      navigator.serviceWorker.register("../worker2.js", { scope: "./" }).then(function(e) {
+        my_ok("installing" in e, "ServiceWorkerRegistration.installing exists.");
+        my_ok(e.installing instanceof ServiceWorker, "ServiceWorkerRegistration.installing is a ServiceWorker.");
+
+        my_ok("waiting" in e, "ServiceWorkerRegistration.waiting exists.");
+        my_ok("active" in e, "ServiceWorkerRegistration.active exists.");
+
+        my_ok(e.installing &&
+              e.installing.scriptURL.match(/worker2.js$/),
+              "Installing is serviceworker/controller");
+
+        my_ok("scope" in e, "ServiceWorkerRegistration.scope exists.");
+        my_ok(e.scope.match(/serviceworkers\/test\/controller\/$/), "Scope is serviceworker/test/controller " + e.scope);
+
+        my_ok("unregister" in e, "ServiceWorkerRegistration.unregister exists.");
+
+        my_ok(navigator.serviceWorker.controller.scriptURL.match(/worker\.js$/),
+              "Controller is still worker.js");
+
+        e.unregister().then(function(result) {
+          my_ok(result, "Unregistering the SW should succeed");
+          finish();
+        }, function(error) {
+          dump("Error unregistering the SW: " + error + "\n");
+        });
+      });
+    } else {
+      my_ok(false, "Should've been controlled!");
+      finish();
+    }
+  }).catch(function(e) {
+    my_ok(false, "Some test threw an error " + e);
+    finish();
+  });
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/create_another_sharedWorker.html b/dom/serviceworkers/test/create_another_sharedWorker.html
new file mode 100644
index 0000000000..f49194fa50
--- /dev/null
+++ b/dom/serviceworkers/test/create_another_sharedWorker.html
@@ -0,0 +1,6 @@
+<!DOCTYPE HTML>
+<title>Shared workers: create antoehr sharedworekr client</title>
+<pre id=log>Hello World</pre>
+<script>
+  var worker = new SharedWorker('sharedWorker_fetch.js');
+</script>
diff --git a/dom/serviceworkers/test/download/window.html b/dom/serviceworkers/test/download/window.html
new file mode 100644
index 0000000000..5ca3c76f93
--- /dev/null
+++ b/dom/serviceworkers/test/download/window.html
@@ -0,0 +1,47 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+<script type="text/javascript">
+
+function wait_until_controlled() {
+  return new Promise(function(resolve) {
+    if (navigator.serviceWorker.controller) {
+      resolve();
+      return;
+    }
+    navigator.serviceWorker.addEventListener('controllerchange', function onController() {
+      if (navigator.serviceWorker.controller) {
+        navigator.serviceWorker.removeEventListener('controllerchange', onController);
+        resolve();
+      }
+    });
+  });
+}
+addEventListener('load', function(event) {
+  var registration;
+  navigator.serviceWorker.register('worker.js').then(function(swr) {
+    registration = swr;
+
+    // While the iframe below is a navigation, we still wait until we are
+    // controlled here.  We want an active client to hold the service worker
+    // alive since it calls unregister() on itself.
+    return wait_until_controlled();
+
+  }).then(function() {
+    var frame = document.createElement('iframe');
+    document.body.appendChild(frame);
+    frame.src = 'fake_download';
+
+    // The service worker is unregistered in the fetch event.  The window and
+    // frame are cleaned up from the browser chrome script.
+  });
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/download/worker.js b/dom/serviceworkers/test/download/worker.js
new file mode 100644
index 0000000000..d96f18b34d
--- /dev/null
+++ b/dom/serviceworkers/test/download/worker.js
@@ -0,0 +1,34 @@
+addEventListener("install", function (evt) {
+  evt.waitUntil(self.skipWaiting());
+});
+
+addEventListener("activate", function (evt) {
+  // We claim the current clients in order to ensure that we have an
+  // active client when we call unregister in the fetch handler.  Otherwise
+  // the unregister() can kill the current worker before returning a
+  // response.
+  evt.waitUntil(clients.claim());
+});
+
+addEventListener("fetch", function (evt) {
+  // This worker may live long enough to receive a fetch event from the next
+  // test.  Just pass such requests through to the network.
+  if (!evt.request.url.includes("fake_download")) {
+    return;
+  }
+
+  // We should only get a single download fetch event. Automatically unregister.
+  evt.respondWith(
+    registration.unregister().then(function () {
+      return new Response("service worker generated download", {
+        headers: {
+          "Content-Disposition": 'attachment; filename="fake_download.bin"',
+          // Prevent the default text editor from being launched
+          "Content-Type": "application/octet-stream",
+          // fake encoding header that should have no effect
+          "Content-Encoding": "gzip",
+        },
+      });
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/download_canceled/page_download_canceled.html b/dom/serviceworkers/test/download_canceled/page_download_canceled.html
new file mode 100644
index 0000000000..dd67709004
--- /dev/null
+++ b/dom/serviceworkers/test/download_canceled/page_download_canceled.html
@@ -0,0 +1,59 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+
+<script src="../utils.js"></script>
+<script type="text/javascript">
+function wait_until_controlled() {
+  return new Promise(function(resolve) {
+    if (navigator.serviceWorker.controller) {
+      resolve('controlled');
+      return;
+    }
+    navigator.serviceWorker.addEventListener('controllerchange', function onController() {
+      if (navigator.serviceWorker.controller) {
+        navigator.serviceWorker.removeEventListener('controllerchange', onController);
+        resolve('controlled');
+      }
+    });
+  });
+}
+addEventListener('load', async function(event) {
+  window.controlled = wait_until_controlled();
+  window.registration =
+    await navigator.serviceWorker.register('sw_download_canceled.js');
+  let sw = registration.installing || registration.waiting ||
+           registration.active;
+  await waitForState(sw, 'activated');
+  sw.postMessage('claim');
+});
+
+// Place to hold promises for stream closures reported by the SW.
+window.streamClosed = {};
+
+// The ServiceWorker will postMessage to this BroadcastChannel when the streams
+// are closed.  (Alternately, the SW could have used the clients API to post at
+// us, but the mechanism by which that operates would be different when this
+// test is uplifted, and it's desirable to avoid timing changes.)
+//
+// The browser test will use this promise to wait on stream shutdown.
+window.swStreamChannel = new BroadcastChannel("stream-closed");
+function trackStreamClosure(path) {
+  let resolve;
+  const promise = new Promise(r => { resolve = r });
+  window.streamClosed[path] = { promise, resolve };
+}
+window.swStreamChannel.onmessage = ({ data }) => {
+  window.streamClosed[data.what].resolve(data);
+};
+</script>
+
+</body>
+</html>
diff --git a/dom/serviceworkers/test/download_canceled/server-stream-download.sjs b/dom/serviceworkers/test/download_canceled/server-stream-download.sjs
new file mode 100644
index 0000000000..e6ae8c4f98
--- /dev/null
+++ b/dom/serviceworkers/test/download_canceled/server-stream-download.sjs
@@ -0,0 +1,132 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { setInterval, clearInterval } = ChromeUtils.importESModule(
+  "resource://gre/modules/Timer.sys.mjs"
+);
+
+// stolen from file_blocked_script.sjs
+function setGlobalState(data, key) {
+  x = {
+    data,
+    QueryInterface(iid) {
+      return this;
+    },
+  };
+  x.wrappedJSObject = x;
+  setObjectState(key, x);
+}
+
+function getGlobalState(key) {
+  var data;
+  getObjectState(key, function (x) {
+    data = x && x.wrappedJSObject.data;
+  });
+  return data;
+}
+
+/*
+ * We want to let the sw_download_canceled.js service worker know when the
+ * stream was canceled.  To this end, we let it issue a monitor request which we
+ * fulfill when the stream has been canceled.  In order to coordinate between
+ * multiple requests, we use the getObjectState/setObjectState mechanism that
+ * httpd.js exposes to let data be shared and/or persist between requests.  We
+ * handle both possible orderings of the requests because we currently don't
+ * try and impose an ordering between the two requests as issued by the SW, and
+ * file_blocked_script.sjs encourages us to do this, but we probably could order
+ * them.
+ */
+const MONITOR_KEY = "stream-monitor";
+function completeMonitorResponse(response, data) {
+  response.write(JSON.stringify(data));
+  response.finish();
+}
+function handleMonitorRequest(request, response) {
+  response.setHeader("Content-Type", "application/json");
+  response.setStatusLine(request.httpVersion, 200, "Found");
+
+  response.processAsync();
+  // Necessary to cause the headers to be flushed; that or touching the
+  // bodyOutputStream getter.
+  response.write("");
+  dump("server-stream-download.js: monitor headers issued\n");
+
+  const alreadyCompleted = getGlobalState(MONITOR_KEY);
+  if (alreadyCompleted) {
+    completeMonitorResponse(response, alreadyCompleted);
+    setGlobalState(null, MONITOR_KEY);
+  } else {
+    setGlobalState(response, MONITOR_KEY);
+  }
+}
+
+const MAX_TICK_COUNT = 3000;
+const TICK_INTERVAL = 2;
+function handleStreamRequest(request, response) {
+  const name = "server-stream-download";
+
+  // Create some payload to send.
+  let strChunk =
+    "Static routes are the future of ServiceWorkers! So say we all!\n";
+  while (strChunk.length < 1024) {
+    strChunk += strChunk;
+  }
+
+  response.setHeader("Content-Disposition", `attachment; filename="${name}"`);
+  response.setHeader(
+    "Content-Type",
+    `application/octet-stream; name="${name}"`
+  );
+  response.setHeader("Content-Length", `${strChunk.length * MAX_TICK_COUNT}`);
+  response.setStatusLine(request.httpVersion, 200, "Found");
+
+  response.processAsync();
+  response.write(strChunk);
+  dump("server-stream-download.js: stream headers + first payload issued\n");
+
+  let count = 0;
+  let intervalId;
+  function closeStream(why, message) {
+    dump("server-stream-download.js: closing stream: " + why + "\n");
+    clearInterval(intervalId);
+    response.finish();
+
+    const data = { why, message };
+    const monitorResponse = getGlobalState(MONITOR_KEY);
+    if (monitorResponse) {
+      completeMonitorResponse(monitorResponse, data);
+      setGlobalState(null, MONITOR_KEY);
+    } else {
+      setGlobalState(data, MONITOR_KEY);
+    }
+  }
+  function tick() {
+    try {
+      // bound worst-case behavior.
+      if (count++ > MAX_TICK_COUNT) {
+        closeStream("timeout", "timeout");
+        return;
+      }
+      response.write(strChunk);
+    } catch (e) {
+      closeStream("canceled", e.message);
+    }
+  }
+  intervalId = setInterval(tick, TICK_INTERVAL);
+}
+
+function handleRequest(request, response) {
+  dump(
+    "server-stream-download.js: processing request for " +
+      request.path +
+      "?" +
+      request.queryString +
+      "\n"
+  );
+  const query = new URLSearchParams(request.queryString);
+  if (query.has("monitor")) {
+    handleMonitorRequest(request, response);
+  } else {
+    handleStreamRequest(request, response);
+  }
+}
diff --git a/dom/serviceworkers/test/download_canceled/sw_download_canceled.js b/dom/serviceworkers/test/download_canceled/sw_download_canceled.js
new file mode 100644
index 0000000000..cd1d04df22
--- /dev/null
+++ b/dom/serviceworkers/test/download_canceled/sw_download_canceled.js
@@ -0,0 +1,151 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This file is derived from :bkelly's https://glitch.com/edit/#!/html-sw-stream
+
+addEventListener("install", evt => {
+  evt.waitUntil(self.skipWaiting());
+});
+
+// Create a BroadcastChannel to notify when we have closed our streams.
+const channel = new BroadcastChannel("stream-closed");
+
+const MAX_TICK_COUNT = 3000;
+const TICK_INTERVAL = 4;
+/**
+ * Generate a continuous stream of data at a sufficiently high frequency that a
+ * there"s a good chance of racing channel cancellation.
+ */
+function handleStream(evt, filename) {
+  // Create some payload to send.
+  const encoder = new TextEncoder();
+  let strChunk =
+    "Static routes are the future of ServiceWorkers! So say we all!\n";
+  while (strChunk.length < 1024) {
+    strChunk += strChunk;
+  }
+  const dataChunk = encoder.encode(strChunk);
+
+  evt.waitUntil(
+    new Promise(resolve => {
+      let body = new ReadableStream({
+        start: controller => {
+          const closeStream = why => {
+            console.log("closing stream: " + JSON.stringify(why) + "\n");
+            clearInterval(intervalId);
+            resolve();
+            // In event of error, the controller will automatically have closed.
+            if (why.why != "canceled") {
+              try {
+                controller.close();
+              } catch (ex) {
+                // If we thought we should cancel but experienced a problem,
+                // that's a different kind of failure and we need to report it.
+                // (If we didn't catch the exception here, we'd end up erroneously
+                // in the tick() method's canceled handler.)
+                channel.postMessage({
+                  what: filename,
+                  why: "close-failure",
+                  message: ex.message,
+                  ticks: why.ticks,
+                });
+                return;
+              }
+            }
+            // Post prior to performing any attempt to close...
+            channel.postMessage(why);
+          };
+
+          controller.enqueue(dataChunk);
+          let count = 0;
+          let intervalId;
+          function tick() {
+            try {
+              // bound worst-case behavior.
+              if (count++ > MAX_TICK_COUNT) {
+                closeStream({
+                  what: filename,
+                  why: "timeout",
+                  message: "timeout",
+                  ticks: count,
+                });
+                return;
+              }
+              controller.enqueue(dataChunk);
+            } catch (e) {
+              closeStream({
+                what: filename,
+                why: "canceled",
+                message: e.message,
+                ticks: count,
+              });
+            }
+          }
+          // Alternately, streams' pull mechanism could be used here, but this
+          // test doesn't so much want to saturate the stream as to make sure the
+          // data is at least flowing a little bit.  (Also, the author had some
+          // concern about slowing down the test by overwhelming the event loop
+          // and concern that we might not have sufficent back-pressure plumbed
+          // through and an infinite pipe might make bad things happen.)
+          intervalId = setInterval(tick, TICK_INTERVAL);
+          tick();
+        },
+      });
+      evt.respondWith(
+        new Response(body, {
+          headers: {
+            "Content-Disposition": `attachment; filename="${filename}"`,
+            "Content-Type": "application/octet-stream",
+          },
+        })
+      );
+    })
+  );
+}
+
+/**
+ * Use an .sjs to generate a similar stream of data to the above, passing the
+ * response through directly.  Because we're handing off the response but also
+ * want to be able to report when cancellation occurs, we create a second,
+ * overlapping long-poll style fetch that will not finish resolving until the
+ * .sjs experiences closure of its socket and terminates the payload stream.
+ */
+function handlePassThrough(evt, filename) {
+  evt.waitUntil(
+    (async () => {
+      console.log("issuing monitor fetch request");
+      const response = await fetch("server-stream-download.sjs?monitor");
+      console.log("monitor headers received, awaiting body");
+      const data = await response.json();
+      console.log("passthrough monitor fetch completed, notifying.");
+      channel.postMessage({
+        what: filename,
+        why: data.why,
+        message: data.message,
+      });
+    })()
+  );
+  evt.respondWith(
+    fetch("server-stream-download.sjs").then(response => {
+      console.log("server-stream-download.sjs Response received, propagating");
+      return response;
+    })
+  );
+}
+
+addEventListener("fetch", evt => {
+  console.log(`SW processing fetch of ${evt.request.url}`);
+  if (evt.request.url.includes("sw-stream-download")) {
+    handleStream(evt, "sw-stream-download");
+    return;
+  }
+  if (evt.request.url.includes("sw-passthrough-download")) {
+    handlePassThrough(evt, "sw-passthrough-download");
+  }
+});
+
+addEventListener("message", evt => {
+  if (evt.data === "claim") {
+    evt.waitUntil(clients.claim());
+  }
+});
diff --git a/dom/serviceworkers/test/empty.html b/dom/serviceworkers/test/empty.html
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/empty.html
diff --git a/dom/serviceworkers/test/empty.js b/dom/serviceworkers/test/empty.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/empty.js
diff --git a/dom/serviceworkers/test/empty_with_utils.html b/dom/serviceworkers/test/empty_with_utils.html
new file mode 100644
index 0000000000..75f0aa8872
--- /dev/null
+++ b/dom/serviceworkers/test/empty_with_utils.html
@@ -0,0 +1,13 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="utils.js" type="text/javascript"></script>
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/error_reporting_helpers.js b/dom/serviceworkers/test/error_reporting_helpers.js
new file mode 100644
index 0000000000..42ddbe42a2
--- /dev/null
+++ b/dom/serviceworkers/test/error_reporting_helpers.js
@@ -0,0 +1,73 @@
+"use strict";
+
+/**
+ * Helpers for use in tests that want to verify that localized error messages
+ * are logged during the test.  Because most of our errors (ex:
+ * ServiceWorkerManager) generate nsIScriptError instances with flattened
+ * strings (the interpolated arguments aren't kept around), we load the string
+ * bundle and use it to derive the exact string message we expect for the given
+ * payload.
+ **/
+
+let stringBundleService = SpecialPowers.Cc[
+  "@mozilla.org/intl/stringbundle;1"
+].getService(SpecialPowers.Ci.nsIStringBundleService);
+let localizer = stringBundleService.createBundle(
+  "chrome://global/locale/dom/dom.properties"
+);
+
+/**
+ * Start monitoring the console for the given localized error message string(s)
+ * with the given arguments to be logged.  Call before running code that will
+ * generate the console message.  Pair with a call to
+ * `wait_for_expected_message` invoked after the message should have been
+ * generated.
+ *
+ * Multiple error messages can be expected, just repeat the msgId and args
+ * argument pair as needed.
+ *
+ * @param {String} msgId
+ *   The localization message identifier used in the properties file.
+ * @param {String[]} args
+ *   The list of formatting arguments we expect the error to be generated with.
+ * @return {Object} Promise/handle to pass to wait_for_expected_message.
+ */
+function expect_console_message(/* msgId, args, ... */) {
+  let expectations = [];
+  // process repeated paired arguments of: msgId, args
+  for (let i = 0; i < arguments.length; i += 2) {
+    let msgId = arguments[i];
+    let args = arguments[i + 1];
+    if (args.length === 0) {
+      expectations.push({ errorMessage: localizer.GetStringFromName(msgId) });
+    } else {
+      expectations.push({
+        errorMessage: localizer.formatStringFromName(msgId, args),
+      });
+    }
+  }
+  return new Promise(resolve => {
+    SimpleTest.monitorConsole(resolve, expectations);
+  });
+}
+let expect_console_messages = expect_console_message;
+
+/**
+ * Stop monitoring the console, returning a Promise that will be resolved when
+ * the sentinel console message sent through the async data path has been
+ * received.  The Promise will not reject on failure; instead a mochitest
+ * failure will have been generated by ok(false)/equivalent by the time it is
+ * resolved.
+ */
+function wait_for_expected_message(expectedPromise) {
+  SimpleTest.endMonitorConsole();
+  return expectedPromise;
+}
+
+/**
+ * Derive an absolute URL string from a relative URL to simplify error message
+ * argument generation.
+ */
+function make_absolute_url(relUrl) {
+  return new URL(relUrl, window.location).href;
+}
diff --git a/dom/serviceworkers/test/eval_worker.js b/dom/serviceworkers/test/eval_worker.js
new file mode 100644
index 0000000000..b79db5c5be
--- /dev/null
+++ b/dom/serviceworkers/test/eval_worker.js
@@ -0,0 +1,2 @@
+// eslint-disable-next-line no-eval
+eval("1+1");
diff --git a/dom/serviceworkers/test/eventsource/eventsource.resource b/dom/serviceworkers/test/eventsource/eventsource.resource
new file mode 100644
index 0000000000..eb62cbd4c5
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource.resource
@@ -0,0 +1,22 @@
+:this file must be enconded in utf8
+:and its Content-Type must be equal to text/event-stream
+
+retry:500
+data: 2
+unknow: unknow
+
+event: other_event_name
+retry:500
+data: 2
+unknow: unknow
+
+event: click
+retry:500
+
+event: blur
+retry:500
+
+event:keypress
+retry:500
+
+
diff --git a/dom/serviceworkers/test/eventsource/eventsource.resource^headers^ b/dom/serviceworkers/test/eventsource/eventsource.resource^headers^
new file mode 100644
index 0000000000..5b88be7c32
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource.resource^headers^
@@ -0,0 +1,3 @@
+Content-Type: text/event-stream
+Cache-Control: no-cache, must-revalidate
+Access-Control-Allow-Origin: *
diff --git a/dom/serviceworkers/test/eventsource/eventsource_cors_response.html b/dom/serviceworkers/test/eventsource/eventsource_cors_response.html
new file mode 100644
index 0000000000..115a0f5c65
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_cors_response.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script type="text/javascript">
+
+  var prefix = "http://mochi.test:8888/tests/dom/serviceworkers/test/eventsource/";
+
+  function ok(aCondition, aMessage) {
+    parent.postMessage({status: "callback", data: "ok", condition: aCondition, message: aMessage}, "*");
+  }
+
+  function doUnregister() {
+    navigator.serviceWorker.getRegistration().then(swr => {
+      swr.unregister().then(function(result) {
+        ok(result, "Unregister should return true.");
+        parent.postMessage({status: "callback", data: "done"}, "*");
+      }, function(e) {
+        ok(false, "Unregistering the SW failed with " + e);
+      });
+    });
+  }
+
+  function doEventSource() {
+    var source = new EventSource(prefix + "eventsource.resource");
+    source.onmessage = function(e) {
+      source.onmessage = null;
+      source.close();
+      ok(true, "EventSource should work with cors responses");
+      doUnregister();
+    };
+    source.onerror = function(error) {
+      source.onerror = null;
+      source.close();
+      ok(false, "Something went wrong");
+    };
+  }
+
+  function onLoad() {
+    if (!parent) {
+      dump("eventsource/eventsource_cors_response.html shouldn't be launched directly!");
+    }
+
+    window.addEventListener("message", function onMessage(e) {
+      if (e.data.status === "callback") {
+        switch(e.data.data) {
+          case "eventsource":
+            doEventSource();
+            window.removeEventListener("message", onMessage);
+            break;
+          default:
+            ok(false, "Something went wrong")
+            break
+        }
+      }
+    });
+
+    navigator.serviceWorker.ready.then(function() {
+      parent.postMessage({status: "callback", data: "ready"}, "*");
+    });
+
+    navigator.serviceWorker.addEventListener("message", function(event) {
+      parent.postMessage(event.data, "*");
+    });
+  }
+
+  </script>
+</head>
+<body onload="onLoad()">
+</body>
+</html>
diff --git a/dom/serviceworkers/test/eventsource/eventsource_cors_response_intercept_worker.js b/dom/serviceworkers/test/eventsource/eventsource_cors_response_intercept_worker.js
new file mode 100644
index 0000000000..c2e5d416e7
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_cors_response_intercept_worker.js
@@ -0,0 +1,30 @@
+// Cross origin request
+var prefix = "http://example.com/tests/dom/serviceworkers/test/eventsource/";
+
+self.importScripts("eventsource_worker_helper.js");
+
+self.addEventListener("fetch", function (event) {
+  var request = event.request;
+  var url = new URL(request.url);
+
+  if (
+    url.pathname !==
+    "/tests/dom/serviceworkers/test/eventsource/eventsource.resource"
+  ) {
+    return;
+  }
+
+  ok(request.mode === "cors", "EventSource should make a CORS request");
+  ok(
+    request.cache === "no-store",
+    "EventSource should make a no-store request"
+  );
+  var fetchRequest = new Request(prefix + "eventsource.resource", {
+    mode: "cors",
+  });
+  event.respondWith(
+    fetch(fetchRequest).then(fetchResponse => {
+      return fetchResponse;
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response.html b/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response.html
new file mode 100644
index 0000000000..970cae517f
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script type="text/javascript">
+
+  var prefix = "https://example.com/tests/dom/serviceworkers/test/eventsource/";
+
+  function ok(aCondition, aMessage) {
+    parent.postMessage({status: "callback", data: "ok", condition: aCondition, message: aMessage}, "*");
+  }
+
+  function doUnregister() {
+    navigator.serviceWorker.getRegistration().then(swr => {
+      swr.unregister().then(function(result) {
+        ok(result, "Unregister should return true.");
+        parent.postMessage({status: "callback", data: "done"}, "*");
+      }, function(e) {
+        ok(false, "Unregistering the SW failed with " + e);
+      });
+    });
+  }
+
+  function doEventSource() {
+    var source = new EventSource(prefix + "eventsource.resource");
+    source.onmessage = function(e) {
+      source.onmessage = null;
+      source.close();
+      ok(false, "Something went wrong");
+    };
+    source.onerror = function(error) {
+      source.onerror = null;
+      source.close();
+      ok(true, "EventSource should not work with mixed content cors responses");
+      doUnregister();
+    };
+  }
+
+  function onLoad() {
+    if (!parent) {
+      dump("eventsource/eventsource_cors_response.html shouldn't be launched directly!");
+    }
+
+    window.addEventListener("message", function onMessage(e) {
+      if (e.data.status === "callback") {
+        switch(e.data.data) {
+          case "eventsource":
+            doEventSource();
+            window.removeEventListener("message", onMessage);
+            break;
+          default:
+            ok(false, "Something went wrong")
+            break
+        }
+      }
+    });
+
+    navigator.serviceWorker.ready.then(function() {
+      parent.postMessage({status: "callback", data: "ready"}, "*");
+    });
+
+    navigator.serviceWorker.addEventListener("message", function(event) {
+      parent.postMessage(event.data, "*");
+    });
+  }
+
+  </script>
+</head>
+<body onload="onLoad()">
+</body>
+</html>
diff --git a/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response_intercept_worker.js b/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response_intercept_worker.js
new file mode 100644
index 0000000000..9cb8d2d61f
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_mixed_content_cors_response_intercept_worker.js
@@ -0,0 +1,29 @@
+var prefix = "http://example.com/tests/dom/serviceworkers/test/eventsource/";
+
+self.importScripts("eventsource_worker_helper.js");
+
+self.addEventListener("fetch", function (event) {
+  var request = event.request;
+  var url = new URL(request.url);
+
+  if (
+    url.pathname !==
+    "/tests/dom/serviceworkers/test/eventsource/eventsource.resource"
+  ) {
+    return;
+  }
+
+  ok(request.mode === "cors", "EventSource should make a CORS request");
+  ok(
+    request.cache === "no-store",
+    "EventSource should make a no-store request"
+  );
+  var fetchRequest = new Request(prefix + "eventsource.resource", {
+    mode: "cors",
+  });
+  event.respondWith(
+    fetch(fetchRequest).then(fetchResponse => {
+      return fetchResponse;
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/eventsource/eventsource_opaque_response.html b/dom/serviceworkers/test/eventsource/eventsource_opaque_response.html
new file mode 100644
index 0000000000..bce12259cc
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_opaque_response.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script type="text/javascript">
+
+  var prefix = "http://mochi.test:8888/tests/dom/serviceworkers/test/eventsource/";
+
+  function ok(aCondition, aMessage) {
+    parent.postMessage({status: "callback", data: "ok", condition: aCondition, message: aMessage}, "*");
+  }
+
+  function doUnregister() {
+    navigator.serviceWorker.getRegistration().then(swr => {
+      swr.unregister().then(function(result) {
+        ok(result, "Unregister should return true.");
+        parent.postMessage({status: "callback", data: "done"}, "*");
+      }, function(e) {
+        ok(false, "Unregistering the SW failed with " + e);
+      });
+    });
+  }
+
+  function doEventSource() {
+    var source = new EventSource(prefix + "eventsource.resource");
+    source.onmessage = function(e) {
+      source.onmessage = null;
+      source.close();
+      ok(false, "Something went wrong");
+    };
+    source.onerror = function(error) {
+      source.onerror = null;
+      source.close();
+      ok(true, "EventSource should not work with opaque responses");
+      doUnregister();
+    };
+  }
+
+  function onLoad() {
+    if (!parent) {
+      dump("eventsource/eventsource_opaque_response.html shouldn't be launched directly!");
+    }
+
+    window.addEventListener("message", function onMessage(e) {
+      if (e.data.status === "callback") {
+        switch(e.data.data) {
+          case "eventsource":
+            doEventSource();
+            window.removeEventListener("message", onMessage);
+            break;
+          default:
+            ok(false, "Something went wrong")
+            break
+        }
+      }
+    });
+
+    navigator.serviceWorker.ready.then(function() {
+      parent.postMessage({status: "callback", data: "ready"}, "*");
+    });
+
+    navigator.serviceWorker.addEventListener("message", function(event) {
+      parent.postMessage(event.data, "*");
+    });
+  }
+
+  </script>
+</head>
+<body onload="onLoad()">
+</body>
+</html>
diff --git a/dom/serviceworkers/test/eventsource/eventsource_opaque_response_intercept_worker.js b/dom/serviceworkers/test/eventsource/eventsource_opaque_response_intercept_worker.js
new file mode 100644
index 0000000000..5c8c75a161
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_opaque_response_intercept_worker.js
@@ -0,0 +1,30 @@
+// Cross origin request
+var prefix = "http://example.com/tests/dom/serviceworkers/test/eventsource/";
+
+self.importScripts("eventsource_worker_helper.js");
+
+self.addEventListener("fetch", function (event) {
+  var request = event.request;
+  var url = new URL(request.url);
+
+  if (
+    url.pathname !==
+    "/tests/dom/serviceworkers/test/eventsource/eventsource.resource"
+  ) {
+    return;
+  }
+
+  ok(request.mode === "cors", "EventSource should make a CORS request");
+  ok(
+    request.cache === "no-store",
+    "EventSource should make a no-store request"
+  );
+  var fetchRequest = new Request(prefix + "eventsource.resource", {
+    mode: "no-cors",
+  });
+  event.respondWith(
+    fetch(fetchRequest).then(fetchResponse => {
+      return fetchResponse;
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/eventsource/eventsource_register_worker.html b/dom/serviceworkers/test/eventsource/eventsource_register_worker.html
new file mode 100644
index 0000000000..59e8e92ab6
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_register_worker.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script type="text/javascript">
+
+  function getURLParam (aTarget, aValue) {
+    return decodeURI(aTarget.search.replace(new RegExp("^(?:.*[&\\?]" + encodeURI(aValue).replace(/[\.\+\*]/g, "\\$&") + "(?:\\=([^&]*))?)?.*$", "i"), "$1"));
+  }
+
+  function onLoad() {
+    navigator.serviceWorker.ready.then(function() {
+      parent.postMessage({status: "callback", data: "done"}, "*");
+    });
+
+    navigator.serviceWorker.register(getURLParam(document.location, "script"), {scope: "."});
+  }
+
+  </script>
+</head>
+<body onload="onLoad()">
+</body>
+</html>
diff --git a/dom/serviceworkers/test/eventsource/eventsource_synthetic_response.html b/dom/serviceworkers/test/eventsource/eventsource_synthetic_response.html
new file mode 100644
index 0000000000..7f6228c91e
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_synthetic_response.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script type="text/javascript">
+
+  var prefix = "http://mochi.test:8888/tests/dom/serviceworkers/test/eventsource/";
+
+  function ok(aCondition, aMessage) {
+    parent.postMessage({status: "callback", data: "ok", condition: aCondition, message: aMessage}, "*");
+  }
+
+  function doUnregister() {
+    navigator.serviceWorker.getRegistration().then(swr => {
+      swr.unregister().then(function(result) {
+        ok(result, "Unregister should return true.");
+        parent.postMessage({status: "callback", data: "done"}, "*");
+      }, function(e) {
+        ok(false, "Unregistering the SW failed with " + e);
+      });
+    });
+  }
+
+  function doEventSource() {
+    var source = new EventSource(prefix + "eventsource.resource");
+    source.onmessage = function(e) {
+      source.onmessage = null;
+      source.close();
+      ok(true, "EventSource should work with synthetic responses");
+      doUnregister();
+    };
+    source.onerror = function(error) {
+      source.onmessage = null;
+      source.close();
+      ok(false, "Something went wrong");
+    };
+  }
+
+  function onLoad() {
+    if (!parent) {
+      dump("eventsource/eventsource_synthetic_response.html shouldn't be launched directly!");
+    }
+
+    window.addEventListener("message", function onMessage(e) {
+      if (e.data.status === "callback") {
+        switch(e.data.data) {
+          case "eventsource":
+            doEventSource();
+            window.removeEventListener("message", onMessage);
+            break;
+          default:
+            ok(false, "Something went wrong")
+            break
+        }
+      }
+    });
+
+    navigator.serviceWorker.ready.then(function() {
+      parent.postMessage({status: "callback", data: "ready"}, "*");
+    });
+
+    navigator.serviceWorker.addEventListener("message", function(event) {
+      parent.postMessage(event.data, "*");
+    });
+  }
+
+  </script>
+</head>
+<body onload="onLoad()">
+</body>
+</html>
diff --git a/dom/serviceworkers/test/eventsource/eventsource_synthetic_response_intercept_worker.js b/dom/serviceworkers/test/eventsource/eventsource_synthetic_response_intercept_worker.js
new file mode 100644
index 0000000000..72780e2979
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_synthetic_response_intercept_worker.js
@@ -0,0 +1,27 @@
+self.importScripts("eventsource_worker_helper.js");
+
+self.addEventListener("fetch", function (event) {
+  var request = event.request;
+  var url = new URL(request.url);
+
+  if (
+    url.pathname !==
+    "/tests/dom/serviceworkers/test/eventsource/eventsource.resource"
+  ) {
+    return;
+  }
+
+  ok(request.mode === "cors", "EventSource should make a CORS request");
+  var headerList = {
+    "Content-Type": "text/event-stream",
+    "Cache-Control": "no-cache, must-revalidate",
+  };
+  var headers = new Headers(headerList);
+  var init = {
+    headers,
+    mode: "cors",
+  };
+  var body = "data: data0\r\r";
+  var response = new Response(body, init);
+  event.respondWith(response);
+});
diff --git a/dom/serviceworkers/test/eventsource/eventsource_worker_helper.js b/dom/serviceworkers/test/eventsource/eventsource_worker_helper.js
new file mode 100644
index 0000000000..676d2a4bbe
--- /dev/null
+++ b/dom/serviceworkers/test/eventsource/eventsource_worker_helper.js
@@ -0,0 +1,17 @@
+function ok(aCondition, aMessage) {
+  return new Promise(function (resolve, reject) {
+    self.clients.matchAll().then(function (res) {
+      if (!res.length) {
+        reject();
+        return;
+      }
+      res[0].postMessage({
+        status: "callback",
+        data: "ok",
+        condition: aCondition,
+        message: aMessage,
+      });
+      resolve();
+    });
+  });
+}
diff --git a/dom/serviceworkers/test/fetch.js b/dom/serviceworkers/test/fetch.js
new file mode 100644
index 0000000000..bf1bb4acb3
--- /dev/null
+++ b/dom/serviceworkers/test/fetch.js
@@ -0,0 +1,33 @@
+function get_query_params(url) {
+  var search = new URL(url).search;
+  if (!search) {
+    return {};
+  }
+  var ret = {};
+  var params = search.substring(1).split("&");
+  params.forEach(function (param) {
+    var element = param.split("=");
+    ret[decodeURIComponent(element[0])] = decodeURIComponent(element[1]);
+  });
+  return ret;
+}
+
+addEventListener("fetch", function (event) {
+  if (event.request.url.includes("fail.html")) {
+    event.respondWith(fetch("hello.html", { integrity: "abc" }));
+  } else if (event.request.url.includes("fake.html")) {
+    event.respondWith(fetch("hello.html"));
+  } else if (event.request.url.includes("file_js_cache")) {
+    event.respondWith(fetch(event.request));
+  } else if (event.request.url.includes("redirect")) {
+    let param = get_query_params(event.request.url);
+    let url = param.url;
+    let mode = param.mode;
+
+    event.respondWith(fetch(url, { mode }));
+  }
+});
+
+addEventListener("activate", function (event) {
+  event.waitUntil(clients.claim());
+});
diff --git a/dom/serviceworkers/test/fetch/cookie/cookie_test.js b/dom/serviceworkers/test/fetch/cookie/cookie_test.js
new file mode 100644
index 0000000000..4102b4b341
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/cookie/cookie_test.js
@@ -0,0 +1,11 @@
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("synth.html")) {
+    var body =
+      "<script>" +
+      'window.parent.postMessage({status: "done", cookie: document.cookie}, "*");' +
+      "</script>";
+    event.respondWith(
+      new Response(body, { headers: { "Content-Type": "text/html" } })
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/cookie/register.html b/dom/serviceworkers/test/fetch/cookie/register.html
new file mode 100644
index 0000000000..99eabaf0a2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/cookie/register.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<script src="../../utils.js"></script>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  document.cookie = "foo=bar";
+
+  navigator.serviceWorker.register("cookie_test.js", {scope: "."})
+                         .then(reg => {
+                           return waitForState(reg.installing, "activated", reg);
+                         }).then(done);
+</script>
diff --git a/dom/serviceworkers/test/fetch/cookie/unregister.html b/dom/serviceworkers/test/fetch/cookie/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/cookie/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/deliver-gzip.sjs b/dom/serviceworkers/test/fetch/deliver-gzip.sjs
new file mode 100644
index 0000000000..2faa09532d
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/deliver-gzip.sjs
@@ -0,0 +1,21 @@
+"use strict";
+
+function handleRequest(request, response) {
+  // The string "hello" repeated 10 times followed by newline. Compressed using gzip.
+  // prettier-ignore
+  let bytes = [0x1f, 0x8b, 0x08, 0x08, 0x4d, 0xe2, 0xf9, 0x54, 0x00, 0x03, 0x68,
+               0x65, 0x6c, 0x6c, 0x6f, 0x00, 0xcb, 0x48, 0xcd, 0xc9, 0xc9, 0xcf,
+               0x20, 0x85, 0xe0, 0x02, 0x00, 0xf5, 0x4b, 0x38, 0xcf, 0x33, 0x00,
+               0x00, 0x00];
+
+  response.setHeader("Content-Encoding", "gzip", false);
+  response.setHeader("Content-Length", "" + bytes.length, false);
+  response.setHeader("Content-Type", "text/plain", false);
+
+  let bos = Cc["@mozilla.org/binaryoutputstream;1"].createInstance(
+    Ci.nsIBinaryOutputStream
+  );
+  bos.setOutputStream(response.bodyOutputStream);
+
+  bos.writeByteArray(bytes);
+}
diff --git a/dom/serviceworkers/test/fetch/fetch_tests.js b/dom/serviceworkers/test/fetch/fetch_tests.js
new file mode 100644
index 0000000000..69b8a89679
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/fetch_tests.js
@@ -0,0 +1,716 @@
+var origin = "http://mochi.test:8888";
+
+function fetchXHRWithMethod(name, method, onload, onerror, headers) {
+  expectAsyncResult();
+
+  onload =
+    onload ||
+    function () {
+      my_ok(false, "XHR load should not complete successfully");
+      finish();
+    };
+  onerror =
+    onerror ||
+    function () {
+      my_ok(
+        false,
+        "XHR load for " + name + " should be intercepted successfully"
+      );
+      finish();
+    };
+
+  var x = new XMLHttpRequest();
+  x.open(method, name, true);
+  x.onload = function () {
+    onload(x);
+  };
+  x.onerror = function () {
+    onerror(x);
+  };
+  headers = headers || [];
+  headers.forEach(function (header) {
+    x.setRequestHeader(header[0], header[1]);
+  });
+  x.send();
+}
+
+var corsServerPath =
+  "/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs";
+var corsServerURL = "http://example.com" + corsServerPath;
+
+function redirectURL(hops) {
+  return (
+    hops[0].server +
+    corsServerPath +
+    "?hop=1&hops=" +
+    encodeURIComponent(JSON.stringify(hops))
+  );
+}
+
+function fetchXHR(name, onload, onerror, headers) {
+  return fetchXHRWithMethod(name, "GET", onload, onerror, headers);
+}
+
+fetchXHR("bare-synthesized.txt", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "synthesized response body",
+    "load should have synthesized response"
+  );
+  finish();
+});
+
+fetchXHR("test-respondwith-response.txt", function (xhr) {
+  my_ok(
+    xhr.status == 200,
+    "test-respondwith-response load should be successful"
+  );
+  my_ok(
+    xhr.responseText == "test-respondwith-response response body",
+    "load should have response"
+  );
+  finish();
+});
+
+fetchXHR("synthesized-404.txt", function (xhr) {
+  my_ok(xhr.status == 404, "load should 404");
+  my_ok(
+    xhr.responseText == "synthesized response body",
+    "404 load should have synthesized response"
+  );
+  finish();
+});
+
+fetchXHR("synthesized-headers.txt", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.getResponseHeader("X-Custom-Greeting") === "Hello",
+    "custom header should be set"
+  );
+  my_ok(
+    xhr.responseText == "synthesized response body",
+    "custom header load should have synthesized response"
+  );
+  finish();
+});
+
+fetchXHR("synthesized-redirect-real-file.txt", function (xhr) {
+  dump("Got status AARRGH " + xhr.status + " " + xhr.responseText + "\n");
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "This is a real file.\n",
+    "Redirect to real file should complete."
+  );
+  finish();
+});
+
+fetchXHR("synthesized-redirect-twice-real-file.txt", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "This is a real file.\n",
+    "Redirect to real file (twice) should complete."
+  );
+  finish();
+});
+
+fetchXHR("synthesized-redirect-synthesized.txt", function (xhr) {
+  my_ok(xhr.status == 200, "synth+redirect+synth load should be successful");
+  my_ok(
+    xhr.responseText == "synthesized response body",
+    "load should have redirected+synthesized response"
+  );
+  finish();
+});
+
+fetchXHR("synthesized-redirect-twice-synthesized.txt", function (xhr) {
+  my_ok(
+    xhr.status == 200,
+    "synth+redirect+synth (twice) load should be successful"
+  );
+  my_ok(
+    xhr.responseText == "synthesized response body",
+    "load should have redirected+synthesized (twice) response"
+  );
+  finish();
+});
+
+fetchXHR("redirect.sjs", function (xhr) {
+  my_ok(xhr.status == 404, "redirected load should be uninterrupted");
+  finish();
+});
+
+fetchXHR("ignored.txt", function (xhr) {
+  my_ok(xhr.status == 404, "load should be uninterrupted");
+  finish();
+});
+
+fetchXHR("rejected.txt", null, function (xhr) {
+  my_ok(xhr.status == 0, "load should not complete");
+  finish();
+});
+
+fetchXHR("nonresponse.txt", null, function (xhr) {
+  my_ok(xhr.status == 0, "load should not complete");
+  finish();
+});
+
+fetchXHR("nonresponse2.txt", null, function (xhr) {
+  my_ok(xhr.status == 0, "load should not complete");
+  finish();
+});
+
+fetchXHR("nonpromise.txt", null, function (xhr) {
+  my_ok(xhr.status == 0, "load should not complete");
+  finish();
+});
+
+fetchXHR(
+  "headers.txt",
+  function (xhr) {
+    my_ok(xhr.status == 200, "load should be successful");
+    my_ok(xhr.responseText == "1", "request header checks should have passed");
+    finish();
+  },
+  null,
+  [
+    ["X-Test1", "header1"],
+    ["X-Test2", "header2"],
+  ]
+);
+
+fetchXHR("http://user:pass@mochi.test:8888/user-pass", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "http://user:pass@mochi.test:8888/user-pass",
+    "The username and password should be preserved"
+  );
+  finish();
+});
+
+fetchXHR("readable-stream.txt", function (xhr) {
+  my_ok(xhr.status == 200, "loading completed");
+  my_ok(xhr.responseText == "Hello!", "The message is correct!");
+  finish();
+});
+
+fetchXHR(
+  "readable-stream-locked.txt",
+  function (xhr) {
+    my_ok(false, "This should not be called!");
+    finish();
+  },
+  function () {
+    my_ok(true, "The exception has been correctly handled!");
+    finish();
+  }
+);
+
+fetchXHR(
+  "readable-stream-with-exception.txt",
+  function (xhr) {
+    my_ok(false, "This should not be called!");
+    finish();
+  },
+  function () {
+    my_ok(true, "The exception has been correctly handled!");
+    finish();
+  }
+);
+
+fetchXHR(
+  "readable-stream-with-exception2.txt",
+  function (xhr) {
+    my_ok(false, "This should not be called!");
+    finish();
+  },
+  function () {
+    my_ok(true, "The exception has been correctly handled!");
+    finish();
+  }
+);
+
+fetchXHR(
+  "readable-stream-already-consumed.txt",
+  function (xhr) {
+    my_ok(false, "This should not be called!");
+    finish();
+  },
+  function () {
+    my_ok(true, "The exception has been correctly handled!");
+    finish();
+  }
+);
+
+var expectedUncompressedResponse = "";
+for (let i = 0; i < 10; ++i) {
+  expectedUncompressedResponse += "hello";
+}
+expectedUncompressedResponse += "\n";
+
+// ServiceWorker does not intercept, at which point the network request should
+// be correctly decoded.
+fetchXHR("deliver-gzip.sjs", function (xhr) {
+  my_ok(xhr.status == 200, "network gzip load should be successful");
+  my_ok(
+    xhr.responseText == expectedUncompressedResponse,
+    "network gzip load should have synthesized response."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Encoding") == "gzip",
+    "network Content-Encoding should be gzip."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Length") == "35",
+    "network Content-Length should be of original gzipped file."
+  );
+  finish();
+});
+
+fetchXHR("hello.gz", function (xhr) {
+  my_ok(xhr.status == 200, "gzip load should be successful");
+  my_ok(
+    xhr.responseText == expectedUncompressedResponse,
+    "gzip load should have synthesized response."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Encoding") == "gzip",
+    "Content-Encoding should be gzip."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Length") == "35",
+    "Content-Length should be of original gzipped file."
+  );
+  finish();
+});
+
+fetchXHR("hello-after-extracting.gz", function (xhr) {
+  my_ok(xhr.status == 200, "gzip load after extracting should be successful");
+  my_ok(
+    xhr.responseText == expectedUncompressedResponse,
+    "gzip load after extracting should have synthesized response."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Encoding") == "gzip",
+    "Content-Encoding after extracting should be gzip."
+  );
+  my_ok(
+    xhr.getResponseHeader("Content-Length") == "35",
+    "Content-Length after extracting should be of original gzipped file."
+  );
+  finish();
+});
+
+fetchXHR(corsServerURL + "?status=200&allowOrigin=*", function (xhr) {
+  my_ok(
+    xhr.status == 200,
+    "cross origin load with correct headers should be successful"
+  );
+  my_ok(
+    xhr.getResponseHeader("access-control-allow-origin") == null,
+    "cors headers should be filtered out"
+  );
+  finish();
+});
+
+// Verify origin header is sent properly even when we have a no-intercept SW.
+var uriOrigin = encodeURIComponent(origin);
+fetchXHR(
+  "http://example.org" +
+    corsServerPath +
+    "?ignore&status=200&origin=" +
+    uriOrigin +
+    "&allowOrigin=" +
+    uriOrigin,
+  function (xhr) {
+    my_ok(
+      xhr.status == 200,
+      "cross origin load with correct headers should be successful"
+    );
+    my_ok(
+      xhr.getResponseHeader("access-control-allow-origin") == null,
+      "cors headers should be filtered out"
+    );
+    finish();
+  }
+);
+
+// Verify that XHR is considered CORS tainted even when original URL is same-origin
+// redirected to cross-origin.
+fetchXHR(
+  redirectURL([
+    { server: origin },
+    { server: "http://example.org", allowOrigin: origin },
+  ]),
+  function (xhr) {
+    my_ok(
+      xhr.status == 200,
+      "cross origin load with correct headers should be successful"
+    );
+    my_ok(
+      xhr.getResponseHeader("access-control-allow-origin") == null,
+      "cors headers should be filtered out"
+    );
+    finish();
+  }
+);
+
+// Test that CORS preflight requests cannot be intercepted. Performs a
+// cross-origin XHR that the SW chooses not to intercept. This requires a
+// preflight request, which the SW must not be allowed to intercept.
+fetchXHR(
+  corsServerURL + "?status=200&allowOrigin=*",
+  null,
+  function (xhr) {
+    my_ok(
+      xhr.status == 0,
+      "cross origin load with incorrect headers should be a failure"
+    );
+    finish();
+  },
+  [["X-Unsafe", "unsafe"]]
+);
+
+// Test that CORS preflight requests cannot be intercepted. Performs a
+// cross-origin XHR that the SW chooses to intercept and respond with a
+// cross-origin fetch. This requires a preflight request, which the SW must not
+// be allowed to intercept.
+fetchXHR(
+  "http://example.org" + corsServerPath + "?status=200&allowOrigin=*",
+  null,
+  function (xhr) {
+    my_ok(
+      xhr.status == 0,
+      "cross origin load with incorrect headers should be a failure"
+    );
+    finish();
+  },
+  [["X-Unsafe", "unsafe"]]
+);
+
+// Test that when the page fetches a url the controlling SW forces a redirect to
+// another location. This other location fetch should also be intercepted by
+// the SW.
+fetchXHR("something.txt", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "something else response body",
+    "load should have something else"
+  );
+  finish();
+});
+
+// Test fetch will internally get it's SkipServiceWorker flag set. The request is
+// made from the SW through fetch(). fetch() fetches a server-side JavaScript
+// file that force a redirect. The redirect location fetch does not go through
+// the SW.
+fetchXHR("redirect_serviceworker.sjs", function (xhr) {
+  my_ok(xhr.status == 200, "load should be successful");
+  my_ok(
+    xhr.responseText == "// empty worker, always succeed!\n",
+    "load should have redirection content"
+  );
+  finish();
+});
+
+fetchXHR(
+  "empty-header",
+  function (xhr) {
+    my_ok(xhr.status == 200, "load should be successful");
+    my_ok(
+      xhr.responseText == "emptyheader",
+      "load should have the expected content"
+    );
+    finish();
+  },
+  null,
+  [["emptyheader", ""]]
+);
+
+expectAsyncResult();
+fetch(
+  "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200&allowOrigin=*"
+).then(
+  function (res) {
+    my_ok(res.ok, "Valid CORS request should receive valid response");
+    my_ok(res.type == "cors", "Response type should be CORS");
+    res.text().then(function (body) {
+      my_ok(
+        body === "<res>hello pass</res>\n",
+        "cors response body should match"
+      );
+      finish();
+    });
+  },
+  function (e) {
+    my_ok(false, "CORS Fetch failed");
+    finish();
+  }
+);
+
+expectAsyncResult();
+fetch(
+  "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200",
+  { mode: "no-cors" }
+).then(
+  function (res) {
+    my_ok(res.type == "opaque", "Response type should be opaque");
+    my_ok(res.status == 0, "Status should be 0");
+    res.text().then(function (body) {
+      my_ok(body === "", "opaque response body should be empty");
+      finish();
+    });
+  },
+  function (e) {
+    my_ok(false, "no-cors Fetch failed");
+    finish();
+  }
+);
+
+expectAsyncResult();
+fetch("opaque-on-same-origin").then(
+  function (res) {
+    my_ok(
+      false,
+      "intercepted opaque response for non no-cors request should fail."
+    );
+    finish();
+  },
+  function (e) {
+    my_ok(
+      true,
+      "intercepted opaque response for non no-cors request should fail."
+    );
+    finish();
+  }
+);
+
+expectAsyncResult();
+fetch("http://example.com/opaque-no-cors", { mode: "no-cors" }).then(
+  function (res) {
+    my_ok(
+      res.type == "opaque",
+      "intercepted opaque response for no-cors request should have type opaque."
+    );
+    finish();
+  },
+  function (e) {
+    my_ok(
+      false,
+      "intercepted opaque response for no-cors request should pass."
+    );
+    finish();
+  }
+);
+
+expectAsyncResult();
+fetch("http://example.com/cors-for-no-cors", { mode: "no-cors" }).then(
+  function (res) {
+    my_ok(
+      res.type == "cors",
+      "synthesize CORS response should result in outer CORS response"
+    );
+    finish();
+  },
+  function (e) {
+    my_ok(false, "cors-for-no-cors request should not reject");
+    finish();
+  }
+);
+
+function arrayBufferFromString(str) {
+  var arr = new Uint8Array(str.length);
+  for (let i = 0; i < str.length; ++i) {
+    arr[i] = str.charCodeAt(i);
+  }
+  return arr;
+}
+
+expectAsyncResult();
+fetch(new Request("body-simple", { method: "POST", body: "my body" }))
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body == "my bodymy body",
+      "the body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+fetch(
+  new Request("body-arraybufferview", {
+    method: "POST",
+    body: arrayBufferFromString("my body"),
+  })
+)
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body == "my bodymy body",
+      "the ArrayBufferView body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+fetch(
+  new Request("body-arraybuffer", {
+    method: "POST",
+    body: arrayBufferFromString("my body").buffer,
+  })
+)
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body == "my bodymy body",
+      "the ArrayBuffer body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+var usp = new URLSearchParams();
+usp.set("foo", "bar");
+usp.set("baz", "qux");
+fetch(new Request("body-urlsearchparams", { method: "POST", body: usp }))
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body == "foo=bar&baz=quxfoo=bar&baz=qux",
+      "the URLSearchParams body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+var fd = new FormData();
+fd.set("foo", "bar");
+fd.set("baz", "qux");
+fetch(new Request("body-formdata", { method: "POST", body: fd }))
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body.indexOf('Content-Disposition: form-data; name="foo"\r\n\r\nbar') <
+        body.indexOf('Content-Disposition: form-data; name="baz"\r\n\r\nqux'),
+      "the FormData body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+fetch(
+  new Request("body-blob", {
+    method: "POST",
+    body: new Blob(new String("my body")),
+  })
+)
+  .then(function (res) {
+    return res.text();
+  })
+  .then(function (body) {
+    my_ok(
+      body == "my bodymy body",
+      "the Blob body of the intercepted fetch should be visible in the SW"
+    );
+    finish();
+  });
+
+expectAsyncResult();
+fetch("interrupt.sjs").then(
+  function (res) {
+    my_ok(true, "interrupted fetch succeeded");
+    res.text().then(
+      function (body) {
+        my_ok(false, "interrupted fetch shouldn't have complete body");
+        finish();
+      },
+      function () {
+        my_ok(true, "interrupted fetch shouldn't have complete body");
+        finish();
+      }
+    );
+  },
+  function (e) {
+    my_ok(false, "interrupted fetch failed");
+    finish();
+  }
+);
+
+["DELETE", "GET", "HEAD", "OPTIONS", "POST", "PUT"].forEach(function (method) {
+  fetchXHRWithMethod("xhr-method-test.txt", method, function (xhr) {
+    my_ok(xhr.status == 200, method + " load should be successful");
+    if (method === "HEAD") {
+      my_ok(
+        xhr.responseText == "",
+        method + "load should not have synthesized response"
+      );
+    } else {
+      my_ok(
+        xhr.responseText == "intercepted " + method,
+        method + " load should have synthesized response"
+      );
+    }
+    finish();
+  });
+});
+
+expectAsyncResult();
+fetch(new Request("empty-header", { headers: { emptyheader: "" } }))
+  .then(function (res) {
+    return res.text();
+  })
+  .then(
+    function (body) {
+      my_ok(
+        body == "emptyheader",
+        "The empty header was observed in the fetch event"
+      );
+      finish();
+    },
+    function (err) {
+      my_ok(false, "A promise was rejected with " + err);
+      finish();
+    }
+  );
+
+expectAsyncResult();
+fetch("fetchevent-extendable")
+  .then(function (res) {
+    return res.text();
+  })
+  .then(
+    function (body) {
+      my_ok(body == "extendable", "FetchEvent inherits from ExtendableEvent");
+      finish();
+    },
+    function (err) {
+      my_ok(false, "A promise was rejected with " + err);
+      finish();
+    }
+  );
+
+expectAsyncResult();
+fetch("fetchevent-request")
+  .then(function (res) {
+    return res.text();
+  })
+  .then(
+    function (body) {
+      my_ok(body == "non-nullable", "FetchEvent.request must be non-nullable");
+      finish();
+    },
+    function (err) {
+      my_ok(false, "A promise was rejected with " + err);
+      finish();
+    }
+  );
diff --git a/dom/serviceworkers/test/fetch/fetch_worker_script.js b/dom/serviceworkers/test/fetch/fetch_worker_script.js
new file mode 100644
index 0000000000..6eb0b18a77
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/fetch_worker_script.js
@@ -0,0 +1,28 @@
+function my_ok(v, msg) {
+  postMessage({ type: "ok", value: v, msg });
+}
+
+function finish() {
+  postMessage("finish");
+}
+
+function expectAsyncResult() {
+  postMessage("expect");
+}
+
+expectAsyncResult();
+try {
+  var success = false;
+  importScripts("nonexistent_imported_script.js");
+} catch (x) {}
+
+my_ok(success, "worker imported script should be intercepted");
+finish();
+
+function check_intercepted_script() {
+  success = true;
+}
+
+importScripts("fetch_tests.js");
+
+finish(); //corresponds to the gExpected increment before creating this worker
diff --git a/dom/serviceworkers/test/fetch/hsts/embedder.html b/dom/serviceworkers/test/fetch/hsts/embedder.html
new file mode 100644
index 0000000000..ad44809042
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/embedder.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<script>
+  window.onmessage = function(e) {
+    window.parent.postMessage(e.data, "*");
+  };
+</script>
+<iframe src="http://example.com/tests/dom/serviceworkers/test/fetch/hsts/index.html"></iframe>
diff --git a/dom/serviceworkers/test/fetch/hsts/hsts_test.js b/dom/serviceworkers/test/fetch/hsts/hsts_test.js
new file mode 100644
index 0000000000..74b9ed23ba
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/hsts_test.js
@@ -0,0 +1,11 @@
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    event.respondWith(fetch("realindex.html"));
+  } else if (event.request.url.includes("image-20px.png")) {
+    if (event.request.url.indexOf("https://") == 0) {
+      event.respondWith(fetch("image-40px.png"));
+    } else {
+      event.respondWith(Response.error());
+    }
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/hsts/image-20px.png b/dom/serviceworkers/test/fetch/hsts/image-20px.png
new file mode 100644
index 0000000000..ae6a8a6b88
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/image-20px.png
diff --git a/dom/serviceworkers/test/fetch/hsts/image-40px.png b/dom/serviceworkers/test/fetch/hsts/image-40px.png
new file mode 100644
index 0000000000..fe391dc8a2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/image-40px.png
diff --git a/dom/serviceworkers/test/fetch/hsts/image.html b/dom/serviceworkers/test/fetch/hsts/image.html
new file mode 100644
index 0000000000..7036ea954e
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/image.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<script>
+onload=function(){
+  var img = new Image();
+  img.src = "http://example.com/tests/dom/serviceworkers/test/fetch/hsts/image-20px.png";
+  img.onload = function() {
+    window.parent.postMessage({status: "image", data: img.width}, "*");
+  };
+  img.onerror = function() {
+    window.parent.postMessage({status: "image", data: "error"}, "*");
+  };
+};
+</script>
diff --git a/dom/serviceworkers/test/fetch/hsts/realindex.html b/dom/serviceworkers/test/fetch/hsts/realindex.html
new file mode 100644
index 0000000000..e7d282fe83
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/realindex.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<script>
+  var securityInfoPresent = !!SpecialPowers.wrap(window).docShell.currentDocumentChannel.securityInfo;
+  window.parent.postMessage({status: "protocol",
+                             data: location.protocol,
+                             securityInfoPresent},
+                            "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/hsts/register.html b/dom/serviceworkers/test/fetch/hsts/register.html
new file mode 100644
index 0000000000..bcdc146aec
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("hsts_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/hsts/register.html^headers^ b/dom/serviceworkers/test/fetch/hsts/register.html^headers^
new file mode 100644
index 0000000000..a46bf65bd9
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/register.html^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-cache
+Strict-Transport-Security: max-age=60
diff --git a/dom/serviceworkers/test/fetch/hsts/unregister.html b/dom/serviceworkers/test/fetch/hsts/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/hsts/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/clonedresponse/https_test.js b/dom/serviceworkers/test/fetch/https/clonedresponse/https_test.js
new file mode 100644
index 0000000000..8ab34123af
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/clonedresponse/https_test.js
@@ -0,0 +1,19 @@
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    caches.open("cache").then(function (cache) {
+      return cache.add("index.html");
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    event.respondWith(
+      new Promise(function (resolve, reject) {
+        caches.match(event.request).then(function (response) {
+          resolve(response.clone());
+        });
+      })
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/https/clonedresponse/index.html b/dom/serviceworkers/test/fetch/https/clonedresponse/index.html
new file mode 100644
index 0000000000..a435548443
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/clonedresponse/index.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/clonedresponse/register.html b/dom/serviceworkers/test/fetch/https/clonedresponse/register.html
new file mode 100644
index 0000000000..41774f70d1
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/clonedresponse/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("https_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/clonedresponse/unregister.html b/dom/serviceworkers/test/fetch/https/clonedresponse/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/clonedresponse/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/https_test.js b/dom/serviceworkers/test/fetch/https/https_test.js
new file mode 100644
index 0000000000..5f20690bb5
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/https_test.js
@@ -0,0 +1,31 @@
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    caches.open("cache").then(function (cache) {
+      var synth = new Response(
+        '<!DOCTYPE html><script>window.parent.postMessage({status: "done-synth-sw"}, "*");</script>',
+        { headers: { "Content-Type": "text/html" } }
+      );
+      return Promise.all([
+        cache.add("index.html"),
+        cache.put("synth-sw.html", synth),
+      ]);
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    event.respondWith(caches.match(event.request));
+  } else if (event.request.url.includes("synth-sw.html")) {
+    event.respondWith(caches.match(event.request));
+  } else if (event.request.url.includes("synth-window.html")) {
+    event.respondWith(caches.match(event.request));
+  } else if (event.request.url.includes("synth.html")) {
+    event.respondWith(
+      new Response(
+        '<!DOCTYPE html><script>window.parent.postMessage({status: "done-synth"}, "*");</script>',
+        { headers: { "Content-Type": "text/html" } }
+      )
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/https/index.html b/dom/serviceworkers/test/fetch/https/index.html
new file mode 100644
index 0000000000..a435548443
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/index.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/register.html b/dom/serviceworkers/test/fetch/https/register.html
new file mode 100644
index 0000000000..fa666fe957
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/register.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(reg => {
+    return window.caches.open("cache").then(function(cache) {
+      var synth = new Response('<!DOCTYPE html><script>window.parent.postMessage({status: "done-synth-window"}, "*");</scri' + 'pt>',
+                               {headers:{"Content-Type": "text/html"}});
+      return cache.put('synth-window.html', synth).then(_ => done(reg));
+    });
+  });
+  navigator.serviceWorker.register("https_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/https/unregister.html b/dom/serviceworkers/test/fetch/https/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/https/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/image-20px.png b/dom/serviceworkers/test/fetch/imagecache-maxage/image-20px.png
new file mode 100644
index 0000000000..ae6a8a6b88
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/image-20px.png
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/image-40px.png b/dom/serviceworkers/test/fetch/imagecache-maxage/image-40px.png
new file mode 100644
index 0000000000..fe391dc8a2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/image-40px.png
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/index.html b/dom/serviceworkers/test/fetch/imagecache-maxage/index.html
new file mode 100644
index 0000000000..0d4c52eedd
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/index.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<script>
+var width, url, width2, url2;
+function maybeReport() {
+  if (width !== undefined && url !== undefined &&
+      width2 !== undefined && url2 !== undefined) {
+    window.parent.postMessage({status: "result",
+                               width,
+                               width2,
+                               url,
+                               url2}, "*");
+  }
+}
+onload = function() {
+  width = document.querySelector("img").width;
+  width2 = document.querySelector("img").width;
+  maybeReport();
+};
+navigator.serviceWorker.onmessage = function(event) {
+  if (event.data.suffix == "2") {
+    url2 = event.data.url;
+  } else {
+    url = event.data.url;
+  }
+  maybeReport();
+};
+</script>
+<img src="image.png">
+<img src="image2.png">
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/maxage_test.js b/dom/serviceworkers/test/fetch/imagecache-maxage/maxage_test.js
new file mode 100644
index 0000000000..c664e07c28
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/maxage_test.js
@@ -0,0 +1,45 @@
+function synthesizeImage(suffix) {
+  // Serve image-20px for the first page, and image-40px for the second page.
+  return clients
+    .matchAll()
+    .then(clients => {
+      var url = "image-20px.png";
+      clients.forEach(client => {
+        if (client.url.indexOf("?new") > 0) {
+          url = "image-40px.png";
+        }
+        client.postMessage({ suffix, url });
+      });
+      return fetch(url);
+    })
+    .then(response => {
+      return response.arrayBuffer();
+    })
+    .then(ab => {
+      var headers;
+      if (suffix == "") {
+        headers = {
+          "Content-Type": "image/png",
+          Date: "Tue, 1 Jan 1990 01:02:03 GMT",
+          "Cache-Control": "max-age=1",
+        };
+      } else {
+        headers = {
+          "Content-Type": "image/png",
+          "Cache-Control": "no-cache",
+        };
+      }
+      return new Response(ab, {
+        status: 200,
+        headers,
+      });
+    });
+}
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("image.png")) {
+    event.respondWith(synthesizeImage(""));
+  } else if (event.request.url.includes("image2.png")) {
+    event.respondWith(synthesizeImage("2"));
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/register.html b/dom/serviceworkers/test/fetch/imagecache-maxage/register.html
new file mode 100644
index 0000000000..af4dde2e29
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("maxage_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/imagecache-maxage/unregister.html b/dom/serviceworkers/test/fetch/imagecache-maxage/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache-maxage/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/imagecache/image-20px.png b/dom/serviceworkers/test/fetch/imagecache/image-20px.png
new file mode 100644
index 0000000000..ae6a8a6b88
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/image-20px.png
diff --git a/dom/serviceworkers/test/fetch/imagecache/image-40px.png b/dom/serviceworkers/test/fetch/imagecache/image-40px.png
new file mode 100644
index 0000000000..fe391dc8a2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/image-40px.png
diff --git a/dom/serviceworkers/test/fetch/imagecache/imagecache_test.js b/dom/serviceworkers/test/fetch/imagecache/imagecache_test.js
new file mode 100644
index 0000000000..cd8f522728
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/imagecache_test.js
@@ -0,0 +1,15 @@
+function synthesizeImage() {
+  return clients.matchAll().then(clients => {
+    var url = "image-40px.png";
+    clients.forEach(client => {
+      client.postMessage(url);
+    });
+    return fetch(url);
+  });
+}
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("image-20px.png")) {
+    event.respondWith(synthesizeImage());
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/imagecache/index.html b/dom/serviceworkers/test/fetch/imagecache/index.html
new file mode 100644
index 0000000000..f634f68bb7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/index.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<script>
+var width, url;
+function maybeReport() {
+  if (width !== undefined && url !== undefined) {
+    window.parent.postMessage({status: "result",
+                               width,
+                               url}, "*");
+  }
+}
+onload = function() {
+  width = document.querySelector("img").width;
+  maybeReport();
+};
+navigator.serviceWorker.onmessage = function(event) {
+  url = event.data;
+  maybeReport();
+};
+</script>
+<img src="image-20px.png">
diff --git a/dom/serviceworkers/test/fetch/imagecache/postmortem.html b/dom/serviceworkers/test/fetch/imagecache/postmortem.html
new file mode 100644
index 0000000000..53356cd02c
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/postmortem.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<script>
+onload = function() {
+  var width = document.querySelector("img").width;
+  window.parent.postMessage({status: "postmortem",
+                             width}, "*");
+};
+</script>
+<img src="image-20px.png">
diff --git a/dom/serviceworkers/test/fetch/imagecache/register.html b/dom/serviceworkers/test/fetch/imagecache/register.html
new file mode 100644
index 0000000000..f6d1eb382f
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/register.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<!-- Load the image here to put it in the image cache -->
+<img src="image-20px.png">
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("imagecache_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/imagecache/unregister.html b/dom/serviceworkers/test/fetch/imagecache/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/imagecache/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/importscript-mixedcontent/https_test.js b/dom/serviceworkers/test/fetch/importscript-mixedcontent/https_test.js
new file mode 100644
index 0000000000..138ca768aa
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/importscript-mixedcontent/https_test.js
@@ -0,0 +1,31 @@
+function sendResponseToParent(response) {
+  return `
+    <!DOCTYPE html>
+    <script>
+      window.parent.postMessage({status: "done", data: "${response}"}, "*");
+    </script>
+  `;
+}
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    var response = "good";
+    try {
+      importScripts("http://example.org/tests/dom/workers/test/foreign.js");
+    } catch (e) {
+      dump("Got error " + e + " when importing the script\n");
+    }
+    if (response === "good") {
+      try {
+        importScripts("/tests/dom/workers/test/redirect_to_foreign.sjs");
+      } catch (e) {
+        dump("Got error " + e + " when importing the script\n");
+      }
+    }
+    event.respondWith(
+      new Response(sendResponseToParent(response), {
+        headers: { "Content-Type": "text/html" },
+      })
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/importscript-mixedcontent/register.html b/dom/serviceworkers/test/fetch/importscript-mixedcontent/register.html
new file mode 100644
index 0000000000..41774f70d1
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/importscript-mixedcontent/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("https_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/importscript-mixedcontent/unregister.html b/dom/serviceworkers/test/fetch/importscript-mixedcontent/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/importscript-mixedcontent/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/index.html b/dom/serviceworkers/test/fetch/index.html
new file mode 100644
index 0000000000..693810c6fc
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/index.html
@@ -0,0 +1,191 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 94048 - test install event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<div id="style-test" style="background-color: white"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  function my_ok(result, msg) {
+    window.opener.postMessage({status: "ok", result, message: msg}, "*");
+  }
+
+  function check_intercepted_script() {
+    document.getElementById('intercepted-script').test_result =
+      document.currentScript == document.getElementById('intercepted-script');
+  }
+
+  function fetchXHR(name, onload, onerror, headers) {
+    gExpected++;
+
+    onload = onload || function() {
+      my_ok(false, "load should not complete successfully");
+      finish();
+    };
+    onerror = onerror || function() {
+      my_ok(false, "load should be intercepted successfully");
+      finish();
+    };
+
+    var x = new XMLHttpRequest();
+    x.open('GET', name, true);
+    x.onload = function() { onload(x) };
+    x.onerror = function() { onerror(x) };
+    headers = headers || [];
+    headers.forEach(function(header) {
+      x.setRequestHeader(header[0], header[1]);
+    });
+    x.send();
+  }
+
+  var gExpected = 0;
+  var gEncountered = 0;
+  function finish() {
+    gEncountered++;
+    if (gEncountered == gExpected) {
+      window.opener.postMessage({status: "done"}, "*");
+    }
+  }
+
+  function test_onload(creator, complete) {
+    gExpected++;
+    var elem = creator();
+    elem.onload = function() {
+      complete.call(elem);
+      finish();
+    };
+    elem.onerror = function() {
+      my_ok(false, elem.tagName + " load should complete successfully");
+      finish();
+    };
+    document.body.appendChild(elem);
+  }
+
+  function expectAsyncResult() {
+    gExpected++;
+  }
+
+  my_ok(navigator.serviceWorker.controller != null, "should be controlled");
+</script>
+<script src="fetch_tests.js"></script>
+<script>
+  test_onload(function() {
+    var elem = document.createElement('img');
+    elem.src = "nonexistent_image.gifs";
+    elem.id = 'intercepted-img';
+    return elem;
+  }, function() {
+    my_ok(this.complete, "image should be complete");
+    my_ok(this.naturalWidth == 1 && this.naturalHeight == 1, "image should be 1x1 gif");
+  });
+
+  test_onload(function() {
+    var elem = document.createElement('script');
+    elem.id = 'intercepted-script';
+    elem.src = "nonexistent_script.js";
+    return elem;
+  }, function() {
+    my_ok(this.test_result, "script load should be intercepted");
+  });
+
+  test_onload(function() {
+    var elem = document.createElement('link');
+    elem.href = "nonexistent_stylesheet.css";
+    elem.rel = "stylesheet";
+    return elem;
+  }, function() {
+    var styled = document.getElementById('style-test');
+    my_ok(window.getComputedStyle(styled).backgroundColor == 'rgb(0, 0, 0)',
+          "stylesheet load should be intercepted");
+  });
+
+  test_onload(function() {
+    var elem = document.createElement('iframe');
+    elem.id = 'intercepted-iframe';
+    elem.src = "nonexistent_page.html";
+    return elem;
+  }, function() {
+    my_ok(this.test_result, "iframe load should be intercepted");
+  });
+
+  test_onload(function() {
+    var elem = document.createElement('iframe');
+    elem.id = 'intercepted-iframe-2';
+    elem.src = "navigate.html";
+    return elem;
+  }, function() {
+    my_ok(this.test_result, "iframe should successfully load");
+  });
+
+  gExpected++;
+  var xhr = new XMLHttpRequest();
+  xhr.addEventListener("load", function(evt) {
+    my_ok(evt.target.responseXML === null, "Load synthetic cross origin XML Document should be allowed");
+    finish();
+  });
+  xhr.responseType = "document";
+  xhr.open("GET", "load_cross_origin_xml_document_synthetic.xml");
+  xhr.send();
+
+  gExpected++;
+  fetch(
+    "load_cross_origin_xml_document_cors.xml",
+    {mode: "same-origin"}
+  ).then(function(response) {
+    // issue: https://github.com/whatwg/fetch/issues/629
+    my_ok(false, "Load CORS cross origin XML Document should not be allowed");
+    finish();
+  }, function(error) {
+    my_ok(true, "Load CORS cross origin XML Document should not be allowed");
+    finish();
+  });
+
+  gExpected++;
+  fetch(
+    "load_cross_origin_xml_document_opaque.xml",
+    {mode: "same-origin"}
+  ).then(function(response) {
+    my_ok(false, "Load opaque cross origin XML Document should not be allowed");
+    finish();
+  }, function(error) {
+    my_ok(true, "Load opaque cross origin XML Document should not be allowed");
+    finish();
+  });
+
+  gExpected++;
+  var worker = new Worker('nonexistent_worker_script.js');
+  worker.onmessage = function(e) {
+    my_ok(e.data == "worker-intercept-success", "worker load intercepted");
+    finish();
+  };
+  worker.onerror = function() {
+    my_ok(false, "worker load should be intercepted");
+  };
+
+  gExpected++;
+  var worker = new Worker('fetch_worker_script.js');
+  worker.onmessage = function(e) {
+    if (e.data == "finish") {
+      finish();
+    } else if (e.data == "expect") {
+      gExpected++;
+    } else if (e.data.type == "ok") {
+      my_ok(e.data.value, "Fetch test on worker: " + e.data.msg);
+    }
+  };
+  worker.onerror = function() {
+    my_ok(false, "worker should not cause any errors");
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/fetch/interrupt.sjs b/dom/serviceworkers/test/fetch/interrupt.sjs
new file mode 100644
index 0000000000..a7aaa79a99
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/interrupt.sjs
@@ -0,0 +1,20 @@
+function handleRequest(request, response) {
+  var body = "a";
+  for (var i = 0; i < 20; i++) {
+    body += body;
+  }
+
+  response.seizePower();
+  response.write("HTTP/1.1 200 OK\r\n");
+  var count = 10;
+  response.write("Content-Length: " + body.length * count + "\r\n");
+  response.write("Content-Type: text/plain; charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache, must-revalidate\r\n");
+  response.write("\r\n");
+
+  for (var i = 0; i < count; i++) {
+    response.write(body);
+  }
+
+  throw Components.Exception("", Cr.NS_BINDING_ABORTED);
+}
diff --git a/dom/serviceworkers/test/fetch/origin/https/index-https.sjs b/dom/serviceworkers/test/fetch/origin/https/index-https.sjs
new file mode 100644
index 0000000000..5250467ec7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/index-https.sjs
@@ -0,0 +1,8 @@
+function handleRequest(request, response) {
+  response.setStatusLine(null, 308, "Permanent Redirect");
+  response.setHeader(
+    "Location",
+    "https://example.org/tests/dom/serviceworkers/test/fetch/origin/https/realindex.html",
+    false
+  );
+}
diff --git a/dom/serviceworkers/test/fetch/origin/https/origin_test.js b/dom/serviceworkers/test/fetch/origin/https/origin_test.js
new file mode 100644
index 0000000000..d148de2d83
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/origin_test.js
@@ -0,0 +1,29 @@
+var prefix = "/tests/dom/serviceworkers/test/fetch/origin/https/";
+
+function addOpaqueRedirect(cache, file) {
+  return fetch(new Request(prefix + file, { redirect: "manual" })).then(
+    function (response) {
+      return cache.put(prefix + file, response);
+    }
+  );
+}
+
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    self.caches.open("origin-cache").then(c => {
+      return addOpaqueRedirect(c, "index-https.sjs");
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index-cached-https.sjs")) {
+    event.respondWith(
+      self.caches.open("origin-cache").then(c => {
+        return c.match(prefix + "index-https.sjs");
+      })
+    );
+  } else {
+    event.respondWith(fetch(event.request));
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/origin/https/realindex.html b/dom/serviceworkers/test/fetch/origin/https/realindex.html
new file mode 100644
index 0000000000..87f3489455
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/realindex.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<script>
+  window.opener.postMessage({status: "domain", data: document.domain}, "*");
+  window.opener.postMessage({status: "origin", data: location.origin}, "*");
+  window.opener.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/origin/https/realindex.html^headers^ b/dom/serviceworkers/test/fetch/origin/https/realindex.html^headers^
new file mode 100644
index 0000000000..5ed82fd065
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/realindex.html^headers^
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: https://example.com
diff --git a/dom/serviceworkers/test/fetch/origin/https/register.html b/dom/serviceworkers/test/fetch/origin/https/register.html
new file mode 100644
index 0000000000..2e99adba53
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("origin_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/origin/https/unregister.html b/dom/serviceworkers/test/fetch/origin/https/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/https/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/origin/index-to-https.sjs b/dom/serviceworkers/test/fetch/origin/index-to-https.sjs
new file mode 100644
index 0000000000..2505c03686
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/index-to-https.sjs
@@ -0,0 +1,8 @@
+function handleRequest(request, response) {
+  response.setStatusLine(null, 308, "Permanent Redirect");
+  response.setHeader(
+    "Location",
+    "https://example.org/tests/dom/serviceworkers/test/fetch/origin/realindex.html",
+    false
+  );
+}
diff --git a/dom/serviceworkers/test/fetch/origin/index.sjs b/dom/serviceworkers/test/fetch/origin/index.sjs
new file mode 100644
index 0000000000..ca11827792
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/index.sjs
@@ -0,0 +1,8 @@
+function handleRequest(request, response) {
+  response.setStatusLine(null, 308, "Permanent Redirect");
+  response.setHeader(
+    "Location",
+    "http://example.org/tests/dom/serviceworkers/test/fetch/origin/realindex.html",
+    false
+  );
+}
diff --git a/dom/serviceworkers/test/fetch/origin/origin_test.js b/dom/serviceworkers/test/fetch/origin/origin_test.js
new file mode 100644
index 0000000000..d57f10cc2a
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/origin_test.js
@@ -0,0 +1,38 @@
+var prefix = "/tests/dom/serviceworkers/test/fetch/origin/";
+
+function addOpaqueRedirect(cache, file) {
+  return fetch(new Request(prefix + file, { redirect: "manual" })).then(
+    function (response) {
+      return cache.put(prefix + file, response);
+    }
+  );
+}
+
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    self.caches.open("origin-cache").then(c => {
+      return Promise.all([
+        addOpaqueRedirect(c, "index.sjs"),
+        addOpaqueRedirect(c, "index-to-https.sjs"),
+      ]);
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index-cached.sjs")) {
+    event.respondWith(
+      self.caches.open("origin-cache").then(c => {
+        return c.match(prefix + "index.sjs");
+      })
+    );
+  } else if (event.request.url.includes("index-to-https-cached.sjs")) {
+    event.respondWith(
+      self.caches.open("origin-cache").then(c => {
+        return c.match(prefix + "index-to-https.sjs");
+      })
+    );
+  } else {
+    event.respondWith(fetch(event.request));
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/origin/realindex.html b/dom/serviceworkers/test/fetch/origin/realindex.html
new file mode 100644
index 0000000000..87f3489455
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/realindex.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<script>
+  window.opener.postMessage({status: "domain", data: document.domain}, "*");
+  window.opener.postMessage({status: "origin", data: location.origin}, "*");
+  window.opener.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/origin/realindex.html^headers^ b/dom/serviceworkers/test/fetch/origin/realindex.html^headers^
new file mode 100644
index 0000000000..3a6a85d894
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/realindex.html^headers^
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: http://mochi.test:8888
diff --git a/dom/serviceworkers/test/fetch/origin/register.html b/dom/serviceworkers/test/fetch/origin/register.html
new file mode 100644
index 0000000000..2e99adba53
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("origin_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/origin/unregister.html b/dom/serviceworkers/test/fetch/origin/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/origin/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/plugin/plugins.html b/dom/serviceworkers/test/fetch/plugin/plugins.html
new file mode 100644
index 0000000000..b268f6d99e
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/plugin/plugins.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<script>
+  var obj, embed;
+
+  function ok(v, msg) {
+    window.opener.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function finish() {
+    document.documentElement.removeChild(obj);
+    document.documentElement.removeChild(embed);
+    window.opener.postMessage({status: "done"}, "*");
+  }
+
+  function test_object() {
+    obj = document.createElement("object");
+    obj.setAttribute('data', "object");
+    document.documentElement.appendChild(obj);
+  }
+
+  function test_embed() {
+    embed = document.createElement("embed");
+    embed.setAttribute('src', "embed");
+    document.documentElement.appendChild(embed);
+  }
+
+  navigator.serviceWorker.addEventListener("message", function onMessage(e) {
+    if (e.data.destination === "object") {
+      ok(false, "<object> should not be intercepted");
+    } else if (e.data.destination === "embed") {
+      ok(false, "<embed> should not be intercepted");
+    } else if (e.data.destination === "" && e.data.resource === "foo.txt") {
+      navigator.serviceWorker.removeEventListener("message", onMessage);
+      finish();
+    }
+  });
+
+  test_object();
+  test_embed();
+  // SW will definitely intercept fetch API, use this to see if plugins are
+  // intercepted before fetch().
+  fetch("foo.txt");
+</script>
diff --git a/dom/serviceworkers/test/fetch/plugin/worker.js b/dom/serviceworkers/test/fetch/plugin/worker.js
new file mode 100644
index 0000000000..9849c9e0d5
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/plugin/worker.js
@@ -0,0 +1,15 @@
+self.addEventListener("fetch", function (event) {
+  var resource = event.request.url.split("/").pop();
+  event.waitUntil(
+    clients.matchAll().then(clients => {
+      clients.forEach(client => {
+        if (client.url.includes("plugins.html")) {
+          client.postMessage({
+            destination: event.request.destination,
+            resource,
+          });
+        }
+      });
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/fetch/real-file.txt b/dom/serviceworkers/test/fetch/real-file.txt
new file mode 100644
index 0000000000..3ca2088ec0
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/real-file.txt
@@ -0,0 +1 @@
+This is a real file.
diff --git a/dom/serviceworkers/test/fetch/redirect.sjs b/dom/serviceworkers/test/fetch/redirect.sjs
new file mode 100644
index 0000000000..dab558f4a8
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/redirect.sjs
@@ -0,0 +1,4 @@
+function handleRequest(request, response) {
+  response.setStatusLine(request.httpVersion, 301, "Moved Permanently");
+  response.setHeader("Location", "synthesized-redirect-twice-real-file.txt");
+}
diff --git a/dom/serviceworkers/test/fetch/requesturl/index.html b/dom/serviceworkers/test/fetch/requesturl/index.html
new file mode 100644
index 0000000000..bc3e400a94
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/index.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.onmessage = window.onmessage = e => {
+    window.parent.postMessage(e.data, "*");
+  };
+</script>
+<iframe src="redirector.html"></iframe>
diff --git a/dom/serviceworkers/test/fetch/requesturl/redirect.sjs b/dom/serviceworkers/test/fetch/requesturl/redirect.sjs
new file mode 100644
index 0000000000..ae50a78aef
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/redirect.sjs
@@ -0,0 +1,8 @@
+function handleRequest(request, response) {
+  response.setStatusLine(null, 308, "Permanent Redirect");
+  response.setHeader(
+    "Location",
+    "http://example.org/tests/dom/serviceworkers/test/fetch/requesturl/secret.html",
+    false
+  );
+}
diff --git a/dom/serviceworkers/test/fetch/requesturl/redirector.html b/dom/serviceworkers/test/fetch/requesturl/redirector.html
new file mode 100644
index 0000000000..0a3afab9ee
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/redirector.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<meta http-equiv="refresh" content="3;URL=/tests/dom/serviceworkers/test/fetch/requesturl/redirect.sjs">
diff --git a/dom/serviceworkers/test/fetch/requesturl/register.html b/dom/serviceworkers/test/fetch/requesturl/register.html
new file mode 100644
index 0000000000..19a2e022c2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("requesturl_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/requesturl/requesturl_test.js b/dom/serviceworkers/test/fetch/requesturl/requesturl_test.js
new file mode 100644
index 0000000000..4d2680538f
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/requesturl_test.js
@@ -0,0 +1,21 @@
+addEventListener("fetch", event => {
+  var url = event.request.url;
+  var badURL = url.indexOf("secret.html") > -1;
+  event.respondWith(
+    new Promise(resolve => {
+      clients.matchAll().then(clients => {
+        for (var client of clients) {
+          if (client.url.indexOf("index.html") > -1) {
+            client.postMessage({
+              status: "ok",
+              result: !badURL,
+              message: "Should not find a bad URL (" + url + ")",
+            });
+            break;
+          }
+        }
+        resolve(fetch(event.request));
+      });
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/fetch/requesturl/secret.html b/dom/serviceworkers/test/fetch/requesturl/secret.html
new file mode 100644
index 0000000000..694c336355
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/secret.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+secret stuff
+<script>
+  window.parent.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/requesturl/unregister.html b/dom/serviceworkers/test/fetch/requesturl/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/requesturl/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/sandbox/index.html b/dom/serviceworkers/test/fetch/sandbox/index.html
new file mode 100644
index 0000000000..1094a3995d
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/sandbox/index.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({status: "ok", result: true, message: "The iframe is not being intercepted"}, "*");
+  window.parent.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/sandbox/intercepted_index.html b/dom/serviceworkers/test/fetch/sandbox/intercepted_index.html
new file mode 100644
index 0000000000..87261a495f
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/sandbox/intercepted_index.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({status: "ok", result: false, message: "The iframe is being intercepted"}, "*");
+  window.parent.postMessage({status: "done"}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/sandbox/register.html b/dom/serviceworkers/test/fetch/sandbox/register.html
new file mode 100644
index 0000000000..427b1a8da9
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/sandbox/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("sandbox_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/sandbox/sandbox_test.js b/dom/serviceworkers/test/fetch/sandbox/sandbox_test.js
new file mode 100644
index 0000000000..310cea0d16
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/sandbox/sandbox_test.js
@@ -0,0 +1,5 @@
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    event.respondWith(fetch("intercepted_index.html"));
+  }
+});
diff --git a/dom/serviceworkers/test/fetch/sandbox/unregister.html b/dom/serviceworkers/test/fetch/sandbox/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/sandbox/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html b/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html
new file mode 100644
index 0000000000..e99209aa4d
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<script>
+  window.onmessage = function(e) {
+    window.parent.postMessage(e.data, "*");
+    if (e.data.status == "protocol") {
+      document.querySelector("iframe").src = "image.html";
+    }
+  };
+</script>
+<iframe src="http://example.com/tests/dom/serviceworkers/test/fetch/upgrade-insecure/index.html"></iframe>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html^headers^ b/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html^headers^
new file mode 100644
index 0000000000..602d9dc38d
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html^headers^
@@ -0,0 +1 @@
+Content-Security-Policy: upgrade-insecure-requests
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/image-20px.png b/dom/serviceworkers/test/fetch/upgrade-insecure/image-20px.png
new file mode 100644
index 0000000000..ae6a8a6b88
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/image-20px.png
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/image-40px.png b/dom/serviceworkers/test/fetch/upgrade-insecure/image-40px.png
new file mode 100644
index 0000000000..fe391dc8a2
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/image-40px.png
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/image.html b/dom/serviceworkers/test/fetch/upgrade-insecure/image.html
new file mode 100644
index 0000000000..dfcfd80014
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/image.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<script>
+onload=function(){
+  var img = new Image();
+  img.src = "http://example.com/tests/dom/serviceworkers/test/fetch/upgrade-insecure/image-20px.png";
+  img.onload = function() {
+    window.parent.postMessage({status: "image", data: img.width}, "*");
+  };
+  img.onerror = function() {
+    window.parent.postMessage({status: "image", data: "error"}, "*");
+  };
+};
+</script>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/realindex.html b/dom/serviceworkers/test/fetch/upgrade-insecure/realindex.html
new file mode 100644
index 0000000000..aaa255aad3
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/realindex.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({status: "protocol", data: location.protocol}, "*");
+</script>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/register.html b/dom/serviceworkers/test/fetch/upgrade-insecure/register.html
new file mode 100644
index 0000000000..6309b9b218
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/register.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  function done(reg) {
+    ok(reg.active, "The active worker should be available.");
+    window.parent.postMessage({status: "registrationdone"}, "*");
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("upgrade-insecure_test.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/unregister.html b/dom/serviceworkers/test/fetch/upgrade-insecure/unregister.html
new file mode 100644
index 0000000000..1f13508fa7
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/unregister.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    registration.unregister().then(function(success) {
+      if (success) {
+        window.parent.postMessage({status: "unregistrationdone"}, "*");
+      }
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  });
+</script>
diff --git a/dom/serviceworkers/test/fetch/upgrade-insecure/upgrade-insecure_test.js b/dom/serviceworkers/test/fetch/upgrade-insecure/upgrade-insecure_test.js
new file mode 100644
index 0000000000..74b9ed23ba
--- /dev/null
+++ b/dom/serviceworkers/test/fetch/upgrade-insecure/upgrade-insecure_test.js
@@ -0,0 +1,11 @@
+self.addEventListener("fetch", function (event) {
+  if (event.request.url.includes("index.html")) {
+    event.respondWith(fetch("realindex.html"));
+  } else if (event.request.url.includes("image-20px.png")) {
+    if (event.request.url.indexOf("https://") == 0) {
+      event.respondWith(fetch("image-40px.png"));
+    } else {
+      event.respondWith(Response.error());
+    }
+  }
+});
diff --git a/dom/serviceworkers/test/fetch_event_worker.js b/dom/serviceworkers/test/fetch_event_worker.js
new file mode 100644
index 0000000000..6b8c37f802
--- /dev/null
+++ b/dom/serviceworkers/test/fetch_event_worker.js
@@ -0,0 +1,365 @@
+// eslint-disable-next-line complexity
+onfetch = function (ev) {
+  if (ev.request.url.includes("ignore")) {
+    return;
+  }
+
+  if (ev.request.url.includes("bare-synthesized.txt")) {
+    ev.respondWith(
+      Promise.resolve(new Response("synthesized response body", {}))
+    );
+  } else if (ev.request.url.includes("file_CrossSiteXHR_server.sjs")) {
+    // N.B. this response would break the rules of CORS if it were allowed, but
+    //      this test relies upon the preflight request not being intercepted and
+    //      thus this response should not be used.
+    if (ev.request.method == "OPTIONS") {
+      ev.respondWith(
+        new Response("", {
+          headers: {
+            "Access-Control-Allow-Origin": "*",
+            "Access-Control-Allow-Headers": "X-Unsafe",
+          },
+        })
+      );
+    } else if (ev.request.url.includes("example.org")) {
+      ev.respondWith(fetch(ev.request));
+    }
+  } else if (ev.request.url.includes("synthesized-404.txt")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("synthesized response body", { status: 404 })
+      )
+    );
+  } else if (ev.request.url.includes("synthesized-headers.txt")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("synthesized response body", {
+          headers: {
+            "X-Custom-Greeting": "Hello",
+          },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("test-respondwith-response.txt")) {
+    ev.respondWith(new Response("test-respondwith-response response body", {}));
+  } else if (ev.request.url.includes("synthesized-redirect-real-file.txt")) {
+    ev.respondWith(Promise.resolve(Response.redirect("fetch/real-file.txt")));
+  } else if (
+    ev.request.url.includes("synthesized-redirect-twice-real-file.txt")
+  ) {
+    ev.respondWith(
+      Promise.resolve(Response.redirect("synthesized-redirect-real-file.txt"))
+    );
+  } else if (ev.request.url.includes("synthesized-redirect-synthesized.txt")) {
+    ev.respondWith(Promise.resolve(Response.redirect("bare-synthesized.txt")));
+  } else if (
+    ev.request.url.includes("synthesized-redirect-twice-synthesized.txt")
+  ) {
+    ev.respondWith(
+      Promise.resolve(Response.redirect("synthesized-redirect-synthesized.txt"))
+    );
+  } else if (ev.request.url.includes("rejected.txt")) {
+    ev.respondWith(Promise.reject());
+  } else if (ev.request.url.includes("nonresponse.txt")) {
+    ev.respondWith(Promise.resolve(5));
+  } else if (ev.request.url.includes("nonresponse2.txt")) {
+    ev.respondWith(Promise.resolve({}));
+  } else if (ev.request.url.includes("nonpromise.txt")) {
+    try {
+      // This should coerce to Promise(5) instead of throwing
+      ev.respondWith(5);
+    } catch (e) {
+      // test is expecting failure, so return a success if we get a thrown
+      // exception
+      ev.respondWith(new Response("respondWith(5) threw " + e));
+    }
+  } else if (ev.request.url.includes("headers.txt")) {
+    var ok = true;
+    ok &= ev.request.headers.get("X-Test1") == "header1";
+    ok &= ev.request.headers.get("X-Test2") == "header2";
+    ev.respondWith(Promise.resolve(new Response(ok.toString(), {})));
+  } else if (ev.request.url.includes("readable-stream.txt")) {
+    ev.respondWith(
+      new Response(
+        new ReadableStream({
+          start(controller) {
+            controller.enqueue(
+              new Uint8Array([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21])
+            );
+            controller.close();
+          },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("readable-stream-locked.txt")) {
+    let stream = new ReadableStream({
+      start(controller) {
+        controller.enqueue(
+          new Uint8Array([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21])
+        );
+        controller.close();
+      },
+    });
+
+    ev.respondWith(new Response(stream));
+
+    // This locks the stream.
+    stream.getReader();
+  } else if (ev.request.url.includes("readable-stream-with-exception.txt")) {
+    ev.respondWith(
+      new Response(
+        new ReadableStream({
+          start(controller) {},
+          pull() {
+            throw "EXCEPTION!";
+          },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("readable-stream-with-exception2.txt")) {
+    ev.respondWith(
+      new Response(
+        new ReadableStream({
+          _controller: null,
+          _count: 0,
+
+          start(controller) {
+            this._controller = controller;
+          },
+          pull() {
+            if (++this._count == 5) {
+              throw "EXCEPTION 2!";
+            }
+            this._controller.enqueue(new Uint8Array([this._count]));
+          },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("readable-stream-already-consumed.txt")) {
+    let r = new Response(
+      new ReadableStream({
+        start(controller) {
+          controller.enqueue(
+            new Uint8Array([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21])
+          );
+          controller.close();
+        },
+      })
+    );
+
+    r.blob();
+
+    ev.respondWith(r);
+  } else if (ev.request.url.includes("user-pass")) {
+    ev.respondWith(new Response(ev.request.url));
+  } else if (ev.request.url.includes("nonexistent_image.gif")) {
+    var imageAsBinaryString = atob(
+      "R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs"
+    );
+    var imageLength = imageAsBinaryString.length;
+
+    // If we just pass |imageAsBinaryString| to the Response constructor, an
+    // encoding conversion occurs that corrupts the image. Instead, we need to
+    // convert it to a typed array.
+    // typed array.
+    var imageAsArray = new Uint8Array(imageLength);
+    for (var i = 0; i < imageLength; ++i) {
+      imageAsArray[i] = imageAsBinaryString.charCodeAt(i);
+    }
+
+    ev.respondWith(
+      Promise.resolve(
+        new Response(imageAsArray, { headers: { "Content-Type": "image/gif" } })
+      )
+    );
+  } else if (ev.request.url.includes("nonexistent_script.js")) {
+    ev.respondWith(
+      Promise.resolve(new Response("check_intercepted_script();", {}))
+    );
+  } else if (ev.request.url.includes("nonexistent_stylesheet.css")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("#style-test { background-color: black !important; }", {
+          headers: {
+            "Content-Type": "text/css",
+          },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("nonexistent_page.html")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response(
+          "<script>window.frameElement.test_result = true;</script>",
+          {
+            headers: {
+              "Content-Type": "text/html",
+            },
+          }
+        )
+      )
+    );
+  } else if (ev.request.url.includes("navigate.html")) {
+    var requests = [
+      // should not throw
+      new Request(ev.request),
+      new Request(ev.request, undefined),
+      new Request(ev.request, null),
+      new Request(ev.request, {}),
+      new Request(ev.request, { someUnrelatedProperty: 42 }),
+      new Request(ev.request, { method: "GET" }),
+    ];
+    ev.respondWith(
+      Promise.resolve(
+        new Response(
+          "<script>window.frameElement.test_result = true;</script>",
+          {
+            headers: {
+              "Content-Type": "text/html",
+            },
+          }
+        )
+      )
+    );
+  } else if (ev.request.url.includes("nonexistent_worker_script.js")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("postMessage('worker-intercept-success')", {
+          headers: { "Content-Type": "text/javascript" },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("nonexistent_imported_script.js")) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("check_intercepted_script();", {
+          headers: { "Content-Type": "text/javascript" },
+        })
+      )
+    );
+  } else if (ev.request.url.includes("deliver-gzip")) {
+    // Don't handle the request, this will make Necko perform a network request, at
+    // which point SetApplyConversion must be re-enabled, otherwise the request
+    // will fail.
+    // eslint-disable-next-line no-useless-return
+    return;
+  } else if (ev.request.url.includes("hello.gz")) {
+    ev.respondWith(fetch("fetch/deliver-gzip.sjs"));
+  } else if (ev.request.url.includes("hello-after-extracting.gz")) {
+    ev.respondWith(
+      fetch("fetch/deliver-gzip.sjs").then(function (res) {
+        return res.text().then(function (body) {
+          return new Response(body, {
+            status: res.status,
+            statusText: res.statusText,
+            headers: res.headers,
+          });
+        });
+      })
+    );
+  } else if (ev.request.url.includes("opaque-on-same-origin")) {
+    var url =
+      "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200";
+    ev.respondWith(fetch(url, { mode: "no-cors" }));
+  } else if (ev.request.url.includes("opaque-no-cors")) {
+    if (ev.request.mode != "no-cors") {
+      ev.respondWith(Promise.reject());
+      return;
+    }
+
+    var url =
+      "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200";
+    ev.respondWith(fetch(url, { mode: ev.request.mode }));
+  } else if (ev.request.url.includes("cors-for-no-cors")) {
+    if (ev.request.mode != "no-cors") {
+      ev.respondWith(Promise.reject());
+      return;
+    }
+
+    var url =
+      "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200&allowOrigin=*";
+    ev.respondWith(fetch(url));
+  } else if (ev.request.url.includes("example.com")) {
+    ev.respondWith(fetch(ev.request));
+  } else if (ev.request.url.includes("body-")) {
+    ev.respondWith(
+      ev.request.text().then(function (body) {
+        return new Response(body + body);
+      })
+    );
+  } else if (ev.request.url.includes("something.txt")) {
+    ev.respondWith(Response.redirect("fetch/somethingelse.txt"));
+  } else if (ev.request.url.includes("somethingelse.txt")) {
+    ev.respondWith(new Response("something else response body", {}));
+  } else if (ev.request.url.includes("redirect_serviceworker.sjs")) {
+    // The redirect_serviceworker.sjs server-side JavaScript file redirects to
+    // 'http://mochi.test:8888/tests/dom/serviceworkers/test/worker.js'
+    // The redirected fetch should not go through the SW since the original
+    // fetch was initiated from a SW.
+    ev.respondWith(fetch("redirect_serviceworker.sjs"));
+  } else if (
+    ev.request.url.includes("load_cross_origin_xml_document_synthetic.xml")
+  ) {
+    ev.respondWith(
+      Promise.resolve(
+        new Response("<response>body</response>", {
+          headers: { "Content-Type": "text/xtml" },
+        })
+      )
+    );
+  } else if (
+    ev.request.url.includes("load_cross_origin_xml_document_cors.xml")
+  ) {
+    if (ev.request.mode != "same-origin") {
+      ev.respondWith(Promise.reject());
+      return;
+    }
+
+    var url =
+      "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200&allowOrigin=*";
+    ev.respondWith(fetch(url, { mode: "cors" }));
+  } else if (
+    ev.request.url.includes("load_cross_origin_xml_document_opaque.xml")
+  ) {
+    if (ev.request.mode != "same-origin") {
+      Promise.resolve(
+        new Response("<error>Invalid Request mode</error>", {
+          headers: { "Content-Type": "text/xtml" },
+        })
+      );
+      return;
+    }
+
+    var url =
+      "http://example.com/tests/dom/security/test/cors/file_CrossSiteXHR_server.sjs?status=200";
+    ev.respondWith(fetch(url, { mode: "no-cors" }));
+  } else if (ev.request.url.includes("xhr-method-test.txt")) {
+    ev.respondWith(new Response("intercepted " + ev.request.method));
+  } else if (ev.request.url.includes("empty-header")) {
+    if (
+      !ev.request.headers.has("emptyheader") ||
+      ev.request.headers.get("emptyheader") !== ""
+    ) {
+      ev.respondWith(Promise.reject());
+      return;
+    }
+    ev.respondWith(new Response("emptyheader"));
+  } else if (ev.request.url.includes("fetchevent-extendable")) {
+    if (ev instanceof ExtendableEvent) {
+      ev.respondWith(new Response("extendable"));
+    } else {
+      ev.respondWith(Promise.reject());
+    }
+  } else if (ev.request.url.includes("fetchevent-request")) {
+    var threw = false;
+    try {
+      new FetchEvent("foo");
+    } catch (e) {
+      if (e.name == "TypeError") {
+        threw = true;
+      }
+    } finally {
+      ev.respondWith(new Response(threw ? "non-nullable" : "nullable"));
+    }
+  }
+};
diff --git a/dom/serviceworkers/test/file_blob_response_worker.js b/dom/serviceworkers/test/file_blob_response_worker.js
new file mode 100644
index 0000000000..e9d5366c42
--- /dev/null
+++ b/dom/serviceworkers/test/file_blob_response_worker.js
@@ -0,0 +1,39 @@
+function makeFileBlob(obj) {
+  return new Promise(function (resolve, reject) {
+    var request = indexedDB.open("file_blob_response_worker", 1);
+    request.onerror = reject;
+    request.onupgradeneeded = function (evt) {
+      var db = evt.target.result;
+      db.onerror = reject;
+
+      var objectStore = db.createObjectStore("test", { autoIncrement: true });
+      var index = objectStore.createIndex("test", "index");
+    };
+
+    request.onsuccess = function (evt) {
+      var db = evt.target.result;
+      db.onerror = reject;
+
+      var blob = new Blob([JSON.stringify(obj)], { type: "application/json" });
+      var data = { blob, index: 5 };
+
+      objectStore = db.transaction("test", "readwrite").objectStore("test");
+      objectStore.add(data).onsuccess = function (event) {
+        var key = event.target.result;
+        objectStore = db.transaction("test").objectStore("test");
+        objectStore.get(key).onsuccess = function (event1) {
+          resolve(event1.target.result.blob);
+        };
+      };
+    };
+  });
+}
+
+self.addEventListener("fetch", function (evt) {
+  var result = { value: "success" };
+  evt.respondWith(
+    makeFileBlob(result).then(function (blob) {
+      return new Response(blob);
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/file_js_cache.html b/dom/serviceworkers/test/file_js_cache.html
new file mode 100644
index 0000000000..6feb94d872
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Add a tag script to save the bytecode</title>
+</head>
+<body>
+  <script id="watchme" src="file_js_cache.js"></script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/file_js_cache.js b/dom/serviceworkers/test/file_js_cache.js
new file mode 100644
index 0000000000..b9b966775c
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache.js
@@ -0,0 +1,5 @@
+function baz() {}
+function bar() {}
+function foo() { bar() }
+foo();
+
diff --git a/dom/serviceworkers/test/file_js_cache_cleanup.js b/dom/serviceworkers/test/file_js_cache_cleanup.js
new file mode 100644
index 0000000000..c6853faaf2
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_cleanup.js
@@ -0,0 +1,16 @@
+"use strict";
+const { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+
+function clearCache() {
+  const cacheStorageSrv = Cc[
+    "@mozilla.org/netwerk/cache-storage-service;1"
+  ].getService(Ci.nsICacheStorageService);
+  cacheStorageSrv.clear();
+}
+
+addMessageListener("teardown", function () {
+  clearCache();
+  sendAsyncMessage("teardown-complete");
+});
diff --git a/dom/serviceworkers/test/file_js_cache_save_after_load.html b/dom/serviceworkers/test/file_js_cache_save_after_load.html
new file mode 100644
index 0000000000..8a696c0026
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_save_after_load.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Save the bytecode when all scripts are executed</title>
+</head>
+<body>
+  <script id="watchme" src="file_js_cache_save_after_load.js"></script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/file_js_cache_save_after_load.js b/dom/serviceworkers/test/file_js_cache_save_after_load.js
new file mode 100644
index 0000000000..7f5a20b524
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_save_after_load.js
@@ -0,0 +1,15 @@
+function send_ping() {
+  window.dispatchEvent(new Event("ping"));
+}
+send_ping(); // ping (=1)
+
+window.addEventListener("load", function () {
+  send_ping(); // ping (=2)
+
+  // Append a script which should call |foo|, before the encoding of this script
+  // bytecode.
+  var script = document.createElement("script");
+  script.type = "text/javascript";
+  script.innerText = "send_ping();"; // ping (=3)
+  document.head.appendChild(script);
+});
diff --git a/dom/serviceworkers/test/file_js_cache_syntax_error.html b/dom/serviceworkers/test/file_js_cache_syntax_error.html
new file mode 100644
index 0000000000..cc4a9b2daa
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_syntax_error.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Do not save bytecode on compilation errors</title>
+</head>
+<body>
+  <script id="watchme" src="file_js_cache_syntax_error.js"></script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/file_js_cache_syntax_error.js b/dom/serviceworkers/test/file_js_cache_syntax_error.js
new file mode 100644
index 0000000000..fcf587ae70
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_syntax_error.js
@@ -0,0 +1 @@
+var // SyntaxError: missing variable name.
diff --git a/dom/serviceworkers/test/file_js_cache_with_sri.html b/dom/serviceworkers/test/file_js_cache_with_sri.html
new file mode 100644
index 0000000000..38ecb26984
--- /dev/null
+++ b/dom/serviceworkers/test/file_js_cache_with_sri.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Add a tag script to save the bytecode</title>
+</head>
+<body>
+  <script id="watchme" src="file_js_cache.js"
+          integrity="sha384-8YSwN2ywq1SVThihWhj7uTVZ4UeIDwo3GgdPYnug+C+OS0oa6kH2IXBclwMaDJFb">
+  </script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/file_notification_openWindow.html b/dom/serviceworkers/test/file_notification_openWindow.html
new file mode 100644
index 0000000000..f220f4808d
--- /dev/null
+++ b/dom/serviceworkers/test/file_notification_openWindow.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1578070</title>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+window.onload = () => {
+  navigator.serviceWorker.ready.then(() => {
+    // Open and close a new window.
+    window.open("https://example.org/").close();
+
+    // If we make it here, then we didn't crash. Tell the worker we're done.
+    navigator.serviceWorker.controller.postMessage("DONE");
+
+    // We're done!
+    window.close();
+  });
+}
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/file_userContextId_openWindow.js b/dom/serviceworkers/test/file_userContextId_openWindow.js
new file mode 100644
index 0000000000..649a3152ba
--- /dev/null
+++ b/dom/serviceworkers/test/file_userContextId_openWindow.js
@@ -0,0 +1,3 @@
+onnotificationclick = event => {
+  clients.openWindow("empty.html");
+};
diff --git a/dom/serviceworkers/test/force_refresh_browser_worker.js b/dom/serviceworkers/test/force_refresh_browser_worker.js
new file mode 100644
index 0000000000..58256468bd
--- /dev/null
+++ b/dom/serviceworkers/test/force_refresh_browser_worker.js
@@ -0,0 +1,42 @@
+var name = "browserRefresherCache";
+
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    Promise.all([
+      caches.open(name),
+      fetch("./browser_cached_force_refresh.html"),
+    ]).then(function (results) {
+      var cache = results[0];
+      var response = results[1];
+      return cache.put("./browser_base_force_refresh.html", response);
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  event.respondWith(
+    caches
+      .open(name)
+      .then(function (cache) {
+        return cache.match(event.request);
+      })
+      .then(function (response) {
+        return response || fetch(event.request);
+      })
+  );
+});
+
+self.addEventListener("message", function (event) {
+  if (event.data.type === "GET_UNCONTROLLED_CLIENTS") {
+    event.waitUntil(
+      clients
+        .matchAll({ includeUncontrolled: true })
+        .then(function (clientList) {
+          var resultList = clientList.map(function (c) {
+            return { url: c.url, frameType: c.frameType };
+          });
+          event.source.postMessage({ type: "CLIENTS", detail: resultList });
+        })
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/force_refresh_worker.js b/dom/serviceworkers/test/force_refresh_worker.js
new file mode 100644
index 0000000000..8c8382493a
--- /dev/null
+++ b/dom/serviceworkers/test/force_refresh_worker.js
@@ -0,0 +1,43 @@
+var name = "refresherCache";
+
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    Promise.all([
+      caches.open(name),
+      fetch("./sw_clients/refresher_cached.html"),
+      fetch("./sw_clients/refresher_cached_compressed.html"),
+    ]).then(function (results) {
+      var cache = results[0];
+      var response = results[1];
+      var compressed = results[2];
+      return Promise.all([
+        cache.put("./sw_clients/refresher.html", response),
+        cache.put("./sw_clients/refresher_compressed.html", compressed),
+      ]);
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  event.respondWith(
+    caches
+      .open(name)
+      .then(function (cache) {
+        return cache.match(event.request);
+      })
+      .then(function (response) {
+        // If this is one of our primary cached responses, then the window
+        // must have generated the request via a normal window reload.  That
+        // should be detectable in the event.request.cache attribute.
+        if (response && event.request.cache !== "no-cache") {
+          dump(
+            '### ### FetchEvent.request.cache is "' +
+              event.request.cache +
+              '" instead of expected "no-cache"\n'
+          );
+          return Response.error();
+        }
+        return response || fetch(event.request);
+      })
+  );
+});
diff --git a/dom/serviceworkers/test/gtest/TestReadWrite.cpp b/dom/serviceworkers/test/gtest/TestReadWrite.cpp
new file mode 100644
index 0000000000..823647d22e
--- /dev/null
+++ b/dom/serviceworkers/test/gtest/TestReadWrite.cpp
@@ -0,0 +1,955 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/dom/ServiceWorkerRegistrar.h"
+#include "mozilla/dom/ServiceWorkerRegistrarTypes.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsIFile.h"
+#include "nsIOutputStream.h"
+#include "nsNetUtil.h"
+#include "nsPrintfCString.h"
+#include "nsIServiceWorkerManager.h"
+
+#include "prtime.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+class ServiceWorkerRegistrarTest : public ServiceWorkerRegistrar {
+ public:
+  ServiceWorkerRegistrarTest() {
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                         getter_AddRefs(mProfileDir));
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+#else
+    NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                           getter_AddRefs(mProfileDir));
+#endif
+    MOZ_DIAGNOSTIC_ASSERT(mProfileDir);
+  }
+
+  nsresult TestReadData() { return ReadData(); }
+  nsresult TestWriteData() MOZ_NO_THREAD_SAFETY_ANALYSIS {
+    return WriteData(mData);
+  }
+  void TestDeleteData() { DeleteData(); }
+
+  void TestRegisterServiceWorker(const ServiceWorkerRegistrationData& aData) {
+    mozilla::MonitorAutoLock lock(mMonitor);
+    RegisterServiceWorkerInternal(aData);
+  }
+
+  nsTArray<ServiceWorkerRegistrationData>& TestGetData()
+      MOZ_NO_THREAD_SAFETY_ANALYSIS {
+    return mData;
+  }
+};
+
+already_AddRefed<nsIFile> GetFile() {
+  nsCOMPtr<nsIFile> file;
+  nsresult rv =
+      NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  return file.forget();
+}
+
+bool CreateFile(const nsACString& aData) {
+  nsCOMPtr<nsIFile> file = GetFile();
+
+  nsCOMPtr<nsIOutputStream> stream;
+  nsresult rv = NS_NewLocalFileOutputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  uint32_t count;
+  rv = stream->Write(aData.Data(), aData.Length(), &count);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  if (count != aData.Length()) {
+    return false;
+  }
+
+  return true;
+}
+
+TEST(ServiceWorkerRegistrar, TestNoFile)
+{
+  nsCOMPtr<nsIFile> file = GetFile();
+  ASSERT_TRUE(file)
+  << "GetFile must return a nsIFIle";
+
+  bool exists;
+  nsresult rv = file->Exists(&exists);
+  ASSERT_EQ(NS_OK, rv) << "nsIFile::Exists cannot fail";
+
+  if (exists) {
+    rv = file->Remove(false);
+    ASSERT_EQ(NS_OK, rv) << "nsIFile::Remove cannot fail";
+  }
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)0, data.Length())
+      << "No data should be found in an empty file";
+}
+
+TEST(ServiceWorkerRegistrar, TestEmptyFile)
+{
+  ASSERT_TRUE(CreateFile(""_ns))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_NE(NS_OK, rv) << "ReadData() should fail if the file is empty";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)0, data.Length())
+      << "No data should be found in an empty file";
+}
+
+TEST(ServiceWorkerRegistrar, TestRightVersionFile)
+{
+  ASSERT_TRUE(CreateFile(nsLiteralCString(SERVICEWORKERREGISTRAR_VERSION "\n")))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv)
+      << "ReadData() should not fail when the version is correct";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)0, data.Length())
+      << "No data should be found in an empty file";
+}
+
+TEST(ServiceWorkerRegistrar, TestWrongVersionFile)
+{
+  ASSERT_TRUE(
+      CreateFile(nsLiteralCString(SERVICEWORKERREGISTRAR_VERSION "bla\n")))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_NE(NS_OK, rv)
+      << "ReadData() should fail when the version is not correct";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)0, data.Length())
+      << "No data should be found in an empty file";
+}
+
+TEST(ServiceWorkerRegistrar, TestReadData)
+{
+  nsAutoCString buffer(SERVICEWORKERREGISTRAR_VERSION "\n");
+
+  buffer.AppendLiteral("^inBrowser=1\n");
+  buffer.AppendLiteral("https://scope_0.org\ncurrentWorkerURL 0\n");
+  buffer.Append(SERVICEWORKERREGISTRAR_TRUE "\n");
+  buffer.AppendLiteral("cacheName 0\n");
+  buffer.AppendInt(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+                   16);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("true\n");
+  buffer.Append(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("https://scope_1.org\ncurrentWorkerURL 1\n");
+  buffer.Append(SERVICEWORKERREGISTRAR_FALSE "\n");
+  buffer.AppendLiteral("cacheName 1\n");
+  buffer.AppendInt(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL, 16);
+  buffer.AppendLiteral("\n");
+  PRTime ts = PR_Now();
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(1);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("false\n");
+  buffer.Append(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_TRUE(data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+  ASSERT_EQ(false, data[0].navigationPreloadState().enabled());
+  ASSERT_STREQ("true", data[0].navigationPreloadState().headerValue().get());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_FALSE(data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)ts, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)ts, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)ts, data[1].lastUpdateTime());
+  ASSERT_EQ(true, data[1].navigationPreloadState().enabled());
+  ASSERT_STREQ("false", data[1].navigationPreloadState().headerValue().get());
+}
+
+TEST(ServiceWorkerRegistrar, TestDeleteData)
+{
+  ASSERT_TRUE(CreateFile("Foobar"_ns))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  swr->TestDeleteData();
+
+  nsCOMPtr<nsIFile> file = GetFile();
+
+  bool exists;
+  nsresult rv = file->Exists(&exists);
+  ASSERT_EQ(NS_OK, rv) << "nsIFile::Exists cannot fail";
+
+  ASSERT_FALSE(exists)
+  << "The file should not exist after a DeleteData().";
+}
+
+TEST(ServiceWorkerRegistrar, TestWriteData)
+{
+  {
+    RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+    for (int i = 0; i < 2; ++i) {
+      ServiceWorkerRegistrationData reg;
+
+      reg.scope() = nsPrintfCString("https://scope_write_%d.org", i);
+      reg.currentWorkerURL() = nsPrintfCString("currentWorkerURL write %d", i);
+      reg.currentWorkerHandlesFetch() = true;
+      reg.cacheName() =
+          NS_ConvertUTF8toUTF16(nsPrintfCString("cacheName write %d", i));
+      reg.updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      reg.currentWorkerInstalledTime() = PR_Now();
+      reg.currentWorkerActivatedTime() = PR_Now();
+      reg.lastUpdateTime() = PR_Now();
+
+      nsAutoCString spec;
+      spec.AppendPrintf("spec write %d", i);
+
+      reg.principal() = mozilla::ipc::ContentPrincipalInfo(
+          mozilla::OriginAttributes(i % 2), spec, spec, mozilla::Nothing(),
+          spec);
+
+      swr->TestRegisterServiceWorker(reg);
+    }
+
+    nsresult rv = swr->TestWriteData();
+    ASSERT_EQ(NS_OK, rv) << "WriteData() should not fail";
+  }
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  for (int i = 0; i < 2; ++i) {
+    nsAutoCString test;
+
+    ASSERT_EQ(data[i].principal().type(),
+              mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+    const mozilla::ipc::ContentPrincipalInfo& cInfo = data[i].principal();
+
+    mozilla::OriginAttributes attrs(i % 2);
+    nsAutoCString suffix, expectSuffix;
+    attrs.CreateSuffix(expectSuffix);
+    cInfo.attrs().CreateSuffix(suffix);
+
+    ASSERT_STREQ(expectSuffix.get(), suffix.get());
+
+    test.AppendPrintf("https://scope_write_%d.org", i);
+    ASSERT_STREQ(test.get(), cInfo.spec().get());
+
+    test.Truncate();
+    test.AppendPrintf("https://scope_write_%d.org", i);
+    ASSERT_STREQ(test.get(), data[i].scope().get());
+
+    test.Truncate();
+    test.AppendPrintf("currentWorkerURL write %d", i);
+    ASSERT_STREQ(test.get(), data[i].currentWorkerURL().get());
+
+    ASSERT_EQ(true, data[i].currentWorkerHandlesFetch());
+
+    test.Truncate();
+    test.AppendPrintf("cacheName write %d", i);
+    ASSERT_STREQ(test.get(), NS_ConvertUTF16toUTF8(data[i].cacheName()).get());
+
+    ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+              data[i].updateViaCache());
+
+    ASSERT_NE((int64_t)0, data[i].currentWorkerInstalledTime());
+    ASSERT_NE((int64_t)0, data[i].currentWorkerActivatedTime());
+    ASSERT_NE((int64_t)0, data[i].lastUpdateTime());
+  }
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion2Migration)
+{
+  nsAutoCString buffer(
+      "2"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral(
+      "spec 0\nhttps://scope_0.org\nscriptSpec 0\ncurrentWorkerURL "
+      "0\nactiveCache 0\nwaitingCache 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(
+      "spec 1\nhttps://scope_1.org\nscriptSpec 1\ncurrentWorkerURL "
+      "1\nactiveCache 1\nwaitingCache 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_EQ(true, data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("activeCache 0",
+               NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_EQ(true, data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("activeCache 1",
+               NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion3Migration)
+{
+  nsAutoCString buffer(
+      "3"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral(
+      "spec 0\nhttps://scope_0.org\ncurrentWorkerURL 0\ncacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(
+      "spec 1\nhttps://scope_1.org\ncurrentWorkerURL 1\ncacheName 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_EQ(true, data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_EQ(true, data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion4Migration)
+{
+  nsAutoCString buffer(
+      "4"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral(
+      "https://scope_0.org\ncurrentWorkerURL 0\ncacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(
+      "https://scope_1.org\ncurrentWorkerURL 1\ncacheName 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  // default is true
+  ASSERT_EQ(true, data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  // default is true
+  ASSERT_EQ(true, data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion5Migration)
+{
+  nsAutoCString buffer(
+      "5"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral("https://scope_0.org\ncurrentWorkerURL 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TRUE "\n");
+  buffer.AppendLiteral("cacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("https://scope_1.org\ncurrentWorkerURL 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_FALSE "\n");
+  buffer.AppendLiteral("cacheName 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_TRUE(data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_FALSE(data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion6Migration)
+{
+  nsAutoCString buffer(
+      "6"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral("https://scope_0.org\ncurrentWorkerURL 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TRUE "\n");
+  buffer.AppendLiteral("cacheName 0\n");
+  buffer.AppendInt(nsIRequest::LOAD_NORMAL, 16);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("https://scope_1.org\ncurrentWorkerURL 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_FALSE "\n");
+  buffer.AppendLiteral("cacheName 1\n");
+  buffer.AppendInt(nsIRequest::VALIDATE_ALWAYS, 16);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_TRUE(data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_FALSE(data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestVersion7Migration)
+{
+  nsAutoCString buffer(
+      "7"
+      "\n");
+
+  buffer.AppendLiteral("^appId=123&inBrowser=1\n");
+  buffer.AppendLiteral("https://scope_0.org\ncurrentWorkerURL 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TRUE "\n");
+  buffer.AppendLiteral("cacheName 0\n");
+  buffer.AppendInt(nsIRequest::LOAD_NORMAL, 16);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(0);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral("https://scope_1.org\ncurrentWorkerURL 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_FALSE "\n");
+  buffer.AppendLiteral("cacheName 1\n");
+  buffer.AppendInt(nsIRequest::VALIDATE_ALWAYS, 16);
+  buffer.AppendLiteral("\n");
+  PRTime ts = PR_Now();
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendInt(ts);
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_TRUE(data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_FALSE(data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)ts, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)ts, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)ts, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestDedupeRead)
+{
+  nsAutoCString buffer(
+      "3"
+      "\n");
+
+  // unique entries
+  buffer.AppendLiteral("^inBrowser=1\n");
+  buffer.AppendLiteral(
+      "spec 0\nhttps://scope_0.org\ncurrentWorkerURL 0\ncacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(
+      "spec 1\nhttps://scope_1.org\ncurrentWorkerURL 1\ncacheName 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  // dupe entries
+  buffer.AppendLiteral("^inBrowser=1\n");
+  buffer.AppendLiteral(
+      "spec 1\nhttps://scope_0.org\ncurrentWorkerURL 0\ncacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("^inBrowser=1\n");
+  buffer.AppendLiteral(
+      "spec 2\nhttps://scope_0.org\ncurrentWorkerURL 0\ncacheName 0\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  buffer.AppendLiteral("\n");
+  buffer.AppendLiteral(
+      "spec 3\nhttps://scope_1.org\ncurrentWorkerURL 1\ncacheName 1\n");
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR "\n");
+
+  ASSERT_TRUE(CreateFile(buffer))
+  << "CreateFile should not fail";
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)2, data.Length()) << "2 entries should be found";
+
+  const mozilla::ipc::PrincipalInfo& info0 = data[0].principal();
+  ASSERT_EQ(info0.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo0 = data[0].principal();
+
+  nsAutoCString suffix0;
+  cInfo0.attrs().CreateSuffix(suffix0);
+
+  ASSERT_STREQ("^inBrowser=1", suffix0.get());
+  ASSERT_STREQ("https://scope_0.org", cInfo0.spec().get());
+  ASSERT_STREQ("https://scope_0.org", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL 0", data[0].currentWorkerURL().get());
+  ASSERT_EQ(true, data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 0", NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+
+  const mozilla::ipc::PrincipalInfo& info1 = data[1].principal();
+  ASSERT_EQ(info1.type(), mozilla::ipc::PrincipalInfo::TContentPrincipalInfo)
+      << "First principal must be content";
+  const mozilla::ipc::ContentPrincipalInfo& cInfo1 = data[1].principal();
+
+  nsAutoCString suffix1;
+  cInfo1.attrs().CreateSuffix(suffix1);
+
+  ASSERT_STREQ("", suffix1.get());
+  ASSERT_STREQ("https://scope_1.org", cInfo1.spec().get());
+  ASSERT_STREQ("https://scope_1.org", data[1].scope().get());
+  ASSERT_STREQ("currentWorkerURL 1", data[1].currentWorkerURL().get());
+  ASSERT_EQ(true, data[1].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName 1", NS_ConvertUTF16toUTF8(data[1].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[1].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[1].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[1].lastUpdateTime());
+}
+
+TEST(ServiceWorkerRegistrar, TestDedupeWrite)
+{
+  {
+    RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+    for (int i = 0; i < 2; ++i) {
+      ServiceWorkerRegistrationData reg;
+
+      reg.scope() = "https://scope_write.dedupe"_ns;
+      reg.currentWorkerURL() = nsPrintfCString("currentWorkerURL write %d", i);
+      reg.currentWorkerHandlesFetch() = true;
+      reg.cacheName() =
+          NS_ConvertUTF8toUTF16(nsPrintfCString("cacheName write %d", i));
+      reg.updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      nsAutoCString spec;
+      spec.AppendPrintf("spec write dedupe/%d", i);
+
+      reg.principal() = mozilla::ipc::ContentPrincipalInfo(
+          mozilla::OriginAttributes(false), spec, spec, mozilla::Nothing(),
+          spec);
+
+      swr->TestRegisterServiceWorker(reg);
+    }
+
+    nsresult rv = swr->TestWriteData();
+    ASSERT_EQ(NS_OK, rv) << "WriteData() should not fail";
+  }
+
+  RefPtr<ServiceWorkerRegistrarTest> swr = new ServiceWorkerRegistrarTest;
+
+  nsresult rv = swr->TestReadData();
+  ASSERT_EQ(NS_OK, rv) << "ReadData() should not fail";
+
+  // Duplicate entries should be removed.
+  const nsTArray<ServiceWorkerRegistrationData>& data = swr->TestGetData();
+  ASSERT_EQ((uint32_t)1, data.Length()) << "1 entry should be found";
+
+  ASSERT_EQ(data[0].principal().type(),
+            mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+  const mozilla::ipc::ContentPrincipalInfo& cInfo = data[0].principal();
+
+  mozilla::OriginAttributes attrs(false);
+  nsAutoCString suffix, expectSuffix;
+  attrs.CreateSuffix(expectSuffix);
+  cInfo.attrs().CreateSuffix(suffix);
+
+  // Last entry passed to RegisterServiceWorkerInternal() should overwrite
+  // previous values.  So expect "1" in values here.
+  ASSERT_STREQ(expectSuffix.get(), suffix.get());
+  ASSERT_STREQ("https://scope_write.dedupe", cInfo.spec().get());
+  ASSERT_STREQ("https://scope_write.dedupe", data[0].scope().get());
+  ASSERT_STREQ("currentWorkerURL write 1", data[0].currentWorkerURL().get());
+  ASSERT_EQ(true, data[0].currentWorkerHandlesFetch());
+  ASSERT_STREQ("cacheName write 1",
+               NS_ConvertUTF16toUTF8(data[0].cacheName()).get());
+  ASSERT_EQ(nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS,
+            data[0].updateViaCache());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerInstalledTime());
+  ASSERT_EQ((int64_t)0, data[0].currentWorkerActivatedTime());
+  ASSERT_EQ((int64_t)0, data[0].lastUpdateTime());
+}
+
+int main(int argc, char** argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+
+  int rv = RUN_ALL_TESTS();
+  return rv;
+}
diff --git a/dom/serviceworkers/test/gtest/moz.build b/dom/serviceworkers/test/gtest/moz.build
new file mode 100644
index 0000000000..99e2945332
--- /dev/null
+++ b/dom/serviceworkers/test/gtest/moz.build
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES = [
+    "TestReadWrite.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul-gtest"
diff --git a/dom/serviceworkers/test/gzip_redirect_worker.js b/dom/serviceworkers/test/gzip_redirect_worker.js
new file mode 100644
index 0000000000..dcee4b3b18
--- /dev/null
+++ b/dom/serviceworkers/test/gzip_redirect_worker.js
@@ -0,0 +1,15 @@
+self.addEventListener("fetch", function (event) {
+  if (!event.request.url.endsWith("sw_clients/does_not_exist.html")) {
+    return;
+  }
+
+  event.respondWith(
+    new Response("", {
+      status: 301,
+      statusText: "Moved Permanently",
+      headers: {
+        Location: "refresher_compressed.html",
+      },
+    })
+  );
+});
diff --git a/dom/serviceworkers/test/header_checker.sjs b/dom/serviceworkers/test/header_checker.sjs
new file mode 100644
index 0000000000..7061041039
--- /dev/null
+++ b/dom/serviceworkers/test/header_checker.sjs
@@ -0,0 +1,9 @@
+function handleRequest(request, response) {
+  if (request.getHeader("Service-Worker") === "script") {
+    response.setStatusLine("1.1", 200, "OK");
+    response.setHeader("Content-Type", "text/javascript");
+    response.write("// empty");
+  } else {
+    response.setStatusLine("1.1", 404, "Not Found");
+  }
+}
diff --git a/dom/serviceworkers/test/hello.html b/dom/serviceworkers/test/hello.html
new file mode 100644
index 0000000000..97eb03c902
--- /dev/null
+++ b/dom/serviceworkers/test/hello.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+  </head>
+  <body>
+    Hello.
+  </body>
+<html>
diff --git a/dom/serviceworkers/test/importscript.sjs b/dom/serviceworkers/test/importscript.sjs
new file mode 100644
index 0000000000..e075eadd87
--- /dev/null
+++ b/dom/serviceworkers/test/importscript.sjs
@@ -0,0 +1,11 @@
+function handleRequest(request, response) {
+  if (request.queryString == "clearcounter") {
+    setState("counter", "");
+  } else if (!getState("counter")) {
+    response.setHeader("Content-Type", "application/javascript", false);
+    response.write("callByScript();");
+    setState("counter", "1");
+  } else {
+    response.write("no cache no party!");
+  }
+}
diff --git a/dom/serviceworkers/test/importscript_worker.js b/dom/serviceworkers/test/importscript_worker.js
new file mode 100644
index 0000000000..2ade477f63
--- /dev/null
+++ b/dom/serviceworkers/test/importscript_worker.js
@@ -0,0 +1,46 @@
+var counter = 0;
+function callByScript() {
+  ++counter;
+}
+
+// Use multiple scripts in this load to verify we support that case correctly.
+// See bug 1249351 for a case where we broke this.
+importScripts("lorem_script.js", "importscript.sjs");
+
+importScripts("importscript.sjs");
+
+var missingScriptFailed = false;
+try {
+  importScripts(["there-is-nothing-here.js"]);
+} catch (e) {
+  missingScriptFailed = true;
+}
+
+onmessage = function (e) {
+  self.clients.matchAll().then(function (res) {
+    if (!res.length) {
+      dump("ERROR: no clients are currently controlled.\n");
+    }
+
+    if (!missingScriptFailed) {
+      res[0].postMessage("KO");
+    }
+
+    try {
+      // new unique script should fail
+      importScripts(["importscript.sjs?unique=true"]);
+      res[0].postMessage("KO");
+      return;
+    } catch (ex) {}
+
+    try {
+      // duplicate script previously offlined should succeed
+      importScripts(["importscript.sjs"]);
+    } catch (ex) {
+      res[0].postMessage("KO");
+      return;
+    }
+
+    res[0].postMessage(counter == 3 ? "OK" : "KO");
+  });
+};
diff --git a/dom/serviceworkers/test/install_event_error_worker.js b/dom/serviceworkers/test/install_event_error_worker.js
new file mode 100644
index 0000000000..abcceb6b69
--- /dev/null
+++ b/dom/serviceworkers/test/install_event_error_worker.js
@@ -0,0 +1,9 @@
+// Worker that errors on receiving an install event.
+oninstall = function (e) {
+  e.waitUntil(
+    new Promise(function (resolve, reject) {
+      undefined.doSomething;
+      resolve();
+    })
+  );
+};
diff --git a/dom/serviceworkers/test/install_event_worker.js b/dom/serviceworkers/test/install_event_worker.js
new file mode 100644
index 0000000000..3001575189
--- /dev/null
+++ b/dom/serviceworkers/test/install_event_worker.js
@@ -0,0 +1,3 @@
+oninstall = function (e) {
+  dump("Got install event\n");
+};
diff --git a/dom/serviceworkers/test/intercepted_channel_process_swap_worker.js b/dom/serviceworkers/test/intercepted_channel_process_swap_worker.js
new file mode 100644
index 0000000000..ccc74bc895
--- /dev/null
+++ b/dom/serviceworkers/test/intercepted_channel_process_swap_worker.js
@@ -0,0 +1,7 @@
+onfetch = e => {
+  const url = new URL(e.request.url).searchParams.get("respondWith");
+
+  if (url) {
+    e.respondWith(fetch(url));
+  }
+};
diff --git a/dom/serviceworkers/test/isolated/README.md b/dom/serviceworkers/test/isolated/README.md
new file mode 100644
index 0000000000..2b462385af
--- /dev/null
+++ b/dom/serviceworkers/test/isolated/README.md
@@ -0,0 +1,19 @@
+This directory contains tests that are flaky when run with other tests
+but that we don't want to disable and where it's not trivial to make
+the tests not flaky at this time, but we have a plan to fix them via
+systemic fixes that are improving the codebase rather than hacking a
+test until it works.
+
+This directory and ugly hack structure needs to exist because of
+multi-e10s propagation races that will go away when we finish
+implementing the multi-e10s overhaul for ServiceWorkers.  Most
+specifically, unregister() calls need to propagate across all
+content processes.  There are fixes on bug 1318142, but they're
+ugly and complicate things.
+
+Specific test notes and rationalizations:
+- multi-e10s-update: This test relies on there being no registrations
+  existing at its start.  The preceding test that induces the breakage
+  (`browser_force_refresh.js`) was made to clean itself up, but the
+  unregister() race issue is not easily/cleanly hacked around and this
+  test will itself become moot when the multi-e10s changes land.
diff --git a/dom/serviceworkers/test/isolated/multi-e10s-update/browser.toml b/dom/serviceworkers/test/isolated/multi-e10s-update/browser.toml
new file mode 100644
index 0000000000..9bb55cb78c
--- /dev/null
+++ b/dom/serviceworkers/test/isolated/multi-e10s-update/browser.toml
@@ -0,0 +1,8 @@
+[DEFAULT]
+support-files = [
+  "file_multie10s_update.html",
+  "server_multie10s_update.sjs",
+]
+
+["browser_multie10s_update.js"]
+skip-if = ["true"] # bug 1429794 is to re-enable
diff --git a/dom/serviceworkers/test/isolated/multi-e10s-update/browser_multie10s_update.js b/dom/serviceworkers/test/isolated/multi-e10s-update/browser_multie10s_update.js
new file mode 100644
index 0000000000..457d47863c
--- /dev/null
+++ b/dom/serviceworkers/test/isolated/multi-e10s-update/browser_multie10s_update.js
@@ -0,0 +1,147 @@
+"use strict";
+
+// Testing if 2 child processes are correctly managed when they both try to do
+// an SW update.
+
+const BASE_URI =
+  "http://mochi.test:8888/browser/dom/serviceworkers/test/isolated/multi-e10s-update/";
+
+add_task(async function test_update() {
+  info("Setting the prefs to having multi-e10s enabled");
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.ipc.processCount", 4],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  let url = BASE_URI + "file_multie10s_update.html";
+
+  info("Creating the first tab...");
+  let tab1 = BrowserTestUtils.addTab(gBrowser, url);
+  let browser1 = gBrowser.getBrowserForTab(tab1);
+  await BrowserTestUtils.browserLoaded(browser1);
+
+  info("Creating the second tab...");
+  let tab2 = BrowserTestUtils.addTab(gBrowser, url);
+  let browser2 = gBrowser.getBrowserForTab(tab2);
+  await BrowserTestUtils.browserLoaded(browser2);
+
+  let sw = BASE_URI + "server_multie10s_update.sjs";
+
+  info("Let's make sure there are no existing registrations...");
+  let existingCount = await SpecialPowers.spawn(
+    browser1,
+    [],
+    async function () {
+      const regs = await content.navigator.serviceWorker.getRegistrations();
+      return regs.length;
+    }
+  );
+  is(existingCount, 0, "Previous tests should have cleaned up!");
+
+  info("Let's start the test...");
+  /* eslint-disable no-shadow */
+  let status = await SpecialPowers.spawn(browser1, [sw], function (url) {
+    // Let the SW be served immediately once by triggering a relase immediately.
+    // We don't need to await this.  We do this from a frame script because
+    // it has fetch.
+    content.fetch(url + "?release");
+
+    // Registration of the SW
+    return (
+      content.navigator.serviceWorker
+        .register(url)
+
+        // Activation
+        .then(function (r) {
+          content.registration = r;
+          return new content.window.Promise(resolve => {
+            let worker = r.installing;
+            worker.addEventListener("statechange", () => {
+              if (worker.state === "installed") {
+                resolve(true);
+              }
+            });
+          });
+        })
+
+        // Waiting for the result.
+        .then(() => {
+          return new content.window.Promise(resolveResults => {
+            // Once both updates have been issued and a single update has failed, we
+            // can tell the .sjs to release a single copy of the SW script.
+            let updateCount = 0;
+            const uc = new content.window.BroadcastChannel("update");
+            // This promise tracks the updates tally.
+            const updatesIssued = new Promise(resolveUpdatesIssued => {
+              uc.onmessage = function (e) {
+                updateCount++;
+                console.log("got update() number", updateCount);
+                if (updateCount === 2) {
+                  resolveUpdatesIssued();
+                }
+              };
+            });
+
+            let results = [];
+            const rc = new content.window.BroadcastChannel("result");
+            // This promise resolves when an update has failed.
+            const oneFailed = new Promise(resolveOneFailed => {
+              rc.onmessage = function (e) {
+                console.log("got result", e.data);
+                results.push(e.data);
+                if (e.data === 1) {
+                  resolveOneFailed();
+                }
+                if (results.length != 2) {
+                  return;
+                }
+
+                resolveResults(results[0] + results[1]);
+              };
+            });
+
+            Promise.all([updatesIssued, oneFailed]).then(() => {
+              console.log("releasing update");
+              content.fetch(url + "?release").catch(ex => {
+                console.error("problem releasing:", ex);
+              });
+            });
+
+            // Let's inform the tabs.
+            const sc = new content.window.BroadcastChannel("start");
+            sc.postMessage("go");
+          });
+        })
+    );
+  });
+  /* eslint-enable no-shadow */
+
+  if (status == 0) {
+    ok(false, "both succeeded. This is wrong.");
+  } else if (status == 1) {
+    ok(true, "one succeded, one failed. This is good.");
+  } else {
+    ok(false, "both failed. This is definitely wrong.");
+  }
+
+  // let's clean up the registration and get the fetch count.  The count
+  // should be 1 for the initial fetch and 1 for the update.
+  /* eslint-disable no-shadow */
+  const count = await SpecialPowers.spawn(browser1, [sw], async function (url) {
+    // We stored the registration on the frame script's wrapper, hence directly
+    // accesss content without using wrappedJSObject.
+    await content.registration.unregister();
+    const { count } = await content
+      .fetch(url + "?get-and-clear-count")
+      .then(r => r.json());
+    return count;
+  });
+  /* eslint-enable no-shadow */
+  is(count, 2, "SW should have been fetched only twice");
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});
diff --git a/dom/serviceworkers/test/isolated/multi-e10s-update/file_multie10s_update.html b/dom/serviceworkers/test/isolated/multi-e10s-update/file_multie10s_update.html
new file mode 100644
index 0000000000..d611b01b59
--- /dev/null
+++ b/dom/serviceworkers/test/isolated/multi-e10s-update/file_multie10s_update.html
@@ -0,0 +1,40 @@
+<html>
+<body>
+<script>
+
+var bc = new BroadcastChannel('start');
+bc.onmessage = function(e) {
+  // This message is not for us.
+  if (e.data != 'go') {
+    return;
+  }
+
+  // It can happen that we don't have the registrations yet. Let's try with a
+  // timeout.
+  function proceed() {
+    return navigator.serviceWorker.getRegistrations().then(regs => {
+      if (!regs.length) {
+        setTimeout(proceed, 200);
+        return;
+      }
+
+      bc = new BroadcastChannel('result');
+      regs[0].update().then(() => {
+        bc.postMessage(0);
+      }, () => {
+        bc.postMessage(1);
+      });
+
+      // Tell the coordinating frame script that we've kicked off our update
+      // call so that the SW script can be released once both instances of us
+      // have triggered update() and 1 has failed.
+      const blockingChannel = new BroadcastChannel('update');
+      blockingChannel.postMessage(true);
+    });
+  }
+
+  proceed();
+}
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/isolated/multi-e10s-update/server_multie10s_update.sjs b/dom/serviceworkers/test/isolated/multi-e10s-update/server_multie10s_update.sjs
new file mode 100644
index 0000000000..186c9ebc7d
--- /dev/null
+++ b/dom/serviceworkers/test/isolated/multi-e10s-update/server_multie10s_update.sjs
@@ -0,0 +1,99 @@
+// stolen from file_blocked_script.sjs
+function setGlobalState(data, key) {
+  x = {
+    data,
+    QueryInterface(iid) {
+      return this;
+    },
+  };
+  x.wrappedJSObject = x;
+  setObjectState(key, x);
+}
+
+function getGlobalState(key) {
+  var data;
+  getObjectState(key, function (x) {
+    data = x && x.wrappedJSObject.data;
+  });
+  return data;
+}
+
+function completeBlockingRequest(response) {
+  response.write("42");
+  response.finish();
+}
+
+// This stores the response that's currently blocking, or true if the release
+// got here before the blocking request.
+const BLOCKING_KEY = "multie10s-update-release";
+// This tracks the number of blocking requests we received up to this point in
+// time.  This value will be cleared when fetched.  It's on the caller to make
+// sure that all the blocking requests that might occurr have already occurred.
+const COUNT_KEY = "multie10s-update-count";
+
+/**
+ * Serve a request that will only be completed when the ?release variant of this
+ * .sjs is fetched.  This allows us to avoid using a timer, which slows down the
+ * tests and is brittle under slow hardware.
+ */
+function handleBlockingRequest(request, response) {
+  response.processAsync();
+  response.setHeader("Content-Type", "application/javascript", false);
+
+  const existingCount = getGlobalState(COUNT_KEY) || 0;
+  setGlobalState(existingCount + 1, COUNT_KEY);
+
+  const alreadyReleased = getGlobalState(BLOCKING_KEY);
+  if (alreadyReleased === true) {
+    completeBlockingRequest(response);
+    setGlobalState(null, BLOCKING_KEY);
+  } else if (alreadyReleased) {
+    // If we've got another response stacked up, this means something is wrong
+    // with the test.  The count mechanism will detect this, so just let this
+    // one through so we fail fast rather than hanging.
+    dump("we got multiple blocking requests stacked up!!\n");
+    completeBlockingRequest(response);
+  } else {
+    setGlobalState(response, BLOCKING_KEY);
+  }
+}
+
+function handleReleaseRequest(request, response) {
+  const blockingResponse = getGlobalState(BLOCKING_KEY);
+  if (blockingResponse) {
+    completeBlockingRequest(blockingResponse);
+    setGlobalState(null, BLOCKING_KEY);
+  } else {
+    setGlobalState(true, BLOCKING_KEY);
+  }
+
+  response.setHeader("Content-Type", "application/json", false);
+  response.write(JSON.stringify({ released: true }));
+}
+
+function handleCountRequest(request, response) {
+  const count = getGlobalState(COUNT_KEY) || 0;
+  // --verify requires that we clear this so the test can be re-run.
+  setGlobalState(0, COUNT_KEY);
+
+  response.setHeader("Content-Type", "application/json", false);
+  response.write(JSON.stringify({ count }));
+}
+
+function handleRequest(request, response) {
+  dump(
+    "server_multie10s_update.sjs: processing request for " +
+      request.path +
+      "?" +
+      request.queryString +
+      "\n"
+  );
+  const query = new URLSearchParams(request.queryString);
+  if (query.has("release")) {
+    handleReleaseRequest(request, response);
+  } else if (query.has("get-and-clear-count")) {
+    handleCountRequest(request, response);
+  } else {
+    handleBlockingRequest(request, response);
+  }
+}
diff --git a/dom/serviceworkers/test/lazy_worker.js b/dom/serviceworkers/test/lazy_worker.js
new file mode 100644
index 0000000000..6f8681d25c
--- /dev/null
+++ b/dom/serviceworkers/test/lazy_worker.js
@@ -0,0 +1,8 @@
+onactivate = function (event) {
+  var promise = new Promise(function (res) {
+    setTimeout(function () {
+      res();
+    }, 500);
+  });
+  event.waitUntil(promise);
+};
diff --git a/dom/serviceworkers/test/lorem_script.js b/dom/serviceworkers/test/lorem_script.js
new file mode 100644
index 0000000000..bc8f3c8085
--- /dev/null
+++ b/dom/serviceworkers/test/lorem_script.js
@@ -0,0 +1,8 @@
+var lorem_str = `
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
+incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis
+nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
+consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum
+dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident,
+sunt in culpa qui officia deserunt mollit anim id est laborum.
+`;
diff --git a/dom/serviceworkers/test/match_all_advanced_worker.js b/dom/serviceworkers/test/match_all_advanced_worker.js
new file mode 100644
index 0000000000..7aa623161a
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_advanced_worker.js
@@ -0,0 +1,5 @@
+onmessage = function (e) {
+  self.clients.matchAll().then(function (clients) {
+    e.source.postMessage(clients.length);
+  });
+};
diff --git a/dom/serviceworkers/test/match_all_client/match_all_client_id.html b/dom/serviceworkers/test/match_all_client/match_all_client_id.html
new file mode 100644
index 0000000000..7ac6fc9d05
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_client/match_all_client_id.html
@@ -0,0 +1,31 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1139425 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var testWindow = parent;
+  if (opener) {
+    testWindow = opener;
+  }
+
+  window.onload = function() {
+    navigator.serviceWorker.ready.then(function(swr) {
+        swr.active.postMessage("Start");
+    });
+  }
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    // worker message;
+    testWindow.postMessage(msg.data, "*");
+    window.close();
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/match_all_client_id_worker.js b/dom/serviceworkers/test/match_all_client_id_worker.js
new file mode 100644
index 0000000000..607eec97d4
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_client_id_worker.js
@@ -0,0 +1,28 @@
+onmessage = function (e) {
+  dump("MatchAllClientIdWorker:" + e.data + "\n");
+  var id = [];
+  var iterations = 5;
+  var counter = 0;
+
+  for (var i = 0; i < iterations; i++) {
+    self.clients.matchAll().then(function (res) {
+      if (!res.length) {
+        dump("ERROR: no clients are currently controlled.\n");
+      }
+
+      client = res[0];
+      id[counter] = client.id;
+      counter++;
+      if (counter >= iterations) {
+        var response = true;
+        for (var index = 1; index < iterations; index++) {
+          if (id[0] != id[index]) {
+            response = false;
+            break;
+          }
+        }
+        client.postMessage(response);
+      }
+    });
+  }
+};
diff --git a/dom/serviceworkers/test/match_all_clients/match_all_controlled.html b/dom/serviceworkers/test/match_all_clients/match_all_controlled.html
new file mode 100644
index 0000000000..35f064815d
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_clients/match_all_controlled.html
@@ -0,0 +1,83 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1058311 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var re = /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/;
+  var frameType = "none";
+  var testWindow = parent;
+
+  if (parent != window) {
+    frameType = "nested";
+  } else if (opener) {
+    frameType = "auxiliary";
+    testWindow = opener;
+  } else if (parent == window) {
+    frameType = "top-level";
+  } else {
+    postResult(false, "Unexpected frameType");
+  }
+
+  window.onload = function() {
+    navigator.serviceWorker.ready.then(function(swr) {
+        // Send a message to our SW that will cause it to do clients.matchAll()
+        // and send a message *to each client about themselves* (rather than
+        // replying directly to us with all the clients it finds).
+        swr.active.postMessage("Start");
+    });
+  }
+
+  function postResult(result, msg) {
+    response = {
+      result,
+      message: msg
+    };
+
+    testWindow.postMessage(response, "*");
+  }
+
+  navigator.serviceWorker.onmessage = async function(msg) {
+    // ## Verify the contents of the SW's serialized rep of our client info.
+    // Clients are opaque identifiers at a spec level, but we want to verify
+    // that they are UUID's *without wrapping "{}" characters*.
+    result = re.test(msg.data.id);
+    postResult(result, "Client id test");
+
+    result = msg.data.url == window.location;
+    postResult(result, "Client url test");
+
+    result = msg.data.visibilityState === document.visibilityState;
+    postResult(result, "Client visibility test. expected=" +document.visibilityState);
+
+    result = msg.data.focused === document.hasFocus();
+    postResult(result, "Client focus test. expected=" + document.hasFocus());
+
+    result = msg.data.frameType === frameType;
+    postResult(result, "Client frameType test. expected=" + frameType);
+
+    result = msg.data.type === "window";
+    postResult(result, "Client type test. expected=window");
+
+    // ## Verify the FetchEvent.clientId
+    // In bug 1446225 it turned out we provided UUID's wrapped with {}'s.  We
+    // now also get coverage by forcing our clients.get() to forbid UUIDs
+    // with that form.
+
+    const clientIdResp = await fetch('clientId');
+    const fetchClientId = await clientIdResp.text();
+    result = re.test(fetchClientId);
+    postResult(result, "Fetch clientId test");
+
+    postResult(true, "DONE");
+    window.close();
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/match_all_properties_worker.js b/dom/serviceworkers/test/match_all_properties_worker.js
new file mode 100644
index 0000000000..f07a44e233
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_properties_worker.js
@@ -0,0 +1,27 @@
+onfetch = function (e) {
+  if (/\/clientId$/.test(e.request.url)) {
+    e.respondWith(new Response(e.clientId));
+  }
+};
+
+onmessage = function (e) {
+  dump("MatchAllPropertiesWorker:" + e.data + "\n");
+  self.clients.matchAll().then(function (res) {
+    if (!res.length) {
+      dump("ERROR: no clients are currently controlled.\n");
+    }
+
+    for (i = 0; i < res.length; i++) {
+      client = res[i];
+      response = {
+        type: client.type,
+        id: client.id,
+        url: client.url,
+        visibilityState: client.visibilityState,
+        focused: client.focused,
+        frameType: client.frameType,
+      };
+      client.postMessage(response);
+    }
+  });
+};
diff --git a/dom/serviceworkers/test/match_all_worker.js b/dom/serviceworkers/test/match_all_worker.js
new file mode 100644
index 0000000000..99b11c850d
--- /dev/null
+++ b/dom/serviceworkers/test/match_all_worker.js
@@ -0,0 +1,10 @@
+function loop() {
+  self.clients.matchAll().then(function (result) {
+    setTimeout(loop, 0);
+  });
+}
+
+onactivate = function (e) {
+  // spam matchAll until the worker is closed.
+  loop();
+};
diff --git a/dom/serviceworkers/test/message_posting_worker.js b/dom/serviceworkers/test/message_posting_worker.js
new file mode 100644
index 0000000000..5fcd0a741e
--- /dev/null
+++ b/dom/serviceworkers/test/message_posting_worker.js
@@ -0,0 +1,8 @@
+onmessage = function (e) {
+  self.clients.matchAll().then(function (res) {
+    if (!res.length) {
+      dump("ERROR: no clients are currently controlled.\n");
+    }
+    res[0].postMessage(e.data);
+  });
+};
diff --git a/dom/serviceworkers/test/message_receiver.html b/dom/serviceworkers/test/message_receiver.html
new file mode 100644
index 0000000000..82cb587c72
--- /dev/null
+++ b/dom/serviceworkers/test/message_receiver.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<script>
+  navigator.serviceWorker.onmessage = function(e) {
+    window.parent.postMessage(e.data, "*");
+  };
+</script>
diff --git a/dom/serviceworkers/test/mochitest-common.toml b/dom/serviceworkers/test/mochitest-common.toml
new file mode 100644
index 0000000000..94badb117f
--- /dev/null
+++ b/dom/serviceworkers/test/mochitest-common.toml
@@ -0,0 +1,494 @@
+[DEFAULT]
+tags = "condprof"
+support-files = [
+  "abrupt_completion_worker.js",
+  "worker.js",
+  "worker2.js",
+  "worker3.js",
+  "fetch_event_worker.js",
+  "parse_error_worker.js",
+  "activate_event_error_worker.js",
+  "install_event_worker.js",
+  "install_event_error_worker.js",
+  "simpleregister/index.html",
+  "simpleregister/ready.html",
+  "controller/index.html",
+  "unregister/index.html",
+  "unregister/unregister.html",
+  "workerUpdate/update.html",
+  "sw_clients/simple.html",
+  "sw_clients/service_worker_controlled.html",
+  "match_all_worker.js",
+  "match_all_advanced_worker.js",
+  "worker_unregister.js",
+  "worker_update.js",
+  "message_posting_worker.js",
+  "fetch/index.html",
+  "fetch/fetch_worker_script.js",
+  "fetch/fetch_tests.js",
+  "fetch/deliver-gzip.sjs",
+  "fetch/redirect.sjs",
+  "fetch/real-file.txt",
+  "fetch/cookie/cookie_test.js",
+  "fetch/cookie/register.html",
+  "fetch/cookie/unregister.html",
+  "fetch/hsts/hsts_test.js",
+  "fetch/hsts/embedder.html",
+  "fetch/hsts/image.html",
+  "fetch/hsts/image-20px.png",
+  "fetch/hsts/image-40px.png",
+  "fetch/hsts/realindex.html",
+  "fetch/hsts/register.html",
+  "fetch/hsts/register.html^headers^",
+  "fetch/hsts/unregister.html",
+  "fetch/https/index.html",
+  "fetch/https/register.html",
+  "fetch/https/unregister.html",
+  "fetch/https/https_test.js",
+  "fetch/https/clonedresponse/index.html",
+  "fetch/https/clonedresponse/register.html",
+  "fetch/https/clonedresponse/unregister.html",
+  "fetch/https/clonedresponse/https_test.js",
+  "fetch/imagecache/image-20px.png",
+  "fetch/imagecache/image-40px.png",
+  "fetch/imagecache/imagecache_test.js",
+  "fetch/imagecache/index.html",
+  "fetch/imagecache/postmortem.html",
+  "fetch/imagecache/register.html",
+  "fetch/imagecache/unregister.html",
+  "fetch/imagecache-maxage/index.html",
+  "fetch/imagecache-maxage/image-20px.png",
+  "fetch/imagecache-maxage/image-40px.png",
+  "fetch/imagecache-maxage/maxage_test.js",
+  "fetch/imagecache-maxage/register.html",
+  "fetch/imagecache-maxage/unregister.html",
+  "fetch/importscript-mixedcontent/register.html",
+  "fetch/importscript-mixedcontent/unregister.html",
+  "fetch/importscript-mixedcontent/https_test.js",
+  "fetch/interrupt.sjs",
+  "fetch/origin/index.sjs",
+  "fetch/origin/index-to-https.sjs",
+  "fetch/origin/realindex.html",
+  "fetch/origin/realindex.html^headers^",
+  "fetch/origin/register.html",
+  "fetch/origin/unregister.html",
+  "fetch/origin/origin_test.js",
+  "fetch/origin/https/index-https.sjs",
+  "fetch/origin/https/realindex.html",
+  "fetch/origin/https/realindex.html^headers^",
+  "fetch/origin/https/register.html",
+  "fetch/origin/https/unregister.html",
+  "fetch/origin/https/origin_test.js",
+  "fetch/requesturl/index.html",
+  "fetch/requesturl/redirect.sjs",
+  "fetch/requesturl/redirector.html",
+  "fetch/requesturl/register.html",
+  "fetch/requesturl/requesturl_test.js",
+  "fetch/requesturl/secret.html",
+  "fetch/requesturl/unregister.html",
+  "fetch/sandbox/index.html",
+  "fetch/sandbox/intercepted_index.html",
+  "fetch/sandbox/register.html",
+  "fetch/sandbox/unregister.html",
+  "fetch/sandbox/sandbox_test.js",
+  "fetch/upgrade-insecure/upgrade-insecure_test.js",
+  "fetch/upgrade-insecure/embedder.html",
+  "fetch/upgrade-insecure/embedder.html^headers^",
+  "fetch/upgrade-insecure/image.html",
+  "fetch/upgrade-insecure/image-20px.png",
+  "fetch/upgrade-insecure/image-40px.png",
+  "fetch/upgrade-insecure/realindex.html",
+  "fetch/upgrade-insecure/register.html",
+  "fetch/upgrade-insecure/unregister.html",
+  "match_all_properties_worker.js",
+  "match_all_clients/match_all_controlled.html",
+  "test_serviceworker_interfaces.js",
+  "serviceworker_wrapper.js",
+  "message_receiver.html",
+  "serviceworker_not_sharedworker.js",
+  "match_all_client/match_all_client_id.html",
+  "match_all_client_id_worker.js",
+  "source_message_posting_worker.js",
+  "scope/scope_worker.js",
+  "redirect_serviceworker.sjs",
+  "importscript.sjs",
+  "importscript_worker.js",
+  "bug1151916_worker.js",
+  "bug1151916_driver.html",
+  "bug1240436_worker.js",
+  "notificationclick.html",
+  "notificationclick-otherwindow.html",
+  "notificationclick.js",
+  "notificationclick_focus.html",
+  "notificationclick_focus.js",
+  "notificationclose.html",
+  "notificationclose.js",
+  "worker_updatefoundevent.js",
+  "worker_updatefoundevent2.js",
+  "updatefoundevent.html",
+  "empty.html",
+  "empty.js",
+  "notification_constructor_error.js",
+  "notification_get_sw.js",
+  "notification/register.html",
+  "sanitize/frame.html",
+  "sanitize/register.html",
+  "sanitize/example_check_and_unregister.html",
+  "sanitize_worker.js",
+  "streamfilter_server.sjs",
+  "streamfilter_worker.js",
+  "swa/worker_scope_different.js",
+  "swa/worker_scope_different.js^headers^",
+  "swa/worker_scope_different2.js",
+  "swa/worker_scope_different2.js^headers^",
+  "swa/worker_scope_precise.js",
+  "swa/worker_scope_precise.js^headers^",
+  "swa/worker_scope_too_deep.js",
+  "swa/worker_scope_too_deep.js^headers^",
+  "swa/worker_scope_too_narrow.js",
+  "swa/worker_scope_too_narrow.js^headers^",
+  "claim_oninstall_worker.js",
+  "claim_worker_1.js",
+  "claim_worker_2.js",
+  "claim_clients/client.html",
+  "force_refresh_worker.js",
+  "sw_clients/refresher.html",
+  "sw_clients/refresher_compressed.html",
+  "sw_clients/refresher_compressed.html^headers^",
+  "sw_clients/refresher_cached.html",
+  "sw_clients/refresher_cached_compressed.html",
+  "sw_clients/refresher_cached_compressed.html^headers^",
+  "strict_mode_warning.js",
+  "skip_waiting_installed_worker.js",
+  "skip_waiting_scope/index.html",
+  "thirdparty/iframe1.html",
+  "thirdparty/iframe2.html",
+  "thirdparty/register.html",
+  "thirdparty/unregister.html",
+  "thirdparty/sw.js",
+  "thirdparty/worker.js",
+  "register_https.html",
+  "gzip_redirect_worker.js",
+  "sw_clients/navigator.html",
+  "eval_worker.js",
+  "test_eval_allowed.html^headers^",
+  "opaque_intercept_worker.js",
+  "notify_loaded.js",
+  "fetch/plugin/worker.js",
+  "fetch/plugin/plugins.html",
+  "eventsource/*",
+  "sw_clients/file_blob_upload_frame.html",
+  "redirect_post.sjs",
+  "xslt_worker.js",
+  "xslt/*",
+  "unresolved_fetch_worker.js",
+  "header_checker.sjs",
+  "openWindow_worker.js",
+  "redirect.sjs",
+  "open_window/client.sjs",
+  "lorem_script.js",
+  "file_blob_response_worker.js",
+  "file_js_cache_cleanup.js",
+  "file_js_cache.html",
+  "file_js_cache_with_sri.html",
+  "file_js_cache.js",
+  "file_js_cache_save_after_load.html",
+  "file_js_cache_save_after_load.js",
+  "file_js_cache_syntax_error.html",
+  "file_js_cache_syntax_error.js",
+  "!/dom/security/test/cors/file_CrossSiteXHR_server.sjs",
+  "!/dom/notification/test/mochitest/MockServices.js",
+  "!/dom/notification/test/mochitest/NotificationTest.js",
+  "blocking_install_event_worker.js",
+  "sw_bad_mime_type.js",
+  "sw_bad_mime_type.js^headers^",
+  "error_reporting_helpers.js",
+  "fetch.js",
+  "hello.html",
+  "create_another_sharedWorker.html",
+  "sharedWorker_fetch.js",
+  "async_waituntil_worker.js",
+  "lazy_worker.js",
+  "nofetch_handler_worker.js",
+  "service_worker.js",
+  "service_worker_client.html",
+  "utils.js",
+  "sw_storage_not_allow.js",
+  "update_worker.sjs",
+  "self_update_worker.sjs",
+  "!/dom/events/test/event_leak_utils.js",
+  "onmessageerror_worker.js",
+  "pref/fetch_nonexistent_file.html",
+  "pref/intercept_nonexistent_file_sw.js",
+]
+
+["test_abrupt_completion.html"]
+skip-if = ["os == 'linux'"] # Bug 1615164
+
+["test_async_waituntil.html"]
+
+["test_bad_script_cache.html"]
+
+["test_bug1151916.html"]
+
+["test_bug1240436.html"]
+
+["test_bug1408734.html"]
+
+["test_claim.html"]
+
+["test_claim_oninstall.html"]
+
+["test_controller.html"]
+
+["test_cross_origin_url_after_redirect.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_devtools_bypass_serviceworker.html"]
+
+["test_empty_serviceworker.html"]
+
+["test_enabled_pref.html"]
+
+["test_error_reporting.html"]
+skip-if = ["serviceworker_e10s"]
+
+["test_escapedSlashes.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_eval_allowed.html"]
+
+["test_event_listener_leaks.html"]
+
+["test_fetch_event.html"]
+skip-if = ["debug"] # Bug 1262224
+
+["test_fetch_event_with_thirdpartypref.html"]
+skip-if = ["debug"] # Bug 1262224
+
+["test_fetch_integrity.html"]
+skip-if = ["serviceworker_e10s"]
+support-files = [
+  "console_monitor.js",
+]
+
+["test_file_blob_response.html"]
+
+["test_file_blob_upload.html"]
+
+["test_file_upload.html"]
+skip-if = ["os == 'android'"] #Bug 1430182
+support-files = [
+  "script_file_upload.js",
+  "sw_file_upload.js",
+  "server_file_upload.sjs",
+]
+
+["test_force_refresh.html"]
+
+["test_gzip_redirect.html"]
+
+["test_hsts_upgrade_intercept.html"]
+skip-if = [
+  "win11_2009 && !debug", # Bug 1797751
+  "os == 'linux' && bits == 64 && debug", # Bug 1749068
+  "apple_catalina && !debug", # Bug 1717091
+]
+scheme = "https"
+
+["test_imagecache.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_imagecache_max_age.html"]
+skip-if = [
+  "os == 'linux' && bits == 64 && !debug && asan && os_version == '18.04'", # Bug 1585668
+  "display == 'wayland' && os_version == '22.04' && debug",  # Bug 1856980
+  "http3",
+  "http2",
+]
+
+["test_importscript.html"]
+
+["test_install_event.html"]
+
+["test_install_event_gc.html"]
+skip-if = ["xorigin"] # JavaScript error: http://mochi.xorigin-test:8888/tests/SimpleTest/TestRunner.js, line 157: SecurityError: Permission denied to access property "wrappedJSObject" on cross-origin object
+
+["test_installation_simple.html"]
+
+["test_match_all.html"]
+
+["test_match_all_advanced.html"]
+
+["test_match_all_client_id.html"]
+skip-if = [
+  "os == 'android'",
+  "http3",
+  "http2",
+]
+
+["test_match_all_client_properties.html"]
+skip-if = ["os == 'android'"]
+
+["test_navigationPreload_disable_crash.html"]
+scheme = "https"
+skip-if = ["os == 'linux' && bits == 64 && debug"] # Bug 1749068
+
+["test_navigator.html"]
+
+["test_nofetch_handler.html"]
+
+["test_not_intercept_plugin.html"]
+skip-if = ["serviceworker_e10s"] # leaks InterceptedHttpChannel and others things
+
+["test_notification_constructor_error.html"]
+
+["test_notification_get.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_notification_openWindow.html"]
+skip-if = [
+  "os == 'android'",  # Bug 1620052
+  "xorigin",  # JavaScript error: http://mochi.xorigin-test:8888/tests/SimpleTest/TestRunner.js, line 157: SecurityError: Permission denied to access property "wrappedJSObject" on cross-origin object
+  "http3",
+  "http2",
+]
+support-files = [
+  "notification_openWindow_worker.js",
+  "file_notification_openWindow.html",
+]
+tags = "openwindow"
+
+["test_notificationclick-otherwindow.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_notificationclick.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_notificationclick_focus.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_notificationclose.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_onmessageerror.html"]
+skip-if = ["xorigin"] # Bug 1792790
+
+["test_opaque_intercept.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_origin_after_redirect.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_origin_after_redirect_cached.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_origin_after_redirect_to_https.html"]
+
+["test_origin_after_redirect_to_https_cached.html"]
+
+["test_post_message.html"]
+
+["test_post_message_advanced.html"]
+
+["test_post_message_source.html"]
+
+["test_register_base.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_register_https_in_http.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_sandbox_intercept.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_sanitize.html"]
+
+["test_scopes.html"]
+
+["test_script_loader_intercepted_js_cache.html"]
+skip-if = ["serviceworker_e10s"]
+
+["test_self_update_worker.html"]
+skip-if = [
+  "serviceworker_e10s",
+  "os == 'android'",
+]
+
+["test_service_worker_allowed.html"]
+
+["test_serviceworker.html"]
+
+["test_serviceworker_header.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_serviceworker_interfaces.html"]
+
+["test_serviceworker_not_sharedworker.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_skip_waiting.html"]
+
+["test_streamfilter.html"]
+
+["test_strict_mode_warning.html"]
+
+["test_third_party_iframes.html"]
+support-files = [
+  "window_party_iframes.html",
+]
+
+["test_unregister.html"]
+
+["test_unresolved_fetch_interception.html"]
+skip-if = [
+  "verify",
+  "serviceworker_e10s",
+]
+
+["test_workerUnregister.html"]
+
+["test_workerUpdate.html"]
+
+["test_worker_reference_gc_timeout.html"]
+
+["test_workerupdatefoundevent.html"]
+
+["test_xslt.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
diff --git a/dom/serviceworkers/test/mochitest-dFPI.toml b/dom/serviceworkers/test/mochitest-dFPI.toml
new file mode 100644
index 0000000000..1fcbda03cf
--- /dev/null
+++ b/dom/serviceworkers/test/mochitest-dFPI.toml
@@ -0,0 +1,10 @@
+[DEFAULT]
+# Enable dFPI(cookieBehavior 5) for service worker tests.
+prefs = ["network.cookie.cookieBehavior=5"]
+tags = "serviceworker-dfpi"
+# We disable service workers for third-party contexts when dFPI is enabled. So,
+# we disable xorigin tests for dFPI.
+skip-if = ["xorigin"]
+dupe-manifest = true
+
+["include:mochitest-common.toml"]
diff --git a/dom/serviceworkers/test/mochitest.toml b/dom/serviceworkers/test/mochitest.toml
new file mode 100644
index 0000000000..13faa300c5
--- /dev/null
+++ b/dom/serviceworkers/test/mochitest.toml
@@ -0,0 +1,56 @@
+[DEFAULT]
+# Mochitests are executed in iframes. Several ServiceWorker tests use iframes
+# too. The result is that we have nested iframes. CookieBehavior 4
+# (BEHAVIOR_REJECT_TRACKER) doesn't grant storage access permission to nested
+# iframes because trackers could use them to follow users across sites. Let's
+# use cookieBehavior 0 (BEHAVIOR_ACCEPT) here.
+prefs = ["network.cookie.cookieBehavior=0"]
+dupe-manifest = true
+tags = "condprof"
+
+# Following tests are not working currently when dFPI is enabled. So, we put
+# these tests here instead of mochitest-common.toml so that these tests won't run
+# when dFPI is enabled.
+
+["include:mochitest-common.toml"]
+
+["test_cookie_fetch.html"]
+
+["test_csp_upgrade-insecure_intercept.html"]
+
+["test_eventsource_intercept.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_https_fetch.html"]
+skip-if = ["condprof"]  #: timed out
+
+["test_https_fetch_cloned_response.html"]
+
+["test_https_origin_after_redirect.html"]
+
+["test_https_origin_after_redirect_cached.html"]
+skip-if = ["condprof"]  #: timed out
+
+["test_https_synth_fetch_from_cached_sw.html"]
+
+["test_importscript_mixedcontent.html"]
+tags = "mcb"
+
+["test_openWindow.html"]
+skip-if = [
+  "os == 'android'", # Bug 1620052
+  "xorigin", # Bug 1792790
+  "condprof",  #: timed out
+  "http3",
+  "http2",
+]
+tags = "openwindow"
+
+["test_sanitize_domain.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
diff --git a/dom/serviceworkers/test/navigationPreload_page.html b/dom/serviceworkers/test/navigationPreload_page.html
new file mode 100644
index 0000000000..39d4a79378
--- /dev/null
+++ b/dom/serviceworkers/test/navigationPreload_page.html
@@ -0,0 +1 @@
+NavigationPreload
diff --git a/dom/serviceworkers/test/network_with_utils.html b/dom/serviceworkers/test/network_with_utils.html
new file mode 100644
index 0000000000..63f6b0e796
--- /dev/null
+++ b/dom/serviceworkers/test/network_with_utils.html
@@ -0,0 +1,14 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="utils.js" type="text/javascript"></script>
+</head>
+<body>
+NETWORK
+</body>
+</html>
diff --git a/dom/serviceworkers/test/nofetch_handler_worker.js b/dom/serviceworkers/test/nofetch_handler_worker.js
new file mode 100644
index 0000000000..0e406b3761
--- /dev/null
+++ b/dom/serviceworkers/test/nofetch_handler_worker.js
@@ -0,0 +1,14 @@
+function handleFetch(event) {
+  event.respondWith(new Response("intercepted"));
+}
+
+self.oninstall = function (event) {
+  addEventListener("fetch", handleFetch);
+  self.onfetch = handleFetch;
+};
+
+// Bug 1325101. Make sure adding event listeners for other events
+// doesn't set the fetch flag.
+addEventListener("push", function () {});
+addEventListener("message", function () {});
+addEventListener("non-sw-event", function () {});
diff --git a/dom/serviceworkers/test/notification/register.html b/dom/serviceworkers/test/notification/register.html
new file mode 100644
index 0000000000..b7df73bede
--- /dev/null
+++ b/dom/serviceworkers/test/notification/register.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<script>
+  function done() {
+    parent.callback();
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("../notification_get_sw.js", {scope: "."}).catch(function(e) {
+    dump("Registration failure " + e.message + "\n");
+  });
+</script>
diff --git a/dom/serviceworkers/test/notification_constructor_error.js b/dom/serviceworkers/test/notification_constructor_error.js
new file mode 100644
index 0000000000..644dba480e
--- /dev/null
+++ b/dom/serviceworkers/test/notification_constructor_error.js
@@ -0,0 +1 @@
+new Notification("Hi there");
diff --git a/dom/serviceworkers/test/notification_get_sw.js b/dom/serviceworkers/test/notification_get_sw.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/notification_get_sw.js
diff --git a/dom/serviceworkers/test/notification_openWindow_worker.js b/dom/serviceworkers/test/notification_openWindow_worker.js
new file mode 100644
index 0000000000..890f70f795
--- /dev/null
+++ b/dom/serviceworkers/test/notification_openWindow_worker.js
@@ -0,0 +1,25 @@
+const gRoot = "http://mochi.test:8888/tests/dom/serviceworkers/test/";
+const gTestURL = gRoot + "test_notification_openWindow.html";
+const gClientURL = gRoot + "file_notification_openWindow.html";
+
+onmessage = function (event) {
+  if (event.data !== "DONE") {
+    dump(`ERROR: received unexpected message: ${JSON.stringify(event.data)}\n`);
+  }
+
+  event.waitUntil(
+    clients.matchAll({ includeUncontrolled: true }).then(cl => {
+      for (let client of cl) {
+        // The |gClientURL| window closes itself after posting the DONE message,
+        // so we don't need to send it anything here.
+        if (client.url === gTestURL) {
+          client.postMessage("DONE");
+        }
+      }
+    })
+  );
+};
+
+onnotificationclick = function (event) {
+  clients.openWindow(gClientURL);
+};
diff --git a/dom/serviceworkers/test/notificationclick-otherwindow.html b/dom/serviceworkers/test/notificationclick-otherwindow.html
new file mode 100644
index 0000000000..f64e82aabd
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclick-otherwindow.html
@@ -0,0 +1,30 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1114554 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var testWindow = parent;
+  if (opener) {
+    testWindow = opener;
+  }
+
+  navigator.serviceWorker.ready.then(function(swr) {
+    var ifr = document.createElement("iframe");
+    document.documentElement.appendChild(ifr);
+    ifr.contentWindow.ServiceWorkerRegistration.prototype.showNotification
+       .call(swr, "Hi there. The ServiceWorker should receive a click event for this.", { data: { complex: ["jsval", 5] }});
+  });
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    testWindow.callback(msg.data.result);
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/notificationclick.html b/dom/serviceworkers/test/notificationclick.html
new file mode 100644
index 0000000000..448764a1cb
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclick.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1114554 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var testWindow = parent;
+  if (opener) {
+    testWindow = opener;
+  }
+
+  navigator.serviceWorker.ready.then(function(swr) {
+    swr.showNotification("Hi there. The ServiceWorker should receive a click event for this.", { data: { complex: ["jsval", 5] }});
+  });
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    testWindow.callback(msg.data.result);
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/notificationclick.js b/dom/serviceworkers/test/notificationclick.js
new file mode 100644
index 0000000000..ae776095c7
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclick.js
@@ -0,0 +1,23 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+//
+onnotificationclick = function (e) {
+  self.clients.matchAll().then(function (clients) {
+    if (clients.length === 0) {
+      dump(
+        "********************* CLIENTS LIST EMPTY! Test will timeout! ***********************\n"
+      );
+      return;
+    }
+
+    clients.forEach(function (client) {
+      client.postMessage({
+        result:
+          e.notification.data &&
+          e.notification.data.complex &&
+          e.notification.data.complex[0] == "jsval" &&
+          e.notification.data.complex[1] == 5,
+      });
+    });
+  });
+};
diff --git a/dom/serviceworkers/test/notificationclick_focus.html b/dom/serviceworkers/test/notificationclick_focus.html
new file mode 100644
index 0000000000..0152d397f3
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclick_focus.html
@@ -0,0 +1,28 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1144660 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var testWindow = parent;
+  if (opener) {
+    testWindow = opener;
+  }
+
+  navigator.serviceWorker.ready.then(function(swr) {
+    swr.showNotification("Hi there. The ServiceWorker should receive a click event for this.");
+  });
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    dump("GOT Message " + JSON.stringify(msg.data) + "\n");
+    testWindow.callback(msg.data.ok);
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/notificationclick_focus.js b/dom/serviceworkers/test/notificationclick_focus.js
new file mode 100644
index 0000000000..1f0924560a
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclick_focus.js
@@ -0,0 +1,49 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+//
+
+function promisifyTimerFocus(client, delay) {
+  return new Promise(function (resolve, reject) {
+    setTimeout(function () {
+      client.focus().then(resolve, reject);
+    }, delay);
+  });
+}
+
+onnotificationclick = function (e) {
+  e.waitUntil(
+    self.clients.matchAll().then(function (clients) {
+      if (clients.length === 0) {
+        dump(
+          "********************* CLIENTS LIST EMPTY! Test will timeout! ***********************\n"
+        );
+        return Promise.resolve();
+      }
+
+      var immediatePromise = clients[0].focus();
+      var withinTimeout = promisifyTimerFocus(clients[0], 100);
+
+      var afterTimeout = promisifyTimerFocus(clients[0], 2000).then(
+        function () {
+          throw "Should have failed!";
+        },
+        function () {
+          return Promise.resolve();
+        }
+      );
+
+      return Promise.all([immediatePromise, withinTimeout, afterTimeout])
+        .then(function () {
+          clients.forEach(function (client) {
+            client.postMessage({ ok: true });
+          });
+        })
+        .catch(function (ex) {
+          dump("Error " + ex + "\n");
+          clients.forEach(function (client) {
+            client.postMessage({ ok: false });
+          });
+        });
+    })
+  );
+};
diff --git a/dom/serviceworkers/test/notificationclose.html b/dom/serviceworkers/test/notificationclose.html
new file mode 100644
index 0000000000..f18801122e
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclose.html
@@ -0,0 +1,37 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1265841 - controlled page</title>
+<script class="testbody" type="text/javascript">
+  var testWindow = parent;
+  if (opener) {
+    testWindow = opener;
+  }
+
+  navigator.serviceWorker.ready.then(function(swr) {
+    return swr.showNotification(
+      "Hi there. The ServiceWorker should receive a close event for this.",
+      { data: { complex: ["jsval", 5] }}).then(function() {
+        return swr;
+      });
+  }).then(function(swr) {
+    return swr.getNotifications();
+  }).then(function(notifications) {
+    notifications.forEach(function(notification) {
+      notification.close();
+    });
+  });
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    testWindow.callback(msg.data);
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/notificationclose.js b/dom/serviceworkers/test/notificationclose.js
new file mode 100644
index 0000000000..17c135a308
--- /dev/null
+++ b/dom/serviceworkers/test/notificationclose.js
@@ -0,0 +1,31 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+//
+onnotificationclose = function (e) {
+  e.waitUntil(
+    (async function () {
+      let windowOpened = true;
+      await clients.openWindow("hello.html").catch(err => {
+        windowOpened = false;
+      });
+
+      self.clients.matchAll().then(function (clients) {
+        if (clients.length === 0) {
+          dump("*** CLIENTS LIST EMPTY! Test will timeout! ***\n");
+          return;
+        }
+
+        clients.forEach(function (client) {
+          client.postMessage({
+            result:
+              e.notification.data &&
+              e.notification.data.complex &&
+              e.notification.data.complex[0] == "jsval" &&
+              e.notification.data.complex[1] == 5,
+            windowOpened,
+          });
+        });
+      });
+    })()
+  );
+};
diff --git a/dom/serviceworkers/test/notify_loaded.js b/dom/serviceworkers/test/notify_loaded.js
new file mode 100644
index 0000000000..3bf001abd6
--- /dev/null
+++ b/dom/serviceworkers/test/notify_loaded.js
@@ -0,0 +1 @@
+parent.postMessage("SCRIPT_LOADED", "*");
diff --git a/dom/serviceworkers/test/onmessageerror_worker.js b/dom/serviceworkers/test/onmessageerror_worker.js
new file mode 100644
index 0000000000..4932be6de0
--- /dev/null
+++ b/dom/serviceworkers/test/onmessageerror_worker.js
@@ -0,0 +1,55 @@
+async function getSwContainer() {
+  const clients = await self.clients.matchAll({
+    type: "window",
+    includeUncontrolled: true,
+  });
+
+  for (let client of clients) {
+    if (client.url.endsWith("test_onmessageerror.html")) {
+      return client;
+    }
+  }
+  return undefined;
+}
+
+self.addEventListener("message", async e => {
+  const config = e.data;
+  const swContainer = await getSwContainer();
+
+  if (config == "send-bad-message") {
+    const serializable = true;
+    const deserializable = false;
+
+    swContainer.postMessage(
+      new StructuredCloneTester(serializable, deserializable)
+    );
+
+    return;
+  }
+
+  if (!config.serializable) {
+    swContainer.postMessage({
+      result: "Error",
+      reason: "Service Worker received an unserializable object",
+    });
+
+    return;
+  }
+
+  if (!config.deserializable) {
+    swContainer.postMessage({
+      result: "Error",
+      reason:
+        "Service Worker received (and deserialized) an un-deserializable object",
+    });
+
+    return;
+  }
+
+  swContainer.postMessage({ received: "message" });
+});
+
+self.addEventListener("messageerror", async () => {
+  const swContainer = await getSwContainer();
+  swContainer.postMessage({ received: "messageerror" });
+});
diff --git a/dom/serviceworkers/test/opaque_intercept_worker.js b/dom/serviceworkers/test/opaque_intercept_worker.js
new file mode 100644
index 0000000000..8c0882ad11
--- /dev/null
+++ b/dom/serviceworkers/test/opaque_intercept_worker.js
@@ -0,0 +1,40 @@
+var name = "opaqueInterceptCache";
+
+// Cross origin request to ensure that an opaque response is used
+var prefix = "http://example.com/tests/dom/serviceworkers/test/";
+
+var testReady = new Promise(resolve => {
+  self.addEventListener(
+    "message",
+    m => {
+      resolve();
+    },
+    { once: true }
+  );
+});
+
+self.addEventListener("install", function (event) {
+  var request = new Request(prefix + "notify_loaded.js", { mode: "no-cors" });
+  event.waitUntil(
+    Promise.all([caches.open(name), fetch(request), testReady]).then(function (
+      results
+    ) {
+      var cache = results[0];
+      var response = results[1];
+      return cache.put("./sw_clients/does_not_exist.js", response);
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+  event.respondWith(
+    caches
+      .open(name)
+      .then(function (cache) {
+        return cache.match(event.request);
+      })
+      .then(function (response) {
+        return response || fetch(event.request);
+      })
+  );
+});
diff --git a/dom/serviceworkers/test/openWindow_worker.js b/dom/serviceworkers/test/openWindow_worker.js
new file mode 100644
index 0000000000..ffaad009be
--- /dev/null
+++ b/dom/serviceworkers/test/openWindow_worker.js
@@ -0,0 +1,178 @@
+// the worker won't shut down between events because we increased
+// the timeout values.
+var client;
+var window_count = 0;
+var expected_window_count = 9;
+var isolated_window_count = 0;
+var expected_isolated_window_count = 2;
+var resolve_got_all_windows = null;
+var got_all_windows = new Promise(function (res, rej) {
+  resolve_got_all_windows = res;
+});
+
+// |expected_window_count| needs to be updated for every new call that's
+// expected to actually open a new window regardless of what |clients.openWindow|
+// returns.
+function testForUrl(url, throwType, clientProperties, resultsArray) {
+  return clients
+    .openWindow(url)
+    .then(function (e) {
+      if (throwType != null) {
+        resultsArray.push({
+          result: false,
+          message: "openWindow should throw " + throwType,
+        });
+      } else if (clientProperties) {
+        resultsArray.push({
+          result: e instanceof WindowClient,
+          message: `openWindow should resolve to a WindowClient for url ${url}, got ${e}`,
+        });
+        resultsArray.push({
+          result: e.url == clientProperties.url,
+          message: "Client url should be " + clientProperties.url,
+        });
+        // Add more properties
+      } else {
+        resultsArray.push({
+          result: e == null,
+          message: "Open window should resolve to null. Got: " + e,
+        });
+      }
+    })
+    .catch(function (err) {
+      if (throwType == null) {
+        resultsArray.push({
+          result: false,
+          message: "Unexpected throw: " + err,
+        });
+      } else {
+        resultsArray.push({
+          result: err.toString().includes(throwType),
+          message: "openWindow should throw: " + err,
+        });
+      }
+    });
+}
+
+onmessage = function (event) {
+  if (event.data == "testNoPopup") {
+    client = event.source;
+
+    var results = [];
+    var promises = [];
+    promises.push(testForUrl("about:blank", "TypeError", null, results));
+    promises.push(
+      testForUrl("http://example.com", "InvalidAccessError", null, results)
+    );
+    promises.push(
+      testForUrl("_._*`InvalidURL", "InvalidAccessError", null, results)
+    );
+    event.waitUntil(
+      Promise.all(promises).then(function (e) {
+        client.postMessage(results);
+      })
+    );
+  }
+
+  if (event.data == "NEW_WINDOW" || event.data == "NEW_ISOLATED_WINDOW") {
+    window_count += 1;
+    if (event.data == "NEW_ISOLATED_WINDOW") {
+      isolated_window_count += 1;
+    }
+    if (window_count == expected_window_count) {
+      resolve_got_all_windows();
+    }
+  }
+
+  if (event.data == "CHECK_NUMBER_OF_WINDOWS") {
+    event.waitUntil(
+      got_all_windows
+        .then(function () {
+          return clients.matchAll();
+        })
+        .then(function (cl) {
+          event.source.postMessage([
+            {
+              result: cl.length == expected_window_count,
+              message: `The number of windows is correct. ${cl.length} == ${expected_window_count}`,
+            },
+            {
+              result: isolated_window_count == expected_isolated_window_count,
+              message: `The number of isolated windows is correct. ${isolated_window_count} == ${expected_isolated_window_count}`,
+            },
+          ]);
+          for (i = 0; i < cl.length; i++) {
+            cl[i].postMessage("CLOSE");
+          }
+        })
+    );
+  }
+};
+
+onnotificationclick = function (e) {
+  var results = [];
+  var promises = [];
+
+  var redirect =
+    "http://mochi.test:8888/tests/dom/serviceworkers/test/redirect.sjs?";
+  var redirect_xorigin =
+    "http://example.com/tests/dom/serviceworkers/test/redirect.sjs?";
+  var same_origin =
+    "http://mochi.test:8888/tests/dom/serviceworkers/test/open_window/client.sjs";
+  var different_origin =
+    "http://example.com/tests/dom/serviceworkers/test/open_window/client.sjs";
+
+  promises.push(testForUrl("about:blank", "TypeError", null, results));
+  promises.push(testForUrl(different_origin, null, null, results));
+  promises.push(testForUrl(same_origin, null, { url: same_origin }, results));
+  promises.push(
+    testForUrl("open_window/client.sjs", null, { url: same_origin }, results)
+  );
+
+  // redirect tests
+  promises.push(
+    testForUrl(
+      redirect + "open_window/client.sjs",
+      null,
+      { url: same_origin },
+      results
+    )
+  );
+  promises.push(testForUrl(redirect + different_origin, null, null, results));
+
+  promises.push(
+    testForUrl(redirect_xorigin + "open_window/client.sjs", null, null, results)
+  );
+  promises.push(
+    testForUrl(
+      redirect_xorigin + same_origin,
+      null,
+      { url: same_origin },
+      results
+    )
+  );
+
+  // coop+coep tests
+  promises.push(
+    testForUrl(
+      same_origin + "?crossOriginIsolated=true",
+      null,
+      { url: same_origin + "?crossOriginIsolated=true" },
+      results
+    )
+  );
+  promises.push(
+    testForUrl(
+      different_origin + "?crossOriginIsolated=true",
+      null,
+      null,
+      results
+    )
+  );
+
+  e.waitUntil(
+    Promise.all(promises).then(function () {
+      client.postMessage(results);
+    })
+  );
+};
diff --git a/dom/serviceworkers/test/open_window/client.sjs b/dom/serviceworkers/test/open_window/client.sjs
new file mode 100644
index 0000000000..bfb566ead0
--- /dev/null
+++ b/dom/serviceworkers/test/open_window/client.sjs
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const RESPONSE = `
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1172870 - page opened by ServiceWorkerClients.OpenWindow</title>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<h1>client.sjs</h1>
+<script class="testbody" type="text/javascript">
+
+  window.onload = function() {
+    if (document.domain === "mochi.test") {
+      navigator.serviceWorker.ready.then(function(result) {
+        navigator.serviceWorker.onmessage = function(event) {
+          if (event.data !== "CLOSE") {
+            dump("ERROR: unexepected reply from the service worker.\\n");
+          }
+          if (parent) {
+            parent.postMessage("CLOSE", "*");
+          }
+          window.close();
+        }
+
+        let message = window.crossOriginIsolated ? "NEW_ISOLATED_WINDOW" : "NEW_WINDOW";
+        navigator.serviceWorker.controller.postMessage(message);
+      })
+    } else {
+      window.onmessage = function(event) {
+        if (event.data !== "CLOSE") {
+            dump("ERROR: unexepected reply from the iframe.\\n");
+        }
+        window.close();
+      }
+
+      var iframe = document.createElement('iframe');
+      iframe.src = "http://mochi.test:8888/tests/dom/serviceworkers/test/open_window/client.sjs";
+      document.body.appendChild(iframe);
+    }
+  }
+
+</script>
+</pre>
+</body>
+</html>
+`;
+
+function handleRequest(request, response) {
+  let query = new URLSearchParams(request.queryString);
+
+  // If the request has been marked to be isolated with COOP+COEP, set the appropriate headers.
+  if (query.get("crossOriginIsolated") == "true") {
+    response.setHeader("Cross-Origin-Opener-Policy", "same-origin", false);
+  }
+
+  // Always set the COEP and CORP headers, so that this document can be framed
+  // by a document which has also set COEP to require-corp.
+  response.setHeader("Cross-Origin-Embedder-Policy", "require-corp", false);
+  response.setHeader("Cross-Origin-Resource-Policy", "cross-origin", false);
+
+  response.setHeader("Content-Type", "text/html", false);
+  response.write(RESPONSE);
+}
diff --git a/dom/serviceworkers/test/page_post_controlled.html b/dom/serviceworkers/test/page_post_controlled.html
new file mode 100644
index 0000000000..27694c0027
--- /dev/null
+++ b/dom/serviceworkers/test/page_post_controlled.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+<script type="text/javascript">
+  window.parent.postMessage({
+    controlled: !!navigator.serviceWorker.controller
+  }, "*");
+
+  addEventListener("message", e => {
+    if (e.data == "create nested iframe") {
+      const iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
+      iframe.src = location.href;
+    } else {
+      window.parent.postMessage(e.data, "*");
+    }
+  });
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/parse_error_worker.js b/dom/serviceworkers/test/parse_error_worker.js
new file mode 100644
index 0000000000..b6a8ef0a1a
--- /dev/null
+++ b/dom/serviceworkers/test/parse_error_worker.js
@@ -0,0 +1,2 @@
+// intentional parse error.
+var foo = {;
diff --git a/dom/serviceworkers/test/performance/intercepted.txt b/dom/serviceworkers/test/performance/intercepted.txt
new file mode 100644
index 0000000000..87c7a8efe7
--- /dev/null
+++ b/dom/serviceworkers/test/performance/intercepted.txt
@@ -0,0 +1 @@
+intercepted
diff --git a/dom/serviceworkers/test/performance/perftest.toml b/dom/serviceworkers/test/performance/perftest.toml
new file mode 100644
index 0000000000..6a7e5928be
--- /dev/null
+++ b/dom/serviceworkers/test/performance/perftest.toml
@@ -0,0 +1,14 @@
+[DEFAULT]
+support-files = [
+  "intercepted.txt",
+  "perfutils.js",
+  "sw_cacher.js",
+  "sw_empty.js",
+  "sw_intercept_target.js",
+  "target.txt",
+  "time_fetch.html",
+]
+
+["test_caching.html"]
+["test_fetch.html"]
+["test_registration.html"]
diff --git a/dom/serviceworkers/test/performance/perfutils.js b/dom/serviceworkers/test/performance/perfutils.js
new file mode 100644
index 0000000000..d7edbe2fe7
--- /dev/null
+++ b/dom/serviceworkers/test/performance/perfutils.js
@@ -0,0 +1,46 @@
+"use strict";
+
+/**
+ * Given a map from test names to arrays of results, report perfherder metrics
+ * and log full results.
+ */
+function reportMetrics(journal) {
+  let metrics = {};
+  let text = "\nResults (ms)\n";
+
+  const names = Object.keys(journal);
+  const prefixLen = 1 + Math.max(...names.map(str => str.length));
+
+  for (const name in journal) {
+    const med = median(journal[name]);
+    text += (name + ":").padEnd(prefixLen, " ") + stringify(journal[name]);
+    text += "   median " + med + "\n";
+    metrics[name] = med;
+  }
+
+  dump(text);
+  info("perfMetrics", JSON.stringify(metrics));
+}
+
+function median(arr) {
+  arr = [...arr].sort((a, b) => a - b);
+  const mid = Math.floor(arr.length / 2);
+
+  if (arr.length % 2) {
+    return arr[mid];
+  }
+
+  return (arr[mid - 1] + arr[mid]) / 2;
+}
+
+function stringify(arr) {
+  function pad(num) {
+    let s = num.toString().padStart(5, " ");
+    if (s[0] != " ") {
+      s = " " + s;
+    }
+    return s;
+  }
+
+  return arr.reduce((acc, elem) => acc + pad(elem), "");
+}
diff --git a/dom/serviceworkers/test/performance/sw_cacher.js b/dom/serviceworkers/test/performance/sw_cacher.js
new file mode 100644
index 0000000000..5a441ef785
--- /dev/null
+++ b/dom/serviceworkers/test/performance/sw_cacher.js
@@ -0,0 +1,18 @@
+"use strict";
+
+oninstall = function (event) {
+  event.waitUntil(
+    caches.open("perftest").then(function (cache) {
+      return cache.put("cached.txt", new Response("cached.txt"));
+    })
+  );
+};
+
+onfetch = function (event) {
+  if (event.request.url.endsWith("/cached.txt")) {
+    var p = caches.match("cached.txt", { cacheName: "perftest" });
+    event.respondWith(p);
+  } else if (event.request.url.endsWith("/uncached.txt")) {
+    event.respondWith(new Response("uncached.txt"));
+  }
+};
diff --git a/dom/serviceworkers/test/performance/sw_empty.js b/dom/serviceworkers/test/performance/sw_empty.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/performance/sw_empty.js
diff --git a/dom/serviceworkers/test/performance/sw_intercept_target.js b/dom/serviceworkers/test/performance/sw_intercept_target.js
new file mode 100644
index 0000000000..47b3853978
--- /dev/null
+++ b/dom/serviceworkers/test/performance/sw_intercept_target.js
@@ -0,0 +1,7 @@
+"use strict";
+
+onfetch = function (event) {
+  if (event.request.url.indexOf("target.txt") != -1) {
+    event.respondWith(fetch("intercepted.txt"));
+  }
+};
diff --git a/dom/serviceworkers/test/performance/target.txt b/dom/serviceworkers/test/performance/target.txt
new file mode 100644
index 0000000000..eb5a316cbd
--- /dev/null
+++ b/dom/serviceworkers/test/performance/target.txt
@@ -0,0 +1 @@
+target
diff --git a/dom/serviceworkers/test/performance/test_caching.html b/dom/serviceworkers/test/performance/test_caching.html
new file mode 100644
index 0000000000..cd6d4cf493
--- /dev/null
+++ b/dom/serviceworkers/test/performance/test_caching.html
@@ -0,0 +1,89 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Service worker performance test: caching</title>
+</head>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="../utils.js"></script>
+<script src="perfutils.js"></script>
+<script>
+
+  "use strict";
+
+  const NO_CACHE = "No cache";
+  const CACHED = "Cached";
+  const NO_CACHE_AGAIN = "No cache again";
+
+  var journal = {};
+  journal[NO_CACHE] = [];
+  journal[CACHED] = [];
+  journal[NO_CACHE_AGAIN] = [];
+
+  const ITERATIONS = 10;
+
+  var perfMetadata = {
+    owner: "DOM LWS",
+    name: "Service Worker Caching",
+    description: "Test service worker caching.",
+    options: {
+      default: {
+        perfherder: true,
+        perfherder_metrics: [
+          // Here, we can't use the constants defined above because perfherder
+          // grabs data from the parse tree.
+          { name: "No cache", unit: "ms", shouldAlert: true },
+          { name: "Cached", unit: "ms", shouldAlert: true },
+          { name: "No cache again", unit: "ms", shouldAlert: true },
+        ],
+        verbose: true,
+        manifest: "perftest.toml",
+        manifest_flavor: "plain",
+      },
+    },
+  };
+
+  add_task(async () => {
+    await SpecialPowers.pushPrefEnv({
+      set: [["dom.serviceWorkers.testing.enabled", true]]
+    });
+  });
+
+  function create_iframe(url) {
+    return new Promise(function(res) {
+      let iframe = document.createElement("iframe");
+      iframe.src = url;
+      iframe.onload = function() { res(iframe) }
+      document.body.appendChild(iframe);
+    });
+  }
+
+  async function time_fetch(journal, iframe, filename) {
+    for (let i = 0; i < ITERATIONS; i++) {
+      let result = await iframe.contentWindow.time_fetch(filename);
+      is(result.status, 200);
+      is(result.data, filename);
+      journal.push(result.elapsed_ms);
+    }
+  }
+
+  add_task(async () => {
+    let reg = await navigator.serviceWorker.register("sw_cacher.js");
+    await waitForState(reg.installing, "activated");
+
+    let iframe = await create_iframe("time_fetch.html");
+
+    await time_fetch(journal[NO_CACHE], iframe, "uncached.txt");
+    await time_fetch(journal[CACHED], iframe, "cached.txt");
+    await time_fetch(journal[NO_CACHE_AGAIN], iframe, "uncached.txt");
+
+    await reg.unregister();
+  });
+
+  add_task(() => {
+    reportMetrics(journal);
+  });
+
+</script>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/performance/test_fetch.html b/dom/serviceworkers/test/performance/test_fetch.html
new file mode 100644
index 0000000000..29dd65b595
--- /dev/null
+++ b/dom/serviceworkers/test/performance/test_fetch.html
@@ -0,0 +1,168 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Service worker performance test: fetch</title>
+</head>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="../utils.js"></script>
+<script src="perfutils.js"></script>
+<script>
+
+  "use strict";
+
+  const COLD_FETCH = "Cold fetch";
+  const UNDISTURBED_FETCH = "Undisturbed fetch";
+  const INTERCEPTED_FETCH = "Intercepted fetch";
+  const LIBERATED_FETCH = "Liberated fetch";
+  const UNDISTURBED_XHR = "Undisturbed XHR";
+  const INTERCEPTED_XHR = "Intercepted XHR";
+  const LIBERATED_XHR = "Liberated XHR";
+
+  var journal = {};
+  journal[COLD_FETCH] = [];
+  journal[UNDISTURBED_FETCH] = [];
+  journal[INTERCEPTED_FETCH] = [];
+  journal[LIBERATED_FETCH] = [];
+  journal[UNDISTURBED_XHR] = [];
+  journal[INTERCEPTED_XHR] = [];
+  journal[LIBERATED_XHR] = [];
+
+  const ITERATIONS = 10;
+
+  var perfMetadata = {
+    owner: "DOM LWS",
+    name: "Service Worker Fetch",
+    description: "Test cold and warm fetches.",
+    options: {
+      default: {
+        perfherder: true,
+        perfherder_metrics: [
+          // Here, we can't use the constants defined above because perfherder
+          // grabs data from the parse tree.
+          { name: "Cold fetch", unit: "ms", shouldAlert: true },
+          { name: "Undisturbed fetch", unit: "ms", shouldAlert: true },
+          { name: "Intercepted fetch", unit: "ms", shouldAlert: true },
+          { name: "Liberated fetch", unit: "ms", shouldAlert: true },
+          { name: "Undisturbed XHR", unit: "ms", shouldAlert: true },
+          { name: "Intercepted XHR", unit: "ms", shouldAlert: true },
+          { name: "Liberated XHR", unit: "ms", shouldAlert: true },
+        ],
+        verbose: true,
+        manifest: "perftest.toml",
+        manifest_flavor: "plain",
+      },
+    },
+  };
+
+  function create_iframe(url) {
+    return new Promise(function(res) {
+      let iframe = document.createElement("iframe");
+      iframe.src = url;
+      iframe.onload = function() { res(iframe) }
+      document.body.appendChild(iframe);
+    });
+  }
+
+  add_task(async () => {
+    await SpecialPowers.pushPrefEnv({
+      set: [["dom.serviceWorkers.testing.enabled", true]]
+    });
+  });
+
+  /**
+   * Time fetch from a fresh service worker.
+   */
+  add_task(async () => {
+    for (let i = 0; i < ITERATIONS; i++) {
+      let reg = await navigator.serviceWorker.register("sw_intercept_target.js");
+      await waitForState(reg.installing, "activated");
+
+      let iframe = await create_iframe("time_fetch.html");
+
+      let result = await iframe.contentWindow.time_fetch("target.txt");
+      is(result.status, 200);
+      is(result.data, "intercepted\n");
+      journal[COLD_FETCH].push(result.elapsed_ms);
+
+      ok(document.body.removeChild(iframe), "Failed to remove child iframe");
+
+      await reg.unregister();
+    }
+  });
+
+  /**
+   * Time unintercepted fetch, intercepted fetch, then unintercepted
+   * fetch again.
+   */
+  add_task(async () => {
+    let reg = await navigator.serviceWorker.register("sw_intercept_target.js");
+    await waitForState(reg.installing, "activated");
+
+    async function measure(journal, sw_enabled) {
+      await SpecialPowers.pushPrefEnv({
+        set: [["dom.serviceWorkers.enabled", sw_enabled]]
+      });
+
+      let iframe = await create_iframe("time_fetch.html");
+
+      for (let i = 0; i < ITERATIONS; i++) {
+        let result = await iframe.contentWindow.time_fetch("target.txt");
+        is(result.status, 200);
+        is(result.data, sw_enabled ? "intercepted\n" : "target\n");
+        journal.push(result.elapsed_ms);
+      }
+
+      ok(document.body.removeChild(iframe), "Failed to remove child iframe");
+
+      await SpecialPowers.popPrefEnv();
+    }
+
+    await measure(journal[UNDISTURBED_FETCH], false);
+    await measure(journal[INTERCEPTED_FETCH], true);
+    await measure(journal[LIBERATED_FETCH], false);
+
+    await reg.unregister();
+  });
+
+  /**
+   * Time unintercepted XHR, intercepted XHR, then unintercepted
+   * XHR again.
+   */
+  add_task(async () => {
+    let reg = await navigator.serviceWorker.register("sw_intercept_target.js");
+    await waitForState(reg.installing, "activated");
+
+    async function measure(journal, sw_enabled) {
+      await SpecialPowers.pushPrefEnv({
+        set: [["dom.serviceWorkers.enabled", sw_enabled]]
+      });
+
+      let iframe = await create_iframe("time_fetch.html");
+
+      for (let i = 0; i < ITERATIONS; i++) {
+        let result = await iframe.contentWindow.time_xhr("target.txt");
+        is(result.status, 200);
+        is(result.data, sw_enabled ? "intercepted\n" : "target\n");
+        journal.push(result.elapsed_ms);
+      }
+
+      ok(document.body.removeChild(iframe), "Failed to remove child iframe");
+
+      await SpecialPowers.popPrefEnv();
+    }
+
+    await measure(journal[UNDISTURBED_XHR], false);
+    await measure(journal[INTERCEPTED_XHR], true);
+    await measure(journal[LIBERATED_XHR], false);
+
+    await reg.unregister();
+  });
+
+  add_task(() => {
+    reportMetrics(journal);
+  });
+
+</script>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/performance/test_registration.html b/dom/serviceworkers/test/performance/test_registration.html
new file mode 100644
index 0000000000..d5abbf6775
--- /dev/null
+++ b/dom/serviceworkers/test/performance/test_registration.html
@@ -0,0 +1,89 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Service worker performance test: registration</title>
+</head>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="../utils.js"></script>
+<script src="perfutils.js"></script>
+<script>
+
+  "use strict";
+
+  const REGISTRATION = "Registration";
+  const ACTIVATION = "Activation";
+  const UNREGISTRATION = "Unregistration";
+
+  var journal = [];
+  journal[REGISTRATION] = [];
+  journal[ACTIVATION] = [];
+  journal[UNREGISTRATION] = [];
+
+  const ITERATIONS = 10;
+
+  var perfMetadata = {
+    owner: "DOM LWS",
+    name: "Service Worker Registration",
+    description: "Test registration, activation, and unregistration.",
+    options: {
+      default: {
+        perfherder: true,
+        perfherder_metrics: [
+          // Here, we can't use the constants defined above because perfherder
+          // grabs data from the parse tree.
+          { name: "Registration", unit: "ms", shouldAlert: true },
+          { name: "Activation", unit: "ms", shouldAlert: true },
+          { name: "Unregistration", unit: "ms", shouldAlert: true },
+        ],
+        verbose: true,
+        manifest: "perftest.toml",
+        manifest_flavor: "plain",
+      },
+    },
+  };
+
+  function create_iframe(url) {
+    return new Promise(function(res) {
+      let iframe = document.createElement("iframe");
+      iframe.src = url;
+      iframe.onload = function() { res(iframe) }
+      document.body.appendChild(iframe);
+    });
+  }
+
+  add_task(async () => {
+    await SpecialPowers.pushPrefEnv({
+      set: [["dom.serviceWorkers.testing.enabled", true]]
+    });
+
+    async function measure() {
+      let begin_ts = performance.now();
+      let reg = await navigator.serviceWorker.register("sw_empty.js");
+      let reg_ts = performance.now();
+      await waitForState(reg.installing, "activated");
+      let act_ts = performance.now();
+      await reg.unregister();
+      let unreg_ts = performance.now();
+
+      journal[REGISTRATION].push(reg_ts - begin_ts);
+      journal[ACTIVATION].push(act_ts - reg_ts);
+      journal[UNREGISTRATION].push(unreg_ts - act_ts);
+    }
+
+    for (let i = 0; i < ITERATIONS; i++) {
+      await measure();
+    }
+
+    await SpecialPowers.popPrefEnv();
+
+    ok(true);
+  });
+
+  add_task(() => {
+    reportMetrics(journal);
+  });
+
+</script>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/performance/time_fetch.html b/dom/serviceworkers/test/performance/time_fetch.html
new file mode 100644
index 0000000000..a771d4889f
--- /dev/null
+++ b/dom/serviceworkers/test/performance/time_fetch.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<script>
+
+  "use strict";
+
+  async function time_fetch(url) {
+    let start = performance.now();
+    let res = await fetch(url);
+    let elapsed = performance.now() - start;
+
+    return {
+      elapsed_ms : elapsed,
+      status : res.status,
+      data : await res.text()
+    };
+  }
+
+  async function time_xhr(url) {
+    let xhr = new XMLHttpRequest();
+    xhr.open("GET", url, false);
+    let start = performance.now();
+    xhr.send();
+    let elapsed = performance.now() - start;
+
+    return {
+      elapsed_ms : elapsed,
+      status : xhr.status,
+      data : xhr.responseText
+    }
+  }
+
+</script>
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/pref/fetch_nonexistent_file.html b/dom/serviceworkers/test/pref/fetch_nonexistent_file.html
new file mode 100644
index 0000000000..84c3a1398d
--- /dev/null
+++ b/dom/serviceworkers/test/pref/fetch_nonexistent_file.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<script>
+
+  async function fetch_status() {
+    let response = await fetch('this_file_does_not_exist.txt');
+    return response.status;
+  }
+
+</script>
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/pref/intercept_nonexistent_file_sw.js b/dom/serviceworkers/test/pref/intercept_nonexistent_file_sw.js
new file mode 100644
index 0000000000..ab0f1d572d
--- /dev/null
+++ b/dom/serviceworkers/test/pref/intercept_nonexistent_file_sw.js
@@ -0,0 +1,5 @@
+onfetch = function (e) {
+  if (e.request.url.match(/this_file_does_not_exist.txt$/)) {
+    e.respondWith(new Response("intercepted"));
+  }
+};
diff --git a/dom/serviceworkers/test/redirect.sjs b/dom/serviceworkers/test/redirect.sjs
new file mode 100644
index 0000000000..43fec90b5a
--- /dev/null
+++ b/dom/serviceworkers/test/redirect.sjs
@@ -0,0 +1,4 @@
+function handleRequest(request, response) {
+  response.setStatusLine(request.httpVersion, 301, "Moved Permanently");
+  response.setHeader("Location", request.queryString, false);
+}
diff --git a/dom/serviceworkers/test/redirect_post.sjs b/dom/serviceworkers/test/redirect_post.sjs
new file mode 100644
index 0000000000..5483138d2b
--- /dev/null
+++ b/dom/serviceworkers/test/redirect_post.sjs
@@ -0,0 +1,39 @@
+const CC = Components.Constructor;
+const BinaryInputStream = CC(
+  "@mozilla.org/binaryinputstream;1",
+  "nsIBinaryInputStream",
+  "setInputStream"
+);
+
+function handleRequest(request, response) {
+  var query = {};
+  request.queryString.split("&").forEach(function (val) {
+    var [name, value] = val.split("=");
+    query[name] = unescape(value);
+  });
+
+  var bodyStream = new BinaryInputStream(request.bodyInputStream);
+  var bodyBytes = [];
+  while ((bodyAvail = bodyStream.available()) > 0) {
+    Array.prototype.push.apply(bodyBytes, bodyStream.readByteArray(bodyAvail));
+  }
+
+  var body = decodeURIComponent(
+    escape(String.fromCharCode.apply(null, bodyBytes))
+  );
+
+  var currentHop = query.hop ? parseInt(query.hop) : 0;
+
+  var obj = JSON.parse(body);
+  if (currentHop < obj.hops) {
+    var newURL =
+      "/tests/dom/serviceworkers/test/redirect_post.sjs?hop=" +
+      (1 + currentHop);
+    response.setStatusLine(null, 307, "redirect");
+    response.setHeader("Location", newURL);
+    return;
+  }
+
+  response.setHeader("Content-Type", "application/json");
+  response.write(body);
+}
diff --git a/dom/serviceworkers/test/redirect_serviceworker.sjs b/dom/serviceworkers/test/redirect_serviceworker.sjs
new file mode 100644
index 0000000000..858e6d4824
--- /dev/null
+++ b/dom/serviceworkers/test/redirect_serviceworker.sjs
@@ -0,0 +1,7 @@
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader(
+    "Location",
+    "http://mochi.test:8888/tests/dom/serviceworkers/test/worker.js"
+  );
+}
diff --git a/dom/serviceworkers/test/register_https.html b/dom/serviceworkers/test/register_https.html
new file mode 100644
index 0000000000..572c7ce6b8
--- /dev/null
+++ b/dom/serviceworkers/test/register_https.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<script>
+function ok(condition, message) {
+  parent.postMessage({type: "ok", status: condition, msg: message}, "*");
+}
+
+function done() {
+  parent.postMessage({type: "done"}, "*");
+}
+
+ok(location.protocol == "https:", "We should be loaded from HTTPS");
+ok(!window.isSecureContext, "Should not be secure context");
+ok(!("serviceWorker" in navigator), "ServiceWorkerContainer not availalble in insecure context");
+done();
+</script>
diff --git a/dom/serviceworkers/test/sanitize/example_check_and_unregister.html b/dom/serviceworkers/test/sanitize/example_check_and_unregister.html
new file mode 100644
index 0000000000..8553e442d6
--- /dev/null
+++ b/dom/serviceworkers/test/sanitize/example_check_and_unregister.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<script>
+  function done(exists) {
+    parent.postMessage(exists, '*');
+  }
+
+  function fail() {
+    parent.postMessage("FAIL", '*');
+  }
+
+  navigator.serviceWorker.getRegistration(".").then(function(reg) {
+    if (reg) {
+      reg.unregister().then(done.bind(undefined, true), fail);
+    } else {
+      dump("getRegistration() returned undefined registration\n");
+      done(false);
+    }
+  }, function(e) {
+    dump("getRegistration() failed\n");
+    fail();
+  });
+</script>
diff --git a/dom/serviceworkers/test/sanitize/frame.html b/dom/serviceworkers/test/sanitize/frame.html
new file mode 100644
index 0000000000..b4bf7a1ff1
--- /dev/null
+++ b/dom/serviceworkers/test/sanitize/frame.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<script>
+  fetch("intercept-this").then(function(r) {
+    if (!r.ok) {
+      return "FAIL";
+    }
+    return r.text();
+  }).then(function(body) {
+    parent.postMessage(body, '*');
+  });
+</script>
diff --git a/dom/serviceworkers/test/sanitize/register.html b/dom/serviceworkers/test/sanitize/register.html
new file mode 100644
index 0000000000..4ae74bec11
--- /dev/null
+++ b/dom/serviceworkers/test/sanitize/register.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<script>
+  function done() {
+    parent.postMessage('', '*');
+  }
+
+  navigator.serviceWorker.ready.then(done);
+  navigator.serviceWorker.register("../sanitize_worker.js", {scope: "."});
+</script>
diff --git a/dom/serviceworkers/test/sanitize_worker.js b/dom/serviceworkers/test/sanitize_worker.js
new file mode 100644
index 0000000000..920eb7a4f7
--- /dev/null
+++ b/dom/serviceworkers/test/sanitize_worker.js
@@ -0,0 +1,5 @@
+onfetch = function (e) {
+  if (e.request.url.includes("intercept-this")) {
+    e.respondWith(new Response("intercepted"));
+  }
+};
diff --git a/dom/serviceworkers/test/scope/scope_worker.js b/dom/serviceworkers/test/scope/scope_worker.js
new file mode 100644
index 0000000000..4164e7a244
--- /dev/null
+++ b/dom/serviceworkers/test/scope/scope_worker.js
@@ -0,0 +1,2 @@
+// This worker is used to test if calling register() without a scope argument
+// leads to scope being relative to service worker script.
diff --git a/dom/serviceworkers/test/script_file_upload.js b/dom/serviceworkers/test/script_file_upload.js
new file mode 100644
index 0000000000..5e9aeb6098
--- /dev/null
+++ b/dom/serviceworkers/test/script_file_upload.js
@@ -0,0 +1,16 @@
+/* eslint-env mozilla/chrome-script */
+
+// eslint-disable-next-line mozilla/reject-importGlobalProperties
+Cu.importGlobalProperties(["File"]);
+
+addMessageListener("file.open", function (e) {
+  var testFile = Cc["@mozilla.org/file/directory_service;1"]
+    .getService(Ci.nsIDirectoryService)
+    .QueryInterface(Ci.nsIProperties)
+    .get("ProfD", Ci.nsIFile);
+  testFile.append("prefs.js");
+
+  File.createFromNsIFile(testFile).then(function (file) {
+    sendAsyncMessage("file.opened", { file });
+  });
+});
diff --git a/dom/serviceworkers/test/self_update_worker.sjs b/dom/serviceworkers/test/self_update_worker.sjs
new file mode 100644
index 0000000000..8081b20afd
--- /dev/null
+++ b/dom/serviceworkers/test/self_update_worker.sjs
@@ -0,0 +1,42 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const WORKER_BODY = `
+onactivate = function(event) {
+  let promise = clients.matchAll({includeUncontrolled: true}).then(function(clients) {
+    for (i = 0; i < clients.length; i++) {
+      clients[i].postMessage({version: version});
+    }
+  }).then(function() {
+    return self.registration.update();
+  });
+  event.waitUntil(promise);
+};
+`;
+
+function handleRequest(request, response) {
+  if (request.queryString == "clearcounter") {
+    setState("count", "1");
+    response.write("ok");
+    return;
+  }
+
+  let count = getState("count");
+  if (count === "") {
+    count = 1;
+  } else {
+    count = parseInt(count);
+  }
+
+  let worker = "var version = " + count + ";\n";
+  worker = worker + WORKER_BODY;
+
+  // This header is necessary for making this script able to be loaded.
+  response.setHeader("Content-Type", "application/javascript");
+
+  // If this is the first request, return the first source.
+  response.write(worker);
+  setState("count", "" + (count + 1));
+}
diff --git a/dom/serviceworkers/test/server_file_upload.sjs b/dom/serviceworkers/test/server_file_upload.sjs
new file mode 100644
index 0000000000..a2f960af94
--- /dev/null
+++ b/dom/serviceworkers/test/server_file_upload.sjs
@@ -0,0 +1,22 @@
+const CC = Components.Constructor;
+const BinaryInputStream = CC(
+  "@mozilla.org/binaryinputstream;1",
+  "nsIBinaryInputStream",
+  "setInputStream"
+);
+const BinaryOutputStream = CC(
+  "@mozilla.org/binaryoutputstream;1",
+  "nsIBinaryOutputStream",
+  "setOutputStream"
+);
+
+function handleRequest(request, response) {
+  var bodyStream = new BinaryInputStream(request.bodyInputStream);
+  var bodyBytes = [];
+  while ((bodyAvail = bodyStream.available()) > 0) {
+    Array.prototype.push.apply(bodyBytes, bodyStream.readByteArray(bodyAvail));
+  }
+
+  var bos = new BinaryOutputStream(response.bodyOutputStream);
+  bos.writeByteArray(bodyBytes, bodyBytes.length);
+}
diff --git a/dom/serviceworkers/test/service_worker.js b/dom/serviceworkers/test/service_worker.js
new file mode 100644
index 0000000000..90cb97ef82
--- /dev/null
+++ b/dom/serviceworkers/test/service_worker.js
@@ -0,0 +1,9 @@
+onmessage = function (e) {
+  self.clients.matchAll().then(function (res) {
+    if (!res.length) {
+      dump("Error: no clients are currently controlled.\n");
+      return;
+    }
+    res[0].postMessage(indexedDB ? { available: true } : { available: false });
+  });
+};
diff --git a/dom/serviceworkers/test/service_worker_client.html b/dom/serviceworkers/test/service_worker_client.html
new file mode 100644
index 0000000000..c1c98eaabb
--- /dev/null
+++ b/dom/serviceworkers/test/service_worker_client.html
@@ -0,0 +1,28 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>controlled page</title>
+<script class="testbody" type="text/javascript">
+  if (!parent) {
+      info("service_worker_client.html should not be launched directly!");
+  }
+
+  window.onload = function() {
+    navigator.serviceWorker.onmessage = function(msg) {
+      // Forward messages coming from the service worker to the test page.
+      parent.postMessage(msg.data, "*");
+    };
+    navigator.serviceWorker.ready.then(function(swr) {
+      parent.postMessage("READY", "*");
+    });
+  }
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/serviceworker.html b/dom/serviceworkers/test/serviceworker.html
new file mode 100644
index 0000000000..11edd001a2
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworker.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script>
+       navigator.serviceWorker.register("worker.js");
+    </script>
+  </head>
+  <body>
+    This is a test page.
+  </body>
+<html>
diff --git a/dom/serviceworkers/test/serviceworker_not_sharedworker.js b/dom/serviceworkers/test/serviceworker_not_sharedworker.js
new file mode 100644
index 0000000000..da0c98aea3
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworker_not_sharedworker.js
@@ -0,0 +1,20 @@
+function OnMessage(e) {
+  if (e.data.msg == "whoareyou") {
+    if ("ServiceWorker" in self) {
+      self.clients.matchAll().then(function (clients) {
+        clients[0].postMessage({ result: "serviceworker" });
+      });
+    } else {
+      port.postMessage({ result: "sharedworker" });
+    }
+  }
+}
+
+var port;
+onconnect = function (e) {
+  port = e.ports[0];
+  port.onmessage = OnMessage;
+  port.start();
+};
+
+onmessage = OnMessage;
diff --git a/dom/serviceworkers/test/serviceworker_wrapper.js b/dom/serviceworkers/test/serviceworker_wrapper.js
new file mode 100644
index 0000000000..a1538f43c4
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworker_wrapper.js
@@ -0,0 +1,92 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+//
+// ServiceWorker equivalent of worker_wrapper.js.
+
+let client;
+
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + ": " + msg + "\n");
+  client.postMessage({ type: "status", status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a === b) + "  =>  " + a + " | " + b + ": " + msg + "\n");
+  client.postMessage({
+    type: "status",
+    status: a === b,
+    msg: a + " === " + b + ": " + msg,
+  });
+}
+
+function workerTestArrayEquals(a, b) {
+  if (!Array.isArray(a) || !Array.isArray(b) || a.length != b.length) {
+    return false;
+  }
+  for (var i = 0, n = a.length; i < n; ++i) {
+    if (a[i] !== b[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function workerTestDone() {
+  client.postMessage({ type: "finish" });
+}
+
+function workerTestGetHelperData(cb) {
+  addEventListener("message", function workerTestGetHelperDataCB(e) {
+    if (e.data.type !== "returnHelperData") {
+      return;
+    }
+    removeEventListener("message", workerTestGetHelperDataCB);
+    cb(e.data.result);
+  });
+  client.postMessage({
+    type: "getHelperData",
+  });
+}
+
+function workerTestGetStorageManager(cb) {
+  addEventListener("message", function workerTestGetStorageManagerCB(e) {
+    if (e.data.type !== "returnStorageManager") {
+      return;
+    }
+    removeEventListener("message", workerTestGetStorageManagerCB);
+    cb(e.data.result);
+  });
+  client.postMessage({
+    type: "getStorageManager",
+  });
+}
+
+let completeInstall;
+
+addEventListener("message", function workerWrapperOnMessage(e) {
+  removeEventListener("message", workerWrapperOnMessage);
+  var data = e.data;
+  self.clients.matchAll({ includeUncontrolled: true }).then(function (clients) {
+    for (var i = 0; i < clients.length; ++i) {
+      if (clients[i].url.includes("message_receiver.html")) {
+        client = clients[i];
+        break;
+      }
+    }
+    try {
+      importScripts(data.script);
+    } catch (ex) {
+      client.postMessage({
+        type: "status",
+        status: false,
+        msg:
+          "worker failed to import " + data.script + "; error: " + ex.message,
+      });
+    }
+    completeInstall();
+  });
+});
+
+addEventListener("install", e => {
+  e.waitUntil(new Promise(resolve => (completeInstall = resolve)));
+});
diff --git a/dom/serviceworkers/test/serviceworkerinfo_iframe.html b/dom/serviceworkers/test/serviceworkerinfo_iframe.html
new file mode 100644
index 0000000000..24103d1757
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworkerinfo_iframe.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script>
+      window.onmessage = function (event) {
+        if (event.data !== "register") {
+          return;
+        }
+        var promise = navigator.serviceWorker.register("worker.js",
+                                                       { updateViaCache: 'all' });
+        window.onmessage = function (e) {
+          if (e.data !== "unregister") {
+            return;
+          }
+          promise.then(function (registration) {
+            registration.unregister();
+          });
+          window.onmessage = null;
+        };
+      };
+    </script>
+  </head>
+  <body>
+    This is a test page.
+  </body>
+<html>
diff --git a/dom/serviceworkers/test/serviceworkermanager_iframe.html b/dom/serviceworkers/test/serviceworkermanager_iframe.html
new file mode 100644
index 0000000000..4ea21010cb
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworkermanager_iframe.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script>
+      window.onmessage = function (event) {
+        if (event.data !== "register") {
+          return;
+        }
+        var promise = navigator.serviceWorker.register("worker.js");
+        window.onmessage = function (event1) {
+          if (event1.data !== "register") {
+            return;
+          }
+          promise = promise.then(function (registration) {
+            return navigator.serviceWorker.register("worker2.js");
+          });
+          window.onmessage = function (event2) {
+            if (event2.data !== "unregister") {
+              return;
+            }
+            promise.then(function (registration) {
+              registration.unregister();
+            });
+            window.onmessage = null;
+          };
+        };
+      };
+    </script>
+  </head>
+  <body>
+    This is a test page.
+  </body>
+<html>
diff --git a/dom/serviceworkers/test/serviceworkerregistrationinfo_iframe.html b/dom/serviceworkers/test/serviceworkerregistrationinfo_iframe.html
new file mode 100644
index 0000000000..8f382cf0dc
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworkerregistrationinfo_iframe.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script>
+      var reg;
+      window.onmessage = function (event) {
+        if (event.data !== "register") {
+          return;
+        }
+        var promise = navigator.serviceWorker.register("worker.js");
+        window.onmessage = function (e) {
+          if (e.data === "register") {
+            promise.then(function() {
+              return navigator.serviceWorker.register("worker2.js")
+                .then(function(registration) {
+                  reg = registration;
+                });
+            });
+          } else if (e.data === "unregister") {
+            reg.unregister();
+          }
+        };
+      };
+    </script>
+  </head>
+  <body>
+    This is a test page.
+  </body>
+<html>
diff --git a/dom/serviceworkers/test/sharedWorker_fetch.js b/dom/serviceworkers/test/sharedWorker_fetch.js
new file mode 100644
index 0000000000..89618c4e83
--- /dev/null
+++ b/dom/serviceworkers/test/sharedWorker_fetch.js
@@ -0,0 +1,30 @@
+var clients = new Array();
+clients.length = 0;
+
+var broadcast = function (message) {
+  var length = clients.length;
+  for (var i = 0; i < length; i++) {
+    port = clients[i];
+    port.postMessage(message);
+  }
+};
+
+onconnect = function (e) {
+  clients.push(e.ports[0]);
+  if (clients.length == 1) {
+    clients[0].postMessage("Connected");
+  } else if (clients.length == 2) {
+    broadcast("BothConnected");
+    clients[0].onmessage = function (msg) {
+      if (msg.data == "StartFetchWithWrongIntegrity") {
+        // The fetch will succeed because the integrity value is invalid and we
+        // are looking for the console message regarding the bad integrity value.
+        fetch("SharedWorker_SRIFailed.html", { integrity: "abc" }).then(
+          function () {
+            clients[0].postMessage("SRI_failed");
+          }
+        );
+      }
+    };
+  }
+};
diff --git a/dom/serviceworkers/test/simple_fetch_worker.js b/dom/serviceworkers/test/simple_fetch_worker.js
new file mode 100644
index 0000000000..09c82011e5
--- /dev/null
+++ b/dom/serviceworkers/test/simple_fetch_worker.js
@@ -0,0 +1,18 @@
+// A simple worker script that forward intercepted url to the controlled window.
+
+function responseMsg(msg) {
+  self.clients
+    .matchAll({
+      includeUncontrolled: true,
+      type: "window",
+    })
+    .then(clients => {
+      if (clients && clients.length) {
+        clients[0].postMessage(msg);
+      }
+    });
+}
+
+onfetch = function (e) {
+  responseMsg(e.request.url);
+};
diff --git a/dom/serviceworkers/test/simpleregister/index.html b/dom/serviceworkers/test/simpleregister/index.html
new file mode 100644
index 0000000000..99e4fe3f23
--- /dev/null
+++ b/dom/serviceworkers/test/simpleregister/index.html
@@ -0,0 +1,51 @@
+<html>
+  <head></head>
+  <body>
+      <script type="text/javascript">
+          var expectedEvents = 2;
+          function eventReceived() {
+            window.parent.postMessage({ type: "check", status: expectedEvents > 0, msg: "updatefound received" }, "*");
+
+            if (--expectedEvents) {
+              window.parent.postMessage({ type: "finish" }, "*");
+            }
+          }
+
+          navigator.serviceWorker.getRegistrations().then(function(a) {
+            window.parent.postMessage({ type: "check", status: Array.isArray(a),
+                                        msg: "getRegistrations returns an array" }, "*");
+            window.parent.postMessage({ type: "check", status: !!a.length,
+                                        msg: "getRegistrations returns an array with 1 item" }, "*");
+            for (var i = 0; i < a.length; ++i) {
+              window.parent.postMessage({ type: "check", status: a[i] instanceof ServiceWorkerRegistration,
+                                          msg: "getRegistrations returns an array of ServiceWorkerRegistration objects" }, "*");
+              if (a[i].scope.match(/simpleregister\//)) {
+                a[i].onupdatefound = function(e) {
+                  eventReceived();
+                }
+              }
+            }
+          });
+
+          navigator.serviceWorker.getRegistration('http://mochi.test:8888/tests/dom/serviceworkers/test/simpleregister/')
+            .then(function(a) {
+            window.parent.postMessage({ type: "check", status: a instanceof ServiceWorkerRegistration,
+                                        msg: "getRegistration returns a ServiceWorkerRegistration" }, "*");
+            a.onupdatefound = function(e) {
+              eventReceived();
+            }
+          });
+
+          navigator.serviceWorker.getRegistration('http://www.something_else.net/')
+            .then(function(a) {
+            window.parent.postMessage({ type: "check", status: false,
+                                        msg: "getRegistration should throw for security error!" }, "*");
+          }, function(a) {
+            window.parent.postMessage({ type: "check", status: true,
+                                        msg: "getRegistration should throw for security error!" }, "*");
+          });
+
+          window.parent.postMessage({ type: "ready" }, "*");
+      </script>
+  </body>
+</html>
diff --git a/dom/serviceworkers/test/simpleregister/ready.html b/dom/serviceworkers/test/simpleregister/ready.html
new file mode 100644
index 0000000000..6bc163e5f4
--- /dev/null
+++ b/dom/serviceworkers/test/simpleregister/ready.html
@@ -0,0 +1,14 @@
+<html>
+  <head></head>
+  <body>
+    <script type="text/javascript">
+
+      window.addEventListener('message', function(evt) {
+        navigator.serviceWorker.ready.then(function() {
+          evt.ports[0].postMessage("WOW!");
+        });
+      });
+
+    </script>
+  </body>
+</html>
diff --git a/dom/serviceworkers/test/skip_waiting_installed_worker.js b/dom/serviceworkers/test/skip_waiting_installed_worker.js
new file mode 100644
index 0000000000..a142576b9d
--- /dev/null
+++ b/dom/serviceworkers/test/skip_waiting_installed_worker.js
@@ -0,0 +1,6 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+self.addEventListener("install", evt => {
+  evt.waitUntil(self.skipWaiting());
+});
diff --git a/dom/serviceworkers/test/skip_waiting_scope/index.html b/dom/serviceworkers/test/skip_waiting_scope/index.html
new file mode 100644
index 0000000000..2b480d8707
--- /dev/null
+++ b/dom/serviceworkers/test/skip_waiting_scope/index.html
@@ -0,0 +1,33 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1131352 - Add ServiceWorkerGlobalScope skipWaiting()</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    info("skip_waiting_scope/index.html shouldn't be launched directly!");
+  }
+
+  navigator.serviceWorker.oncontrollerchange = function() {
+    parent.postMessage({
+      event: "controllerchange",
+      controllerScriptURL: navigator.serviceWorker.controller &&
+                           navigator.serviceWorker.controller.scriptURL
+    }, "*");
+  }
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/source_message_posting_worker.js b/dom/serviceworkers/test/source_message_posting_worker.js
new file mode 100644
index 0000000000..8ca6246c51
--- /dev/null
+++ b/dom/serviceworkers/test/source_message_posting_worker.js
@@ -0,0 +1,16 @@
+onmessage = function (e) {
+  if (!e.source) {
+    dump("ERROR: message doesn't have a source.");
+  }
+
+  if (!(e instanceof ExtendableMessageEvent)) {
+    e.source.postMessage("ERROR. event is not an extendable message event.");
+  }
+
+  // The client should be a window client
+  if (e.source instanceof WindowClient) {
+    e.source.postMessage(e.data);
+  } else {
+    e.source.postMessage("ERROR. source is not a window client.");
+  }
+};
diff --git a/dom/serviceworkers/test/storage_recovery_worker.sjs b/dom/serviceworkers/test/storage_recovery_worker.sjs
new file mode 100644
index 0000000000..9c9ce6a8d7
--- /dev/null
+++ b/dom/serviceworkers/test/storage_recovery_worker.sjs
@@ -0,0 +1,23 @@
+const BASE_URI = "http://mochi.test:8888/browser/dom/serviceworkers/test/";
+
+function handleRequest(request, response) {
+  let redirect = getState("redirect");
+  setState("redirect", "false");
+
+  if (request.queryString.includes("set-redirect")) {
+    setState("redirect", "true");
+  } else if (request.queryString.includes("clear-redirect")) {
+    setState("redirect", "false");
+  }
+
+  response.setHeader("Cache-Control", "no-store");
+
+  if (redirect === "true") {
+    response.setStatusLine(request.httpVersion, 307, "Moved Temporarily");
+    response.setHeader("Location", BASE_URI + "empty.js");
+    return;
+  }
+
+  response.setHeader("Content-Type", "application/javascript");
+  response.write("");
+}
diff --git a/dom/serviceworkers/test/streamfilter_server.sjs b/dom/serviceworkers/test/streamfilter_server.sjs
new file mode 100644
index 0000000000..8adf9d2eaf
--- /dev/null
+++ b/dom/serviceworkers/test/streamfilter_server.sjs
@@ -0,0 +1,7 @@
+function handleRequest(request, response) {
+  const searchParams = new URLSearchParams(request.queryString);
+
+  if (searchParams.get("syntheticResponse") === "0") {
+    response.write(String(searchParams));
+  }
+}
diff --git a/dom/serviceworkers/test/streamfilter_worker.js b/dom/serviceworkers/test/streamfilter_worker.js
new file mode 100644
index 0000000000..03a0f0a933
--- /dev/null
+++ b/dom/serviceworkers/test/streamfilter_worker.js
@@ -0,0 +1,9 @@
+onactivate = e => e.waitUntil(clients.claim());
+
+onfetch = e => {
+  const searchParams = new URL(e.request.url).searchParams;
+
+  if (searchParams.get("syntheticResponse") === "1") {
+    e.respondWith(new Response(String(searchParams)));
+  }
+};
diff --git a/dom/serviceworkers/test/strict_mode_warning.js b/dom/serviceworkers/test/strict_mode_warning.js
new file mode 100644
index 0000000000..4709b2b667
--- /dev/null
+++ b/dom/serviceworkers/test/strict_mode_warning.js
@@ -0,0 +1,5 @@
+function f() {
+  return 1;
+  // eslint-disable-next-line no-unreachable
+  return 2;
+}
diff --git a/dom/serviceworkers/test/sw_bad_mime_type.js b/dom/serviceworkers/test/sw_bad_mime_type.js
new file mode 100644
index 0000000000..f371807db9
--- /dev/null
+++ b/dom/serviceworkers/test/sw_bad_mime_type.js
@@ -0,0 +1 @@
+// I need some contents.
diff --git a/dom/serviceworkers/test/sw_bad_mime_type.js^headers^ b/dom/serviceworkers/test/sw_bad_mime_type.js^headers^
new file mode 100644
index 0000000000..a1f9e38d90
--- /dev/null
+++ b/dom/serviceworkers/test/sw_bad_mime_type.js^headers^
@@ -0,0 +1 @@
+Content-Type: text/plain
diff --git a/dom/serviceworkers/test/sw_clients/file_blob_upload_frame.html b/dom/serviceworkers/test/sw_clients/file_blob_upload_frame.html
new file mode 100644
index 0000000000..60b11c4e57
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/file_blob_upload_frame.html
@@ -0,0 +1,76 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>test file blob upload with SW interception</title>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+if (!parent) {
+  dump("sw_clients/file_blob_upload_frame.html shouldn't be launched directly!");
+}
+
+function makeFileBlob(obj) {
+  return new Promise(function(resolve, reject) {
+
+    var request = indexedDB.open(window.location.pathname, 1);
+    request.onerror = reject;
+    request.onupgradeneeded = function(evt) {
+      var db = evt.target.result;
+      db.onerror = reject;
+
+      var objectStore = db.createObjectStore('test', { autoIncrement: true });
+      var index = objectStore.createIndex('test', 'index');
+    };
+
+    request.onsuccess = function(evt) {
+      var db = evt.target.result;
+      db.onerror = reject;
+
+      var blob = new Blob([JSON.stringify(obj)],
+                          { type: 'application/json' });
+      var data = { blob, index: 5 };
+
+      objectStore = db.transaction('test', 'readwrite').objectStore('test');
+      objectStore.add(data).onsuccess = function(evt1) {
+        var key = evt1.target.result;
+        objectStore = db.transaction('test').objectStore('test');
+        objectStore.get(key).onsuccess = function(evt2) {
+          resolve(evt2.target.result.blob);
+        };
+      };
+    };
+  });
+}
+
+navigator.serviceWorker.ready.then(function() {
+  parent.postMessage({ status: 'READY' }, '*');
+});
+
+var URL = '/tests/dom/serviceworkers/test/redirect_post.sjs';
+
+addEventListener('message', function(evt) {
+  if (evt.data.type == 'TEST') {
+    makeFileBlob(evt.data.body).then(function(blob) {
+      return fetch(URL, { method: 'POST', body: blob });
+    }).then(function(response) {
+      return response.json();
+    }).then(function(result) {
+      parent.postMessage({ status: 'OK', result }, '*');
+    }).catch(function(e) {
+      parent.postMessage({ status: 'ERROR', result: e.toString() }, '*');
+    });
+  }
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_clients/navigator.html b/dom/serviceworkers/test/sw_clients/navigator.html
new file mode 100644
index 0000000000..16a4fe9189
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/navigator.html
@@ -0,0 +1,34 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - test match_all not crashing</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    dump("sw_clients/navigator.html shouldn't be launched directly!\n");
+  }
+
+  window.addEventListener("message", function(event) {
+    if (event.data.type === "NAVIGATE") {
+      window.location = event.data.url;
+    }
+  });
+
+  navigator.serviceWorker.ready.then(function() {
+    parent.postMessage("NAVIGATOR_READY", "*");
+  });
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_clients/refresher.html b/dom/serviceworkers/test/sw_clients/refresher.html
new file mode 100644
index 0000000000..b3c6e00152
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher.html
@@ -0,0 +1,38 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - test match_all not crashing</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <!-- some tests will intercept this bogus script request -->
+  <script type="text/javascript" src="does_not_exist.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    dump("sw_clients/simple.html shouldn't be launched directly!");
+  }
+
+  window.addEventListener("message", function(event) {
+    if (event.data === "REFRESH") {
+      window.location.reload();
+    } else if (event.data === "FORCE_REFRESH") {
+      window.location.reload(true);
+    }
+  });
+
+  navigator.serviceWorker.ready.then(function() {
+    parent.postMessage("READY", "*");
+  });
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_clients/refresher_cached.html b/dom/serviceworkers/test/sw_clients/refresher_cached.html
new file mode 100644
index 0000000000..4a91e46e99
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher_cached.html
@@ -0,0 +1,37 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - test match_all not crashing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    info("sw_clients/simple.html shouldn't be launched directly!");
+  }
+
+  window.addEventListener("message", function(event) {
+    if (event.data === "REFRESH") {
+      window.location.reload();
+    } else if (event.data === "FORCE_REFRESH") {
+      window.location.reload(true);
+    }
+  });
+
+  navigator.serviceWorker.ready.then(function() {
+    parent.postMessage("READY_CACHED", "*");
+  });
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html b/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html
new file mode 100644
index 0000000000..6b6a328211
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html
diff --git a/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html^headers^ b/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html^headers^
new file mode 100644
index 0000000000..4204d8601d
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher_cached_compressed.html^headers^
@@ -0,0 +1,2 @@
+Content-Type: text/html
+Content-Encoding: gzip
diff --git a/dom/serviceworkers/test/sw_clients/refresher_compressed.html b/dom/serviceworkers/test/sw_clients/refresher_compressed.html
new file mode 100644
index 0000000000..e0861a5180
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher_compressed.html
diff --git a/dom/serviceworkers/test/sw_clients/refresher_compressed.html^headers^ b/dom/serviceworkers/test/sw_clients/refresher_compressed.html^headers^
new file mode 100644
index 0000000000..4204d8601d
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/refresher_compressed.html^headers^
@@ -0,0 +1,2 @@
+Content-Type: text/html
+Content-Encoding: gzip
diff --git a/dom/serviceworkers/test/sw_clients/service_worker_controlled.html b/dom/serviceworkers/test/sw_clients/service_worker_controlled.html
new file mode 100644
index 0000000000..e0d7bce573
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/service_worker_controlled.html
@@ -0,0 +1,38 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>controlled page</title>
+  <!--
+    Paged controlled by a service worker for testing matchAll().
+    See bug 982726, 1058311.
+  -->
+<script class="testbody" type="text/javascript">
+  function fail(msg) {
+    info("service_worker_controlled.html: " + msg);
+    opener.postMessage("FAIL", "*");
+  }
+
+  if (!parent) {
+      info("service_worker_controlled.html should not be launched directly!");
+  }
+
+  window.onload = function() {
+    navigator.serviceWorker.ready.then(function(swr) {
+      parent.postMessage("READY", "*");
+    });
+  }
+
+  navigator.serviceWorker.onmessage = function(msg) {
+    // forward message to the test page.
+    parent.postMessage(msg.data, "*");
+  };
+</script>
+
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_clients/simple.html b/dom/serviceworkers/test/sw_clients/simple.html
new file mode 100644
index 0000000000..bbe6782e2a
--- /dev/null
+++ b/dom/serviceworkers/test/sw_clients/simple.html
@@ -0,0 +1,29 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - test match_all not crashing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    info("sw_clients/simple.html shouldn't be launched directly!");
+  }
+
+  navigator.serviceWorker.ready.then(function() {
+    parent.postMessage("READY", "*");
+  });
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/sw_file_upload.js b/dom/serviceworkers/test/sw_file_upload.js
new file mode 100644
index 0000000000..20c695614b
--- /dev/null
+++ b/dom/serviceworkers/test/sw_file_upload.js
@@ -0,0 +1,16 @@
+self.skipWaiting();
+
+addEventListener("fetch", event => {
+  const url = new URL(event.request.url);
+  const params = new URLSearchParams(url.search);
+
+  if (params.get("clone") === "1") {
+    event.respondWith(fetch(event.request.clone()));
+  } else {
+    event.respondWith(fetch(event.request));
+  }
+});
+
+addEventListener("activate", function (event) {
+  event.waitUntil(clients.claim());
+});
diff --git a/dom/serviceworkers/test/sw_respondwith_serviceworker.js b/dom/serviceworkers/test/sw_respondwith_serviceworker.js
new file mode 100644
index 0000000000..6ddbc3d5c1
--- /dev/null
+++ b/dom/serviceworkers/test/sw_respondwith_serviceworker.js
@@ -0,0 +1,24 @@
+const SERVICEWORKER_DOC = `<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="utils.js" type="text/javascript"></script>
+</head>
+<body>
+SERVICEWORKER
+</body>
+</html>
+`;
+
+const SERVICEWORKER_RESPONSE = new Response(SERVICEWORKER_DOC, {
+  headers: { "content-type": "text/html" },
+});
+
+addEventListener("fetch", event => {
+  // Allow utils.js which we explicitly include to be loaded by resetting
+  // interception.
+  if (event.request.url.endsWith("/utils.js")) {
+    return;
+  }
+  event.respondWith(SERVICEWORKER_RESPONSE.clone());
+});
diff --git a/dom/serviceworkers/test/sw_storage_not_allow.js b/dom/serviceworkers/test/sw_storage_not_allow.js
new file mode 100644
index 0000000000..2eb2403309
--- /dev/null
+++ b/dom/serviceworkers/test/sw_storage_not_allow.js
@@ -0,0 +1,33 @@
+let clientId;
+addEventListener("fetch", function (event) {
+  event.respondWith(
+    (async function () {
+      if (event.request.url.includes("getClients")) {
+        // Expected to fail since the storage access is not allowed.
+        try {
+          await self.clients.matchAll();
+        } catch (e) {
+          // expected failure
+        }
+      } else if (event.request.url.includes("getClient-stage1")) {
+        let clients = await self.clients.matchAll();
+        clientId = clients[0].id;
+      } else if (event.request.url.includes("getClient-stage2")) {
+        // Expected to fail since the storage access is not allowed.
+        try {
+          await self.clients.get(clientId);
+        } catch (e) {
+          // expected failure
+        }
+      }
+
+      // Pass through the network request once our various Clients API
+      // promises have completed.
+      return await fetch(event.request);
+    })()
+  );
+});
+
+addEventListener("activate", function (event) {
+  event.waitUntil(clients.claim());
+});
diff --git a/dom/serviceworkers/test/sw_with_navigationPreload.js b/dom/serviceworkers/test/sw_with_navigationPreload.js
new file mode 100644
index 0000000000..afd7181dcf
--- /dev/null
+++ b/dom/serviceworkers/test/sw_with_navigationPreload.js
@@ -0,0 +1,28 @@
+addEventListener("activate", event => {
+  event.waitUntil(self.registration.navigationPreload.enable());
+});
+
+async function post_to_page(data) {
+  let cs = await self.clients.matchAll();
+  for (const client of cs) {
+    client.postMessage(data);
+  }
+}
+
+addEventListener("fetch", event => {
+  if (event.request.url.includes("navigationPreload_page.html")) {
+    event.respondWith(
+      new Response("<!DOCTYPE html>", {
+        headers: { "Content-Type": "text/html; charset=utf-8" },
+      })
+    );
+
+    event.waitUntil(
+      (async function () {
+        let preloadResponse = await event.preloadResponse;
+        let text = await preloadResponse.text();
+        await post_to_page(text);
+      })()
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/swa/worker_scope_different.js b/dom/serviceworkers/test/swa/worker_scope_different.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_different.js
diff --git a/dom/serviceworkers/test/swa/worker_scope_different.js^headers^ b/dom/serviceworkers/test/swa/worker_scope_different.js^headers^
new file mode 100644
index 0000000000..e85a7f09de
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_different.js^headers^
@@ -0,0 +1 @@
+Service-Worker-Allowed: different/path
diff --git a/dom/serviceworkers/test/swa/worker_scope_different2.js b/dom/serviceworkers/test/swa/worker_scope_different2.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_different2.js
diff --git a/dom/serviceworkers/test/swa/worker_scope_different2.js^headers^ b/dom/serviceworkers/test/swa/worker_scope_different2.js^headers^
new file mode 100644
index 0000000000..e37307d666
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_different2.js^headers^
@@ -0,0 +1 @@
+Service-Worker-Allowed: /different/path
diff --git a/dom/serviceworkers/test/swa/worker_scope_precise.js b/dom/serviceworkers/test/swa/worker_scope_precise.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_precise.js
diff --git a/dom/serviceworkers/test/swa/worker_scope_precise.js^headers^ b/dom/serviceworkers/test/swa/worker_scope_precise.js^headers^
new file mode 100644
index 0000000000..7488cafbb0
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_precise.js^headers^
@@ -0,0 +1 @@
+Service-Worker-Allowed: /tests/dom/serviceworkers/test/swa
diff --git a/dom/serviceworkers/test/swa/worker_scope_too_deep.js b/dom/serviceworkers/test/swa/worker_scope_too_deep.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_too_deep.js
diff --git a/dom/serviceworkers/test/swa/worker_scope_too_deep.js^headers^ b/dom/serviceworkers/test/swa/worker_scope_too_deep.js^headers^
new file mode 100644
index 0000000000..9a66c3d153
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_too_deep.js^headers^
@@ -0,0 +1 @@
+Service-Worker-Allowed: /tests/dom/serviceworkers/test/swa/deep/way/too/specific
diff --git a/dom/serviceworkers/test/swa/worker_scope_too_narrow.js b/dom/serviceworkers/test/swa/worker_scope_too_narrow.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_too_narrow.js
diff --git a/dom/serviceworkers/test/swa/worker_scope_too_narrow.js^headers^ b/dom/serviceworkers/test/swa/worker_scope_too_narrow.js^headers^
new file mode 100644
index 0000000000..407361a3c7
--- /dev/null
+++ b/dom/serviceworkers/test/swa/worker_scope_too_narrow.js^headers^
@@ -0,0 +1 @@
+Service-Worker-Allowed: /tests/dom/serviceworkers
diff --git a/dom/serviceworkers/test/test_abrupt_completion.html b/dom/serviceworkers/test/test_abrupt_completion.html
new file mode 100644
index 0000000000..bbf9e965f0
--- /dev/null
+++ b/dom/serviceworkers/test/test_abrupt_completion.html
@@ -0,0 +1,144 @@
+<!doctype html>
+<meta charset=utf-8>
+<title></title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+
+// Tests a _registered_ ServiceWorker whose script evaluation results in an
+// "abrupt completion", e.g. threw an uncaught exception. Such a ServiceWorker's
+// first script evaluation must result in a "normal completion", however, for
+// the Update algorithm to not abort in its step 18 when registering:
+//
+// 18. If runResult is failure or an abrupt completion, then: [...]
+
+const script = "./abrupt_completion_worker.js";
+const scope = "./empty.html";
+const expectedMessage = "handler-before-throw";
+let registration = null;
+
+// Should only be called once registration.active is non-null. Uses
+// implementation details by zero-ing the "idle timeout"s and then sending  an
+// event to the ServiceWorker, which should immediately cause its termination.
+// The idle timeouts are restored after the ServiceWorker is terminated.
+async function startAndStopServiceWorker() {
+  SpecialPowers.registerObservers("service-worker-shutdown");
+
+  const spTopic = "specialpowers-service-worker-shutdown";
+
+  const origIdleTimeout =
+    SpecialPowers.getIntPref("dom.serviceWorkers.idle_timeout");
+
+  const origIdleExtendedTimeout =
+    SpecialPowers.getIntPref("dom.serviceWorkers.idle_extended_timeout");
+
+  await new Promise(resolve => {
+    const observer = {
+      async observe(subject, topic, data) {
+        if (topic !== spTopic) {
+          return;
+        }
+
+        SpecialPowers.removeObserver(observer, spTopic);
+
+        await SpecialPowers.pushPrefEnv({
+          set: [
+              ["dom.serviceWorkers.idle_timeout", origIdleTimeout],
+              ["dom.serviceWorkers.idle_extended_timeout", origIdleExtendedTimeout]
+            ]
+        });
+
+        resolve();
+      },
+    };
+
+    // Speed things up.
+    SpecialPowers.pushPrefEnv({
+      set: [
+          ["dom.serviceWorkers.idle_timeout", 0],
+          ["dom.serviceWorkers.idle_extended_timeout", 0]
+        ]
+    }).then(() => {
+      SpecialPowers.addObserver(observer, spTopic);
+
+      registration.active.postMessage("");
+    });
+  });
+}
+
+// eslint-disable-next-line mozilla/no-addtask-setup
+add_task(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.testing.enabled", true]
+      ]
+  });
+
+  registration = await navigator.serviceWorker.register(script, { scope });
+  SimpleTest.registerCleanupFunction(async function unregisterRegistration() {
+    await registration.unregister();
+  });
+
+  await new Promise(resolve => {
+    const serviceWorker = registration.installing;
+
+    serviceWorker.onstatechange = () => {
+      if (serviceWorker.state === "activated") {
+        resolve();
+      }
+    };
+  });
+
+  ok(registration.active instanceof ServiceWorker, "ServiceWorker is activated");
+});
+
+// We expect that the restarted SW that experiences an abrupt completion at
+// startup after adding its message handler 1) will be active in order to
+// respond to our postMessage and 2) will respond with the global value set
+// prior to the importScripts call that throws (and not the global value that
+// would have been assigned after the importScripts call if it didn't throw).
+add_task(async function testMessageHandler() {
+  await startAndStopServiceWorker();
+
+  await new Promise(resolve => {
+    navigator.serviceWorker.onmessage = e => {
+      is(e.data, expectedMessage, "Correct message handler");
+      resolve();
+    };
+    registration.active.postMessage("");
+  });
+});
+
+// We expect that the restarted SW that experiences an abrupt completion at
+// startup before adding its "fetch" listener will 1) successfully dispatch the
+// event and 2) it will not be handled (respondWith() will not be called) so
+// interception will be reset and the response will contain the contents of
+// empty.html. Before the fix in bug 1603484 the SW would fail to properly start
+// up and the fetch event would result in a NetworkError, breaking the
+// controlled page.
+add_task(async function testFetchHandler() {
+  await startAndStopServiceWorker();
+
+  const iframe = document.createElement("iframe");
+  SimpleTest.registerCleanupFunction(function removeIframe() {
+    iframe.remove();
+  });
+
+  await new Promise(resolve => {
+    iframe.src = scope;
+    iframe.onload = resolve;
+    document.body.appendChild(iframe);
+  });
+
+  const response = await iframe.contentWindow.fetch(scope);
+
+  // NetworkError will have a status of 0, which is not "ok", and this is
+  // a stronger guarantee that should be true instead of just checking if there
+  // isn't a NetworkError.
+  ok(response.ok, "Fetch succeeded and didn't result in a NetworkError");
+
+  const text = await response.text();
+  is(text, "", "Correct response text");
+});
+
+</script>
diff --git a/dom/serviceworkers/test/test_async_waituntil.html b/dom/serviceworkers/test/test_async_waituntil.html
new file mode 100644
index 0000000000..8c15eb2b11
--- /dev/null
+++ b/dom/serviceworkers/test/test_async_waituntil.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test that:
+  1. waitUntil() waits for each individual promise separately, even if
+     one of them was rejected.
+  2. waitUntil() can be called asynchronously as long as there is still
+     a pending extension promise.
+  -->
+<head>
+  <title>Test for Bug 1263304</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1263304">Mozilla Bug 1263304</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+function wait_for_message(expected_message) {
+  return new Promise(function(resolve, reject) {
+    navigator.serviceWorker.onmessage = function(event) {
+      navigator.serviceWorker.onmessage = null;
+      ok(event.data === expected_message, "Received expected message event: " + event.data);
+      resolve();
+    }
+  });
+}
+
+add_task(async function async_wait_until() {
+  var worker;
+  let registration = await navigator.serviceWorker.register(
+    "async_waituntil_worker.js", { scope: "./"} )
+    .then(function(reg) {
+      worker = reg.installing;
+      return waitForState(worker, 'activated', reg);
+    });
+
+  // The service worker will claim us when it becomes active.
+  ok(navigator.serviceWorker.controller, "Controlled");
+
+  // This will make the service worker die immediately if there are no pending
+  // waitUntil promises to keep it alive.
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.idle_timeout", 0],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999]]});
+
+  // The service worker will wait on two promises, one of which
+  // will be rejected. We check whether the SW is killed using
+  // the value of a global variable.
+  let waitForStart = wait_for_message("Started");
+  worker.postMessage("Start");
+  await waitForStart;
+
+  await new Promise((res, rej) => {
+    setTimeout(res, 0);
+  });
+
+  let waitResult = wait_for_message("Success");
+  worker.postMessage("Result");
+  await waitResult;
+
+  // Test the behaviour of calling waitUntil asynchronously. The important
+  // part is that we receive the message event.
+  let waitForMessage = wait_for_message("Done");
+  await fetch("doesnt_exist.html").then(() => {
+    ok(true, "Fetch was successful.");
+  });
+  await waitForMessage;
+
+  await SpecialPowers.popPrefEnv();
+  await SpecialPowers.popPrefEnv();
+  await registration.unregister();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_bad_script_cache.html b/dom/serviceworkers/test/test_bad_script_cache.html
new file mode 100644
index 0000000000..93df0c37bb
--- /dev/null
+++ b/dom/serviceworkers/test/test_bad_script_cache.html
@@ -0,0 +1,95 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test updating a service worker with a bad script cache.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script src='utils.js'></script>
+<script class="testbody" type="text/javascript">
+
+async function deleteCaches(cacheStorage) {
+  let keyList = await cacheStorage.keys();
+  let promiseList = [];
+  keyList.forEach(key => {
+    promiseList.push(cacheStorage.delete(key));
+  });
+  return await Promise.all(keyList);
+}
+
+function waitForUpdate(reg) {
+  return new Promise(resolve => {
+    reg.addEventListener('updatefound', resolve, { once: true });
+  });
+}
+
+async function runTest() {
+  let reg;
+  try {
+    const script = 'update_worker.sjs';
+    const scope = 'bad-script-cache';
+
+    reg = await navigator.serviceWorker.register(script, { scope });
+    await waitForState(reg.installing, 'activated');
+
+    // Verify the service worker script cache has the worker script stored.
+    let chromeCaches = SpecialPowers.createChromeCache('chrome', window.origin);
+    let scriptURL = new URL(script, window.location.href);
+    let response = await chromeCaches.match(scriptURL.href);
+    is(response.url, scriptURL.href, 'worker script should be stored');
+
+    // Force delete the service worker script out from under the service worker.
+    // Note: Prefs are set to kill the SW thread immediately on idle.
+    await deleteCaches(chromeCaches);
+
+    // Verify the service script cache no longer knows about the worker script.
+    response = await chromeCaches.match(scriptURL.href);
+    is(response, undefined, 'worker script should not be stored');
+
+    // Force an update and wait for it to fire an update event.
+    reg.update();
+    await waitForUpdate(reg);
+    await waitForState(reg.installing, 'activated');
+
+    // Verify that the script cache knows about the worker script again.
+    response = await chromeCaches.match(scriptURL.href);
+    is(response.url, scriptURL.href, 'worker script should be stored');
+  } catch (e) {
+    ok(false, e);
+  }
+  if (reg) {
+    await reg.unregister();
+  }
+
+  // If this test is run on windows and the process shuts down immediately after, then
+  // we may fail to remove some of the Cache API body files.  This is because the GC
+  // runs late causing Cache API to cleanup after shutdown begins.  It seems something
+  // during shutdown scans these files and conflicts with removing the file on windows.
+  //
+  // To avoid this we perform an explict GC here to ensure that Cache API can cleanup
+  // earlier.
+  await new Promise(resolve => SpecialPowers.exactGC(resolve));
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [
+  // standard prefs
+  ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+  ["dom.serviceWorkers.enabled", true],
+  ["dom.serviceWorkers.testing.enabled", true],
+
+  // immediately kill the service worker thread when idle
+  ["dom.serviceWorkers.idle_timeout", 0],
+
+]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_bug1151916.html b/dom/serviceworkers/test/test_bug1151916.html
new file mode 100644
index 0000000000..1cb0c1b100
--- /dev/null
+++ b/dom/serviceworkers/test/test_bug1151916.html
@@ -0,0 +1,103 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1151916 - Test principal is set on cached serviceworkers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+<!--
+  If the principal is not set, accessing self.caches in the worker will crash.
+-->
+</head>
+<body>
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var frame;
+
+  function listenForMessage() {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data.status == "failed") {
+          ok(false, "iframe had error " + e.data.message);
+          reject(e.data.message);
+        } else if (e.data.status == "success") {
+          ok(true, "iframe step success " + e.data.message);
+          resolve(e.data.message);
+        } else {
+          ok(false, "Unexpected message " + e.data);
+          reject();
+        }
+      }
+    });
+
+    return p;
+  }
+
+  // We have the iframe register for its own scope so that this page is not
+  // holding any references when we GC.
+  function register() {
+    var p = listenForMessage();
+
+    frame = document.createElement("iframe");
+    document.body.appendChild(frame);
+    frame.src = "bug1151916_driver.html";
+
+    return p;
+  }
+
+  function unloadFrame() {
+    frame.src = "about:blank";
+    frame.remove();
+    frame = null;
+  }
+
+  function gc() {
+   return new Promise(function(resolve) {
+     SpecialPowers.exactGC(resolve);
+   });
+  }
+
+  function testCaches() {
+    var p = listenForMessage();
+
+    frame = document.createElement("iframe");
+    document.body.appendChild(frame);
+    frame.src = "bug1151916_driver.html";
+
+    return p;
+  }
+
+  function unregister() {
+    return navigator.serviceWorker.getRegistration("./bug1151916_driver.html").then(function(reg) {
+      ok(reg instanceof ServiceWorkerRegistration, "Must have valid registration.");
+      return reg.unregister();
+    });
+  }
+
+  function runTest() {
+     register()
+      .then(unloadFrame)
+      .then(gc)
+      .then(testCaches)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_bug1240436.html b/dom/serviceworkers/test/test_bug1240436.html
new file mode 100644
index 0000000000..8b76ada6a8
--- /dev/null
+++ b/dom/serviceworkers/test/test_bug1240436.html
@@ -0,0 +1,34 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for encoding of service workers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  SimpleTest.waitForExplicitFinish();
+
+  function runTest() {
+    navigator.serviceWorker.register("bug1240436_worker.js")
+      .then(reg => reg.unregister())
+      .then(() => ok(true, "service worker register script succeed"))
+      .catch(err => ok(false, "service worker register script faled " + err))
+      .then(() => SimpleTest.finish());
+  }
+
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_bug1408734.html b/dom/serviceworkers/test/test_bug1408734.html
new file mode 100644
index 0000000000..27559e695f
--- /dev/null
+++ b/dom/serviceworkers/test/test_bug1408734.html
@@ -0,0 +1,52 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1408734</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <script src="utils.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+// setup prefs
+add_task(() => {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+// test for bug 1408734
+add_task(async () => {
+  // register a service worker
+  let registration = await navigator.serviceWorker.register("fetch.js",
+                                                            {scope: "./"});
+  // wait for service worker be activated
+  await waitForState(registration.installing, "activated");
+
+  // get the ServiceWorkerRegistration we just register through GetRegistration
+  registration = await navigator.serviceWorker.getRegistration("./");
+  ok(registration, "should get the registration under scope './'");
+
+  // call unregister()
+  await registration.unregister();
+
+  // access registration.updateViaCache to trigger the bug
+  // we really care that we don't crash. In the future we will fix
+  is(registration.updateViaCache, "imports",
+     "registration.updateViaCache should work after unregister()");
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_claim.html b/dom/serviceworkers/test/test_claim.html
new file mode 100644
index 0000000000..e72f1173e8
--- /dev/null
+++ b/dom/serviceworkers/test/test_claim.html
@@ -0,0 +1,171 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1130684 - Test service worker clients claim onactivate </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  var registration_1;
+  var registration_2;
+  var client;
+
+  function register_1() {
+    return navigator.serviceWorker.register("claim_worker_1.js",
+                                            { scope: "./" })
+      .then((swr) => registration_1 = swr);
+  }
+
+  function register_2() {
+    return navigator.serviceWorker.register("claim_worker_2.js",
+                                            { scope: "./claim_clients/client.html" })
+      .then((swr) => registration_2 = swr);
+  }
+
+  function unregister(reg) {
+    return reg.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    });
+  }
+
+  function createClient() {
+    var p = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          res();
+        }
+      }
+    });
+
+    content = document.getElementById("content");
+    ok(content, "parent exists.");
+
+    client = document.createElement("iframe");
+    client.setAttribute('src', "claim_clients/client.html");
+    content.appendChild(client);
+
+    return p;
+  }
+
+  function testController() {
+    ok(navigator.serviceWorker.controller.scriptURL.match("claim_worker_1"),
+        "Controlling service worker has the correct url.");
+  }
+
+  function testClientWasClaimed(expected) {
+    var resolveClientMessage, resolveClientControllerChange;
+    var messageFromClient = new Promise(function(res, rej) {
+      resolveClientMessage = res;
+    });
+    var controllerChangeFromClient = new Promise(function(res, rej) {
+      resolveClientControllerChange = res;
+    });
+    window.onmessage = function(e) {
+      if (!e.data.event) {
+        ok(false, "Unknown message received: " + e.data);
+      }
+
+      if (e.data.event === "controllerchange") {
+        ok(e.data.controller,
+           "Client was claimed and received controllerchange event.");
+        resolveClientControllerChange();
+      }
+
+      if (e.data.event === "message") {
+        ok(e.data.data.resolve_value === undefined,
+            "Claim should resolve with undefined.");
+        ok(e.data.data.message === expected.message,
+           "Client received message from claiming worker.");
+        ok(e.data.data.match_count_before === expected.match_count_before,
+            "MatchAll clients count before claim should be " + expected.match_count_before);
+        ok(e.data.data.match_count_after === expected.match_count_after,
+            "MatchAll clients count after claim should be " + expected.match_count_after);
+        resolveClientMessage();
+      }
+    }
+
+    return Promise.all([messageFromClient, controllerChangeFromClient])
+      .then(() => window.onmessage = null);
+  }
+
+  function testClaimFirstWorker() {
+    // wait for the worker to control us
+    var controllerChange = new Promise(function(res, rej) {
+      navigator.serviceWorker.oncontrollerchange = function(e) {
+        ok(true, "controller changed event received.");
+        res();
+      };
+    });
+
+    var messageFromWorker = new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function(e) {
+        ok(e.data.resolve_value === undefined,
+            "Claim should resolve with undefined.");
+        ok(e.data.message === "claim_worker_1",
+            "Received message from claiming worker.");
+        ok(e.data.match_count_before === 0,
+            "Worker doesn't control any client before claim.");
+        ok(e.data.match_count_after === 2, "Worker should claim 2 clients.");
+        res();
+      }
+    });
+
+    var clientClaim = testClientWasClaimed({
+      message: "claim_worker_1",
+      match_count_before: 0,
+      match_count_after: 2
+    });
+
+    return Promise.all([controllerChange, messageFromWorker, clientClaim])
+      .then(testController);
+  }
+
+  function testClaimSecondWorker() {
+    navigator.serviceWorker.oncontrollerchange = function(e) {
+      ok(false, "Claim_worker_2 shouldn't claim this window.");
+    }
+
+    navigator.serviceWorker.onmessage = function(e) {
+      ok(false, "Claim_worker_2 shouldn't claim this window.");
+    }
+
+    var clientClaim = testClientWasClaimed({
+      message: "claim_worker_2",
+      match_count_before: 0,
+      match_count_after: 1
+    });
+
+    return clientClaim.then(testController);
+  }
+
+  function runTest() {
+    createClient()
+      .then(register_1)
+      .then(testClaimFirstWorker)
+      .then(register_2)
+      .then(testClaimSecondWorker)
+      .then(function() { return unregister(registration_1); })
+      .then(function() { return unregister(registration_2); })
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_claim_oninstall.html b/dom/serviceworkers/test/test_claim_oninstall.html
new file mode 100644
index 0000000000..54933405ce
--- /dev/null
+++ b/dom/serviceworkers/test/test_claim_oninstall.html
@@ -0,0 +1,77 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1130684 - Test service worker clients.claim oninstall</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  var registration;
+
+  function register() {
+    return navigator.serviceWorker.register("claim_oninstall_worker.js",
+                                            { scope: "./" })
+      .then((swr) => registration = swr);
+  }
+
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    });
+  }
+
+  function testClaim() {
+    ok(registration.installing, "Worker should be in installing state");
+
+    navigator.serviceWorker.oncontrollerchange = function() {
+      ok(false, "Claim should not succeed when the worker is not active.");
+    }
+
+    var p = new Promise(function(res, rej) {
+      var worker = registration.installing;
+      worker.onstatechange = function(e) {
+        if (worker.state === 'installed') {
+          is(worker, registration.waiting, "Worker should be in waiting state");
+        } else if (worker.state === 'activated') {
+          // The worker will become active only if claim will reject inside the
+          // install handler.
+          is(worker, registration.active,
+             "Claim should reject if the worker is not active");
+          ok(navigator.serviceWorker.controller === null, "Client is not controlled.");
+          e.target.onstatechange = null;
+          res();
+        }
+      }
+    });
+
+    return p;
+  }
+
+  function runTest() {
+    register()
+      .then(testClaim)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_controller.html b/dom/serviceworkers/test/test_controller.html
new file mode 100644
index 0000000000..c0e220a36e
--- /dev/null
+++ b/dom/serviceworkers/test/test_controller.html
@@ -0,0 +1,83 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1002570 - test controller instance.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+
+  var content;
+  var iframe;
+  var registration;
+
+  function simpleRegister() {
+    // We use the control scope for the less specific registration. The window will register a worker on controller/
+    return navigator.serviceWorker.register("worker.js", { scope: "./control" })
+      .then(swr => waitForState(swr.installing, 'activated', swr))
+      .then(swr => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed: " + e + "\n");
+    });
+  }
+
+  function testController() {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data.status == "ok") {
+          ok(e.data.result, e.data.message);
+        } else if (e.data.status == "done") {
+          window.onmessage = null;
+          content.removeChild(iframe);
+          resolve();
+        }
+      }
+    });
+
+    content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "controller/index.html");
+    content.appendChild(iframe);
+
+    return p;
+  }
+
+  // This document just flips the prefs and opens the iframe for the actual test.
+  function runTest() {
+    simpleRegister()
+      .then(testController)
+      .then(unregister)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_cookie_fetch.html b/dom/serviceworkers/test/test_cookie_fetch.html
new file mode 100644
index 0000000000..8c4324c759
--- /dev/null
+++ b/dom/serviceworkers/test/test_cookie_fetch.html
@@ -0,0 +1,64 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1331680 - test access to cookies in the documents synthesized from service worker responses</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/cookie/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        // Remove the iframe and recreate a new one to ensure that any traces
+        // of the cookies have been removed from the child process.
+        iframe.remove();
+        iframe = document.createElement("iframe");
+        document.getElementById("content").appendChild(iframe);
+
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/cookie/synth.html";
+      } else if (e.data.status == "done") {
+        // Note, we can't do an exact is() comparison here since other
+        // tests can leave cookies on the domain.
+        ok(e.data.cookie.includes("foo=bar"),
+           "The synthesized document has access to its cookies");
+
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/cookie/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SpecialPowers.clearUserPref("network.cookie.sameSite.laxByDefault");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      // Bug 1617611: Fix all the tests broken by "cookies SameSite=lax by default"
+      ["network.cookie.sameSite.laxByDefault", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_cross_origin_url_after_redirect.html b/dom/serviceworkers/test/test_cross_origin_url_after_redirect.html
new file mode 100644
index 0000000000..bfd4f700be
--- /dev/null
+++ b/dom/serviceworkers/test/test_cross_origin_url_after_redirect.html
@@ -0,0 +1,50 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test access to a cross origin Request.url property from a service worker for a redirected intercepted iframe</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/requesturl/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/requesturl/index.html";
+      } else if (e.data.status == "done") {
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/requesturl/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_csp_upgrade-insecure_intercept.html b/dom/serviceworkers/test/test_csp_upgrade-insecure_intercept.html
new file mode 100644
index 0000000000..b5ddbb97b6
--- /dev/null
+++ b/dom/serviceworkers/test/test_csp_upgrade-insecure_intercept.html
@@ -0,0 +1,55 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that a CSP upgraded request can be intercepted by a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/upgrade-insecure/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/upgrade-insecure/embedder.html";
+      } else if (e.data.status == "protocol") {
+        is(e.data.data, "https:", "Correct protocol expected");
+      } else if (e.data.status == "image") {
+        is(e.data.data, 40, "The image request was upgraded before interception");
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/upgrade-insecure/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      // This is needed so that we can test upgrading a non-secure load inside an https iframe.
+      ["security.mixed_content.block_active_content", false],
+      ["security.mixed_content.block_display_content", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_devtools_bypass_serviceworker.html b/dom/serviceworkers/test/test_devtools_bypass_serviceworker.html
new file mode 100644
index 0000000000..ec73f59dc0
--- /dev/null
+++ b/dom/serviceworkers/test/test_devtools_bypass_serviceworker.html
@@ -0,0 +1,106 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title> Verify devtools can utilize nsIChannel::LOAD_BYPASS_SERVICE_WORKER to bypass the service worker </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<body>
+<div id="content" style="display: none"></div>
+<script src="utils.js"></script>
+<script type="text/javascript">
+"use strict";
+
+async function testBypassSW () {
+  let Ci = SpecialPowers.Ci;
+
+  // Bypass SW imitates the "Disable Cache" option in dev-tools.
+  // Note: if we put the setter/getter into dev-tools, we should take care of
+  // the implementation of enabling/disabling cache since it just overwrite the
+  // defaultLoadFlags of docShell.
+  function setBypassServiceWorker(aDocShell, aBypass) {
+    if (aBypass) {
+      aDocShell.defaultLoadFlags |= Ci.nsIChannel.LOAD_BYPASS_SERVICE_WORKER;
+      return;
+    }
+
+    aDocShell.defaultLoadFlags &= ~Ci.nsIChannel.LOAD_BYPASS_SERVICE_WORKER;
+  }
+
+  function getBypassServiceWorker(aDocShell) {
+    return !!(aDocShell.defaultLoadFlags &
+              Ci.nsIChannel.LOAD_BYPASS_SERVICE_WORKER);
+  }
+
+  async function fetchFakeDocAndCheckIfIntercepted(aWindow) {
+    const fakeDoc = "fake.html";
+
+    // Note: The fetching document doesn't exist, so the expected status of the
+    //       repsonse is 404 unless the request is hijacked.
+    let response = await aWindow.fetch(fakeDoc);
+    if (response.status === 404) {
+      return false;
+    } else if (!response.ok) {
+      throw(response.statusText);
+    }
+
+    let text = await response.text();
+    if (text.includes("Hello")) {
+      // Intercepted
+      return true;
+    }
+
+    throw("Unexpected error");
+  }
+
+  let docShell = SpecialPowers.wrap(window).docShell;
+
+  info("Test 1: Enable bypass service worker for the docShell");
+
+  setBypassServiceWorker(docShell, true);
+  ok(getBypassServiceWorker(docShell),
+     "The loadFlags in docShell does bypass the serviceWorker by default");
+
+  let intercepted = await fetchFakeDocAndCheckIfIntercepted(window);
+  ok(!intercepted,
+     "The fetched document wasn't intercepted by the serviceWorker");
+
+  info("Test 2: Disable the bypass service worker for the docShell");
+
+  setBypassServiceWorker(docShell, false);
+  ok(!getBypassServiceWorker(docShell),
+     "The loadFlags in docShell doesn't bypass the serviceWorker by default");
+
+  intercepted = await fetchFakeDocAndCheckIfIntercepted(window);
+  ok(intercepted,
+     "The fetched document was intercepted by the serviceWorker");
+}
+
+// (This doesn't really need to be its own task, but it allows the actual test
+// case to be self-contained.)
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+add_task(async function test_bypassServiceWorker() {
+  const swURL = "fetch.js";
+  let registration = await navigator.serviceWorker.register(swURL);
+  await waitForState(registration.installing, 'activated');
+
+  try {
+    await testBypassSW();
+  } catch (e) {
+    ok(false, "Reason:" + e);
+  }
+
+  await registration.unregister();
+});
+
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_devtools_track_serviceworker_time.html b/dom/serviceworkers/test/test_devtools_track_serviceworker_time.html
new file mode 100644
index 0000000000..ac27ebcd33
--- /dev/null
+++ b/dom/serviceworkers/test/test_devtools_track_serviceworker_time.html
@@ -0,0 +1,236 @@
+<html>
+<head>
+  <title>Bug 1251238 - track service worker install time</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+</head>
+<iframe id="iframe"></iframe>
+<body>
+
+<script type="text/javascript">
+
+const State = {
+  BYTECHECK: -1,
+  PARSED: Ci.nsIServiceWorkerInfo.STATE_PARSED,
+  INSTALLING: Ci.nsIServiceWorkerInfo.STATE_INSTALLING,
+  INSTALLED: Ci.nsIServiceWorkerInfo.STATE_INSTALLED,
+  ACTIVATING: Ci.nsIServiceWorkerInfo.STATE_ACTIVATING,
+  ACTIVATED: Ci.nsIServiceWorkerInfo.STATE_ACTIVATED,
+  REDUNDANT: Ci.nsIServiceWorkerInfo.STATE_REDUNDANT
+};
+let swm = Cc["@mozilla.org/serviceworkers/manager;1"].
+          getService(Ci.nsIServiceWorkerManager);
+
+let EXAMPLE_URL = "https://example.com/chrome/dom/serviceworkers/test/";
+
+let swrlistener = null;
+let registrationInfo = null;
+
+// Use it to keep the sw after unregistration.
+let astrayServiceWorkerInfo = null;
+
+let expectedResults = [
+  {
+    // Speacial state for verifying update since we will do the byte-check
+    // first.
+    state: State.BYTECHECK, installedTimeRecorded: false,
+    activatedTimeRecorded: false, redundantTimeRecorded: false
+  },
+  {
+    state: State.PARSED, installedTimeRecorded: false,
+    activatedTimeRecorded: false, redundantTimeRecorded: false
+  },
+  {
+    state: State.INSTALLING, installedTimeRecorded: false,
+    activatedTimeRecorded: false, redundantTimeRecorded: false
+  },
+  {
+    state: State.INSTALLED, installedTimeRecorded: true,
+    activatedTimeRecorded: false, redundantTimeRecorded: false
+  },
+  {
+    state: State.ACTIVATING, installedTimeRecorded: true,
+    activatedTimeRecorded: false, redundantTimeRecorded: false
+  },
+  {
+    state: State.ACTIVATED, installedTimeRecorded: true,
+    activatedTimeRecorded: true, redundantTimeRecorded: false
+  },
+
+  // When first being marked as unregistered (but the worker can remain
+  // actively controlling pages)
+  {
+    state: State.ACTIVATED, installedTimeRecorded: true,
+    activatedTimeRecorded: true, redundantTimeRecorded: false
+  },
+  // When cleared (when idle)
+  {
+    state: State.REDUNDANT, installedTimeRecorded: true,
+    activatedTimeRecorded: true, redundantTimeRecorded: true
+  },
+];
+
+function waitForRegister(aScope, aCallback) {
+  return new Promise(function (aResolve) {
+    let listener = {
+      onRegister (aRegistration) {
+        if (aRegistration.scope !== aScope) {
+          return;
+        }
+        swm.removeListener(listener);
+        registrationInfo = aRegistration;
+        aResolve();
+      }
+    };
+    swm.addListener(listener);
+  });
+}
+
+function waitForUnregister(aScope) {
+  return new Promise(function (aResolve) {
+    let listener = {
+      onUnregister (aRegistration) {
+        if (aRegistration.scope !== aScope) {
+          return;
+        }
+        swm.removeListener(listener);
+        aResolve();
+      }
+    };
+    swm.addListener(listener);
+  });
+}
+
+function register() {
+  info("Register a ServiceWorker in the iframe");
+
+  let iframe = document.querySelector("iframe");
+  iframe.src = EXAMPLE_URL + "serviceworkerinfo_iframe.html";
+
+  let promise = new Promise(function(aResolve) {
+    iframe.onload = aResolve;
+  });
+
+  return promise.then(function() {
+    iframe.contentWindow.postMessage("register", "*");
+    return waitForRegister(EXAMPLE_URL);
+  })
+}
+
+function verifyServiceWorkTime(aSWRInfo, resolve) {
+  let expectedResult = expectedResults.shift();
+  ok(!!expectedResult, "We should be able to get test from expectedResults");
+
+  info("Check the ServiceWorker time in its state is " + expectedResult.state);
+
+  // Get serviceWorkerInfo from swrInfo or get the astray one which we hold.
+  let swInfo = aSWRInfo.evaluatingWorker ||
+               aSWRInfo.installingWorker ||
+               aSWRInfo.waitingWorker ||
+               aSWRInfo.activeWorker ||
+               astrayServiceWorkerInfo;
+
+  ok(!!aSWRInfo.lastUpdateTime,
+     "We should do the byte-check and update the update timeStamp");
+
+  if (!swInfo) {
+    is(expectedResult.state, State.BYTECHECK,
+       "We shouldn't get sw when we are notified for first time updating");
+    return;
+  }
+
+  ok(!!swInfo);
+
+  is(expectedResult.state, swInfo.state,
+     "The service worker's state should be " + swInfo.state + ", but got " +
+     expectedResult.state);
+
+  is(expectedResult.installedTimeRecorded, !!swInfo.installedTime,
+     "InstalledTime should be recorded when their state is greater than " +
+     "INSTALLING");
+
+  is(expectedResult.activatedTimeRecorded, !!swInfo.activatedTime,
+     "ActivatedTime should be recorded when their state is greater than " +
+     "ACTIVATING");
+
+  is(expectedResult.redundantTimeRecorded, !!swInfo.redundantTime,
+     "RedundantTime should be recorded when their state is REDUNDANT");
+
+  // We need to hold sw to avoid losing it since we'll unregister the swr later.
+  if (expectedResult.state === State.ACTIVATED) {
+    astrayServiceWorkerInfo = aSWRInfo.activeWorker;
+
+    // Resolve the promise for testServiceWorkerInfo after sw is activated.
+    resolve();
+  }
+}
+
+function testServiceWorkerInfo() {
+  info("Listen onChange event and verify service worker's information");
+
+  let promise_resolve;
+  let promise = new Promise(aResolve => promise_resolve = aResolve);
+
+  swrlistener = {
+    onChange: () => {
+      verifyServiceWorkTime(registrationInfo, promise_resolve);
+    }
+  };
+
+  registrationInfo.addListener(swrlistener);
+
+  return promise;
+}
+
+async function testHttpCacheUpdateTime() {
+  let iframe = document.querySelector("iframe");
+  let reg = await iframe.contentWindow.navigator.serviceWorker.getRegistration();
+  let lastUpdateTime = registrationInfo.lastUpdateTime;
+  await reg.update();
+  is(lastUpdateTime, registrationInfo.lastUpdateTime,
+     "The update time should not change when SW script is read from http cache.");
+}
+
+function unregister() {
+  info("Unregister the ServiceWorker");
+
+  let iframe = document.querySelector("iframe");
+  iframe.contentWindow.postMessage("unregister", "*");
+  return waitForUnregister(EXAMPLE_URL);
+}
+
+function cleanAll() {
+  return new Promise((aResolve, aReject) => {
+    is(expectedResults.length, 0, "All the tests should be tested");
+
+    registrationInfo.removeListener(swrlistener);
+
+    swm = null;
+    swrlistener = null;
+    registrationInfo = null;
+    astrayServiceWorkerInfo = null;
+    aResolve();
+  })
+}
+
+function runTest() {
+  return Promise.resolve()
+    .then(register)
+    .then(testServiceWorkerInfo)
+    .then(testHttpCacheUpdateTime)
+    .then(unregister)
+    .catch(aError => ok(false, "Some test failed with error " + aError))
+    .then(cleanAll)
+    .then(SimpleTest.finish);
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [
+  ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+  ["dom.serviceWorkers.enabled", true],
+  ["dom.serviceWorkers.testing.enabled", true]
+]}, runTest);
+
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_empty_serviceworker.html b/dom/serviceworkers/test/test_empty_serviceworker.html
new file mode 100644
index 0000000000..00b77939f8
--- /dev/null
+++ b/dom/serviceworkers/test/test_empty_serviceworker.html
@@ -0,0 +1,46 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that registering an empty service worker works</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function runTest() {
+    navigator.serviceWorker.ready.then(done);
+    navigator.serviceWorker.register("empty.js", {scope: "."});
+  }
+
+  function done(registration) {
+    ok(registration.waiting || registration.active, "registration worked");
+    registration.unregister().then(function(success) {
+      ok(success, "unregister worked");
+      SimpleTest.finish();
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+      SimpleTest.finish();
+    });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true]
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_enabled_pref.html b/dom/serviceworkers/test/test_enabled_pref.html
new file mode 100644
index 0000000000..b821fdaf5a
--- /dev/null
+++ b/dom/serviceworkers/test/test_enabled_pref.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1645054 - test dom.serviceWorkers.enabled preference</title>
+</head>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="utils.js"></script>
+<script>
+
+  function create_iframe(url) {
+    return new Promise(function(res) {
+      iframe = document.createElement('iframe');
+      iframe.src = url;
+      iframe.onload = function() { res(iframe) }
+      document.body.appendChild(iframe);
+    });
+  }
+
+  async function do_fetch(pref) {
+    await SpecialPowers.pushPrefEnv({ set: [pref] });
+
+    let iframe = await create_iframe("./pref/fetch_nonexistent_file.html");
+    let status = await iframe.contentWindow.fetch_status();
+
+    await SpecialPowers.popPrefEnv();
+    return status;
+  }
+
+  add_task(async () => {
+    await SpecialPowers.pushPrefEnv({
+      set: [['dom.serviceWorkers.testing.enabled', true]]
+    });
+
+    let reg = await navigator.serviceWorker.register(
+      'pref/intercept_nonexistent_file_sw.js');
+    await waitForState(reg.installing, 'activated');
+
+    let status;
+
+    status = await do_fetch(['dom.serviceWorkers.enabled', true]);
+    is(status, 200, 'SW enabled');
+
+    status = await do_fetch(['dom.serviceWorkers.enabled', false]);
+    is(status, 404, 'SW disabled');
+
+    status = await do_fetch(['dom.serviceWorkers.enabled', true]);
+    is(status, 200, 'SW enabled again');
+
+    await reg.unregister();
+  });
+
+</script>
+<body>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_error_reporting.html b/dom/serviceworkers/test/test_error_reporting.html
new file mode 100644
index 0000000000..7c2d56fb9e
--- /dev/null
+++ b/dom/serviceworkers/test/test_error_reporting.html
@@ -0,0 +1,241 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test Error Reporting of Service Worker Failures</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <script src="utils.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+/**
+ * Test that a bunch of service worker coding errors and failure modes that
+ * might otherwise be hard to diagnose are surfaced as console error messages.
+ * The driving use-case is minimizing cursing from a developer looking at a
+ * document in Firefox testing a page that involves service workers.
+ *
+ * This test assumes that errors will be reported via
+ * ServiceWorkerManager::ReportToAllClients and that that method is reliable and
+ * tested via some other file.
+ **/
+
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["dom.caches.testing.enabled", true],
+  ]});
+});
+
+/**
+ * Ensure an error is logged during the initial registration of a SW when a 404
+ * is received.
+ */
+add_task(async function register_404() {
+  // Start monitoring for the error
+  let expectedMessage = expect_console_message(
+    "ServiceWorkerRegisterNetworkError",
+    [make_absolute_url("network_error/"), "404", make_absolute_url("404.js")]);
+
+  // Register, generating the 404 error.  This will reject with a TypeError
+  // which we need to consume so it doesn't get thrown at our generator.
+  await navigator.serviceWorker.register("404.js", { scope: "network_error/" })
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "TypeError", "404 failed as expected"); });
+
+  await wait_for_expected_message(expectedMessage);
+});
+
+/**
+ * Ensure an error is logged when the service worker is being served with a
+ * MIME type of text/plain rather than a JS type.
+ */
+add_task(async function register_bad_mime_type() {
+  let expectedMessage = expect_console_message(
+    "ServiceWorkerRegisterMimeTypeError2",
+    [make_absolute_url("bad_mime_type/"), "text/plain",
+     make_absolute_url("sw_bad_mime_type.js")]);
+
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.register("sw_bad_mime_type.js", { scope: "bad_mime_type/" })
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "SecurityError", "bad MIME type failed as expected"); });
+
+  await wait_for_expected_message(expectedMessage);
+});
+
+async function notAllowStorageAccess() {
+  throw new Error("Storage permissions should be used when bug 1774860 overhauls this test.");
+}
+
+async function allowStorageAccess() {
+  throw new Error("Storage permissions should be used when bug 1774860 overhauls this test.");
+}
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the content
+ * script is trying to register a service worker.
+ */
+add_task(async function register_storage_error() {
+  let expectedMessage = expect_console_message(
+    "ServiceWorkerRegisterStorageError",
+    [make_absolute_url("storage_not_allow/")]);
+
+  await notAllowStorageAccess();
+
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.register("sw_storage_not_allow.js",
+                                         { scope: "storage_not_allow/" })
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "SecurityError",
+                  "storage access failed as expected."); });
+
+  await wait_for_expected_message(expectedMessage);
+
+  await allowStorageAccess();
+});
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the content
+ * script is trying to get the service worker registration.
+ */
+add_task(async function get_registration_storage_error() {
+  let expectedMessage =
+    expect_console_message("ServiceWorkerGetRegistrationStorageError", []);
+
+  await notAllowStorageAccess();
+
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.getRegistration()
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "SecurityError",
+                  "storage access failed as expected."); });
+
+  await wait_for_expected_message(expectedMessage);
+
+  await allowStorageAccess();
+});
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the content
+ * script is trying to get the service worker registrations.
+ */
+add_task(async function get_registrations_storage_error() {
+  let expectedMessage =
+    expect_console_message("ServiceWorkerGetRegistrationStorageError", []);
+
+  await notAllowStorageAccess();
+
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.getRegistrations()
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "SecurityError",
+                  "storage access failed as expected."); });
+
+  await wait_for_expected_message(expectedMessage);
+
+  await allowStorageAccess();
+});
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the content
+ * script is trying to post a message to the service worker.
+ */
+add_task(async function postMessage_storage_error() {
+  let expectedMessage = expect_console_message(
+    "ServiceWorkerPostMessageStorageError",
+    [make_absolute_url("storage_not_allow/")]);
+
+  let registration;
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.register("sw_storage_not_allow.js",
+                                         { scope: "storage_not_allow/" })
+    .then(reg => { registration = reg; })
+    .then(() => notAllowStorageAccess())
+    .then(() => registration.installing ||
+                registration.waiting ||
+                registration.active)
+    .then(worker =>  worker.postMessage('ha'))
+    .then(
+      () => { ok(false, "should have rejected"); },
+      (e) => { ok(e.name === "SecurityError",
+                  "storage access failed as expected."); });
+
+  await wait_for_expected_message(expectedMessage);
+
+  await registration.unregister();
+  await allowStorageAccess();
+});
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the service
+ * worker is trying to get its client.
+ */
+add_task(async function get_client_storage_error() {
+  let expectedMessage =
+    expect_console_message("ServiceWorkerGetClientStorageError", []);
+
+  await SpecialPowers.pushPrefEnv({"set": [
+    // Make the test pass the IsOriginPotentiallyTrustworthy.
+    ["dom.securecontext.allowlist", "mochi.test"]
+  ]});
+
+  let registration;
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.register("sw_storage_not_allow.js",
+                                         { scope: "test_error_reporting.html" })
+    .then(reg => {
+      registration = reg;
+      return waitForState(registration.installing, "activated");
+    })
+    // Get the client's ID in the stage 1
+    .then(() => fetch("getClient-stage1"))
+    .then(() => notAllowStorageAccess())
+    // Trigger the clients.get() in the stage 2
+    .then(() => fetch("getClient-stage2"))
+    .catch(e => ok(false, "fail due to:" + e));
+
+  await wait_for_expected_message(expectedMessage);
+
+  await registration.unregister();
+  await allowStorageAccess();
+});
+
+/**
+ * Ensure an error is logged when the storage is not allowed and the service
+ * worker is trying to get its clients.
+ */
+add_task(async function get_clients_storage_error() {
+  let expectedMessage =
+    expect_console_message("ServiceWorkerGetClientStorageError", []);
+
+  let registration;
+  // consume the expected rejection so it doesn't get thrown at us.
+  await navigator.serviceWorker.register("sw_storage_not_allow.js",
+                                         { scope: "test_error_reporting.html" })
+    .then(reg => {
+      registration = reg;
+      return waitForState(registration.installing, "activated");
+    })
+    .then(() => notAllowStorageAccess())
+    .then(() => fetch("getClients"))
+    .catch(e => ok(false, "fail due to:" + e));
+
+  await wait_for_expected_message(expectedMessage);
+
+  await registration.unregister();
+  await allowStorageAccess();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_escapedSlashes.html b/dom/serviceworkers/test/test_escapedSlashes.html
new file mode 100644
index 0000000000..001c660242
--- /dev/null
+++ b/dom/serviceworkers/test/test_escapedSlashes.html
@@ -0,0 +1,102 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for escaped slashes in navigator.serviceWorker.register</title>
+  <script type="text/javascript" src="http://mochi.test:8888/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="http://mochi.test:8888/tests/SimpleTest/test.css" />
+  <base href="https://mozilla.org/">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+var tests = [
+  { status:  true,
+    scriptURL: "a.js?foo%2fbar",
+    scopeURL: null },
+  { status:  false,
+    scriptURL: "foo%2fbar",
+    scopeURL: null },
+  { status:  true,
+    scriptURL: "a.js?foo%2Fbar",
+    scopeURL: null },
+  { status:  false,
+    scriptURL: "foo%2Fbar",
+    scopeURL: null },
+  { status:  true,
+    scriptURL: "a.js?foo%5cbar",
+    scopeURL: null },
+  { status:  false,
+    scriptURL: "foo%5cbar",
+    scopeURL: null },
+  { status:  true,
+    scriptURL: "a.js?foo%2Cbar",
+    scopeURL: null },
+  { status:  false,
+    scriptURL: "foo%5Cbar",
+    scopeURL: null },
+  { status:  true,
+    scriptURL: "ok.js",
+    scopeURL: "/scope?foo%2fbar"},
+  { status:  false,
+    scriptURL: "ok.js",
+    scopeURL: "/foo%2fbar"},
+  { status:  true,
+    scriptURL: "ok.js",
+    scopeURL: "/scope?foo%2Fbar"},
+  { status:  false,
+    scriptURL: "ok.js",
+    scopeURL: "foo%2Fbar"},
+  { status:  true,
+    scriptURL: "ok.js",
+    scopeURL: "/scope?foo%5cbar"},
+  { status:  false,
+    scriptURL: "ok.js",
+    scopeURL: "foo%5cbar"},
+  { status:  true,
+    scriptURL: "ok.js",
+    scopeURL: "/scope?foo%5Cbar"},
+  { status:  false,
+    scriptURL: "ok.js",
+    scopeURL: "foo%5Cbar"},
+];
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  navigator.serviceWorker.register(test.scriptURL, test.scopeURL)
+    .then(reg => {
+      ok(false, "Register should fail");
+    }, err => {
+      if (!test.status) {
+        is(err.name, "TypeError", "Registration should fail with TypeError");
+      } else {
+        ok(test.status, "Register should fail");
+      }
+    })
+    .then(runTest);
+}
+
+SimpleTest.waitForExplicitFinish();
+onload = function() {
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["dom.serviceWorkers.enabled", true],
+  ]}, runTest);
+};
+
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_eval_allowed.html b/dom/serviceworkers/test/test_eval_allowed.html
new file mode 100644
index 0000000000..82c6626fd4
--- /dev/null
+++ b/dom/serviceworkers/test/test_eval_allowed.html
@@ -0,0 +1,52 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1160458 - CSP activated by default in Service Workers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  function register() {
+    return navigator.serviceWorker.register("eval_worker.js");
+  }
+
+  function runTest() {
+    try {
+      // eslint-disable-next-line no-eval
+      eval("1");
+      ok(false, "should throw");
+    }
+    catch (ex) {
+      ok(true, "did throw");
+    }
+    register()
+      .then(function(swr) {
+        ok(true, "eval restriction didn't get inherited");
+        swr.unregister()
+          .then(function() {
+            SimpleTest.finish();
+          });
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_eval_allowed.html^headers^ b/dom/serviceworkers/test/test_eval_allowed.html^headers^
new file mode 100644
index 0000000000..51ffaa71dd
--- /dev/null
+++ b/dom/serviceworkers/test/test_eval_allowed.html^headers^
@@ -0,0 +1 @@
+Content-Security-Policy: "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self'"
diff --git a/dom/serviceworkers/test/test_event_listener_leaks.html b/dom/serviceworkers/test/test_event_listener_leaks.html
new file mode 100644
index 0000000000..33ffeb44c4
--- /dev/null
+++ b/dom/serviceworkers/test/test_event_listener_leaks.html
@@ -0,0 +1,63 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1447871 - Test some service worker leak conditions</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="utils.js"></script>
+  <script type="text/javascript" src="/tests/dom/events/test/event_leak_utils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<script class="testbody" type="text/javascript">
+
+const scope = new URL("empty.html?leak_tests", location).href;
+const script = new URL("empty.js", location).href;
+
+// Manipulate service worker DOM objects in the frame's context.
+// Its important here that we create a listener callback from
+// the DOM objects back to the frame's global in order to
+// exercise the leak condition.
+async function useServiceWorker(contentWindow) {
+  contentWindow.navigator.serviceWorker.oncontrollerchange = _ => {
+    contentWindow.controlledChangeCount += 1;
+  };
+  let reg = await contentWindow.navigator.serviceWorker.getRegistration(scope);
+  reg.onupdatefound = _ => {
+    contentWindow.updateCount += 1;
+  };
+  reg.active.onstatechange = _ => {
+    contentWindow.stateChangeCount += 1;
+  };
+}
+
+async function runTest() {
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]});
+
+  let reg = await navigator.serviceWorker.register(script, { scope });
+  await waitForState(reg.installing, "activated");
+
+  try {
+    await checkForEventListenerLeaks("ServiceWorker", useServiceWorker);
+  } catch (e) {
+    ok(false, e);
+  } finally {
+    await reg.unregister();
+    SimpleTest.finish();
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+addEventListener("load", runTest, { once: true });
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_eventsource_intercept.html b/dom/serviceworkers/test/test_eventsource_intercept.html
new file mode 100644
index 0000000000..b49f557792
--- /dev/null
+++ b/dom/serviceworkers/test/test_eventsource_intercept.html
@@ -0,0 +1,102 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182103 - Test EventSource scenarios with fetch interception</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function testFrame(src) {
+    return new Promise(function(resolve, reject) {
+      var iframe = document.createElement("iframe");
+      iframe.src = src;
+      window.onmessage = function(e) {
+        if (e.data.status == "callback") {
+          switch(e.data.data) {
+            case "ok":
+              ok(e.data.condition, e.data.message);
+              break;
+            case "ready":
+              iframe.contentWindow.postMessage({status: "callback", data: "eventsource"}, "*");
+              break;
+            case "done":
+              window.onmessage = null;
+              iframe.src = "about:blank";
+              document.body.removeChild(iframe);
+              iframe = null;
+              resolve();
+              break;
+            default:
+              ok(false, "Something went wrong");
+              break;
+          }
+        } else {
+          ok(false, "Something went wrong");
+        }
+      };
+      document.body.appendChild(iframe);
+    });
+  }
+
+  function runTest() {
+      Promise.resolve()
+        .then(() => {
+        info("Going to intercept and test opaque responses");
+        return testFrame("eventsource/eventsource_register_worker.html" +
+                         "?script=eventsource_opaque_response_intercept_worker.js");
+      })
+      .then(() => {
+        return testFrame("eventsource/eventsource_opaque_response.html");
+      })
+      .then(() => {
+        info("Going to intercept and test cors responses");
+        return testFrame("eventsource/eventsource_register_worker.html" +
+                         "?script=eventsource_cors_response_intercept_worker.js");
+      })
+      .then(() => {
+        return testFrame("eventsource/eventsource_cors_response.html");
+      })
+      .then(() => {
+        info("Going to intercept and test synthetic responses");
+        return testFrame("eventsource/eventsource_register_worker.html" +
+                         "?script=eventsource_synthetic_response_intercept_worker.js");
+      })
+      .then(() => {
+        return testFrame("eventsource/eventsource_synthetic_response.html");
+      })
+      .then(() => {
+        info("Going to intercept and test mixed content cors responses");
+        return testFrame("https://example.com/tests/dom/serviceworkers/test/" +
+                         "eventsource/eventsource_register_worker.html" +
+                         "?script=eventsource_mixed_content_cors_response_intercept_worker.js");
+      })
+      .then(() => {
+        return testFrame("https://example.com/tests/dom/serviceworkers/test/" +
+                         "eventsource/eventsource_mixed_content_cors_response.html");
+      })
+      .then(SimpleTest.finish)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_fetch_event.html b/dom/serviceworkers/test/test_fetch_event.html
new file mode 100644
index 0000000000..5227f6ae34
--- /dev/null
+++ b/dom/serviceworkers/test/test_fetch_event.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 94048 - test install event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  SimpleTest.requestCompleteLog();
+
+  var registration;
+  function simpleRegister() {
+    return navigator.serviceWorker.register("fetch_event_worker.js", { scope: "./fetch" })
+      .then(swr => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated');
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(success) {
+      ok(success, "Service worker should be unregistered successfully");
+    }, function(e) {
+      dump("SW unregistration error: " + e + "\n");
+    });
+  }
+
+  function testController() {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data.status == "ok") {
+          ok(e.data.result, e.data.message);
+        } else if (e.data.status == "done") {
+          window.onmessage = null;
+          w.close();
+          resolve();
+        }
+      }
+    });
+
+    var w = window.open("fetch/index.html");
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(testController)
+      .then(unregister)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_fetch_event_with_thirdpartypref.html b/dom/serviceworkers/test/test_fetch_event_with_thirdpartypref.html
new file mode 100644
index 0000000000..53552e03c3
--- /dev/null
+++ b/dom/serviceworkers/test/test_fetch_event_with_thirdpartypref.html
@@ -0,0 +1,90 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 94048 - test install event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+
+  // NOTE: This is just test_fetch_event.html but with an alternate cookie
+  //       mode preference set to make sure that setting the preference does
+  //       not break interception as observed in bug 1336364.
+  // TODO: Refactor this test so it doesn't duplicate so much code logic.
+
+  SimpleTest.requestCompleteLog();
+
+  var registration;
+  function simpleRegister() {
+    return navigator.serviceWorker.register("fetch_event_worker.js", { scope: "./fetch" })
+      .then(swr => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated');
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(success) {
+      ok(success, "Service worker should be unregistered successfully");
+    }, function(e) {
+      dump("SW unregistration error: " + e + "\n");
+    });
+  }
+
+  function testController() {
+    var p = new Promise(function(resolve, reject) {
+      var reloaded = false;
+      window.onmessage = function(e) {
+        if (e.data.status == "ok") {
+          ok(e.data.result, e.data.message);
+        } else if (e.data.status == "done") {
+          if (reloaded) {
+            window.onmessage = null;
+            w.close();
+            resolve();
+          } else {
+            w.location.reload();
+            reloaded = true;
+          }
+        }
+      }
+    });
+
+    var w = window.open("fetch/index.html");
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(testController)
+      .then(unregister)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  const COOKIE_BEHAVIOR_REJECTFOREIGN = 1;
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["network.cookie.cookieBehavior", COOKIE_BEHAVIOR_REJECTFOREIGN],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_fetch_integrity.html b/dom/serviceworkers/test/test_fetch_integrity.html
new file mode 100644
index 0000000000..35879d5749
--- /dev/null
+++ b/dom/serviceworkers/test/test_fetch_integrity.html
@@ -0,0 +1,228 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title> Test fetch.integrity on console report for serviceWorker and sharedWorker </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<body>
+<div id="content" style="display: none"></div>
+<script src="utils.js"></script>
+<script type="text/javascript">
+"use strict";
+
+let security_localizer =
+  stringBundleService.createBundle("chrome://global/locale/security/security.properties");
+
+let consoleScript;
+let monitorCallbacks = [];
+
+function registerConsoleMonitor() {
+  return new Promise(resolve => {
+    var url = SimpleTest.getTestFileURL("console_monitor.js");
+    consoleScript = SpecialPowers.loadChromeScript(url);
+
+    consoleScript.addMessageListener("ready", resolve);
+    consoleScript.addMessageListener("monitor", function(msg) {
+      for (let i = 0; i < monitorCallbacks.length;) {
+         if (monitorCallbacks[i](msg)) {
+           ++i;
+         } else {
+           monitorCallbacks.splice(i, 1);
+         }
+      }
+    });
+    consoleScript.sendAsyncMessage("load", {});
+  });
+}
+
+function unregisterConsoleMonitor() {
+  return new Promise(resolve => {
+    consoleScript.addMessageListener("unloaded", () => {
+      consoleScript.destroy();
+      resolve();
+    });
+    consoleScript.sendAsyncMessage("unload", {});
+  });
+}
+
+function registerConsoleMonitorCallback(callback) {
+  monitorCallbacks.push(callback);
+}
+
+function waitForMessages() {
+  let messages = [];
+
+  // process repeated paired arguments of: msgId, args
+  for (let i = 0; i < arguments.length; i += 3) {
+    let msgId = arguments[i];
+    let args = arguments[i + 1];
+    messages.push(security_localizer.formatStringFromName(msgId, args));
+  }
+
+  return new Promise(resolve => {
+    registerConsoleMonitorCallback(msg => {
+      for (let i = 0; i < messages.length; ++i) {
+        if (messages[i] == msg.errorMessage) {
+          messages.splice(i, 1);
+          break;
+        }
+      }
+
+      if (!messages.length) {
+        resolve();
+        return false;
+      }
+
+      return true;
+    });
+  });
+}
+
+function expect_security_console_message(/* msgId, args, ... */) {
+  let expectations = [];
+  // process repeated paired arguments of: msgId, args
+  for (let i = 0; i < arguments.length; i += 3) {
+    let msgId = arguments[i];
+    let args = arguments[i + 1];
+    let filename = arguments[i + 2];
+    expectations.push({
+      errorMessage: security_localizer.formatStringFromName(msgId, args),
+      sourceName: filename,
+    });
+  }
+  return new Promise(resolve => {
+    SimpleTest.monitorConsole(resolve, expectations);
+  });
+}
+
+// (This doesn't really need to be its own task, but it allows the actual test
+// case to be self-contained.)
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["browser.newtab.preload", false],
+  ]});
+});
+
+add_task(async function test_integrity_serviceWorker() {
+  var filename = make_absolute_url("fetch.js");
+  var filename2 = make_absolute_url("fake.html");
+
+  let registration = await navigator.serviceWorker.register("fetch.js",
+                                                            { scope: "./" });
+  await waitForState(registration.installing, "activated");
+
+  info("Test for mNavigationInterceptions.")
+  // The client_win will reload to another URL after opening filename2.
+  let client_win = window.open(filename2);
+
+  let expectedMessage = expect_security_console_message(
+    "MalformedIntegrityHash",
+    ["abc"],
+    filename,
+    "NoValidMetadata",
+    [""],
+    filename,
+  );
+  let expectedMessage2 = expect_security_console_message(
+    "MalformedIntegrityHash",
+    ["abc"],
+    filename,
+    "NoValidMetadata",
+    [""],
+    filename,
+  );
+
+  info("Test for mControlledDocuments and report error message to console.");
+  // The fetch will succeed because the integrity value is invalid and we are
+  // looking for the console message regarding the bad integrity value.
+  await fetch("fail.html");
+
+  await wait_for_expected_message(expectedMessage);
+
+  await wait_for_expected_message(expectedMessage2);
+
+  await registration.unregister();
+  client_win.close();
+});
+
+add_task(async function test_integrity_sharedWorker() {
+  var filename = make_absolute_url("sharedWorker_fetch.js");
+
+  await registerConsoleMonitor();
+
+  info("Attach main window to a SharedWorker.");
+  let sharedWorker = new SharedWorker(filename);
+  let waitForConnected = new Promise((resolve) => {
+    sharedWorker.port.onmessage = function (e) {
+      if (e.data == "Connected") {
+        resolve();
+      } else {
+        reject();
+      }
+    }
+  });
+  await waitForConnected;
+
+  info("Attch another window to the same SharedWorker.");
+  // Open another window and its also managed by the shared worker.
+  let client_win = window.open("create_another_sharedWorker.html");
+  let waitForBothConnected = new Promise((resolve) => {
+    sharedWorker.port.onmessage = function (e) {
+      if (e.data == "BothConnected") {
+        resolve();
+      } else {
+        reject();
+      }
+    }
+  });
+  await waitForBothConnected;
+
+  let expectedMessage = waitForMessages(
+    "MalformedIntegrityHash",
+    ["abc"],
+    filename,
+    "NoValidMetadata",
+    [""],
+    filename,
+  );
+
+  let expectedMessage2 = waitForMessages(
+    "MalformedIntegrityHash",
+    ["abc"],
+    filename,
+    "NoValidMetadata",
+    [""],
+    filename,
+  );
+
+  info("Start to fetch a URL with wrong integrity.")
+  sharedWorker.port.start();
+  sharedWorker.port.postMessage("StartFetchWithWrongIntegrity");
+
+  let waitForSRIFailed = new Promise((resolve) => {
+    sharedWorker.port.onmessage = function (e) {
+      if (e.data == "SRI_failed") {
+        resolve();
+      } else {
+        reject();
+      }
+    }
+  });
+  await waitForSRIFailed;
+
+  await expectedMessage;
+  await expectedMessage2;
+
+  client_win.close();
+
+  await unregisterConsoleMonitor();
+});
+
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_file_blob_response.html b/dom/serviceworkers/test/test_file_blob_response.html
new file mode 100644
index 0000000000..3aa72c3dda
--- /dev/null
+++ b/dom/serviceworkers/test/test_file_blob_response.html
@@ -0,0 +1,78 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1253777 - Test interception using file blob response body</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var scope = './file_blob_response/';
+  function start() {
+    return navigator.serviceWorker.register("file_blob_response_worker.js",
+                                            { scope })
+      .then(function(swr) {
+        registration = swr;
+        return new waitForState(swr.installing, 'activated');
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      ok(false, "Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function withFrame(url) {
+    return new Promise(function(resolve, reject) {
+      var content = document.getElementById("content");
+      ok(content, "Parent exists.");
+
+      var frame = document.createElement("iframe");
+      frame.setAttribute('src', url);
+      content.appendChild(frame);
+
+      frame.addEventListener('load', function(evt) {
+        resolve(frame);
+      }, {once: true});
+    });
+  }
+
+  function runTest() {
+    start()
+      .then(function() {
+        return withFrame(scope + 'dummy.txt');
+      })
+      .then(function(frame) {
+        var result = JSON.parse(frame.contentWindow.document.body.textContent);
+        frame.remove();
+        is(result.value, 'success');
+      })
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      })
+      .then(unregister)
+      .then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_file_blob_upload.html b/dom/serviceworkers/test/test_file_blob_upload.html
new file mode 100644
index 0000000000..e60e65badd
--- /dev/null
+++ b/dom/serviceworkers/test/test_file_blob_upload.html
@@ -0,0 +1,146 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1203680 - Test interception of file blob uploads</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var iframe;
+  function start() {
+    return navigator.serviceWorker.register("empty.js",
+                                            { scope: "./sw_clients/" })
+      .then((swr) => {
+        registration = swr
+        return waitForState(swr.installing, 'activated', swr);
+      });
+  }
+
+  function unregister() {
+    if (iframe) {
+      iframe.remove();
+      iframe = null;
+    }
+
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      ok(false, "Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function withFrame() {
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/file_blob_upload_frame.html");
+    content.appendChild(iframe);
+
+    return new Promise(function(resolve, reject) {
+      window.addEventListener('message', function(evt) {
+        if (evt.data.status === 'READY') {
+          resolve();
+        } else {
+          reject(evt.data.result);
+        }
+      }, {once: true});
+    });
+  }
+
+  function postBlob(body) {
+    return new Promise(function(resolve, reject) {
+      window.addEventListener('message', function(evt) {
+        if (evt.data.status === 'OK') {
+          is(JSON.stringify(body), JSON.stringify(evt.data.result),
+             'body echoed back correctly');
+          resolve();
+        } else {
+          reject(evt.data.result);
+        }
+      }, {once: true});
+
+      iframe.contentWindow.postMessage({ type: 'TEST', body }, '*');
+    });
+  }
+
+  function generateMessage(length) {
+
+    var lorem =
+      'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis egestas '
+      'vehicula tortor eget ultrices. Sed et luctus est. Nunc eu orci ligula. '
+      'In vel ornare eros, eget lacinia diam. Praesent vel metus mattis, '
+      'cursus nulla sit amet, rhoncus diam. Aliquam nulla tortor, aliquet et '
+      'viverra non, dignissim vel tellus. Praesent sed ex in dolor aliquet '
+      'aliquet. In at facilisis sem, et aliquet eros. Maecenas feugiat nisl '
+      'quis elit blandit posuere. Duis viverra odio sed eros consectetur, '
+      'viverra mattis ligula volutpat.';
+
+    var result = '';
+
+    while (result.length < length) {
+      var remaining = length - result.length;
+      if (remaining < lorem.length) {
+        result += lorem.slice(0, remaining);
+      } else {
+        result += lorem;
+      }
+    }
+
+    return result;
+  }
+
+  var smallBody = generateMessage(64);
+  var mediumBody = generateMessage(1024);
+
+  // TODO: Test large bodies over the default pipe size.  Currently stalls
+  //       due to bug 1134372.
+  //var largeBody = generateMessage(100 * 1024);
+
+  function runTest() {
+    start()
+      .then(withFrame)
+      .then(function() {
+        return postBlob({ hops: 0, message: smallBody });
+      })
+      .then(function() {
+        return postBlob({ hops: 1, message: smallBody });
+      })
+      .then(function() {
+        return postBlob({ hops: 10, message: smallBody });
+      })
+      .then(function() {
+        return postBlob({ hops: 0, message: mediumBody });
+      })
+      .then(function() {
+        return postBlob({ hops: 1, message: mediumBody });
+      })
+      .then(function() {
+        return postBlob({ hops: 10, message: mediumBody });
+      })
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_file_upload.html b/dom/serviceworkers/test/test_file_upload.html
new file mode 100644
index 0000000000..0c502686af
--- /dev/null
+++ b/dom/serviceworkers/test/test_file_upload.html
@@ -0,0 +1,68 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1424701 - Test for service worker + file upload</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="utils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<input id="input" type="file">
+<script class="testbody" type="text/javascript">
+
+function GetFormData(file) {
+  const formData = new FormData();
+  formData.append('file', file);
+  return formData;
+}
+
+async function onOpened(message) {
+  let input = document.getElementById("input");
+  SpecialPowers.wrap(input).mozSetFileArray([message.file]);
+  script.destroy();
+
+  let reg = await navigator.serviceWorker.register('sw_file_upload.js',
+                                                   {scope: "." });
+  let serviceWorker = reg.installing || reg.waiting || reg.active;
+  await waitForState(serviceWorker, 'activated');
+
+  let res = await fetch('server_file_upload.sjs?clone=0', {
+    method: 'POST',
+    body: input.files[0],
+  });
+
+  let data = await res.clone().text();
+  ok(data.length, "We have data for an uncloned request!");
+
+  res = await fetch('server_file_upload.sjs?clone=1', {
+    method: 'POST',
+    // Make sure the underlying stream is a file stream
+    body: GetFormData(input.files[0]),
+  });
+
+  data = await res.clone().text();
+  ok(data.length, "We have data for a file-stream-backed cloned request!");
+
+  await reg.unregister();
+  SimpleTest.finish();
+}
+
+let url = SimpleTest.getTestFileURL("script_file_upload.js");
+let script = SpecialPowers.loadChromeScript(url);
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [
+  ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+  ["dom.serviceWorkers.enabled", true],
+  ["dom.serviceWorkers.testing.enabled", true]
+]}).then(() => {
+  script.addMessageListener("file.opened", onOpened);
+  script.sendAsyncMessage("file.open");
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_force_refresh.html b/dom/serviceworkers/test/test_force_refresh.html
new file mode 100644
index 0000000000..85332d3ecc
--- /dev/null
+++ b/dom/serviceworkers/test/test_force_refresh.html
@@ -0,0 +1,104 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test service worker post message </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  /**
+   *
+   */
+  let iframe;
+  let registration;
+
+  function start() {
+    return new Promise(resolve => {
+      const content = document.getElementById("content");
+      ok(content, "Parent exists.");
+
+      iframe = document.createElement("iframe");
+      iframe.setAttribute("src", "sw_clients/refresher_compressed.html");
+
+      /*
+       * The initial iframe must be the _uncached_ version, which means its
+       * load must happen before the Service Worker's `activate` event.
+       * Rather than `waitUntil`-ing the Service Worker's `install` event
+       * until the load finishes (more concurrency, but involves coordinating
+       * `postMessage`s), just ensure the load finishes before registering
+       * the Service Worker (which is simpler).
+       */
+      iframe.onload = resolve;
+
+      content.appendChild(iframe);
+    }).then(async () => {
+      /*
+       * There's no need _here_ to explicitly wait for this Service Worker to be
+       * "activated"; this test will progress when the "READY"/"READY_CACHED"
+       * messages are received from the iframe, and the iframe will only send
+       * those messages once the Service Worker is "activated" (by chaining on
+       * its `navigator.serviceWorker.ready` promise).
+       */
+      registration = await navigator.serviceWorker.register(
+        "force_refresh_worker.js", { scope: "./sw_clients/" });
+    });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function testForceRefresh(swr) {
+    return new Promise(function(res, rej) {
+      var count = 0;
+      var cachedCount = 0;
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          count += 1;
+          if (count == 2) {
+            is(cachedCount, 1, "should have received cached message before " +
+                               "second non-cached message");
+            res();
+          }
+          iframe.contentWindow.postMessage("REFRESH", "*");
+        } else if (e.data === "READY_CACHED") {
+          cachedCount += 1;
+          is(count, 1, "should have received non-cached message before " +
+                       "cached message");
+          iframe.contentWindow.postMessage("FORCE_REFRESH", "*");
+        }
+      }
+    }).then(() => document.getElementById("content").removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testForceRefresh)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_gzip_redirect.html b/dom/serviceworkers/test/test_gzip_redirect.html
new file mode 100644
index 0000000000..8119303ae7
--- /dev/null
+++ b/dom/serviceworkers/test/test_gzip_redirect.html
@@ -0,0 +1,88 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test service worker post message </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  function start() {
+    return navigator.serviceWorker.register("gzip_redirect_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then((swr) => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated', swr);
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testGzipRedirect(swr) {
+    var p = new Promise(function(res, rej) {
+      var navigatorReady = false;
+      var finalReady = false;
+
+      window.onmessage = function(e) {
+        if (e.data === "NAVIGATOR_READY") {
+          ok(!navigatorReady, "should only get navigator ready message once");
+          ok(!finalReady, "should get navigator ready before final redirect ready message");
+          navigatorReady = true;
+          iframe.contentWindow.postMessage({
+            type: "NAVIGATE",
+            url: "does_not_exist.html"
+          }, "*");
+        } else if (e.data === "READY") {
+          ok(navigatorReady, "should only get navigator ready message once");
+          ok(!finalReady, "should get final ready message only once");
+          finalReady = true;
+          res();
+        }
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/navigator.html");
+    content.appendChild(iframe);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testGzipRedirect)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_hsts_upgrade_intercept.html b/dom/serviceworkers/test/test_hsts_upgrade_intercept.html
new file mode 100644
index 0000000000..59fef0ec14
--- /dev/null
+++ b/dom/serviceworkers/test/test_hsts_upgrade_intercept.html
@@ -0,0 +1,66 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that an HSTS upgraded request can be intercepted by a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  var framesLoaded = 0;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/hsts/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "http://example.com/tests/dom/serviceworkers/test/fetch/hsts/index.html";
+      } else if (e.data.status == "protocol") {
+        is(e.data.data, "https:", "Correct protocol expected");
+        ok(e.data.securityInfoPresent, "Security info present on intercepted value");
+        switch (++framesLoaded) {
+        case 1:
+          iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/hsts/embedder.html";
+          break;
+        case 2:
+          iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/hsts/image.html";
+          break;
+        }
+      } else if (e.data.status == "image") {
+        is(e.data.data, 40, "The image request was upgraded before interception");
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/hsts/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        SpecialPowers.cleanUpSTSData("http://example.com");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      // This is needed so that we can test upgrading a non-secure load inside an https iframe.
+      ["security.mixed_content.block_active_content", false],
+      ["security.mixed_content.block_display_content", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_https_fetch.html b/dom/serviceworkers/test/test_https_fetch.html
new file mode 100644
index 0000000000..801d0c8a3a
--- /dev/null
+++ b/dom/serviceworkers/test/test_https_fetch.html
@@ -0,0 +1,61 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1133763 - test fetch event in HTTPS origins</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/register.html";
+    var ios;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        ios = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]
+                           .getService(SpecialPowers.Ci.nsIIOService);
+        ios.offline = true;
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/index.html";
+      } else if (e.data.status == "done") {
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/synth-sw.html";
+      } else if (e.data.status == "done-synth-sw") {
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/synth-window.html";
+      } else if (e.data.status == "done-synth-window") {
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/synth.html";
+      } else if (e.data.status == "done-synth") {
+        ios.offline = false;
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_https_fetch_cloned_response.html b/dom/serviceworkers/test/test_https_fetch_cloned_response.html
new file mode 100644
index 0000000000..19066297c5
--- /dev/null
+++ b/dom/serviceworkers/test/test_https_fetch_cloned_response.html
@@ -0,0 +1,55 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1133763 - test fetch event in HTTPS origins with a cloned response</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/clonedresponse/register.html";
+    var ios;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        ios = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]
+                           .getService(SpecialPowers.Ci.nsIIOService);
+        ios.offline = true;
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/clonedresponse/index.html";
+      } else if (e.data.status == "done") {
+        ios.offline = false;
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/clonedresponse/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_https_origin_after_redirect.html b/dom/serviceworkers/test/test_https_origin_after_redirect.html
new file mode 100644
index 0000000000..f0871950d8
--- /dev/null
+++ b/dom/serviceworkers/test/test_https_origin_after_redirect.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/index-https.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "https://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_https_origin_after_redirect_cached.html b/dom/serviceworkers/test/test_https_origin_after_redirect_cached.html
new file mode 100644
index 0000000000..fa580a8109
--- /dev/null
+++ b/dom/serviceworkers/test/test_https_origin_after_redirect_cached.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/index-cached-https.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "https://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/origin/https/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_https_synth_fetch_from_cached_sw.html b/dom/serviceworkers/test/test_https_synth_fetch_from_cached_sw.html
new file mode 100644
index 0000000000..444ef356dd
--- /dev/null
+++ b/dom/serviceworkers/test/test_https_synth_fetch_from_cached_sw.html
@@ -0,0 +1,68 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1156847 - test fetch event generating a synthesized response in HTTPS origins from a cached SW</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" tyle="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/register.html";
+    var ios;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        ios = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]
+                           .getService(SpecialPowers.Ci.nsIIOService);
+        ios.offline = true;
+
+        // In order to load synth.html from a cached service worker, we first
+        // remove the existing window that is keeping the service worker alive,
+        // and do a GC to ensure that the SW is destroyed.  This way, when we
+        // load synth.html for the second time, we will first recreate the
+        // service worker from the cache.  This is intended to test that we
+        // properly store and retrieve the security info from the cache.
+        iframe.remove();
+        iframe = null;
+        SpecialPowers.exactGC(function() {
+          iframe = document.createElement("iframe");
+          iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/synth.html";
+          document.body.appendChild(iframe);
+        });
+      } else if (e.data.status == "done-synth") {
+        ios.offline = false;
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/https/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_imagecache.html b/dom/serviceworkers/test/test_imagecache.html
new file mode 100644
index 0000000000..52a793bfb9
--- /dev/null
+++ b/dom/serviceworkers/test/test_imagecache.html
@@ -0,0 +1,55 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1202085 - Test that images from different controllers don't cached together</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache/index.html";
+      } else if (e.data.status == "result") {
+        is(e.data.url, "image-40px.png", "Correct url expected");
+        is(e.data.width, 40, "Correct width expected");
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache/postmortem.html";
+      } else if (e.data.status == "postmortem") {
+        is(e.data.width, 20, "Correct width expected");
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_imagecache_max_age.html b/dom/serviceworkers/test/test_imagecache_max_age.html
new file mode 100644
index 0000000000..fcb8d3e306
--- /dev/null
+++ b/dom/serviceworkers/test/test_imagecache_max_age.html
@@ -0,0 +1,71 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that the image cache respects a synthesized image's Cache headers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  var framesLoaded = 0;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache-maxage/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache-maxage/index.html";
+      } else if (e.data.status == "result") {
+        switch (++framesLoaded) {
+        case 1:
+          is(e.data.url, "image-20px.png", "Correct url expected");
+          is(e.data.url2, "image-20px.png", "Correct url expected");
+          is(e.data.width, 20, "Correct width expected");
+          is(e.data.width2, 20, "Correct width expected");
+          // Wait for 100ms so that the image gets expired.
+          setTimeout(function() {
+            iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache-maxage/index.html?new"
+          }, 100);
+          break;
+        case 2:
+          is(e.data.url, "image-40px.png", "Correct url expected");
+          is(e.data.url2, "image-40px.png", "Correct url expected");
+          is(e.data.width, 40, "Correct width expected");
+          is(e.data.width2, 40, "Correct width expected");
+          iframe.src = "/tests/dom/serviceworkers/test/fetch/imagecache-maxage/unregister.html";
+          break;
+        default:
+          ok(false, "This should never happen");
+        }
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.requestFlakyTimeout("This test needs to simulate the passing of time");
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_importscript.html b/dom/serviceworkers/test/test_importscript.html
new file mode 100644
index 0000000000..c0a894cf3c
--- /dev/null
+++ b/dom/serviceworkers/test/test_importscript.html
@@ -0,0 +1,74 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test service worker - script cache policy</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<div id="content"></div>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  function start() {
+    return navigator.serviceWorker.register("importscript_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then(swr => waitForState(swr.installing, 'activated', swr))
+      .then(swr => registration = swr);
+  }
+
+  function unregister() {
+    return fetch("importscript.sjs?clearcounter").then(function() {
+      return registration.unregister();
+    }).then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function testPostMessage(swr) {
+    var p = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          swr.active.postMessage("do magic");
+          return;
+        }
+
+        ok(e.data === "OK", "Worker posted the correct value: " + e.data);
+        res();
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/service_worker_controlled.html");
+    content.appendChild(iframe);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testPostMessage)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_importscript_mixedcontent.html b/dom/serviceworkers/test/test_importscript_mixedcontent.html
new file mode 100644
index 0000000000..15fe5e88b6
--- /dev/null
+++ b/dom/serviceworkers/test/test_importscript_mixedcontent.html
@@ -0,0 +1,53 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1198078 - test that we respect mixed content blocking in importScript() inside service workers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/importscript-mixedcontent/register.html";
+    var ios;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/importscript-mixedcontent/index.html";
+      } else if (e.data.status == "done") {
+        is(e.data.data, "good", "Mixed content blocking should work correctly for service workers");
+        iframe.src = "https://example.com/tests/dom/serviceworkers/test/fetch/importscript-mixedcontent/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["security.mixed_content.block_active_content", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_install_event.html b/dom/serviceworkers/test/test_install_event.html
new file mode 100644
index 0000000000..87f89725dc
--- /dev/null
+++ b/dom/serviceworkers/test/test_install_event.html
@@ -0,0 +1,143 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 94048 - test install event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    var p = navigator.serviceWorker.register("worker.js", { scope: "./install_event" });
+    return p;
+  }
+
+  function nextRegister(reg) {
+    ok(reg instanceof ServiceWorkerRegistration, "reg should be a ServiceWorkerRegistration");
+    var p = navigator.serviceWorker.register("install_event_worker.js", { scope: "./install_event" });
+    return p.then(function(swr) {
+      ok(reg === swr, "register should resolve to the same registration object");
+      var update_found_promise = new Promise(function(resolve, reject) {
+        swr.addEventListener('updatefound', function(e) {
+          ok(true, "Received onupdatefound");
+          resolve();
+        });
+      });
+
+      var worker_activating = new Promise(function(res, reject) {
+        ok(swr.installing instanceof ServiceWorker, "There should be an installing worker if promise resolves.");
+        ok(swr.installing.state == "installing", "Installing worker's state should be 'installing'");
+        swr.installing.onstatechange = function(e) {
+          if (e.target.state == "activating") {
+            e.target.onstatechange = null;
+            res();
+          }
+        }
+      });
+
+      return Promise.all([update_found_promise, worker_activating]);
+    }, function(e) {
+      ok(false, "Unexpected Error in nextRegister! " + e);
+    });
+  }
+
+  function installError() {
+    // Silence worker errors so they don't cause the test to fail.
+    window.onerror = function(e) {}
+    return navigator.serviceWorker.register("install_event_error_worker.js", { scope: "./install_event" })
+      .then(function(swr) {
+        ok(swr.installing instanceof ServiceWorker, "There should be an installing worker if promise resolves.");
+        ok(swr.installing.state == "installing", "Installing worker's state should be 'installing'");
+        return new Promise(function(resolve, reject) {
+          swr.installing.onstatechange = function(e) {
+            ok(e.target.state == "redundant", "Installation of worker with error should fail.");
+            resolve();
+          }
+        });
+      }).then(function() {
+        return navigator.serviceWorker.getRegistration("./install_event").then(function(swr) {
+          var newest = swr.waiting || swr.active;
+          ok(newest, "Waiting or active worker should still exist");
+          ok(newest.scriptURL.match(/install_event_worker.js$/), "Previous worker should remain the newest worker");
+        });
+      });
+  }
+
+  function testActive(worker) {
+    is(worker.state, "activating", "Should be activating");
+    return new Promise(function(resolve, reject) {
+      worker.onstatechange = function(e) {
+        e.target.onstatechange = null;
+        is(e.target.state, "activated", "Activation of worker with error in activate event handler should still succeed.");
+        resolve();
+      }
+    });
+  }
+
+  function activateErrorShouldSucceed() {
+    // Silence worker errors so they don't cause the test to fail.
+    window.onerror = function() { }
+    return navigator.serviceWorker.register("activate_event_error_worker.js", { scope: "./activate_error" })
+      .then(function(swr) {
+        var p = new Promise(function(resolve, reject) {
+          ok(swr.installing.state == "installing", "activateErrorShouldSucceed(): Installing worker's state should be 'installing'");
+          swr.installing.onstatechange = function(e) {
+            e.target.onstatechange = null;
+            if (swr.waiting) {
+              swr.waiting.onstatechange = function(event) {
+                event.target.onstatechange = null;
+                testActive(swr.active).then(resolve, reject);
+              }
+            } else {
+              testActive(swr.active).then(resolve, reject);
+            }
+          }
+        });
+
+        return p.then(function() {
+          return Promise.resolve(swr);
+        });
+      }).then(function(swr) {
+        return swr.unregister();
+      });
+  }
+
+  function unregister() {
+    return navigator.serviceWorker.getRegistration("./install_event").then(function(reg) {
+      return reg.unregister();
+    });
+  }
+
+  function runTest() {
+    Promise.resolve()
+      .then(simpleRegister)
+      .then(nextRegister)
+      .then(installError)
+      .then(activateErrorShouldSucceed)
+      .then(unregister)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_install_event_gc.html b/dom/serviceworkers/test/test_install_event_gc.html
new file mode 100644
index 0000000000..eadab685f2
--- /dev/null
+++ b/dom/serviceworkers/test/test_install_event_gc.html
@@ -0,0 +1,120 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test install event being GC'd before waitUntil fulfills</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+var script = 'blocking_install_event_worker.js';
+var scope = 'sw_clients/simple.html?install-event-gc';
+var registration;
+
+function register() {
+  return navigator.serviceWorker.register(script, { scope })
+    .then(swr => registration = swr);
+}
+
+function unregister() {
+  if (!registration) {
+    return undefined;
+  }
+  return registration.unregister();
+}
+
+function waitForInstallEvent() {
+  return new Promise((resolve, reject) => {
+    navigator.serviceWorker.addEventListener('message', evt => {
+      if (evt.data.type === 'INSTALL_EVENT') {
+        resolve();
+      }
+    });
+  });
+}
+
+function gcWorker() {
+  return new Promise(function(resolve, reject) {
+    // We are able to trigger asynchronous garbage collection and cycle
+    // collection by emitting "child-cc-request" and "child-gc-request"
+    // observer notifications.  The worker RuntimeService will translate
+    // these notifications into the appropriate operation on all known
+    // worker threads.
+    //
+    // In the failure case where GC/CC causes us to abort the installation,
+    // we will know something happened from the statechange event.
+    const statechangeHandler = evt => {
+      // Reject rather than resolving to avoid the possibility of us seeing
+      // an unrelated racing statechange somehow.  Since in the success case we
+      // will still see a state change on termination, we do explicitly need to
+      // be removed on the success path.
+      ok(registration.installing, 'service worker is still installing?');
+      reject();
+    };
+    registration.installing.addEventListener('statechange', statechangeHandler);
+    // In the success case since the service worker installation is effectively
+    // hung, we instead depend on sending a 'ping' message to the service worker
+    // and hearing it 'pong' back.  Since we issue our postMessage after we
+    // trigger the GC/CC, our 'ping' will only be processed after the GC/CC and
+    // therefore the pong will also strictly occur after the cycle collection.
+    navigator.serviceWorker.addEventListener('message', evt => {
+      if (evt.data.type === 'pong') {
+        registration.installing.removeEventListener(
+          'statechange', statechangeHandler);
+        resolve();
+      }
+    });
+    // At the current time, the service worker will exist in our same process
+    // and notifyObservers is synchronous.  However, in the future, service
+    // workers may end up in a separate process and in that case it will be
+    // appropriate to use notifyObserversInParentProcess or something like it.
+    // (notifyObserversInParentProcess is a synchronous IPC call to the parent
+    // process's main thread.  IPDL PContent::CycleCollect is an async message.
+    // Ordering will be maintained if the postMessage goes via PContent as well,
+    // but that seems unlikely.)
+    SpecialPowers.notifyObservers(null, 'child-gc-request');
+    SpecialPowers.notifyObservers(null, 'child-cc-request');
+    SpecialPowers.notifyObservers(null, 'child-gc-request');
+    // (Only send the ping after we set the gc/cc/gc in motion.)
+    registration.installing.postMessage({ type: 'ping' });
+  });
+}
+
+function terminateWorker() {
+  return SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.idle_timeout", 0],
+      ["dom.serviceWorkers.idle_extended_timeout", 0]
+    ]
+  }).then(_ => {
+    registration.installing.postMessage({ type: 'RESET_TIMER' });
+  });
+}
+
+function runTest() {
+  Promise.all([
+    waitForInstallEvent(),
+    register()
+  ]).then(_ => ok(registration.installing, 'service worker is installing'))
+    .then(gcWorker)
+    .then(_ => ok(registration.installing, 'service worker is still installing'))
+    .then(terminateWorker)
+    .catch(e => ok(false, e))
+    .then(unregister)
+    .then(SimpleTest.finish);
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [
+  ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+  ["dom.serviceWorkers.enabled", true],
+  ["dom.serviceWorkers.testing.enabled", true],
+]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_installation_simple.html b/dom/serviceworkers/test/test_installation_simple.html
new file mode 100644
index 0000000000..69c9518ea0
--- /dev/null
+++ b/dom/serviceworkers/test/test_installation_simple.html
@@ -0,0 +1,208 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 930348 - test stub Navigator ServiceWorker utilities.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    var p = navigator.serviceWorker.register("worker.js", { scope: "simpleregister/" });
+    ok(p instanceof Promise, "register() should return a Promise");
+    return Promise.resolve();
+  }
+
+  function sameOriginWorker() {
+    p = navigator.serviceWorker.register("http://some-other-origin/worker.js");
+    return p.then(function(w) {
+      ok(false, "Worker from different origin should fail");
+    }, function(e) {
+      ok(e.name === "SecurityError", "Should fail with a SecurityError");
+    });
+  }
+
+  function sameOriginScope() {
+    p = navigator.serviceWorker.register("worker.js", { scope: "http://www.example.com/" });
+    return p.then(function(w) {
+      ok(false, "Worker controlling scope for different origin should fail");
+    }, function(e) {
+      ok(e.name === "SecurityError", "Should fail with a SecurityError");
+    });
+  }
+
+  function httpsOnly() {
+    return SpecialPowers.pushPrefEnv({'set': [["dom.serviceWorkers.testing.enabled", false]] })
+    .then(function() {
+      return navigator.serviceWorker.register("/worker.js");
+    }).then(function(w) {
+      ok(false, "non-HTTPS pages cannot register ServiceWorkers");
+    }, function(e) {
+      ok(e.name === "TypeError", "navigator.serviceWorker should be undefined");
+    }).then(function() {
+      return SpecialPowers.popPrefEnv();
+    });
+  }
+
+  function realWorker() {
+    var p = navigator.serviceWorker.register("worker.js", { scope: "realworker" });
+    return p.then(function(wr) {
+      ok(wr instanceof ServiceWorkerRegistration, "Register a ServiceWorker");
+
+      info(wr.scope);
+      ok(wr.scope == (new URL("realworker", document.baseURI)).href, "Scope should match");
+      // active, waiting, installing should return valid worker instances
+      // because the registration is for the realworker scope, so the workers
+      // should be obtained for that scope and not for
+      // test_installation_simple.html
+      var worker = wr.installing;
+      ok(worker && wr.scope.match(/realworker$/) &&
+         worker.scriptURL.match(/worker.js$/), "Valid worker instance should be available.");
+      return wr.unregister().then(function(success) {
+        ok(success, "The worker should be unregistered successfully");
+      }, function(e) {
+        dump("Error unregistering the worker: " + e + "\n");
+      });
+    }, function(e) {
+      info("Error: " + e.name);
+      ok(false, "realWorker Registration should have succeeded!");
+    });
+  }
+
+  function networkError404() {
+    return navigator.serviceWorker.register("404.js", { scope: "network_error/"}).then(function(w) {
+        ok(false, "404 response should fail with TypeError");
+      }, function(e) {
+        ok(e.name === "TypeError", "404 response should fail with TypeError");
+      });
+  }
+
+  function redirectError() {
+    return navigator.serviceWorker.register("redirect_serviceworker.sjs", { scope: "redirect_error/" }).then(function(swr) {
+        ok(false, "redirection should fail");
+      }, function (e) {
+        ok(e.name === "SecurityError", "redirection should fail with SecurityError");
+      });
+  }
+
+  function parseError() {
+    var p = navigator.serviceWorker.register("parse_error_worker.js", { scope: "parse_error/" });
+    return p.then(function(wr) {
+      ok(false, "Registration should fail with parse error");
+      return navigator.serviceWorker.getRegistration("parse_error/").then(function(swr) {
+        // See https://github.com/slightlyoff/ServiceWorker/issues/547
+        is(swr, undefined, "A failed registration for a scope with no prior controllers should clear itself");
+      });
+    }, function(e) {
+      ok(e instanceof Error, "Registration should fail with parse error");
+    });
+  }
+
+  // FIXME(nsm): test for parse error when Update step doesn't happen (directly from register).
+
+  function updatefound() {
+    var frame = document.createElement("iframe");
+    frame.setAttribute("id", "simpleregister-frame");
+    frame.setAttribute("src", new URL("simpleregister/index.html", document.baseURI).href);
+    document.body.appendChild(frame);
+    var resolve, reject;
+    var p = new Promise(function(res, rej) {
+      resolve = res;
+      reject = rej;
+    });
+
+    var regPromise;
+    function continueTest() {
+      regPromise = navigator.serviceWorker.register(
+        "worker2.js", { scope: "simpleregister/" });
+    }
+
+    window.onmessage = function(e) {
+      if (e.data.type == "ready") {
+        continueTest();
+      } else if (e.data.type == "finish") {
+        window.onmessage = null;
+        // We have to make frame navigate away, otherwise it will call
+        // MaybeStopControlling() when this document is unloaded. At that point
+        // the pref has been disabled, so the ServiceWorkerManager is not available.
+        frame.setAttribute("src", new URL("about:blank").href);
+        regPromise.then(function(reg) {
+          reg.unregister().then(function(success) {
+            ok(success, "The worker should be unregistered successfully");
+            resolve();
+          }, function(error) {
+            dump("Error unregistering the worker: " + error + "\n");
+          });
+        });
+      } else if (e.data.type == "check") {
+        ok(e.data.status, e.data.msg);
+      }
+    }
+    return p;
+  }
+
+  var readyPromiseResolved = false;
+
+  function readyPromise() {
+    var frame = document.createElement("iframe");
+    frame.setAttribute("id", "simpleregister-frame-ready");
+    frame.setAttribute("src", new URL("simpleregister/ready.html", document.baseURI).href);
+    document.body.appendChild(frame);
+
+    var channel = new MessageChannel();
+    frame.addEventListener('load', function() {
+      frame.contentWindow.postMessage('your port!', '*', [channel.port2]);
+    });
+
+    channel.port1.onmessage = function() {
+      readyPromiseResolved = true;
+    }
+
+    return Promise.resolve();
+  }
+
+  function checkReadyPromise() {
+    ok(readyPromiseResolved, "The ready promise has been resolved!");
+    return Promise.resolve();
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(sameOriginWorker)
+      .then(sameOriginScope)
+      .then(httpsOnly)
+      .then(readyPromise)
+      .then(realWorker)
+      .then(networkError404)
+      .then(redirectError)
+      .then(parseError)
+      .then(updatefound)
+      .then(checkReadyPromise)
+      // put more tests here.
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["dom.caches.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_match_all.html b/dom/serviceworkers/test/test_match_all.html
new file mode 100644
index 0000000000..a1ee01507c
--- /dev/null
+++ b/dom/serviceworkers/test/test_match_all.html
@@ -0,0 +1,83 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - test match_all not crashing</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  // match_all_worker will call matchAll until the worker shuts down.
+  // Test passes if the browser doesn't crash on leaked promise objects.
+  var registration;
+  var content;
+  var iframe;
+
+  function simpleRegister() {
+    return navigator.serviceWorker.register("match_all_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then((swr) => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated', swr);
+      });
+  }
+
+  function closeAndUnregister() {
+    content.removeChild(iframe);
+
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function openClient() {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          resolve();
+        }
+      }
+    });
+
+    content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/simple.html");
+    content.appendChild(iframe);
+
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(openClient)
+      .then(closeAndUnregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(function() {
+        ok(true, "Didn't crash on resolving matchAll promises while worker shuts down.");
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_match_all_advanced.html b/dom/serviceworkers/test/test_match_all_advanced.html
new file mode 100644
index 0000000000..b4359511f3
--- /dev/null
+++ b/dom/serviceworkers/test/test_match_all_advanced.html
@@ -0,0 +1,102 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test matchAll with multiple clients</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var client_iframes = [];
+  var registration;
+
+  function start() {
+    return navigator.serviceWorker.register("match_all_advanced_worker.js",
+                                            { scope: "./sw_clients/" }).then(function(swr) {
+      registration = swr;
+      return waitForState(swr.installing, 'activated');
+    }).then(_ => {
+      window.onmessage = function (e) {
+        if (e.data === "READY") {
+          ok(registration.active, "Worker is active.");
+          registration.active.postMessage("RUN");
+        }
+      }
+    });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testMatchAll() {
+    var p = new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function (e) {
+        ok(e.data === client_iframes.length, "MatchAll returned the correct number of clients.");
+        res();
+      }
+    });
+
+    content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/service_worker_controlled.html");
+    content.appendChild(iframe);
+
+    client_iframes.push(iframe);
+    return p;
+  }
+
+  function removeAndTest() {
+    content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    content.removeChild(client_iframes.pop());
+    content.removeChild(client_iframes.pop());
+
+    return testMatchAll();
+  }
+
+  function runTest() {
+    start()
+      .then(testMatchAll)
+      .then(testMatchAll)
+      .then(testMatchAll)
+      .then(removeAndTest)
+      .then(function(e) {
+        content = document.getElementById("content");
+        while (client_iframes.length) {
+          content.removeChild(client_iframes.pop());
+        }
+      }).then(unregister).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(function() {
+        SimpleTest.finish();
+      });
+
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_match_all_client_id.html b/dom/serviceworkers/test/test_match_all_client_id.html
new file mode 100644
index 0000000000..0294c00aba
--- /dev/null
+++ b/dom/serviceworkers/test/test_match_all_client_id.html
@@ -0,0 +1,95 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1058311 - Test matchAll client id </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var clientURL = "match_all_client/match_all_client_id.html";
+  function start() {
+    return navigator.serviceWorker.register("match_all_client_id_worker.js",
+                                            { scope: "./match_all_client/" })
+      .then((swr) => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated', swr);
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function getMessageListener() {
+    return new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        ok(e.data, "Same client id for multiple calls.");
+        is(e.origin, "http://mochi.test:8888", "Event should have the correct origin");
+
+        if (!e.data) {
+          rej();
+          return;
+        }
+
+        info("DONE from: " + e.source);
+        res();
+      }
+    });
+  }
+
+  function testNestedWindow() {
+    var p = getMessageListener();
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+
+    content.appendChild(iframe);
+    iframe.setAttribute('src', clientURL);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function testAuxiliaryWindow() {
+    var p = getMessageListener();
+    var w = window.open(clientURL);
+
+    return p.then(() => w.close());
+  }
+
+  function runTest() {
+    info(window.opener == undefined);
+    start()
+      .then(testAuxiliaryWindow)
+      .then(testNestedWindow)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_match_all_client_properties.html b/dom/serviceworkers/test/test_match_all_client_properties.html
new file mode 100644
index 0000000000..c8a0b448c2
--- /dev/null
+++ b/dom/serviceworkers/test/test_match_all_client_properties.html
@@ -0,0 +1,101 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1058311 - Test matchAll clients properties </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var clientURL = "match_all_clients/match_all_controlled.html";
+  function start() {
+    return navigator.serviceWorker.register("match_all_properties_worker.js",
+                                            { scope: "./match_all_clients/" })
+      .then((swr) => {
+        registration = swr;
+        return waitForState(swr.installing, 'activated', swr);
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function getMessageListener() {
+    return new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (e.data.message === undefined) {
+          info("rejecting promise");
+          rej();
+          return;
+        }
+
+        ok(e.data.result, e.data.message);
+
+        if (!e.data.result) {
+          rej();
+        }
+        if (e.data.message == "DONE") {
+          info("DONE from: " + e.source);
+          res();
+        }
+      }
+    });
+  }
+
+  function testNestedWindow() {
+    var p = getMessageListener();
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+
+    content.appendChild(iframe);
+    iframe.setAttribute('src', clientURL);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function testAuxiliaryWindow() {
+    var p = getMessageListener();
+    var w = window.open(clientURL);
+
+    return p.then(() => w.close());
+  }
+
+  function runTest() {
+    info("catalin");
+    info(window.opener == undefined);
+    start()
+      .then(testAuxiliaryWindow)
+      .then(testNestedWindow)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_navigationPreload_disable_crash.html b/dom/serviceworkers/test/test_navigationPreload_disable_crash.html
new file mode 100644
index 0000000000..ea6439284d
--- /dev/null
+++ b/dom/serviceworkers/test/test_navigationPreload_disable_crash.html
@@ -0,0 +1,52 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Failure to create a Promise shouldn't crash</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  async function runTest() {
+    const iframe = document.createElement('iframe');
+    document.getElementById("content").appendChild(iframe);
+
+    const serviceWorker = iframe.contentWindow.navigator.serviceWorker;
+    const worker = await iframe.contentWindow.navigator.serviceWorker.register("empty.js", {});
+
+    iframe.remove();
+
+    // We can't wait for this promise to settle, because the global's
+    // browsing context has been discarded when the iframe was removed.
+    // We're just checking if this call crashes, which would happen
+    // immediately, so ignoring the promise should be fine.
+    worker.navigationPreload.disable();
+    ok(true, "navigationPreload.disable() failed but didn't crash.");
+
+    SimpleTest.finish();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  // We can't call unregister on the worker after its browsing context has been
+  // discarded, so use SpecialPowers.removeAllServiceWorkerData.
+  SimpleTest.registerCleanupFunction(() => SpecialPowers.removeAllServiceWorkerData());
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.navigationPreload.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_navigator.html b/dom/serviceworkers/test/test_navigator.html
new file mode 100644
index 0000000000..aaac04e926
--- /dev/null
+++ b/dom/serviceworkers/test/test_navigator.html
@@ -0,0 +1,40 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 930348 - test stub Navigator ServiceWorker utilities.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function checkEnabled() {
+    ok(navigator.serviceWorker, "navigator.serviceWorker should exist when ServiceWorkers are enabled.");
+    ok(typeof navigator.serviceWorker.register === "function", "navigator.serviceWorker.register() should be a function.");
+    ok(typeof navigator.serviceWorker.getRegistration === "function", "navigator.serviceWorker.getAll() should be a function.");
+    ok(typeof navigator.serviceWorker.getRegistrations === "function", "navigator.serviceWorker.getAll() should be a function.");
+    ok(navigator.serviceWorker.ready instanceof Promise, "navigator.serviceWorker.ready should be a Promise.");
+    ok(navigator.serviceWorker.controller === null, "There should be no controller worker for an uncontrolled document.");
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, function() {
+    checkEnabled();
+    SimpleTest.finish();
+  });
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_nofetch_handler.html b/dom/serviceworkers/test/test_nofetch_handler.html
new file mode 100644
index 0000000000..0725a68561
--- /dev/null
+++ b/dom/serviceworkers/test/test_nofetch_handler.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bugs 1181127 and 1325101</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1181127">Mozilla Bug 1181127</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1181127">Mozilla Bug 1325101</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    // Make sure the event handler during the install event persists. This ensures
+    // the reason for which the interception doesn't occur is because of the
+    // handlesFetch=false flag from ServiceWorkerInfo.
+    ["dom.serviceWorkers.idle_timeout", 299999],
+  ]});
+});
+
+var iframeg;
+function create_iframe(url) {
+  return new Promise(function(res) {
+    iframe = document.createElement('iframe');
+    iframe.src = url;
+    iframe.onload = function() { res(iframe) }
+    document.body.appendChild(iframe);
+    iframeg = iframe;
+  })
+}
+
+add_task(async function test_nofetch_worker() {
+  let registration = await navigator.serviceWorker.register(
+    "nofetch_handler_worker.js", { scope: "./nofetch_handler_worker/"} )
+    .then(swr => waitForState(swr.installing, 'activated', swr));
+
+  let iframe = await create_iframe("./nofetch_handler_worker/doesnt_exist.html");
+  ok(!iframe.contentDocument.body.innerHTML.includes("intercepted"), "Request was not intercepted.");
+
+  await SpecialPowers.popPrefEnv();
+  await registration.unregister();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_not_intercept_plugin.html b/dom/serviceworkers/test/test_not_intercept_plugin.html
new file mode 100644
index 0000000000..4e7654deea
--- /dev/null
+++ b/dom/serviceworkers/test/test_not_intercept_plugin.html
@@ -0,0 +1,75 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1187766 - Test loading plugins scenarios with fetch interception.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  SimpleTest.requestCompleteLog();
+
+  var registration;
+  function simpleRegister() {
+    var p = navigator.serviceWorker.register("./fetch/plugin/worker.js", { scope: "./fetch/plugin/" });
+    return p.then(function(swr) {
+      registration = swr;
+      return waitForState(swr.installing, 'activated');
+    });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(success) {
+      ok(success, "Service worker should be unregistered successfully");
+    }, function(e) {
+      dump("SW unregistration error: " + e + "\n");
+    });
+  }
+
+  function testPlugins() {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data.status == "ok") {
+          ok(e.data.result, e.data.message);
+        } else if (e.data.status == "done") {
+          window.onmessage = null;
+          w.close();
+          resolve();
+        }
+      }
+    });
+
+    var w = window.open("fetch/plugin/plugins.html");
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(testPlugins)
+      .then(unregister)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notification_constructor_error.html b/dom/serviceworkers/test/test_notification_constructor_error.html
new file mode 100644
index 0000000000..46d93e781f
--- /dev/null
+++ b/dom/serviceworkers/test/test_notification_constructor_error.html
@@ -0,0 +1,51 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug XXXXXXX - Check that Notification constructor throws in ServiceWorkerGlobalScope</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    return navigator.serviceWorker.register("notification_constructor_error.js", { scope: "notification_constructor_error/" }).then(function(swr) {
+      ok(false, "Registration should fail.");
+    }, function(e) {
+      is(e.name, 'TypeError', "Registration should fail with a TypeError.");
+    });
+  }
+
+  function runTest() {
+    MockServices.register();
+    simpleRegister()
+      .then(function() {
+        MockServices.unregister();
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        MockServices.unregister();
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notification_get.html b/dom/serviceworkers/test/test_notification_get.html
new file mode 100644
index 0000000000..6c3d1b10c7
--- /dev/null
+++ b/dom/serviceworkers/test/test_notification_get.html
@@ -0,0 +1,136 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>ServiceWorkerRegistration.getNotifications() on main thread and worker thread.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script type="text/javascript">
+
+  SimpleTest.requestFlakyTimeout("untriaged");
+
+  function testFrame(src) {
+    return new Promise(function(resolve, reject) {
+      var iframe = document.createElement("iframe");
+      iframe.src = src;
+      window.callback = function(result) {
+        iframe.src = "about:blank";
+        document.body.removeChild(iframe);
+        iframe = null;
+        SpecialPowers.exactGC(function() {
+          resolve(result);
+        });
+      };
+      document.body.appendChild(iframe);
+    });
+  }
+
+  function registerSW() {
+    return testFrame('notification/register.html').then(function() {
+      ok(true, "Registered service worker.");
+    });
+  }
+
+  async function unregisterSW() {
+    const reg = await navigator.serviceWorker.getRegistration("./notification/");
+    await reg.unregister();
+  }
+
+  function testDismiss() {
+    // Dismissed persistent notifications should be removed from the
+    // notification list.
+    var alertsService = SpecialPowers.Cc["@mozilla.org/alerts-service;1"]
+                                     .getService(SpecialPowers.Ci.nsIAlertsService);
+    return navigator.serviceWorker.getRegistration("./notification/")
+      .then(function(reg) {
+        return reg.showNotification(
+          "This is a notification that will be closed", { tag: "dismiss" })
+          .then(function() {
+            return reg;
+          });
+      }).then(function(reg) {
+        return reg.getNotifications()
+          .then(function(notifications) {
+            is(notifications.length, 1, "There should be one visible notification");
+            is(notifications[0].tag, "dismiss", "Tag should match");
+
+            // Simulate dismissing the notification by using the alerts service
+            // directly, instead of `Notification#close`.
+            var principal = SpecialPowers.wrap(document).nodePrincipal;
+            var id = principal.origin + "#tag:dismiss";
+            alertsService.closeAlert(id, principal);
+
+            return reg;
+          });
+      }).then(function(reg) {
+        return reg.getNotifications();
+      }).then(function(notifications) {
+        // Make sure dismissed notifications are no longer retrieved.
+        is(notifications.length, 0, "There should be no more stored notifications");
+      });
+  }
+
+  function testGet() {
+    var options = NotificationTest.payload;
+    return navigator.serviceWorker.getRegistration("./notification/")
+      .then(function(reg) {
+        return reg.showNotification("This is a title", options)
+                 .then(function() {
+                  return reg;
+                 });
+      }).then(function(reg) {
+        return reg.getNotifications();
+      }).then(function(notifications) {
+        is(notifications.length, 1, "There should be one stored notification");
+        var notification = notifications[0];
+        ok(notification instanceof Notification, "Should be a Notification");
+        is(notification.title, "This is a title", "Title should match");
+        for (var key in options) {
+          is(notification[key], options[key], key + " property should match");
+        }
+        notification.close();
+      }).then(function() {
+        return navigator.serviceWorker.getRegistration("./notification/").then(function(reg) {
+          return reg.getNotifications();
+        });
+      }).then(function(notifications) {
+        // Make sure closed notifications are no longer retrieved.
+        is(notifications.length, 0, "There should be no more stored notifications");
+      }).catch(function(e) {
+        ok(false, "Something went wrong " + e.message);
+      })
+  }
+
+  function testGetWorker() {
+    todo(false, "navigator.serviceWorker is not available on workers yet");
+    return Promise.resolve();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+  MockServices.register();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+  ]}, function() {
+    registerSW()
+      .then(testGet)
+      .then(testGetWorker)
+      .then(testDismiss)
+      .then(unregisterSW)
+      .then(function() {
+        MockServices.unregister();
+        SimpleTest.finish();
+      });
+  });
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notification_openWindow.html b/dom/serviceworkers/test/test_notification_openWindow.html
new file mode 100644
index 0000000000..5180f20f37
--- /dev/null
+++ b/dom/serviceworkers/test/test_notification_openWindow.html
@@ -0,0 +1,89 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1578070</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="utils.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+// eslint-disable-next-line mozilla/no-addtask-setup
+add_task(async function setup() {
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+    ["dom.serviceWorkers.disable_open_click_delay", 1000],
+    ["dom.serviceWorkers.idle_timeout", 299999],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999]
+  ]});
+
+  MockServices.register();
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show and click events.");
+  SimpleTest.registerCleanupFunction(() => {
+    MockServices.unregister();
+  });
+});
+
+add_task(async function test() {
+  info("Registering service worker.");
+  let swr = await navigator.serviceWorker.register("notification_openWindow_worker.js");
+  await waitForState(swr.installing, "activated");
+
+  SimpleTest.registerCleanupFunction(async () => {
+    await swr.unregister();
+    navigator.serviceWorker.onmessage = null;
+  });
+
+  for (let prefValue of [
+    SpecialPowers.Ci.nsIBrowserDOMWindow.OPEN_CURRENTWINDOW,
+    SpecialPowers.Ci.nsIBrowserDOMWindow.OPEN_NEWWINDOW,
+    SpecialPowers.Ci.nsIBrowserDOMWindow.OPEN_NEWTAB,
+  ]) {
+    if (prefValue == SpecialPowers.Ci.nsIBrowserDOMWindow.OPEN_CURRENTWINDOW) {
+      // Let's open a new tab and focus on it. When the service
+      // worker notification is shown, the document will open in the focused tab.
+      // If we don't open a new tab, the document will be opened in the
+      // current test-runner tab and mess up the test setup.
+      window.open("");
+    }
+    info(`Setting browser.link.open_newwindow to ${prefValue}.`);
+    await SpecialPowers.pushPrefEnv({
+      set: [["browser.link.open_newwindow", prefValue]],
+    });
+
+    // The onclicknotification handler uses Clients.openWindow() to open a new
+    // window. This newly created window will attempt to open another window with
+    // Window.open() and some arbitrary URL. We crash before the second window
+    // finishes loading.
+    info("Showing notification.");
+    await swr.showNotification("notification");
+
+    info("Waiting for \"DONE\" from worker.");
+    await new Promise(resolve => {
+      navigator.serviceWorker.onmessage = event => {
+        if (event.data !== "DONE") {
+          ok(false, `Unexpected message from service worker: ${JSON.stringify(event.data)}`);
+        }
+        resolve();
+      }
+    });
+
+    // If we make it here, then we didn't crash.
+    ok(true, "Didn't crash!");
+
+    navigator.serviceWorker.onmessage = null;
+  }
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notificationclick-otherwindow.html b/dom/serviceworkers/test/test_notificationclick-otherwindow.html
new file mode 100644
index 0000000000..5f35757929
--- /dev/null
+++ b/dom/serviceworkers/test/test_notificationclick-otherwindow.html
@@ -0,0 +1,63 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=916893
+-->
+<head>
+  <title>Bug 1114554 - Test ServiceWorkerGlobalScope.notificationclick event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1114554">Bug 1114554</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+<script src="utils.js"></script>
+<script type="text/javascript">
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show and click events.");
+
+  function testFrame(src) {
+    var iframe = document.createElement("iframe");
+    iframe.src = src;
+    window.callback = function(result) {
+      window.callback = null;
+      document.body.removeChild(iframe);
+      iframe = null;
+      ok(result, "Got notificationclick event with correct data.");
+      MockServices.unregister();
+      registration.unregister().then(function() {
+        SimpleTest.finish();
+      });
+    };
+    document.body.appendChild(iframe);
+  }
+
+  var registration;
+
+  function runTest() {
+    MockServices.register();
+    navigator.serviceWorker.register("notificationclick.js", { scope: "notificationclick-otherwindow.html" }).then(function(reg) {
+      registration = reg;
+      return waitForState(reg.installing, 'activated');
+    }, function(e) {
+      ok(false, "registration should have passed!");
+    }).then(() => {
+      testFrame('notificationclick-otherwindow.html');
+    });
+  };
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+  ]}, runTest);
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notificationclick.html b/dom/serviceworkers/test/test_notificationclick.html
new file mode 100644
index 0000000000..ea85ae56c7
--- /dev/null
+++ b/dom/serviceworkers/test/test_notificationclick.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=916893
+-->
+<head>
+  <title>Bug 1114554 - Test ServiceWorkerGlobalScope.notificationclick event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1114554">Bug 1114554</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+<script src="utils.js"></script>
+<script type="text/javascript">
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show and click events.");
+
+  function testFrame(src) {
+    var iframe = document.createElement("iframe");
+    iframe.src = src;
+    window.callback = function(result) {
+      window.callback = null;
+      document.body.removeChild(iframe);
+      iframe = null;
+      ok(result, "Got notificationclick event with correct data.");
+      MockServices.unregister();
+      registration.unregister().then(function() {
+        SimpleTest.finish();
+      });
+    };
+    document.body.appendChild(iframe);
+  }
+
+  var registration;
+
+  function runTest() {
+    MockServices.register();
+    navigator.serviceWorker.register("notificationclick.js", { scope: "notificationclick.html" }).then(function(reg) {
+      registration = reg;
+      return waitForState(reg.installing, 'activated');
+    }, function(e) {
+      ok(false, "registration should have passed!");
+    }).then(() => {
+      // Now that we know the document will be controlled, create the frame.
+      testFrame('notificationclick.html');
+    });
+  };
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+  ]}, runTest);
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notificationclick_focus.html b/dom/serviceworkers/test/test_notificationclick_focus.html
new file mode 100644
index 0000000000..2ce0c6a809
--- /dev/null
+++ b/dom/serviceworkers/test/test_notificationclick_focus.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=916893
+-->
+<head>
+  <title>Bug 1144660 - Test client.focus() permissions on notification click</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1114554">Bug 1114554</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+<script src="utils.js"></script>
+<script type="text/javascript">
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show and click events.");
+
+  function testFrame(src) {
+    var iframe = document.createElement("iframe");
+    iframe.src = src;
+    window.callback = function(result) {
+      window.callback = null;
+      document.body.removeChild(iframe);
+      iframe = null;
+      ok(result, "All tests passed.");
+      MockServices.unregister();
+      registration.unregister().then(function() {
+        SimpleTest.finish();
+      });
+    };
+    document.body.appendChild(iframe);
+  }
+
+  var registration;
+
+  function runTest() {
+    MockServices.register();
+    navigator.serviceWorker.register("notificationclick_focus.js", { scope: "notificationclick_focus.html" }).then(function(reg) {
+      registration = reg;
+      return waitForState(reg.installing, 'activated');
+    }, function(e) {
+      ok(false, "registration should have passed!");
+    }).then(() => {
+      testFrame('notificationclick_focus.html');
+    });
+  };
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+    ["dom.serviceWorkers.disable_open_click_delay", 1000],
+  ]}, runTest);
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_notificationclose.html b/dom/serviceworkers/test/test_notificationclose.html
new file mode 100644
index 0000000000..936501fafd
--- /dev/null
+++ b/dom/serviceworkers/test/test_notificationclose.html
@@ -0,0 +1,65 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1265841
+-->
+<head>
+  <title>Bug 1265841 - Test ServiceWorkerGlobalScope.notificationclose event.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1265841">Bug 1265841</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+<script src="utils.js"></script>
+<script type="text/javascript">
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show, click, and close events.");
+
+  function testFrame(src) {
+    var iframe = document.createElement("iframe");
+    iframe.src = src;
+    window.callback = function(data) {
+      window.callback = null;
+      document.body.removeChild(iframe);
+      iframe = null;
+      ok(data.result, "Got notificationclose event with correct data.");
+      ok(!data.windowOpened,
+         "Shouldn't allow to openWindow in notificationclose");
+      MockServices.unregister();
+      registration.unregister().then(function() {
+        SimpleTest.finish();
+      });
+    };
+    document.body.appendChild(iframe);
+  }
+
+  var registration;
+
+  function runTest() {
+    MockServices.register();
+    navigator.serviceWorker.register("notificationclose.js", { scope: "notificationclose.html" }).then(function(reg) {
+      registration = reg;
+      return waitForState(reg.installing, 'activated');
+    }, function(e) {
+      ok(false, "registration should have passed!");
+    }).then(() => {
+      testFrame('notificationclose.html');
+    });
+  };
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+  ]}, runTest);
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_onmessageerror.html b/dom/serviceworkers/test/test_onmessageerror.html
new file mode 100644
index 0000000000..425b890951
--- /dev/null
+++ b/dom/serviceworkers/test/test_onmessageerror.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test onmessageerror event handlers</title>
+  </head>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="utils.js"></script>
+  <script>
+    /**
+     * Test that ServiceWorkerGlobalScope and ServiceWorkerContainer handle
+     * `messageerror` events, using a test helper class `StructuredCloneTester`.
+     * Intances of this class can be configured to fail to serialize or
+     * deserialize, as it's difficult to artificially create the case where an
+     * object successfully serializes but fails to deserialize (which can be
+     * caused by out-of-memory failures or the target global not supporting a
+     * serialized interface).
+     */
+
+    let registration = null;
+    let serviceWorker = null;
+    let serviceWorkerContainer = null;
+    const swScript = 'onmessageerror_worker.js';
+
+    add_task(async () => {
+      await SpecialPowers.pushPrefEnv({
+        set: [
+          ['dom.serviceWorkers.enabled', true],
+          ['dom.serviceWorkers.testing.enabled', true],
+          ['dom.testing.structuredclonetester.enabled', true],
+        ],
+      });
+
+      swContainer = navigator.serviceWorker;
+
+      registration = await swContainer.register(swScript);
+      ok(registration, 'Service Worker regsisters');
+
+      serviceWorker = registration.installing;
+      await waitForState(serviceWorker, 'activated');
+    }); // setup
+
+    add_task(async () => {
+      const serializable = true;
+      const deserializable = true;
+      let sct = new StructuredCloneTester(serializable, deserializable);
+
+      const p = new Promise((resolve, reject) => {
+        function onMessage(e) {
+          const expectedBehavior = 'Serializable and deserializable ' +
+            'StructuredCloneTester serializes and deserializes';
+
+          is(e.data.received, 'message', expectedBehavior);
+          swContainer.removeEventListener('message', onMessage);
+          resolve();
+        }
+
+        swContainer.addEventListener('message', onMessage);
+      });
+
+      serviceWorker.postMessage({ serializable, deserializable, sct });
+
+      await p;
+    });
+
+    add_task(async () => {
+      const serializable = false;
+      // if it's not serializable, being deserializable or not doesn't matter
+      const deserializable = false;
+      let sct = new StructuredCloneTester(serializable, deserializable);
+
+      try {
+        serviceWorker.postMessage({ serializable, deserializable, sct });
+        ok(false, 'StructuredCloneTester serialization should have thrown -- ' +
+          'this line should not have been reached.');
+      } catch (e) {
+        const expectedBehavior = 'Unserializable StructuredCloneTester fails ' +
+          `to send, with exception name: ${e.name}`;
+        is(e.name, 'DataCloneError', expectedBehavior);
+      }
+    });
+
+    add_task(async () => {
+      const serializable = true;
+      const deserializable = false;
+      let sct = new StructuredCloneTester(serializable, deserializable);
+
+      const p = new Promise((resolve, reject) => {
+        function onMessage(e) {
+          const expectedBehavior = 'ServiceWorkerGlobalScope handles ' +
+            'messageerror events';
+
+          is(e.data.received, 'messageerror', expectedBehavior);
+          swContainer.removeEventListener('message', onMessage);
+          resolve();
+        }
+
+        swContainer.addEventListener('message', onMessage);
+      });
+
+      serviceWorker.postMessage({ serializable, deserializable, sct });
+
+      await p;
+    }); // test ServiceWorkerGlobalScope onmessageerror
+
+    add_task(async () => {
+      const p = new Promise((resolve, reject) => {
+        function onMessageError(e) {
+          ok(true, 'ServiceWorkerContainer handles messageerror events');
+          swContainer.removeEventListener('messageerror', onMessageError);
+          resolve();
+        }
+
+        swContainer.addEventListener('messageerror', onMessageError);
+      });
+
+      serviceWorker.postMessage('send-bad-message');
+
+      await p;
+    }); // test ServiceWorkerContainer onmessageerror
+
+    add_task(async () => {
+      await SpecialPowers.popPrefEnv();
+      ok(await registration.unregister(), 'Service Worker unregisters');
+    }); // teardown
+  </script>
+  <body>
+  </body>
+</html>
diff --git a/dom/serviceworkers/test/test_opaque_intercept.html b/dom/serviceworkers/test/test_opaque_intercept.html
new file mode 100644
index 0000000000..095f2e5f63
--- /dev/null
+++ b/dom/serviceworkers/test/test_opaque_intercept.html
@@ -0,0 +1,92 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test service worker post message </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  var registration;
+  function start() {
+    return navigator.serviceWorker.register("opaque_intercept_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then((swr) => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testOpaqueIntercept(swr) {
+    var p = new Promise(function(res, rej) {
+      var ready = false;
+      var scriptLoaded = false;
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          ok(!ready, "ready message should only be received once");
+          ok(!scriptLoaded, "ready message should be received before script loaded");
+          if (ready) {
+            res();
+            return;
+          }
+          ready = true;
+          iframe.contentWindow.postMessage("REFRESH", "*");
+        } else if (e.data === "SCRIPT_LOADED") {
+          ok(ready, "script loaded should be received after ready");
+          ok(!scriptLoaded, "script loaded message should be received only once");
+          scriptLoaded = true;
+          res();
+        }
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    var iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/refresher.html");
+    content.appendChild(iframe);
+
+    // Our service worker waits for us to finish installing. If it didn't do
+    // this, then loading our frame would race with it becoming active,
+    // possibly intercepting the first load of the iframe. This guarantees
+    // that our iframe will load first directly from the network. Note that
+    // refresher.html explicitly waits for the service worker to transition to
+    // active.
+    registration.installing.postMessage("ready");
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testOpaqueIntercept)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_openWindow.html b/dom/serviceworkers/test/test_openWindow.html
new file mode 100644
index 0000000000..85e5ea26da
--- /dev/null
+++ b/dom/serviceworkers/test/test_openWindow.html
@@ -0,0 +1,110 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1172870
+-->
+<head>
+  <title>Bug 1172870 - Test clients.openWindow</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/MockServices.js"></script>
+  <script type="text/javascript" src="/tests/dom/notification/test/mochitest/NotificationTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1172870">Bug 1172870</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+<script src="utils.js"></script>
+<script type="text/javascript">
+  SimpleTest.requestFlakyTimeout("Mock alert service dispatches show and click events.");
+
+  function setup(ctx) {
+    MockServices.register();
+
+    return navigator.serviceWorker.register("openWindow_worker.js", {scope: "./"})
+      .then(function(swr) {
+        ok(swr, "Registration successful");
+        ctx.registration = swr;
+        return waitForState(swr.installing, 'activated', ctx);
+      });
+  }
+
+  function setupMessageHandler(ctx) {
+    return new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function(event) {
+        navigator.serviceWorker.onmessage = null;
+        for (i = 0; i < event.data.length; i++) {
+          ok(event.data[i].result, event.data[i].message);
+        }
+        res(ctx);
+      }
+    });
+  }
+
+  function testPopupNotAllowed(ctx) {
+    var p = setupMessageHandler(ctx);
+    ok(ctx.registration.active, "Worker is active.");
+    ctx.registration.active.postMessage("testNoPopup");
+
+    return p;
+  }
+
+  function testPopupAllowed(ctx) {
+    var p = setupMessageHandler(ctx);
+    ctx.registration.showNotification("testPopup");
+
+    return p;
+  }
+
+  function checkNumberOfWindows(ctx) {
+    return new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function(event) {
+        navigator.serviceWorker.onmessage = null;
+        for (i = 0; i < event.data.length; i++) {
+          ok(event.data[i].result, event.data[i].message);
+        }
+        res(ctx);
+      }
+      ctx.registration.active.postMessage("CHECK_NUMBER_OF_WINDOWS");
+    });
+  }
+
+  function clear(ctx) {
+    MockServices.unregister();
+
+    return ctx.registration.unregister().then(function(result) {
+      ctx.registration = null;
+      ok(result, "Unregister was successful.");
+    });
+  }
+
+  function runTest() {
+    setup({})
+      // Permission to allow popups persists for some time after a notification
+      // click event, so the order here is important.
+      .then(testPopupNotAllowed)
+      .then(testPopupAllowed)
+      .then(checkNumberOfWindows)
+      .then(clear)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["notification.prompt.testing", true],
+    ["dom.serviceWorkers.disable_open_click_delay", 1000],
+    ["dom.serviceWorkers.idle_timeout", 299999],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999],
+    ["dom.securecontext.allowlist", "mochi.test,example.com"],
+  ]}, runTest);
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_origin_after_redirect.html b/dom/serviceworkers/test/test_origin_after_redirect.html
new file mode 100644
index 0000000000..e9cd6ea929
--- /dev/null
+++ b/dom/serviceworkers/test/test_origin_after_redirect.html
@@ -0,0 +1,57 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("/tests/dom/serviceworkers/test/fetch/origin/index.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "http://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["dom.security.https_first", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_origin_after_redirect_cached.html b/dom/serviceworkers/test/test_origin_after_redirect_cached.html
new file mode 100644
index 0000000000..a7c36d24d8
--- /dev/null
+++ b/dom/serviceworkers/test/test_origin_after_redirect_cached.html
@@ -0,0 +1,57 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("/tests/dom/serviceworkers/test/fetch/origin/index-cached.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "http://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["dom.security.https_first", false],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_origin_after_redirect_to_https.html b/dom/serviceworkers/test/test_origin_after_redirect_to_https.html
new file mode 100644
index 0000000000..2e0173cefd
--- /dev/null
+++ b/dom/serviceworkers/test/test_origin_after_redirect_to_https.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("/tests/dom/serviceworkers/test/fetch/origin/index-to-https.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "https://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_origin_after_redirect_to_https_cached.html b/dom/serviceworkers/test/test_origin_after_redirect_to_https_cached.html
new file mode 100644
index 0000000000..12a88865c2
--- /dev/null
+++ b/dom/serviceworkers/test/test_origin_after_redirect_to_https_cached.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the origin of a redirected response from a service worker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  function runTest() {
+    iframe = document.querySelector("iframe");
+    iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/register.html";
+    var win;
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        win = window.open("/tests/dom/serviceworkers/test/fetch/origin/index-to-https-cached.sjs", "mywindow", "width=100,height=100");
+      } else if (e.data.status == "domain") {
+        is(e.data.data, "example.org", "Correct domain expected");
+      } else if (e.data.status == "origin") {
+        is(e.data.data, "https://example.org", "Correct origin expected");
+      } else if (e.data.status == "done") {
+        win.close();
+        iframe.src = "/tests/dom/serviceworkers/test/fetch/origin/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_post_message.html b/dom/serviceworkers/test/test_post_message.html
new file mode 100644
index 0000000000..b72f948dd6
--- /dev/null
+++ b/dom/serviceworkers/test/test_post_message.html
@@ -0,0 +1,80 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test service worker post message </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var magic_value = "MAGIC_VALUE_123";
+  var registration;
+  function start() {
+    return navigator.serviceWorker.register("message_posting_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then(swr => waitForState(swr.installing, 'activated', swr))
+      .then((swr) => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testPostMessage(swr) {
+    var p = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          swr.active.postMessage(magic_value);
+        } else if (e.data === magic_value) {
+          ok(true, "Worker posted the correct value.");
+          res();
+        } else {
+          ok(false, "Wrong value. Expected: " + magic_value +
+                    ", got: " + e.data);
+          res();
+        }
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/service_worker_controlled.html");
+    content.appendChild(iframe);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testPostMessage)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_post_message_advanced.html b/dom/serviceworkers/test/test_post_message_advanced.html
new file mode 100644
index 0000000000..580dfd3f07
--- /dev/null
+++ b/dom/serviceworkers/test/test_post_message_advanced.html
@@ -0,0 +1,109 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982726 - Test service worker post message advanced </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var base = ["string", true, 42];
+  var blob = new Blob(["blob_content"]);
+  var file = new File(["file_content"], "file");
+  var obj = { body : "object_content" };
+
+  function readBlob(blobToRead) {
+    return new Promise(function(resolve, reject) {
+      var reader = new FileReader();
+      reader.onloadend = () => resolve(reader.result);
+      reader.readAsText(blobToRead);
+    });
+  }
+
+  function equals(v1, v2) {
+    return Promise.all([v1, v2]).then(function(val) {
+      ok(val[0] === val[1], "Values should match.");
+    });
+  }
+
+  function blob_equals(b1, b2) {
+    return equals(readBlob(b1), readBlob(b2));
+  }
+
+  function file_equals(f1, f2) {
+    return equals(f1.name, f2.name).then(blob_equals(f1, f2));
+  }
+
+  function obj_equals(o1, o2) {
+    return equals(o1.body, o2.body);
+  }
+
+  function start() {
+    return navigator.serviceWorker.register("message_posting_worker.js",
+                                            { scope: "./sw_clients/" })
+      .then(swr => waitForState(swr.installing, 'activated', swr))
+      .then((swr) => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function testPostMessageObject(object, test) {
+    var p = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          registration.active.postMessage(object)
+        } else {
+          test(object, e.data).then(res);
+        }
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "sw_clients/service_worker_controlled.html");
+    content.appendChild(iframe);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    start()
+      .then(testPostMessageObject.bind(this, base[0], equals))
+      .then(testPostMessageObject.bind(this, base[1], equals))
+      .then(testPostMessageObject.bind(this, base[2], equals))
+      .then(testPostMessageObject.bind(this, blob, blob_equals))
+      .then(testPostMessageObject.bind(this, file, file_equals))
+      .then(testPostMessageObject.bind(this, obj, obj_equals))
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_post_message_source.html b/dom/serviceworkers/test/test_post_message_source.html
new file mode 100644
index 0000000000..b72ebe3a7c
--- /dev/null
+++ b/dom/serviceworkers/test/test_post_message_source.html
@@ -0,0 +1,66 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1142015 - Test service worker post message source </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  var magic_value = "MAGIC_VALUE_RANDOM";
+  var registration;
+  function start() {
+    return navigator.serviceWorker.register("source_message_posting_worker.js",
+                                            { scope: "./nonexistent_scope/" })
+      .then((swr) => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testPostMessage(swr) {
+    var p = new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function(e) {
+        ok(e.data === magic_value, "Worker posted the correct value.");
+        res();
+      }
+    });
+
+    ok(swr.installing, "Installing worker exists.");
+    swr.installing.postMessage(magic_value);
+    return p;
+  }
+
+
+  function runTest() {
+    start()
+      .then(testPostMessage)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_privateBrowsing.html b/dom/serviceworkers/test/test_privateBrowsing.html
new file mode 100644
index 0000000000..e33272d641
--- /dev/null
+++ b/dom/serviceworkers/test/test_privateBrowsing.html
@@ -0,0 +1,105 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>Test for ServiceWorker - Private Browsing</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+</head>
+<body>
+
+<script type="application/javascript">
+const {BrowserTestUtils} = ChromeUtils.importESModule(
+  "resource://testing-common/BrowserTestUtils.sys.mjs"
+);
+
+var mainWindow;
+
+var contentPage = "http://mochi.test:8888/chrome/dom/workers/test/empty.html";
+var workerScope = "http://mochi.test:8888/chrome/dom/serviceworkers/test/";
+var workerURL = workerScope + "worker.js";
+
+function testOnWindow(aIsPrivate, aCallback) {
+  var win = mainWindow.OpenBrowserWindow({private: aIsPrivate});
+  win.addEventListener("load", function() {
+    win.addEventListener("DOMContentLoaded", function onInnerLoad() {
+      if (win.content.location.href != contentPage) {
+        BrowserTestUtils.startLoadingURIString(win.gBrowser, contentPage);
+        return;
+      }
+
+      win.removeEventListener("DOMContentLoaded", onInnerLoad, true);
+      SimpleTest.executeSoon(function() { aCallback(win); });
+    }, true);
+  }, {capture: true, once: true});
+}
+
+function setupWindow() {
+  mainWindow = window.browsingContext.topChromeWindow;
+  runTest();
+}
+
+var wN;
+var registration;
+var wP;
+
+function testPrivateWindow() {
+  testOnWindow(true, function(aWin) {
+    wP = aWin;
+    ok(!wP.content.eval('"serviceWorker" in navigator'), "ServiceWorkers are not available for private windows");
+    runTest();
+  });
+}
+
+function doTests() {
+  testOnWindow(false, function(aWin) {
+    wN = aWin;
+    ok("serviceWorker" in wN.content.navigator, "ServiceWorkers are available for normal windows");
+
+    wN.content.navigator.serviceWorker.register(workerURL,
+                                                { scope: workerScope })
+      .then(function(aRegistration) {
+        registration = aRegistration;
+        ok(registration, "Registering a service worker in a normal window should succeed");
+
+        // Bug 1255621: We should be able to load a controlled document in a private window.
+        testPrivateWindow();
+      }, function(aError) {
+        ok(false, "Error registering worker in normal window: " + aError);
+        testPrivateWindow();
+      });
+  });
+}
+
+var steps = [
+  setupWindow,
+  doTests
+];
+
+function cleanup() {
+  wN.close();
+  wP.close();
+
+  SimpleTest.finish();
+}
+
+function runTest() {
+  if (!steps.length) {
+    registration.unregister().then(cleanup, cleanup);
+
+    return;
+  }
+
+  var step = steps.shift();
+  step();
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({"set": [
+  ["dom.serviceWorkers.enabled", true],
+  ["dom.serviceWorkers.testing.enabled", true],
+  ["browser.startup.page", 0],
+  ["browser.startup.homepage_override.mstone", "ignore"],
+]}, runTest);
+
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_register_base.html b/dom/serviceworkers/test/test_register_base.html
new file mode 100644
index 0000000000..3a1f2f2621
--- /dev/null
+++ b/dom/serviceworkers/test/test_register_base.html
@@ -0,0 +1,34 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that registering a service worker uses the docuemnt URI for the secure origin check</title>
+  <script type="text/javascript" src="http://mochi.test:8888/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="http://mochi.test:8888/tests/SimpleTest/test.css" />
+  <base href="https://mozilla.org/">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function runTest() {
+    ok(!("serviceWorker" in navigator), "ServiceWorkerContainer shouldn't be defined");
+    SimpleTest.finish();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_register_https_in_http.html b/dom/serviceworkers/test/test_register_https_in_http.html
new file mode 100644
index 0000000000..096c3733a0
--- /dev/null
+++ b/dom/serviceworkers/test/test_register_https_in_http.html
@@ -0,0 +1,45 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1172948 - Test that registering a service worker from inside an HTTPS iframe embedded in an HTTP iframe doesn't work</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function runTest() {
+    var iframe = document.createElement("iframe");
+    iframe.src = "https://example.com/tests/dom/serviceworkers/test/register_https.html";
+    document.body.appendChild(iframe);
+
+    window.onmessage = event => {
+      switch (event.data.type) {
+      case "ok":
+        ok(event.data.status, event.data.msg);
+        break;
+      case "done":
+        SimpleTest.finish();
+        break;
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_sandbox_intercept.html b/dom/serviceworkers/test/test_sandbox_intercept.html
new file mode 100644
index 0000000000..2aa120994f
--- /dev/null
+++ b/dom/serviceworkers/test/test_sandbox_intercept.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1142727 - Test that sandboxed iframes are not intercepted</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<iframe id="normal-frame"></iframe>
+<iframe sandbox="allow-scripts" id="sandbox-frame"></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var normalFrame;
+  var sandboxFrame;
+  function runTest() {
+    normalFrame = document.getElementById("normal-frame");
+    sandboxFrame = document.getElementById("sandbox-frame");
+    normalFrame.src = "/tests/dom/serviceworkers/test/fetch/sandbox/register.html";
+    window.onmessage = function(e) {
+      if (e.data.status == "ok") {
+        ok(e.data.result, e.data.message);
+      } else if (e.data.status == "registrationdone") {
+        normalFrame.src = "about:blank";
+        sandboxFrame.src = "/tests/dom/serviceworkers/test/fetch/sandbox/index.html";
+      } else if (e.data.status == "done") {
+        sandboxFrame.src = "about:blank";
+        normalFrame.src = "/tests/dom/serviceworkers/test/fetch/sandbox/unregister.html";
+      } else if (e.data.status == "unregistrationdone") {
+        normalFrame.src = "about:blank";
+        window.onmessage = null;
+        ok(true, "Test finished successfully");
+        SimpleTest.finish();
+      }
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_sanitize.html b/dom/serviceworkers/test/test_sanitize.html
new file mode 100644
index 0000000000..dd6bd42c8f
--- /dev/null
+++ b/dom/serviceworkers/test/test_sanitize.html
@@ -0,0 +1,86 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1080109 - Clear ServiceWorker registrations for all domains</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function start() {
+    const Cc = SpecialPowers.Cc;
+    const Ci = SpecialPowers.Ci;
+
+    function testNotIntercepted() {
+      testFrame("sanitize/frame.html").then(function(body) {
+        is(body, "FAIL", "Expected frame to not be controlled");
+        // No need to unregister since that already happened.
+        navigator.serviceWorker.getRegistration("sanitize/foo").then(function(reg) {
+          ok(reg === undefined, "There should no longer be a valid registration");
+        }, function(e) {
+          ok(false, "getRegistration() should not error");
+        }).then(function(e) {
+          SimpleTest.finish();
+        });
+      });
+    }
+
+    registerSW().then(function() {
+      return testFrame("sanitize/frame.html").then(function(body) {
+        is(body, "intercepted", "Expected serviceworker to intercept request");
+      });
+    }).then(function() {
+      return navigator.serviceWorker.getRegistration("sanitize/foo");
+    }).then(function(reg) {
+      reg.active.onstatechange = function(e) {
+        e.target.onstatechange = null;
+        is(e.target.state, "redundant", "On clearing data, serviceworker should become redundant");
+        testNotIntercepted();
+      };
+    }).then(function() {
+      SpecialPowers.removeAllServiceWorkerData();
+    });
+  }
+
+  function testFrame(src) {
+    return new Promise(function(resolve, reject) {
+      var iframe = document.createElement("iframe");
+      iframe.src = src;
+      window.onmessage = function(message) {
+        window.onmessage = null;
+        iframe.src = "about:blank";
+        document.body.removeChild(iframe);
+        iframe = null;
+        SpecialPowers.exactGC(function() {
+          resolve(message.data);
+        });
+      };
+      document.body.appendChild(iframe);
+    });
+  }
+
+  function registerSW() {
+    return testFrame("sanitize/register.html");
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, function() {
+    start();
+  });
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_sanitize_domain.html b/dom/serviceworkers/test/test_sanitize_domain.html
new file mode 100644
index 0000000000..d0f5f7f69a
--- /dev/null
+++ b/dom/serviceworkers/test/test_sanitize_domain.html
@@ -0,0 +1,89 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1080109 - Clear ServiceWorker registrations for specific domains</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function start() {
+    const Cc = SpecialPowers.Cc;
+    const Ci = SpecialPowers.Ci;
+
+    function checkDomainRegistration(domain, exists) {
+      return testFrame("http://" + domain + "/tests/dom/serviceworkers/test/sanitize/example_check_and_unregister.html").then(function(body) {
+        if (body === "FAIL") {
+          ok(false, "Error acquiring registration or unregistering for " + domain);
+        } else {
+          if (exists) {
+            ok(body === true, "Expected " + domain + " to still have a registration.");
+          } else {
+            ok(body === false, "Expected " + domain + " to have no registration.");
+          }
+        }
+      });
+    }
+
+    registerSW().then(function() {
+      return testFrame("http://example.com/tests/dom/serviceworkers/test/sanitize/frame.html").then(function(body) {
+        is(body, "intercepted", "Expected serviceworker to intercept request");
+      });
+    }).then(function() {
+      return SpecialPowers.removeServiceWorkerDataForExampleDomain();
+    }).then(function() {
+      return checkDomainRegistration("prefixexample.com", true /* exists */)
+        .then(function(e) {
+          return checkDomainRegistration("example.com", false /* exists */);
+        }).then(function(e) {
+          SimpleTest.finish();
+        });
+    })
+  }
+
+  function testFrame(src) {
+    return new Promise(function(resolve, reject) {
+      var iframe = document.createElement("iframe");
+      iframe.src = src;
+      window.onmessage = function(message) {
+        window.onmessage = null;
+        iframe.src = "about:blank";
+        document.body.removeChild(iframe);
+        iframe = null;
+        SpecialPowers.exactGC(function() {
+          resolve(message.data);
+        });
+      };
+      document.body.appendChild(iframe);
+    });
+  }
+
+  function registerSW() {
+    return testFrame("http://example.com/tests/dom/serviceworkers/test/sanitize/register.html")
+           .then(function(e) {
+              // Register for prefixexample.com and then ensure it does not get unregistered.
+              return testFrame("http://prefixexample.com/tests/dom/serviceworkers/test/sanitize/register.html");
+            });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, function() {
+    start();
+  });
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_scopes.html b/dom/serviceworkers/test/test_scopes.html
new file mode 100644
index 0000000000..77e997766d
--- /dev/null
+++ b/dom/serviceworkers/test/test_scopes.html
@@ -0,0 +1,143 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 984048 - Test scope glob matching.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var scriptsAndScopes = [
+    [ "worker.js", "./sub/dir/"],
+    [ "worker.js", "./sub/dir" ],
+    [ "worker.js", "./sub/dir.html" ],
+    [ "worker.js", "./sub/dir/a" ],
+    [ "worker.js", "./sub" ],
+    [ "worker.js", "./star*" ], // '*' has no special meaning
+  ];
+
+  function registerWorkers() {
+    var registerArray = [];
+    scriptsAndScopes.forEach(function(item) {
+      registerArray.push(navigator.serviceWorker.register(item[0], { scope: item[1] }));
+    });
+
+    // Check register()'s step 4 which uses script's url with "./" as the scope if no scope is passed.
+    // The other tests already check step 5.
+    registerArray.push(navigator.serviceWorker.register("scope/scope_worker.js"));
+
+    // Check that SW cannot be registered for a scope "above" the script's location.
+    registerArray.push(new Promise(function(resolve, reject) {
+      navigator.serviceWorker.register("scope/scope_worker.js", { scope: "./" })
+        .then(function() {
+          ok(false, "registration scope has to be inside service worker script scope.");
+          reject();
+        }, function() {
+          ok(true, "registration scope has to be inside service worker script scope.");
+          resolve();
+        });
+    }));
+    return Promise.all(registerArray);
+  }
+
+  function unregisterWorkers() {
+    var unregisterArray = [];
+    scriptsAndScopes.forEach(function(item) {
+      var p = navigator.serviceWorker.getRegistration(item[1]);
+      unregisterArray.push(p.then(function(reg) {
+        return reg.unregister();
+      }));
+    });
+
+    unregisterArray.push(navigator.serviceWorker.getRegistration("scope/").then(function (reg) {
+      return reg.unregister();
+    }));
+
+    return Promise.all(unregisterArray);
+  }
+
+  async function testScopes() {
+    function chromeScriptSource() {
+      /* eslint-env mozilla/chrome-script */
+
+      let swm = Cc["@mozilla.org/serviceworkers/manager;1"]
+                  .getService(Ci.nsIServiceWorkerManager);
+      let secMan = Cc["@mozilla.org/scriptsecuritymanager;1"]
+                     .getService(Ci.nsIScriptSecurityManager);
+      addMessageListener("getScope", (msg) => {
+        let principal = secMan.createContentPrincipalFromOrigin(msg.principal);
+        try {
+          return { scope: swm.getScopeForUrl(principal, msg.path) };
+        } catch (e) {
+          return { exception: e.message };
+        }
+      });
+    }
+
+    let chromeScript = SpecialPowers.loadChromeScript(chromeScriptSource);
+    let docPrincipal = SpecialPowers.wrap(document).nodePrincipal.spec;
+
+    getScope = async (path) => {
+      let rv = await chromeScript.sendQuery("getScope", { principal: docPrincipal, path });
+      if (rv.exception)
+        throw rv.exception;
+      return rv.scope;
+    };
+
+    var base = new URL(".", document.baseURI);
+
+    function p(s) {
+      return base + s;
+    }
+
+    async function fail(fn) {
+      try {
+        await getScope(p("index.html"));
+        ok(false, "No registration");
+      } catch(e) {
+        ok(true, "No registration");
+      }
+    }
+
+    is(await getScope(p("sub.html")), p("sub"), "Scope should match");
+    is(await getScope(p("sub/dir.html")), p("sub/dir.html"), "Scope should match");
+    is(await getScope(p("sub/dir")), p("sub/dir"), "Scope should match");
+    is(await getScope(p("sub/dir/foo")), p("sub/dir/"), "Scope should match");
+    is(await getScope(p("sub/dir/afoo")), p("sub/dir/a"), "Scope should match");
+    is(await getScope(p("star*wars")), p("star*"), "Scope should match");
+    is(await getScope(p("scope/some_file.html")), p("scope/"), "Scope should match");
+    await fail("index.html");
+    await fail("sua.html");
+    await fail("star/a.html");
+  }
+
+  function runTest() {
+    registerWorkers()
+      .then(testScopes)
+      .then(unregisterWorkers)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_script_loader_intercepted_js_cache.html b/dom/serviceworkers/test/test_script_loader_intercepted_js_cache.html
new file mode 100644
index 0000000000..d0073705bb
--- /dev/null
+++ b/dom/serviceworkers/test/test_script_loader_intercepted_js_cache.html
@@ -0,0 +1,224 @@
+<!DOCTYPE html>
+<html>
+<!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1350359 -->
+<!-- The JS bytecode cache is not supposed to be observable. To make it
+     observable, the ScriptLoader is instrumented to trigger events on the
+     script tag. These events are followed to reconstruct the code path taken by
+     the script loader and associate a simple name which is checked in these
+     test cases.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for saving and loading bytecode in/from the necko cache</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="utils.js"></script>
+  <script type="application/javascript">
+
+    // This is the state machine of the trace events produced by the
+    // ScriptLoader. This state machine is used to give a name to each
+    // code path, such that we can assert each code path with a single word.
+    var scriptLoaderStateMachine = {
+      "scriptloader_load_source": {
+        "scriptloader_execute": {
+          "scriptloader_encode": {
+            "scriptloader_bytecode_saved": "bytecode_saved",
+            "scriptloader_bytecode_failed": "bytecode_failed"
+          },
+          "scriptloader_no_encode": "source_exec"
+        }
+      },
+      "scriptloader_load_bytecode": {
+        "scriptloader_fallback": {
+          // Replicate the top-level state machine without
+          // "scriptloader_load_bytecode" transition.
+          "scriptloader_load_source": {
+            "scriptloader_execute": {
+              "scriptloader_encode": {
+                "scriptloader_bytecode_saved": "fallback_bytecode_saved",
+                "scriptloader_bytecode_failed": "fallback_bytecode_failed"
+              },
+              "scriptloader_no_encode": "fallback_source_exec"
+            }
+          }
+        },
+        "scriptloader_execute": "bytecode_exec"
+      }
+    };
+
+    var gScript = SpecialPowers.
+      loadChromeScript('http://mochi.test:8888/tests/dom/serviceworkers/test/file_js_cache_cleanup.js');
+
+    function WaitForScriptTagEvent(url) {
+      var iframe = document.createElement("iframe");
+      document.body.appendChild(iframe);
+
+      var stateMachine = scriptLoaderStateMachine;
+      var stateHistory = [];
+      var stateMachineResolve, stateMachineReject;
+      var statePromise = new Promise((resolve, reject) => {
+        stateMachineResolve = resolve;
+        stateMachineReject = reject;
+      });
+      var ping = 0;
+
+      // Walk the script loader state machine with the emitted events.
+      function log_event(evt) {
+        // If we have multiple script tags in the loaded source, make sure
+        // we only watch a single one.
+        if (evt.target.id != "watchme")
+          return;
+
+        dump("## ScriptLoader event: " + evt.type + "\n");
+        stateHistory.push(evt.type)
+        if (typeof stateMachine == "object")
+          stateMachine = stateMachine[evt.type];
+        if (typeof stateMachine == "string") {
+          // We arrived to a final state, report the name of it.
+          var result = stateMachine;
+          if (ping) {
+            result = `${result} & ping(=${ping})`;
+          }
+          stateMachineResolve(result);
+        } else if (stateMachine === undefined) {
+          // We followed an unknown transition, report the known history.
+          stateMachineReject(stateHistory);
+        }
+      }
+
+        var iwin = iframe.contentWindow;
+      iwin.addEventListener("scriptloader_load_source", log_event);
+      iwin.addEventListener("scriptloader_load_bytecode", log_event);
+      iwin.addEventListener("scriptloader_generate_bytecode", log_event);
+      iwin.addEventListener("scriptloader_execute", log_event);
+      iwin.addEventListener("scriptloader_encode", log_event);
+      iwin.addEventListener("scriptloader_no_encode", log_event);
+      iwin.addEventListener("scriptloader_bytecode_saved", log_event);
+      iwin.addEventListener("scriptloader_bytecode_failed", log_event);
+      iwin.addEventListener("scriptloader_fallback", log_event);
+      iwin.addEventListener("ping", (evt) => {
+        ping += 1;
+        dump(`## Content event: ${evt.type} (=${ping})\n`);
+      });
+      iframe.src = url;
+
+      statePromise.then(() => {
+        document.body.removeChild(iframe);
+      });
+      return statePromise;
+    }
+
+    promise_test(async function() {
+      // Setting dom.expose_test_interfaces pref causes the
+      // nsScriptLoadRequest to fire event on script tags, with information
+      // about its internal state. The ScriptLoader source send events to
+      // trace these and resolve a promise with the path taken by the
+      // script loader.
+      //
+      // Setting dom.script_loader.bytecode_cache.strategy to -1 causes the
+      // nsScriptLoadRequest to force all the conditions necessary to make a
+      // script be saved as bytecode in the alternate data storage provided
+      // by the channel (necko cache).
+      await SpecialPowers.pushPrefEnv({set: [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.testing.enabled", true],
+        ['dom.script_loader.bytecode_cache.enabled', true],
+        ['dom.expose_test_interfaces', true],
+        ['dom.script_loader.bytecode_cache.strategy', -1]
+      ]});
+
+      // Register the service worker that perform the pass-through fetch.
+      var registration = await navigator.serviceWorker
+                                        .register("fetch.js", {scope: "./"});
+      let sw = registration.installing || registration.active;
+
+      // wait for service worker be activated
+      await waitForState(sw, 'activated');
+
+      await testCheckTheJSBytecodeCache();
+      await testSavebytecodeAfterTheInitializationOfThePage();
+      await testDoNotSaveBytecodeOnCompilationErrors();
+
+      await registration.unregister();
+      await teardown();
+    });
+
+    function teardown() {
+      return new Promise((resolve, reject) => {
+        gScript.addMessageListener("teardown-complete", function teardownCompleteHandler() {
+          gScript.removeMessageListener("teardown-complete", teardownCompleteHandler);
+          gScript.destroy();
+          resolve();
+        });
+        gScript.sendAsyncMessage("teardown");
+      });
+    }
+
+    async function testCheckTheJSBytecodeCache() {
+      dump("## Test: Check the JS bytecode cache\n");
+
+      // Load the test page, and verify that the code path taken by the
+      // nsScriptLoadRequest corresponds to the code path which is loading a
+      // source and saving it as bytecode.
+      var stateMachineResult = WaitForScriptTagEvent("file_js_cache.html");
+      assert_equals(await stateMachineResult, "bytecode_saved",
+                    "[1] ScriptLoadRequest status after the first visit");
+
+      // Reload the same test page, and verify that the code path taken by
+      // the nsScriptLoadRequest corresponds to the code path which is
+      // loading bytecode and executing it.
+      stateMachineResult = WaitForScriptTagEvent("file_js_cache.html");
+      assert_equals(await stateMachineResult, "bytecode_exec",
+                    "[2] ScriptLoadRequest status after the second visit");
+
+      // Load another page which loads the same script with an SRI, while
+      // the cached bytecode does not have any. This should fallback to
+      // loading the source before saving the bytecode once more.
+      stateMachineResult = WaitForScriptTagEvent("file_js_cache_with_sri.html");
+      assert_equals(await stateMachineResult, "fallback_bytecode_saved",
+                    "[3] ScriptLoadRequest status after the SRI hash");
+
+      // Loading a page, which has the same SRI should verify the SRI and
+      // continue by executing the bytecode.
+      var stateMachineResult1 = WaitForScriptTagEvent("file_js_cache_with_sri.html");
+
+      // Loading a page which does not have a SRI while we have one in the
+      // cache should not change anything. We should also be able to load
+      // the cache simultanesouly.
+      var stateMachineResult2 = WaitForScriptTagEvent("file_js_cache.html");
+
+      assert_equals(await stateMachineResult1, "bytecode_exec",
+                    "[4] ScriptLoadRequest status after same SRI hash");
+      assert_equals(await stateMachineResult2, "bytecode_exec",
+                    "[5] ScriptLoadRequest status after visit with no SRI");
+    }
+
+    async function testSavebytecodeAfterTheInitializationOfThePage() {
+      dump("## Test: Save bytecode after the initialization of the page");
+
+      // The test page add a new script which generate a "ping" event, which
+      // should be recorded before the bytecode is stored in the cache.
+      var stateMachineResult =
+          WaitForScriptTagEvent("file_js_cache_save_after_load.html");
+      assert_equals(await stateMachineResult, "bytecode_saved & ping(=3)",
+                    "Wait on all scripts to be executed");
+    }
+
+    async function testDoNotSaveBytecodeOnCompilationErrors() {
+      dump("## Test: Do not save bytecode on compilation errors");
+
+      // The test page loads a script which contains a syntax error, we should
+      // not attempt to encode any bytecode for it.
+      var stateMachineResult =
+          WaitForScriptTagEvent("file_js_cache_syntax_error.html");
+      assert_equals(await stateMachineResult, "source_exec",
+                    "Check the lack of bytecode encoding");
+    }
+
+  done();
+  </script>
+</head>
+<body>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1350359">Mozilla Bug 1350359</a>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_self_update_worker.html b/dom/serviceworkers/test/test_self_update_worker.html
new file mode 100644
index 0000000000..d6d4544dd9
--- /dev/null
+++ b/dom/serviceworkers/test/test_self_update_worker.html
@@ -0,0 +1,136 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test that a self updating service worker can't keep running forever when the
+  script changes.
+
+  - self_update_worker.sjs is a stateful server-side js script that returns a
+  SW script with a different version every time it's invoked. (version=1..n)
+  - The SW script will trigger an update when it reaches the activating state,
+  which, if not for the update delaying mechanism, would result in an iterative
+  cycle.
+  - We currently delay registration.update() calls originating from SWs not currently
+  controlling any clients. The delay is: 0s, 30s, 900s etc, but for the purpose of
+  this test, the delay is: 0s, infinite etc.
+  - We assert that the SW script never reaches version 3, meaning it will only
+  successfully update once.
+  - We give the worker reasonable time to self update by repeatedly registering
+  and unregistering an empty service worker.
+  -->
+<head>
+  <title>Test for Bug 1432846</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1432846">Mozilla Bug 1432846</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+function activateDummyWorker() {
+  return navigator.serviceWorker.register("empty.js",
+    { scope: "./empty?random=" + Date.now() })
+    .then(function(registration) {
+      var worker = registration.installing;
+      return waitForState(worker, 'activated', registration).then(function() {
+        ok(true, "got dummy!");
+        return registration.unregister();
+      });
+    });
+}
+
+add_task(async function test_update() {
+  navigator.serviceWorker.onmessage = function(event) {
+    ok (event.data.version < 3, "Service worker updated too many times." + event.data.version);
+  }
+
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.update_delay", 30000],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999]]});
+
+  // clear version counter
+  await fetch("self_update_worker.sjs?clearcounter");
+
+  var worker;
+  let registration = await navigator.serviceWorker.register(
+    "self_update_worker.sjs",
+    { scope: "./test_self_update_worker.html?random=" + Date.now()})
+    .then(function(reg) {
+      worker = reg.installing;
+      // We can't wait for 'activated' here, since it's possible for
+      // the update process to kill the worker before it activates.
+      // See: https://github.com/w3c/ServiceWorker/issues/1285
+      return waitForState(worker, 'activating', reg);
+    });
+
+  // We need to wait a reasonable time to give the self updating worker a chance
+  // to change to a newer version. Register and activate an empty worker 5 times.
+  for (i = 0; i < 5; i++) {
+    await activateDummyWorker();
+  }
+
+
+  await registration.unregister();
+  await SpecialPowers.popPrefEnv();
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test variant to ensure that we properly keep the timer alive by having a
+// non-zero but small timer duration. In this case, the delay is simply our
+// exponential growth rate of 30, so if we end up getting to version 4, that's
+// okay and the test may need to be updated.
+add_task(async function test_delay_update() {
+  let version;
+  navigator.serviceWorker.onmessage = function(event) {
+    ok (event.data.version <= 3, "Service worker updated too many times." + event.data.version);
+    version = event.data.version;
+  }
+
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.update_delay", 1],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999]]});
+
+  // clear version counter
+  await fetch("self_update_worker.sjs?clearcounter");
+
+  var worker;
+  let registration = await navigator.serviceWorker.register(
+    "self_update_worker.sjs",
+    { scope: "./test_self_update_worker.html?random=" + Date.now()})
+    .then(function(reg) {
+      worker = reg.installing;
+      // We can't wait for 'activated' here, since it's possible for
+      // the update process to kill the worker before it activates.
+      // See: https://github.com/w3c/ServiceWorker/issues/1285
+      return waitForState(worker, 'activating', reg);
+    });
+
+  // We need to wait a reasonable time to give the self updating worker a chance
+  // to change to a newer version. Register and activate an empty worker 5 times.
+  for (i = 0; i < 5; i++) {
+    await activateDummyWorker();
+  }
+
+  is(version, 3, "Service worker version should be 3.");
+
+  await registration.unregister();
+  await SpecialPowers.popPrefEnv();
+  await SpecialPowers.popPrefEnv();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_service_worker_allowed.html b/dom/serviceworkers/test/test_service_worker_allowed.html
new file mode 100644
index 0000000000..a74379f383
--- /dev/null
+++ b/dom/serviceworkers/test/test_service_worker_allowed.html
@@ -0,0 +1,74 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the Service-Worker-Allowed header</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<div id="content"></div>
+<script class="testbody" type="text/javascript">
+  var gTests = [
+    "worker_scope_different.js",
+    "worker_scope_different2.js",
+    "worker_scope_too_deep.js",
+  ];
+
+  function testPermissiveHeader() {
+    // Make sure that this registration succeeds, as the prefix check should pass.
+    return navigator.serviceWorker.register("swa/worker_scope_too_narrow.js", {scope: "swa/"})
+      .then(swr => {
+        ok(true, "Registration should finish successfully");
+        return swr.unregister();
+      }, err => {
+        ok(false, "Unexpected error when registering the service worker: " + err);
+      });
+  }
+
+  function testPreciseHeader() {
+    // Make sure that this registration succeeds, as the prefix check should pass
+    // given that we parse the use the full pathname from this URL..
+    return navigator.serviceWorker.register("swa/worker_scope_precise.js", {scope: "swa/"})
+      .then(swr => {
+        ok(true, "Registration should finish successfully");
+        return swr.unregister();
+      }, err => {
+        ok(false, "Unexpected error when registering the service worker: " + err);
+      });
+  }
+
+  function runTest() {
+    Promise.all(gTests.map(testName => {
+      return new Promise((resolve, reject) => {
+        // Make sure that registration fails.
+        navigator.serviceWorker.register("swa/" + testName, {scope: "swa/"})
+          .then(reject, resolve);
+      });
+    })).then(values => {
+      values.forEach(error => {
+        is(error.name, "SecurityError", "Registration should fail");
+      });
+      Promise.all([
+          testPermissiveHeader(),
+          testPreciseHeader(),
+      ]).then(SimpleTest.finish, SimpleTest.finish);
+    }, (x) => {
+      ok(false, "Registration should not succeed, but it did");
+      SimpleTest.finish();
+    });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_serviceworker.html b/dom/serviceworkers/test/test_serviceworker.html
new file mode 100644
index 0000000000..bfc5749405
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworker.html
@@ -0,0 +1,79 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1137245 - Allow IndexedDB usage in ServiceWorkers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+
+  var regisration;
+  function simpleRegister() {
+    return navigator.serviceWorker.register("service_worker.js", {
+      scope: 'service_worker_client.html'
+    }).then(swr => waitForState(swr.installing, 'activated', swr));
+  }
+
+  function unregister() {
+    return registration.unregister();
+  }
+
+  function testIndexedDBAvailable(sw) {
+    registration = sw;
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data === "READY") {
+          sw.active.postMessage("GO");
+          return;
+        }
+
+        if (!("available" in e.data)) {
+          ok(false, "Something went wrong");
+          reject();
+          return;
+        }
+
+        ok(e.data.available, "IndexedDB available in service worker.");
+        resolve();
+      }
+    });
+
+    var content = document.getElementById("content");
+    ok(content, "Parent exists.");
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute('src', "service_worker_client.html");
+    content.appendChild(iframe);
+
+    return p.then(() => content.removeChild(iframe));
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(testIndexedDBAvailable)
+      .then(unregister)
+      .then(SimpleTest.finish)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_serviceworker_header.html b/dom/serviceworkers/test/test_serviceworker_header.html
new file mode 100644
index 0000000000..f607aeba3d
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworker_header.html
@@ -0,0 +1,41 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that service worker scripts are fetched with a Service-Worker: script header</title>
+  <script type="text/javascript" src="http://mochi.test:8888/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="http://mochi.test:8888/tests/SimpleTest/test.css" />
+  <base href="https://mozilla.org/">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function runTest() {
+    navigator.serviceWorker.register("http://mochi.test:8888/tests/dom/serviceworkers/test/header_checker.sjs")
+      .then(reg => {
+        ok(true, "Register should succeed");
+        reg.unregister().then(() => SimpleTest.finish());
+      }, err => {
+        ok(false, "Register should not fail");
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      ["dom.serviceWorkers.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_serviceworker_interfaces.html b/dom/serviceworkers/test/test_serviceworker_interfaces.html
new file mode 100644
index 0000000000..8a62950bde
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworker_interfaces.html
@@ -0,0 +1,100 @@
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Validate Interfaces Exposed to Service Workers</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="../worker_driver.js"></script>
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+  function setupSW(registration) {
+    var iframe;
+    var worker = registration.installing ||
+                 registration.waiting ||
+                 registration.active;
+    window.onmessage = function(event) {
+      if (event.data.type == 'finish') {
+        iframe.remove();
+        registration.unregister().then(function(success) {
+          ok(success, "The service worker should be unregistered successfully");
+
+          SimpleTest.finish();
+        }, function(e) {
+          dump("Unregistering the SW failed with " + e + "\n");
+          SimpleTest.finish();
+        });
+      } else if (event.data.type == 'status') {
+        ok(event.data.status, event.data.msg);
+
+      } else if (event.data.type == 'getPrefs') {
+        let result = {};
+        event.data.prefs.forEach(function(pref) {
+          result[pref] = SpecialPowers.Services.prefs.getBoolPref(pref);
+        });
+        worker.postMessage({
+          type: 'returnPrefs',
+          prefs: event.data.prefs,
+          result
+        });
+
+      } else if (event.data.type == 'getHelperData') {
+        const { AppConstants } = SpecialPowers.ChromeUtils.importESModule(
+          "resource://gre/modules/AppConstants.sys.mjs"
+        );
+        const isNightly = AppConstants.NIGHTLY_BUILD;
+        const isEarlyBetaOrEarlier = AppConstants.EARLY_BETA_OR_EARLIER;
+        const isRelease = AppConstants.RELEASE_OR_BETA;
+        const isDesktop = !/Mobile|Tablet/.test(navigator.userAgent);
+        const isMac = AppConstants.platform == "macosx";
+        const isWindows = AppConstants.platform == "win";
+        const isAndroid = AppConstants.platform == "android";
+        const isLinux = AppConstants.platform == "linux";
+        const isInsecureContext = !window.isSecureContext;
+        // Currently, MOZ_APP_NAME is always "fennec" for all mobile builds, so we can't use AppConstants for this
+        const isFennec = isAndroid && SpecialPowers.Cc["@mozilla.org/android/bridge;1"].getService(SpecialPowers.Ci.nsIAndroidBridge).isFennec;
+
+        const result = {
+          isNightly, isEarlyBetaOrEarlier, isRelease, isDesktop, isMac,
+          isWindows, isAndroid, isLinux, isInsecureContext, isFennec
+        };
+
+        worker.postMessage({
+          type: 'returnHelperData', result
+        });
+      }
+    }
+
+    worker.onerror = function(event) {
+      ok(false, 'Worker had an error: ' + event.data);
+      SimpleTest.finish();
+    };
+
+    iframe = document.createElement("iframe");
+    iframe.src = "message_receiver.html";
+    iframe.onload = function() {
+      worker.postMessage({ script: "test_serviceworker_interfaces.js" });
+    };
+    document.body.appendChild(iframe);
+  }
+
+  function runTest() {
+    navigator.serviceWorker.register("serviceworker_wrapper.js", {scope: "."})
+      .then(setupSW);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    var prefs = [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ];
+    SpecialPowers.pushPrefEnv({"set": prefs}, runTest);
+  };
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_serviceworker_interfaces.js b/dom/serviceworkers/test/test_serviceworker_interfaces.js
new file mode 100644
index 0000000000..1cf0896edf
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworker_interfaces.js
@@ -0,0 +1,567 @@
+// This is a list of all interfaces that are exposed to workers.
+// Please only add things to this list with great care and proper review
+// from the associated module peers.
+
+// This file lists global interfaces we want exposed and verifies they
+// are what we intend. Each entry in the arrays below can either be a
+// simple string with the interface name, or an object with a 'name'
+// property giving the interface name as a string, and additional
+// properties which qualify the exposure of that interface. For example:
+//
+// [
+//   "AGlobalInterface",
+//   { name: "ExperimentalThing", release: false },
+//   { name: "ReallyExperimentalThing", nightly: true },
+//   { name: "DesktopOnlyThing", desktop: true },
+//   { name: "FancyControl", xbl: true },
+//   { name: "DisabledEverywhere", disabled: true },
+// ];
+//
+// See createInterfaceMap() below for a complete list of properties.
+
+// IMPORTANT: Do not change this list without review from
+//            a JavaScript Engine peer!
+let wasmGlobalEntry = {
+  name: "WebAssembly",
+  insecureContext: true,
+  disabled: !getJSTestingFunctions().wasmIsSupportedByHardware(),
+};
+let wasmGlobalInterfaces = [
+  { name: "Module", insecureContext: true },
+  { name: "Instance", insecureContext: true },
+  { name: "Memory", insecureContext: true },
+  { name: "Table", insecureContext: true },
+  { name: "Global", insecureContext: true },
+  { name: "CompileError", insecureContext: true },
+  { name: "LinkError", insecureContext: true },
+  { name: "RuntimeError", insecureContext: true },
+  { name: "Function", insecureContext: true, nightly: true },
+  { name: "Exception", insecureContext: true },
+  { name: "Tag", insecureContext: true },
+  { name: "compile", insecureContext: true },
+  { name: "compileStreaming", insecureContext: true },
+  { name: "instantiate", insecureContext: true },
+  { name: "instantiateStreaming", insecureContext: true },
+  { name: "validate", insecureContext: true },
+];
+// IMPORTANT: Do not change this list without review from
+//            a JavaScript Engine peer!
+let ecmaGlobals = [
+  "AggregateError",
+  "Array",
+  "ArrayBuffer",
+  "Atomics",
+  "Boolean",
+  "BigInt",
+  "BigInt64Array",
+  "BigUint64Array",
+  "DataView",
+  "Date",
+  "Error",
+  "EvalError",
+  "FinalizationRegistry",
+  "Float32Array",
+  "Float64Array",
+  "Function",
+  "Infinity",
+  "Int16Array",
+  "Int32Array",
+  "Int8Array",
+  "InternalError",
+  "Intl",
+  "JSON",
+  "Map",
+  "Math",
+  "NaN",
+  "Number",
+  "Object",
+  "Promise",
+  "Proxy",
+  "RangeError",
+  "ReferenceError",
+  "Reflect",
+  "RegExp",
+  "Set",
+  {
+    name: "SharedArrayBuffer",
+    crossOriginIsolated: true,
+  },
+  "String",
+  "Symbol",
+  "SyntaxError",
+  "TypeError",
+  "Uint16Array",
+  "Uint32Array",
+  "Uint8Array",
+  "Uint8ClampedArray",
+  "URIError",
+  "WeakMap",
+  "WeakRef",
+  "WeakSet",
+  wasmGlobalEntry,
+  "decodeURI",
+  "decodeURIComponent",
+  "encodeURI",
+  "encodeURIComponent",
+  "escape",
+  "eval",
+  "globalThis",
+  "isFinite",
+  "isNaN",
+  "parseFloat",
+  "parseInt",
+  "undefined",
+  "unescape",
+];
+// IMPORTANT: Do not change the list above without review from
+//            a JavaScript Engine peer!
+
+// IMPORTANT: Do not change the list below without review from a DOM peer!
+let interfaceNamesInGlobalScope = [
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "AbortController",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "AbortSignal",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Blob",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "BroadcastChannel",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ByteLengthQueuingStrategy",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Cache",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CacheStorage",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CanvasGradient",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CanvasPattern",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Client",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Clients",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CloseEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CompressionStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CountQueuingStrategy",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Crypto",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CryptoKey",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "CustomEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DecompressionStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Directory",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMException",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMMatrix",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMMatrixReadOnly",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMPoint",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMPointReadOnly",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMQuad",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMRect",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMRectReadOnly",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "DOMRequest", disabled: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "DOMStringList",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ErrorEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Event",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "EventTarget",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ExtendableEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ExtendableMessageEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FetchEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "File",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FileList",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FileReader",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "FileSystemDirectoryHandle" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "FileSystemFileHandle" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "FileSystemHandle" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "FileSystemWritableFileStream" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FontFace",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FontFaceSet",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FontFaceSetLoadEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "FormData",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Headers",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBCursor",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBCursorWithValue",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBDatabase",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBFactory",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBIndex",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBKeyRange",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBObjectStore",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBOpenDBRequest",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBRequest",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBTransaction",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "IDBVersionChangeEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ImageBitmap",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ImageBitmapRenderingContext",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ImageData",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Lock",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "LockManager",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "MediaCapabilities",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "MediaCapabilitiesInfo",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "MessageChannel",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "MessageEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "MessagePort",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "NetworkInformation", disabled: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "NavigationPreloadManager",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Notification",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "NotificationEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "OffscreenCanvas",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "OffscreenCanvasRenderingContext2D",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Path2D",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Performance",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceEntry",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceMark",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceMeasure",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceObserver",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceObserverEntryList",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceResourceTiming",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PerformanceServerTiming",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ProgressEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "PromiseRejectionEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "PushEvent" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "PushManager" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "PushMessageData" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "PushSubscription" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "PushSubscriptionOptions" },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableByteStreamController",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableStreamBYOBReader",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableStreamBYOBRequest",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableStreamDefaultController",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ReadableStreamDefaultReader",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Request",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "Response",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "Scheduler", nightly: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ServiceWorker",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ServiceWorkerGlobalScope",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "ServiceWorkerRegistration",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "StorageManager", fennec: false },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "SubtleCrypto",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "TaskController", nightly: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "TaskPriorityChangeEvent", nightly: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "TaskSignal", nightly: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TextDecoder",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TextDecoderStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TextEncoder",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TextEncoderStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TextMetrics",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TransformStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "TransformStreamDefaultController",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "URL",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "URLSearchParams",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebSocket",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransport",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransportBidirectionalStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransportDatagramDuplexStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransportError",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransportReceiveStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebTransportSendStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGL2RenderingContext",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLActiveInfo",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLBuffer",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLContextEvent",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLFramebuffer",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLProgram",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLQuery",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLRenderbuffer",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLRenderingContext",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLSampler",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLShader",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLShaderPrecisionFormat",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLSync",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLTexture",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLTransformFeedback",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLUniformLocation",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WebGLVertexArrayObject",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WindowClient",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WorkerGlobalScope",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WorkerLocation",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WorkerNavigator",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WritableStream",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WritableStreamDefaultController",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "WritableStreamDefaultWriter",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "clients",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "console",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onactivate",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onfetch",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "oninstall",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onmessage",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onmessageerror",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onnotificationclick",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onnotificationclose",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onpush",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "onpushsubscriptionchange",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "registration",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+  "skipWaiting",
+  // IMPORTANT: Do not change this list without review from a DOM peer!
+];
+// IMPORTANT: Do not change the list above without review from a DOM peer!
+
+// List of functions defined on the global by the test harness or this test
+// file.
+let testFunctions = [
+  "ok",
+  "is",
+  "workerTestArrayEquals",
+  "workerTestDone",
+  "workerTestGetHelperData",
+  "workerTestGetStorageManager",
+  "entryDisabled",
+  "createInterfaceMap",
+  "runTest",
+];
+
+function entryDisabled(
+  entry,
+  {
+    isNightly,
+    isEarlyBetaOrEarlier,
+    isRelease,
+    isDesktop,
+    isAndroid,
+    isInsecureContext,
+    isFennec,
+    isCrossOriginIsolated,
+  }
+) {
+  return (
+    entry.nightly === !isNightly ||
+    (entry.nightlyAndroid === !(isAndroid && isNightly) && isAndroid) ||
+    (entry.nonReleaseAndroid === !(isAndroid && !isRelease) && isAndroid) ||
+    entry.desktop === !isDesktop ||
+    (entry.android === !isAndroid &&
+      !entry.nonReleaseAndroid &&
+      !entry.nightlyAndroid) ||
+    entry.fennecOrDesktop === (isAndroid && !isFennec) ||
+    entry.fennec === !isFennec ||
+    entry.release === !isRelease ||
+    entry.earlyBetaOrEarlier === !isEarlyBetaOrEarlier ||
+    entry.crossOriginIsolated === !isCrossOriginIsolated ||
+    entry.disabled
+  );
+}
+
+function createInterfaceMap(data, ...interfaceGroups) {
+  var interfaceMap = {};
+
+  function addInterfaces(interfaces) {
+    for (var entry of interfaces) {
+      if (typeof entry === "string") {
+        ok(!(entry in interfaceMap), "duplicate entry for " + entry);
+        interfaceMap[entry] = true;
+      } else {
+        ok(!(entry.name in interfaceMap), "duplicate entry for " + entry.name);
+        ok(!("pref" in entry), "Bogus pref annotation for " + entry.name);
+        if (entryDisabled(entry, data)) {
+          interfaceMap[entry.name] = false;
+        } else if (entry.optional) {
+          interfaceMap[entry.name] = "optional";
+        } else {
+          interfaceMap[entry.name] = true;
+        }
+      }
+    }
+  }
+
+  for (let interfaceGroup of interfaceGroups) {
+    addInterfaces(interfaceGroup);
+  }
+
+  return interfaceMap;
+}
+
+function runTest(parentName, parent, data, ...interfaceGroups) {
+  var interfaceMap = createInterfaceMap(data, ...interfaceGroups);
+  for (var name of Object.getOwnPropertyNames(parent)) {
+    // Ignore functions on the global that are part of the test (harness).
+    if (parent === self && testFunctions.includes(name)) {
+      continue;
+    }
+    ok(
+      interfaceMap[name] === "optional" || interfaceMap[name],
+      "If this is failing: DANGER, are you sure you want to expose the new interface " +
+        name +
+        " to all webpages as a property on " +
+        parentName +
+        "? Do not make a change to this file without a " +
+        " review from a DOM peer for that specific change!!! (or a JS peer for changes to ecmaGlobals)"
+    );
+    delete interfaceMap[name];
+  }
+  for (var name of Object.keys(interfaceMap)) {
+    if (interfaceMap[name] === "optional") {
+      delete interfaceMap[name];
+    } else {
+      ok(
+        name in parent === interfaceMap[name],
+        name +
+          " should " +
+          (interfaceMap[name] ? "" : " NOT") +
+          " be defined on " +
+          parentName
+      );
+      if (!interfaceMap[name]) {
+        delete interfaceMap[name];
+      }
+    }
+  }
+  is(
+    Object.keys(interfaceMap).length,
+    0,
+    "The following interface(s) are not enumerated: " +
+      Object.keys(interfaceMap).join(", ")
+  );
+}
+
+workerTestGetHelperData(function (data) {
+  runTest("self", self, data, ecmaGlobals, interfaceNamesInGlobalScope);
+  if (WebAssembly && !entryDisabled(wasmGlobalEntry, data)) {
+    runTest("WebAssembly", WebAssembly, data, wasmGlobalInterfaces);
+  }
+  workerTestDone();
+});
diff --git a/dom/serviceworkers/test/test_serviceworker_not_sharedworker.html b/dom/serviceworkers/test/test_serviceworker_not_sharedworker.html
new file mode 100644
index 0000000000..33b4428e95
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworker_not_sharedworker.html
@@ -0,0 +1,66 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1141274 - test that service workers and shared workers are separate</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe></iframe>
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  var iframe;
+  const SCOPE = "http://mochi.test:8888/tests/dom/serviceworkers/test/";
+  function runTest() {
+    navigator.serviceWorker.ready.then(setupSW);
+    navigator.serviceWorker.register("serviceworker_not_sharedworker.js",
+                                     {scope: SCOPE});
+  }
+
+  var sw, worker;
+  function setupSW(registration) {
+    sw = registration.waiting || registration.active;
+    worker = new SharedWorker("serviceworker_not_sharedworker.js", SCOPE);
+    worker.port.start();
+    iframe = document.querySelector("iframe");
+    iframe.src = "message_receiver.html";
+    iframe.onload = function() {
+      window.onmessage = function(e) {
+        is(e.data.result, "serviceworker", "We should be talking to a service worker");
+        window.onmessage = null;
+        worker.port.onmessage = function(msg) {
+          is(msg.data.result, "sharedworker", "We should be talking to a shared worker");
+          registration.unregister().then(function(success) {
+            ok(success, "unregister should succeed");
+            SimpleTest.finish();
+          }, function(ex) {
+            dump("Unregistering the SW failed with " + ex + "\n");
+            SimpleTest.finish();
+          });
+        };
+        worker.port.postMessage({msg: "whoareyou"});
+      };
+      sw.postMessage({msg: "whoareyou"});
+    };
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true]
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_serviceworkerinfo.xhtml b/dom/serviceworkers/test/test_serviceworkerinfo.xhtml
new file mode 100644
index 0000000000..07b6a30345
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworkerinfo.xhtml
@@ -0,0 +1,114 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="Test for ServiceWorkerInfo"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript" src="chrome_helpers.js"/>
+  <script type="application/javascript">
+  <![CDATA[
+
+    let IFRAME_URL = EXAMPLE_URL + "serviceworkerinfo_iframe.html";
+
+    function wait_for_active_worker(registration) {
+      ok(registration, "Registration is valid.");
+      return new Promise(function(res, rej) {
+        if (registration.activeWorker) {
+          res(registration);
+          return;
+        }
+        let listener = {
+          onChange() {
+            if (registration.activeWorker) {
+              registration.removeListener(listener);
+              res(registration);
+            }
+          }
+        }
+        registration.addListener(listener);
+      });
+    }
+
+    function test() {
+      SimpleTest.waitForExplicitFinish();
+
+      SpecialPowers.pushPrefEnv({'set': [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.idle_extended_timeout", 1000000],
+        ["dom.serviceWorkers.idle_timeout", 0],
+        ["dom.serviceWorkers.testing.enabled", true],
+      ]}, function () {
+        (async function() {
+          let iframe = $("iframe");
+          let promise = new Promise(function (resolve) {
+            iframe.onload = function () {
+              resolve();
+            };
+          });
+          iframe.src = IFRAME_URL;
+          await promise;
+
+          info("Check that a service worker eventually shuts down.");
+          promise = Promise.all([
+            waitForRegister(EXAMPLE_URL),
+            waitForServiceWorkerShutdown()
+          ]);
+          iframe.contentWindow.postMessage("register", "*");
+          let [registration] = await promise;
+
+          // Make sure the worker is active.
+          registration = await wait_for_active_worker(registration);
+
+          let activeWorker = registration.activeWorker;
+          ok(activeWorker !== null, "Worker is not active!");
+          ok(activeWorker.debugger === null);
+
+          info("Attach a debugger to the service worker, and check that the " +
+               "service worker is restarted.");
+          activeWorker.attachDebugger();
+          let workerDebugger = activeWorker.debugger;
+          ok(workerDebugger !== null);
+
+          // Verify debugger properties
+          ok(workerDebugger.principal instanceof Ci.nsIPrincipal);
+          is(workerDebugger.url, EXAMPLE_URL + "worker.js");
+
+          info("Verify that getRegistrationByPrincipal return the same " +
+               "nsIServiceWorkerRegistrationInfo");
+          let reg = swm.getRegistrationByPrincipal(workerDebugger.principal,
+                                                   workerDebugger.url);
+          is(reg, registration);
+
+          info("Check that getWorkerByID returns the same nsIWorkerDebugger");
+          is(activeWorker, reg.getWorkerByID(workerDebugger.serviceWorkerID));
+
+          info("Detach the debugger from the service worker, and check that " +
+               "the service worker eventually shuts down again.");
+          promise = waitForServiceWorkerShutdown();
+          activeWorker.detachDebugger();
+          await promise;
+          ok(activeWorker.debugger === null);
+
+          promise = waitForUnregister(EXAMPLE_URL);
+          iframe.contentWindow.postMessage("unregister", "*");
+          registration = await promise;
+
+          SimpleTest.finish();
+        })();
+      });
+    }
+
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <p id="display"></p>
+    <div id="content" style="display:none;"></div>
+    <pre id="test"></pre>
+    <iframe id="iframe"></iframe>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/serviceworkers/test/test_serviceworkermanager.xhtml b/dom/serviceworkers/test/test_serviceworkermanager.xhtml
new file mode 100644
index 0000000000..5beb6c3f20
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworkermanager.xhtml
@@ -0,0 +1,79 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="Test for ServiceWorkerManager"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript" src="chrome_helpers.js"/>
+  <script type="application/javascript">
+  <![CDATA[
+
+    let IFRAME_URL = EXAMPLE_URL + "serviceworkermanager_iframe.html";
+
+    function test() {
+      SimpleTest.waitForExplicitFinish();
+
+      SpecialPowers.pushPrefEnv({'set': [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.testing.enabled", true],
+      ]}, function () {
+        (async function() {
+          let registrations = swm.getAllRegistrations();
+          is(registrations.length, 0);
+
+          let iframe = $("iframe");
+          let promise = waitForIframeLoad(iframe);
+          iframe.src = IFRAME_URL;
+          await promise;
+
+          info("Check that the service worker manager notifies its listeners " +
+               "when a service worker is registered.");
+          promise = waitForRegister(EXAMPLE_URL);
+          iframe.contentWindow.postMessage("register", "*");
+          let registration = await promise;
+
+          registrations = swm.getAllRegistrations();
+          is(registrations.length, 1);
+          is(registrations.queryElementAt(0, Ci.nsIServiceWorkerRegistrationInfo),
+             registration);
+
+          info("Check that the service worker manager does not notify its " +
+               "listeners when a service worker is registered with the same " +
+               "scope as an existing registration.");
+          let listener = {
+            onRegister () {
+              ok(false, "Listener should not have been notified.");
+            }
+          };
+          swm.addListener(listener);
+          iframe.contentWindow.postMessage("register", "*");
+
+          info("Check that the service worker manager notifies its listeners " +
+               "when a service worker is unregistered.");
+          promise = waitForUnregister(EXAMPLE_URL);
+          iframe.contentWindow.postMessage("unregister", "*");
+          registration = await promise;
+          swm.removeListener(listener);
+
+          registrations = swm.getAllRegistrations();
+          is(registrations.length, 0);
+
+          SimpleTest.finish();
+        })();
+      });
+    }
+
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <p id="display"></p>
+    <div id="content" style="display:none;"></div>
+    <pre id="test"></pre>
+    <iframe id="iframe"></iframe>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/serviceworkers/test/test_serviceworkerregistrationinfo.xhtml b/dom/serviceworkers/test/test_serviceworkerregistrationinfo.xhtml
new file mode 100644
index 0000000000..5b39350897
--- /dev/null
+++ b/dom/serviceworkers/test/test_serviceworkerregistrationinfo.xhtml
@@ -0,0 +1,155 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="Test for ServiceWorkerRegistrationInfo"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript" src="chrome_helpers.js"/>
+  <script type="application/javascript">
+  <![CDATA[
+
+    let IFRAME_URL = EXAMPLE_URL + "serviceworkerregistrationinfo_iframe.html";
+
+    function test() {
+      SimpleTest.waitForExplicitFinish();
+
+      SpecialPowers.pushPrefEnv({'set': [
+        ["dom.serviceWorkers.enabled", true],
+        ["dom.serviceWorkers.testing.enabled", true],
+      ]}, function () {
+        (async function() {
+          let iframe = $("iframe");
+          let promise = waitForIframeLoad(iframe);
+          iframe.src = IFRAME_URL;
+          await promise;
+
+          // The change handler is not guaranteed to be called within the same
+          // tick of the event loop as the one in which the change happened.
+          // Because of this, the exact state of the service worker registration
+          // is only known until the handler returns.
+          //
+          // Because then-handlers are resolved asynchronously, the following
+          // checks are done using callbacks, which are called synchronously
+          // when then handler is called. These callbacks can return a promise,
+          // which is used to resolve the promise returned by the function.
+
+          info("Check that a service worker registration notifies its " +
+               "listeners when its state changes.");
+          promise = waitForRegister(EXAMPLE_URL, function (registration) {
+            is(registration.scriptSpec, "");
+            ok(registration.installingWorker === null);
+            ok(registration.waitingWorker === null);
+            ok(registration.activeWorker === null);
+
+            return waitForServiceWorkerRegistrationChange(registration, function  () {
+              // Got change event for updating (byte-check)
+              ok(registration.installingWorker === null);
+              ok(registration.waitingWorker === null);
+              ok(registration.activeWorker === null);
+
+              return waitForServiceWorkerRegistrationChange(registration, function  () {
+                is(registration.scriptSpec, EXAMPLE_URL + "worker.js");
+                ok(registration.evaluatingWorker !== null);
+                ok(registration.installingWorker === null);
+                ok(registration.waitingWorker === null);
+                ok(registration.activeWorker === null);
+
+                return waitForServiceWorkerRegistrationChange(registration, function  () {
+                  ok(registration.installingWorker !== null);
+                  is(registration.installingWorker.scriptSpec, EXAMPLE_URL + "worker.js");
+                  ok(registration.waitingWorker === null);
+                  ok(registration.activeWorker === null);
+
+                  return waitForServiceWorkerRegistrationChange(registration, function () {
+                    ok(registration.installingWorker === null);
+                    ok(registration.waitingWorker !== null);
+                    ok(registration.activeWorker === null);
+
+                    return waitForServiceWorkerRegistrationChange(registration, function () {
+                      // Activating
+                      ok(registration.installingWorker === null);
+                      ok(registration.waitingWorker === null);
+                      ok(registration.activeWorker !== null);
+
+                      return waitForServiceWorkerRegistrationChange(registration, function () {
+                        // Activated
+                        ok(registration.installingWorker === null);
+                        ok(registration.waitingWorker === null);
+                        ok(registration.activeWorker !== null);
+
+                        return registration;
+                      });
+                    });
+                  });
+                });
+              });
+            });
+          });
+          iframe.contentWindow.postMessage("register", "*");
+          let registration = await promise;
+
+          promise = waitForServiceWorkerRegistrationChange(registration, function () {
+            // Got change event for updating (byte-check)
+            ok(registration.installingWorker === null);
+            ok(registration.waitingWorker === null);
+            ok(registration.activeWorker !== null);
+
+            return waitForServiceWorkerRegistrationChange(registration, function  () {
+              is(registration.scriptSpec, EXAMPLE_URL + "worker2.js");
+              ok(registration.evaluatingWorker !== null);
+
+              return waitForServiceWorkerRegistrationChange(registration, function () {
+                ok(registration.installingWorker !== null);
+                is(registration.installingWorker.scriptSpec, EXAMPLE_URL + "worker2.js");
+                ok(registration.waitingWorker === null);
+                ok(registration.activeWorker !== null);
+
+                return waitForServiceWorkerRegistrationChange(registration, function () {
+                  ok(registration.installingWorker === null);
+                  ok(registration.waitingWorker !== null);
+                  ok(registration.activeWorker !== null);
+
+                  return waitForServiceWorkerRegistrationChange(registration, function () {
+                    // Activating
+                    ok(registration.installingWorker === null);
+                    ok(registration.waitingWorker === null);
+                    ok(registration.activeWorker !== null);
+
+                    return waitForServiceWorkerRegistrationChange(registration, function () {
+                      // Activated
+                      ok(registration.installingWorker === null);
+                      ok(registration.waitingWorker === null);
+                      ok(registration.activeWorker !== null);
+
+                      return registration;
+                    });
+                  });
+                });
+              });
+            });
+          });
+          iframe.contentWindow.postMessage("register", "*");
+          await promise;
+
+          iframe.contentWindow.postMessage("unregister", "*");
+          await waitForUnregister(EXAMPLE_URL);
+
+          SimpleTest.finish();
+        })();
+      });
+    }
+
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <p id="display"></p>
+    <div id="content" style="display:none;"></div>
+    <pre id="test"></pre>
+    <iframe id="iframe"></iframe>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/serviceworkers/test/test_skip_waiting.html b/dom/serviceworkers/test/test_skip_waiting.html
new file mode 100644
index 0000000000..6147ad6b38
--- /dev/null
+++ b/dom/serviceworkers/test/test_skip_waiting.html
@@ -0,0 +1,86 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1131352 - Add ServiceWorkerGlobalScope skipWaiting()</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration, iframe, content;
+
+  function start() {
+    return navigator.serviceWorker.register("worker.js",
+                                            {scope: "./skip_waiting_scope/"});
+  }
+
+  async function waitForActivated(swr) {
+    registration = swr;
+    await waitForState(registration.installing, "activated")
+
+    iframe = document.createElement("iframe");
+    iframe.setAttribute("src", "skip_waiting_scope/index.html");
+
+    content = document.getElementById("content");
+    content.appendChild(iframe);
+
+    await new Promise(resolve => iframe.onload = resolve);
+  }
+
+  function checkWhetherItSkippedWaiting() {
+    var promise = new Promise(function(resolve, reject) {
+      window.onmessage = function (evt) {
+        if (evt.data.event === "controllerchange") {
+          ok(evt.data.controllerScriptURL.match("skip_waiting_installed_worker"),
+             "The controller changed after skiping the waiting step");
+          resolve();
+        } else {
+          ok(false, "Wrong value. Somenting went wrong");
+          resolve();
+        }
+      };
+    });
+
+    navigator.serviceWorker.register("skip_waiting_installed_worker.js",
+                                     {scope: "./skip_waiting_scope/"})
+      .then(swr => {
+        registration = swr;
+    });
+
+    return promise;
+  }
+
+  function clean() {
+    content.removeChild(iframe);
+
+    return registration.unregister();
+  }
+
+  function runTest() {
+    start()
+      .then(waitForActivated)
+      .then(checkWhetherItSkippedWaiting)
+      .then(clean)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_streamfilter.html b/dom/serviceworkers/test/test_streamfilter.html
new file mode 100644
index 0000000000..7367fb8b84
--- /dev/null
+++ b/dom/serviceworkers/test/test_streamfilter.html
@@ -0,0 +1,207 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>
+    Test StreamFilter-monitored responses for ServiceWorker-intercepted requests
+  </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script>
+// eslint-disable-next-line mozilla/no-addtask-setup
+add_task(async function setup() {
+  SimpleTest.waitForExplicitFinish();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ],
+  });
+
+  const registration = await navigator.serviceWorker.register(
+    "streamfilter_worker.js"
+  );
+
+  SimpleTest.registerCleanupFunction(async function unregisterRegistration() {
+    await registration.unregister();
+  });
+
+  await new Promise(resolve => {
+    const serviceWorker = registration.installing;
+
+    serviceWorker.onstatechange = () => {
+      if (serviceWorker.state == "activated") {
+        resolve();
+      }
+    };
+  });
+
+  ok(navigator.serviceWorker.controller, "Page is controlled");
+});
+
+async function getExtension() {
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["webRequest", "webRequestBlocking", "<all_urls>"],
+    },
+
+    // This WebExtension only proxies a response's data through a StreamFilter;
+    // it doesn't modify the data itself in any way.
+    background() {
+      class FilterWrapper {
+        constructor(requestId) {
+          const filter = browser.webRequest.filterResponseData(requestId);
+          const arrayBuffers = [];
+
+          filter.onstart = () => {
+            browser.test.sendMessage("start");
+          };
+
+          filter.ondata = ({ data }) => {
+            arrayBuffers.push(data);
+          };
+
+          filter.onstop = () => {
+            browser.test.sendMessage("stop");
+            new Blob(arrayBuffers).arrayBuffer().then(buffer => {
+              filter.write(buffer);
+              filter.close();
+            });
+          };
+
+          filter.onerror = () => {
+            // We only ever expect a redirect error here.
+            browser.test.assertEq(filter.error, "ServiceWorker fallback redirection");
+            browser.test.sendMessage("error");
+          };
+        }
+      }
+
+      browser.webRequest.onBeforeRequest.addListener(
+        details => {
+          new FilterWrapper(details.requestId);
+        },
+        {
+          urls: ["<all_urls>"],
+          types: ["xmlhttprequest"],
+        },
+        ["blocking"]
+      );
+    },
+  });
+
+  await extension.startup();
+  return extension;
+}
+
+const streamFilterServerUrl = `${location.origin}/tests/dom/serviceworkers/test/streamfilter_server.sjs`;
+
+const requestUrlForServerQueryString = "syntheticResponse=0";
+
+// streamfilter_server.sjs is expected to respond to a request to this URL.
+const requestUrlForServer = `${streamFilterServerUrl}?${requestUrlForServerQueryString}`;
+
+const requestUrlForServiceWorkerQueryString = "syntheticResponse=1";
+
+// streamfilter_worker.js is expected to respond to a request to this URL.
+const requestUrlForServiceWorker = `${streamFilterServerUrl}?${requestUrlForServiceWorkerQueryString}`;
+
+// startNetworkerRequestFn must be a function that, when called, starts a
+// network request and returns a promise that resolves after the request
+// completes (or fails). This function will return the value that that promise
+// resolves with (or throw if it rejects).
+async function observeFilteredNetworkRequest(startNetworkRequestFn, promises) {
+  const networkRequestPromise = startNetworkRequestFn();
+  await Promise.all(promises);
+  return networkRequestPromise;
+}
+
+// Returns a promise that resolves with the XHR's response text.
+function callXHR(requestUrl, promises) {
+  return observeFilteredNetworkRequest(() => {
+    return new Promise((resolve, reject) => {
+      const xhr = new XMLHttpRequest();
+      xhr.onload = () => {
+        resolve(xhr.responseText);
+      };
+      xhr.onerror = reject;
+      xhr.open("GET", requestUrl);
+      xhr.send();
+    });
+  }, promises);
+}
+
+// Returns a promise that resolves with the Fetch's response text.
+function callFetch(requestUrl, promises) {
+  return observeFilteredNetworkRequest(() => {
+    return fetch(requestUrl).then(response => response.text());
+  }, promises);
+}
+
+// The expected response text is always the query string (without the leading
+// "?") of the request URL.
+add_task(async function callXhrExpectServerResponse() {
+  info(`Performing XHR at ${requestUrlForServer}...`);
+  let extension = await getExtension();
+  is(
+    await callXHR(requestUrlForServer, [
+      extension.awaitMessage("start"),
+      extension.awaitMessage("error"),
+      extension.awaitMessage("stop"),
+    ]),
+    requestUrlForServerQueryString,
+    "Server-supplied response for XHR completed successfully"
+  );
+  await extension.unload();
+});
+
+add_task(async function callXhrExpectServiceWorkerResponse() {
+  info(`Performing XHR at ${requestUrlForServiceWorker}...`);
+  let extension = await getExtension();
+  is(
+    await callXHR(requestUrlForServiceWorker, [
+      extension.awaitMessage("start"),
+      extension.awaitMessage("stop"),
+    ]),
+    requestUrlForServiceWorkerQueryString,
+    "ServiceWorker-supplied response for XHR completed successfully"
+  );
+  await extension.unload();
+});
+
+add_task(async function callFetchExpectServerResponse() {
+  info(`Performing Fetch at ${requestUrlForServer}...`);
+  let extension = await getExtension();
+  is(
+    await callFetch(requestUrlForServer, [
+      extension.awaitMessage("start"),
+      extension.awaitMessage("error"),
+      extension.awaitMessage("stop"),
+    ]),
+    requestUrlForServerQueryString,
+    "Server-supplied response for Fetch completed successfully"
+  );
+  await extension.unload();
+});
+
+add_task(async function callFetchExpectServiceWorkerResponse() {
+  info(`Performing Fetch at ${requestUrlForServiceWorker}...`);
+  let extension = await getExtension();
+  is(
+    await callFetch(requestUrlForServiceWorker, [
+      extension.awaitMessage("start"),
+      extension.awaitMessage("stop"),
+    ]),
+    requestUrlForServiceWorkerQueryString,
+    "ServiceWorker-supplied response for Fetch completed successfully"
+  );
+  await extension.unload();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_strict_mode_warning.html b/dom/serviceworkers/test/test_strict_mode_warning.html
new file mode 100644
index 0000000000..4df0d1a380
--- /dev/null
+++ b/dom/serviceworkers/test/test_strict_mode_warning.html
@@ -0,0 +1,42 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1170550 - test registration of service worker scripts with a strict mode warning</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function runTest() {
+    navigator.serviceWorker
+      .register("strict_mode_warning.js", {scope: "strict_mode_warning"})
+      .then((reg) => {
+        ok(true, "Registration should not fail for warnings");
+        return reg.unregister();
+      })
+      .then(() => {
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  onload = function() {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+    ]}, runTest);
+  };
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_third_party_iframes.html b/dom/serviceworkers/test/test_third_party_iframes.html
new file mode 100644
index 0000000000..90e9dadfa8
--- /dev/null
+++ b/dom/serviceworkers/test/test_third_party_iframes.html
@@ -0,0 +1,263 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+  <title>Bug 1152899 - Disallow the interception of third-party iframes using service workers when the third-party cookie preference is set</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+var chromeScript;
+chromeScript = SpecialPowers.loadChromeScript(_ => {
+  /* eslint-env mozilla/chrome-script */
+  Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_ALL, value => resolve());
+});
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestLongerTimeout(2);
+
+let index = 0;
+function next() {
+  info("Step " + index);
+  if (index >= steps.length) {
+    SimpleTest.finish();
+    return;
+  }
+  try {
+    let i = index++;
+    steps[i]();
+  } catch(ex) {
+    ok(false, "Caught exception", ex);
+  }
+}
+
+onload = next;
+
+let iframe;
+let proxyWindow;
+let basePath = "/tests/dom/serviceworkers/test/thirdparty/";
+let origin = window.location.protocol + "//" + window.location.host;
+let thirdPartyOrigin = "https://example.com";
+
+function loadIframe() {
+  let message = {
+    source: "parent",
+    href: origin + basePath + "iframe2.html"
+  };
+  iframe.contentWindow.postMessage(message, "*");
+}
+
+function loadThirdPartyIframe() {
+  let message = {
+    source: "parent",
+    href: thirdPartyOrigin + basePath + "iframe2.html"
+  }
+  iframe.contentWindow.postMessage(message, "*");
+}
+
+function runTest(aExpectedResponses) {
+  // Let's use a proxy window to have the new cookie policy applied.
+  proxyWindow = window.open("window_party_iframes.html");
+  proxyWindow.onload = _ => {
+    iframe = proxyWindow.document.querySelector("iframe");
+    iframe.src = thirdPartyOrigin + basePath + "register.html";
+    let responsesIndex = 0;
+    window.onmessage = function(e) {
+      let status = e.data.status;
+      let expected = aExpectedResponses[responsesIndex];
+      if (status == expected.status) {
+        ok(true, "Received expected " + expected.status);
+        if (expected.next) {
+          expected.next();
+        }
+      } else {
+        ok(false, "Expected " + expected.status + " got " + status);
+      }
+      responsesIndex++;
+    };
+  }
+}
+
+// Verify that we can register and intercept a 3rd party iframe with
+// the given cookie policy.
+function testShouldIntercept(behavior, done) {
+  SpecialPowers.pushPrefEnv({"set": [
+      ["network.cookie.cookieBehavior", behavior],
+  ]}, function() {
+    runTest([{
+      status: "ok"
+    }, {
+      status: "registrationdone",
+      next() {
+        iframe.src = origin + basePath + "iframe1.html";
+      }
+    }, {
+      status: "iframeloaded",
+      next: loadIframe
+    }, {
+      status: "networkresponse",
+    }, {
+      status: "worker-networkresponse",
+      next: loadThirdPartyIframe
+    }, {
+      status: "swresponse",
+    }, {
+      status: "worker-swresponse",
+      next() {
+        iframe.src = thirdPartyOrigin + basePath + "unregister.html";
+      }
+    }, {
+      status: "controlled",
+    }, {
+      status: "unregistrationdone",
+      next() {
+        window.onmessage = null;
+        proxyWindow.close();
+        ok(true, "Test finished successfully");
+        done();
+      }
+    }]);
+  });
+}
+
+// Verify that we cannot register a service worker in a 3rd party
+// iframe with the given cookie policy.
+function testShouldNotRegister(behavior, done) {
+  SpecialPowers.pushPrefEnv({"set": [
+      ["network.cookie.cookieBehavior", behavior],
+  ]}, function() {
+    runTest([{
+      status: "registrationfailed",
+      next() {
+        iframe.src = origin + basePath + "iframe1.html";
+      }
+    }, {
+      status: "iframeloaded",
+      next: loadIframe
+    }, {
+      status: "networkresponse",
+    }, {
+      status: "worker-networkresponse",
+      next: loadThirdPartyIframe
+    }, {
+      status: "networkresponse",
+    }, {
+      status: "worker-networkresponse",
+      next() {
+        window.onmessage = null;
+        proxyWindow.close();
+        ok(true, "Test finished successfully");
+        done();
+      }
+    }]);
+  });
+}
+
+// Verify that if a service worker is already registered a 3rd
+// party iframe will still not be intercepted with the given cookie
+// policy.
+function testShouldNotIntercept(behavior, done) {
+  SpecialPowers.pushPrefEnv({"set": [
+    ["network.cookie.cookieBehavior", BEHAVIOR_ACCEPT],
+  ]}, function() {
+    runTest([{
+      status: "ok"
+    }, {
+      status: "registrationdone",
+      next() {
+        SpecialPowers.pushPrefEnv({"set": [
+            ["network.cookie.cookieBehavior", behavior],
+          ]}, function() {
+            proxyWindow.close();
+            proxyWindow = window.open("window_party_iframes.html");
+            proxyWindow.onload = _ => {
+              iframe = proxyWindow.document.querySelector("iframe");
+              iframe.src = origin + basePath + "iframe1.html";
+            }
+          });
+      }
+    }, {
+      status: "iframeloaded",
+      next: loadIframe
+    }, {
+      status: "networkresponse",
+    }, {
+      status: "worker-networkresponse",
+      next: loadThirdPartyIframe
+    }, {
+      status: "networkresponse",
+    }, {
+      status: "worker-networkresponse",
+      next() {
+        iframe.src = thirdPartyOrigin + basePath + "unregister.html";
+      }
+    }, {
+      status: "uncontrolled",
+    }, {
+      status: "getregistrationfailed",
+      next() {
+        SpecialPowers.pushPrefEnv({"set": [
+            ["network.cookie.cookieBehavior", BEHAVIOR_ACCEPT],
+          ]}, function() {
+            proxyWindow.close();
+            proxyWindow = window.open("window_party_iframes.html");
+            proxyWindow.onload = _ => {
+              iframe = proxyWindow.document.querySelector("iframe");
+              iframe.src = thirdPartyOrigin + basePath + "unregister.html";
+            }
+          });
+      }
+    }, {
+      status: "controlled",
+    }, {
+      status: "unregistrationdone",
+      next() {
+        window.onmessage = null;
+        proxyWindow.close();
+        ok(true, "Test finished successfully");
+        done();
+      }
+    }]);
+  });
+}
+
+const BEHAVIOR_ACCEPT        = 0;
+const BEHAVIOR_REJECTFOREIGN = 1;
+const BEHAVIOR_REJECT        = 2;
+const BEHAVIOR_LIMITFOREIGN  = 3;
+
+let steps = [() => {
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["browser.dom.window.dump.enabled", true],
+    ["network.cookie.cookieBehavior", BEHAVIOR_ACCEPT],
+  ]}, next);
+}, () => {
+  testShouldNotRegister(BEHAVIOR_REJECTFOREIGN, next);
+}, () => {
+  testShouldNotIntercept(BEHAVIOR_REJECTFOREIGN, next);
+}, () => {
+  testShouldNotRegister(BEHAVIOR_REJECT, next);
+}, () => {
+  testShouldNotIntercept(BEHAVIOR_REJECT, next);
+}, () => {
+  testShouldNotRegister(BEHAVIOR_LIMITFOREIGN, next);
+}, () => {
+  testShouldNotIntercept(BEHAVIOR_LIMITFOREIGN, next);
+}, () => {
+  testShouldIntercept(BEHAVIOR_ACCEPT, next);
+}];
+
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_unregister.html b/dom/serviceworkers/test/test_unregister.html
new file mode 100644
index 0000000000..af02931efb
--- /dev/null
+++ b/dom/serviceworkers/test/test_unregister.html
@@ -0,0 +1,136 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 984048 - Test unregister</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    return navigator.serviceWorker.register("worker.js", { scope: "unregister/" }).then(function(swr) {
+      if (swr.installing) {
+        return new Promise(function(resolve, reject) {
+          swr.installing.onstatechange = function(e) {
+            if (swr.waiting) {
+              swr.waiting.onstatechange = function(event) {
+                if (swr.active) {
+                  resolve();
+                } else if (swr.waiting && swr.waiting.state == "redundant") {
+                  reject("Should not go into redundant");
+                }
+              }
+            } else {
+              if (swr.active) {
+                resolve();
+              } else {
+                reject("No waiting and no active!");
+              }
+            }
+          }
+        });
+      } else {
+        return Promise.reject("Installing should be non-null");
+      }
+    });
+  }
+
+  function testControlled() {
+    var testPromise = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (!("controlled" in e.data)) {
+          ok(false, "Something went wrong.");
+          rej();
+          return;
+        }
+
+        ok(e.data.controlled, "New window should be controlled.");
+        res();
+      }
+    })
+
+    var div = document.getElementById("content");
+    ok(div, "Parent exists");
+
+    var ifr = document.createElement("iframe");
+    ifr.setAttribute('src', "unregister/index.html");
+    div.appendChild(ifr);
+
+    return testPromise.then(function() {
+      div.removeChild(ifr);
+    });
+  }
+
+  async function unregister() {
+    let reg = await navigator.serviceWorker.getRegistration("unregister/")
+    if (!reg) {
+      info("Registration already removed");
+      return;
+    }
+
+    info("getRegistration() succeeded " + reg.scope);
+    try {
+      let v = await reg.unregister();
+      ok(v, "Unregister should resolve to true");
+    } catch (e) {
+      ok(false, "Unregister failed with " + e.name);
+    }
+  }
+
+  function testUncontrolled() {
+    var testPromise = new Promise(function(res, rej) {
+      window.onmessage = function(e) {
+        if (!("controlled" in e.data)) {
+          ok(false, "Something went wrong.");
+          rej();
+          return;
+        }
+
+        ok(!e.data.controlled, "New window should not be controlled.");
+        res();
+      }
+    });
+
+    var div = document.getElementById("content");
+    ok(div, "Parent exists");
+
+    var ifr = document.createElement("iframe");
+    ifr.setAttribute('src', "unregister/index.html");
+    div.appendChild(ifr);
+
+    return testPromise.then(function() {
+      div.removeChild(ifr);
+    });
+  }
+
+  function runTest() {
+    simpleRegister()
+      .then(testControlled)
+      .then(unregister)
+      .then(testUncontrolled)
+      .then(function() {
+        SimpleTest.finish();
+      }).catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+        SimpleTest.finish();
+      });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_unresolved_fetch_interception.html b/dom/serviceworkers/test/test_unresolved_fetch_interception.html
new file mode 100644
index 0000000000..7182b0fb86
--- /dev/null
+++ b/dom/serviceworkers/test/test_unresolved_fetch_interception.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test that an unresolved respondWith promise will reset the channel when
+  the service worker is terminated due to idling, and that appropriate error
+  messages are logged for both the termination of the serice worker and the
+  resetting of the channel.
+  -->
+<head>
+  <title>Test for Bug 1188545</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1188545">Mozilla Bug 118845</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+// (This doesn't really need to be its own task, but it allows the actual test
+// case to be self-contained.)
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+add_task(async function grace_timeout_termination_with_interrupted_intercept() {
+  // Setup timeouts so that the service worker will go into grace timeout after
+  // a zero-length idle timeout.
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.idle_timeout", 0],
+    ["dom.serviceWorkers.idle_extended_timeout", 299999]]});
+
+  let registration = await navigator.serviceWorker.register(
+    "unresolved_fetch_worker.js", { scope: "./"} );
+  await waitForState(registration.installing, "activated");
+  ok(navigator.serviceWorker.controller, "Controlled"); // double check!
+
+  // We want to make sure the SW is active and processing the fetch before we
+  // try and kill it.  It sends us a message when it has done so.
+  let waitForFetchActive = new Promise((resolve) => {
+    navigator.serviceWorker.onmessage = resolve;
+  });
+
+  // Issue a fetch which the SW will respondWith() a never resolved promise.
+  // The fetch, however, will terminate when the SW is killed, so check that.
+  let hangingFetch = fetch("does_not_exist.html")
+    .then(() => { ok(false, "should have rejected "); },
+          () => { ok(true, "hung fetch terminates when worker dies"); });
+
+  await waitForFetchActive;
+
+  let expectedMessage = expect_console_message(
+    // Termination error
+    "ServiceWorkerGraceTimeoutTermination",
+    [make_absolute_url("./")],
+    // The interception failure error generated by the RespondWithHandler
+    // destructor when it notices it didn't get a response before being
+    // destroyed.  It logs via the intercepted channel nsIConsoleReportCollector
+    // that is eventually flushed to our document and its console.
+    "InterceptionFailedWithURL",
+    [make_absolute_url("does_not_exist.html")]
+  );
+
+  // Zero out the grace timeout too so the worker will get terminated after two
+  // zero-length timer firings.  Note that we need to do something to get the
+  // SW to renew its keepalive for this to actually cause the timers to be
+  // rescheduled...
+  await SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.idle_extended_timeout", 0]]});
+  // ...which we do by postMessaging it.
+  navigator.serviceWorker.controller.postMessage("doomity doom doom");
+
+  // Now wait for signs that the worker was terminated by the fetch failing.
+  await hangingFetch;
+
+  // The worker should now be dead and the error logged, wait/assert.
+  await wait_for_expected_message(expectedMessage);
+
+  // roll back all of our test case specific preferences and otherwise cleanup
+  await SpecialPowers.popPrefEnv();
+  await SpecialPowers.popPrefEnv();
+  await registration.unregister();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_workerUnregister.html b/dom/serviceworkers/test/test_workerUnregister.html
new file mode 100644
index 0000000000..d0bc1d6ce4
--- /dev/null
+++ b/dom/serviceworkers/test/test_workerUnregister.html
@@ -0,0 +1,81 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 982728 - Test ServiceWorkerGlobalScope.unregister</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<div id="container"></div>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    return navigator.serviceWorker.register("worker_unregister.js", { scope: "unregister/" }).then(function(swr) {
+      if (swr.installing) {
+        return new Promise(function(resolve, reject) {
+          swr.installing.onstatechange = function(e) {
+            if (swr.waiting) {
+              swr.waiting.onstatechange = function(event) {
+                if (swr.active) {
+                  resolve();
+                } else if (swr.waiting && swr.waiting.state == "redundant") {
+                  reject("Should not go into redundant");
+                }
+              }
+            } else {
+              if (swr.active) {
+                resolve();
+              } else {
+                reject("No waiting and no active!");
+              }
+            }
+          }
+        });
+      } else {
+        return Promise.reject("Installing should be non-null");
+      }
+    });
+  }
+
+  function waitForMessages(sw) {
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data === "DONE") {
+          ok(true, "The worker has unregistered itself");
+        } else if (e.data === "ERROR") {
+          ok(false, "The worker has unregistered itself");
+        } else if (e.data === "FINISH") {
+          resolve();
+        }
+      }
+    });
+
+    var frame = document.createElement("iframe");
+    frame.setAttribute("src", "unregister/unregister.html");
+    document.body.appendChild(frame);
+
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister().then(waitForMessages).catch(function(e) {
+      ok(false, "Something went wrong.");
+    }).then(function() {
+      SimpleTest.finish();
+    });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_workerUpdate.html b/dom/serviceworkers/test/test_workerUpdate.html
new file mode 100644
index 0000000000..015e6bb4ae
--- /dev/null
+++ b/dom/serviceworkers/test/test_workerUpdate.html
@@ -0,0 +1,63 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1065366 - Test ServiceWorkerGlobalScope.update</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<div id="container"></div>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+
+  function simpleRegister() {
+    return navigator.serviceWorker.register("worker_update.js", { scope: "workerUpdate/" })
+      .then(swr => waitForState(swr.installing, 'activated', swr));
+  }
+
+  var registration;
+  function waitForMessages(sw) {
+    registration = sw;
+    var p = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+        if (e.data === "FINISH") {
+          ok(true, "The worker has updated itself");
+          resolve();
+        } else if (e.data === "FAIL") {
+          ok(false, "The worker failed to update itself");
+          resolve();
+        }
+      }
+    });
+
+    var frame = document.createElement("iframe");
+    frame.setAttribute("src", "workerUpdate/update.html");
+    document.body.appendChild(frame);
+
+    return p;
+  }
+
+  function runTest() {
+    simpleRegister().then(waitForMessages).catch(function(e) {
+      ok(false, "Something went wrong.");
+    }).then(function() {
+      return registration.unregister();
+    }).then(function() {
+      SimpleTest.finish();
+    });
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_worker_reference_gc_timeout.html b/dom/serviceworkers/test/test_worker_reference_gc_timeout.html
new file mode 100644
index 0000000000..cf04e13f2e
--- /dev/null
+++ b/dom/serviceworkers/test/test_worker_reference_gc_timeout.html
@@ -0,0 +1,76 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  -->
+<head>
+  <title>Test for Bug 1317266</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="error_reporting_helpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1317266">Mozilla Bug 1317266</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="text/javascript">
+SimpleTest.requestFlakyTimeout("Forcing a race with the cycle collector.");
+
+add_task(function setupPrefs() {
+  return SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]});
+});
+
+add_task(async function test_worker_ref_gc() {
+  let registration = await navigator.serviceWorker.register(
+    "lazy_worker.js", { scope: "./lazy_worker_scope_timeout"} )
+    .then(function(reg) {
+      SpecialPowers.exactGC();
+      var worker = reg.installing;
+      return new Promise(function(resolve) {
+        worker.addEventListener('statechange', function() {
+          info("state is " + worker.state + "\n");
+          SpecialPowers.exactGC();
+          if (worker.state === 'activated') {
+            resolve(reg);
+          }
+        });
+      });
+    });
+  ok(true, "Got activated event!");
+
+  await registration.unregister();
+});
+
+add_task(async function test_worker_ref_gc_ready_promise() {
+  let wait_active = navigator.serviceWorker.ready.then(function(reg) {
+    SpecialPowers.exactGC();
+    ok(reg.active, "Got active worker.");
+    ok(reg.active.state === "activating", "Worker is in activating state");
+    return new Promise(function(res) {
+      reg.active.onstatechange = function(e) {
+        reg.active.onstatechange = null;
+        ok(reg.active.state === "activated", "Worker was activated");
+        res();
+      }
+    });
+  });
+
+  let registration = await navigator.serviceWorker.register(
+    "lazy_worker.js", { scope: "."} );
+  await wait_active;
+  await registration.unregister();
+});
+
+add_task(async function cleanup() {
+  await SpecialPowers.popPrefEnv();
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_workerupdatefoundevent.html b/dom/serviceworkers/test/test_workerupdatefoundevent.html
new file mode 100644
index 0000000000..1c3ced13bd
--- /dev/null
+++ b/dom/serviceworkers/test/test_workerupdatefoundevent.html
@@ -0,0 +1,91 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1131327 - Test ServiceWorkerRegistration.onupdatefound on ServiceWorker</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var promise;
+
+  async function start() {
+    registration = await navigator.serviceWorker.register("worker_updatefoundevent.js",
+                                                          { scope: "./updatefoundevent.html" })
+    await waitForState(registration.installing, 'activated');
+
+    content = document.getElementById("content");
+    iframe = document.createElement("iframe");
+    content.appendChild(iframe);
+    iframe.setAttribute("src", "./updatefoundevent.html");
+
+    await new Promise(function(resolve) { iframe.onload = resolve; });
+    ok(iframe.contentWindow.navigator.serviceWorker.controller, "Controlled client.");
+
+    return Promise.resolve();
+
+  }
+
+  function startWaitForUpdateFound() {
+    registration.onupdatefound = function(e) {
+    }
+
+    promise = new Promise(function(resolve, reject) {
+      window.onmessage = function(e) {
+
+        if (e.data == "finish") {
+          ok(true, "Received updatefound");
+          resolve();
+        }
+      }
+    });
+
+    return Promise.resolve();
+  }
+
+  function registerNext() {
+    return navigator.serviceWorker.register("worker_updatefoundevent2.js",
+                                            { scope: "./updatefoundevent.html" });
+  }
+
+  function waitForUpdateFound() {
+    return promise;
+  }
+
+  function unregister() {
+    window.onmessage = null;
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    });
+  }
+
+  function runTest() {
+     start()
+      .then(startWaitForUpdateFound)
+      .then(registerNext)
+      .then(waitForUpdateFound)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/test_xslt.html b/dom/serviceworkers/test/test_xslt.html
new file mode 100644
index 0000000000..a955c843ac
--- /dev/null
+++ b/dom/serviceworkers/test/test_xslt.html
@@ -0,0 +1,117 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1182113 - Test service worker XSLT interception</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test"></pre>
+<script src="utils.js"></script>
+<script class="testbody" type="text/javascript">
+  var registration;
+  var worker;
+
+  function start() {
+    return navigator.serviceWorker.register("xslt_worker.js",
+                                            { scope: "./" })
+      .then((swr) => {
+        registration = swr;
+
+        // Ensure the registration is active before continuing
+        return waitForState(swr.installing, 'activated');
+      });
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+  function getXmlString(xmlObject) {
+    serializer = new XMLSerializer();
+    return serializer.serializeToString(iframe.contentDocument);
+  }
+
+  function synthetic() {
+    content = document.getElementById("content");
+    ok(content, "parent exists.");
+
+    iframe = document.createElement("iframe");
+    content.appendChild(iframe);
+
+    iframe.setAttribute('src', "xslt/test.xml");
+
+    var p = new Promise(function(res, rej) {
+      iframe.onload = function(e) {
+        dump("Set request mode\n");
+        registration.active.postMessage("synthetic");
+        xmlString = getXmlString(iframe.contentDocument);
+        ok(!xmlString.includes("Error"), "Load synthetic cross origin XSLT should be allowed");
+        res();
+      };
+    });
+
+    return p;
+  }
+
+  function cors() {
+    var p = new Promise(function(res, rej) {
+      iframe.onload = function(e) {
+        xmlString = getXmlString(iframe.contentDocument);
+        ok(!xmlString.includes("Error"), "Load CORS cross origin XSLT should be allowed");
+        res();
+      };
+    });
+
+    registration.active.postMessage("cors");
+    iframe.setAttribute('src', "xslt/test.xml");
+
+    return p;
+  }
+
+  function opaque() {
+    var p = new Promise(function(res, rej) {
+      iframe.onload = function(e) {
+        xmlString = getXmlString(iframe.contentDocument);
+        ok(xmlString.includes("Error"), "Load opaque cross origin XSLT should not be allowed");
+        res();
+      };
+    });
+
+    registration.active.postMessage("opaque");
+    iframe.setAttribute('src', "xslt/test.xml");
+
+    return p;
+  }
+
+  function runTest() {
+     start()
+      .then(synthetic)
+      .then(opaque)
+      .then(cors)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/thirdparty/iframe1.html b/dom/serviceworkers/test/thirdparty/iframe1.html
new file mode 100644
index 0000000000..e8982d306a
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/iframe1.html
@@ -0,0 +1,42 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+  <title>SW third party iframe test</title>
+
+  <script type="text/javascript">
+    function messageListener(event) {
+      let message = event.data;
+
+      dump("got message " + JSON.stringify(message) + "\n");
+      if (message.source == "parent") {
+        document.getElementById("iframe2").src = message.href;
+      }
+      else if (message.source == "iframe") {
+        parent.postMessage(event.data, "*");
+      } else if (message.source == "worker") {
+        parent.postMessage(event.data, "*");
+      }
+    }
+  </script>
+
+</head>
+
+<body>
+  <script>
+    onload = function() {
+      window.addEventListener('message', messageListener);
+      let message = {
+        source: "iframe",
+        status: "iframeloaded",
+      }
+      parent.postMessage(message, "*");
+    }
+  </script>
+  <iframe id="iframe2"></iframe>
+</body>
+
+</html>
diff --git a/dom/serviceworkers/test/thirdparty/iframe2.html b/dom/serviceworkers/test/thirdparty/iframe2.html
new file mode 100644
index 0000000000..8013899195
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/iframe2.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  window.parent.postMessage({
+    source: "iframe",
+    status: "networkresponse"
+  }, "*");
+  var w = new Worker('worker.js');
+  w.onmessage = function(evt) {
+    window.parent.postMessage({
+      source: 'worker',
+      status: evt.data,
+    }, '*');
+  };
+</script>
diff --git a/dom/serviceworkers/test/thirdparty/register.html b/dom/serviceworkers/test/thirdparty/register.html
new file mode 100644
index 0000000000..b166acb8a4
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/register.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<script>
+  function ok(v, msg) {
+    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
+  }
+
+  var isDone = false;
+  function done(reg) {
+    if (!isDone) {
+      ok(reg.waiting || reg.active,
+         "Either active or waiting worker should be available.");
+      window.parent.postMessage({status: "registrationdone"}, "*");
+      isDone = true;
+    }
+  }
+
+  navigator.serviceWorker.register("sw.js", {scope: "."})
+    .then(function(registration) {
+      if (registration.installing) {
+        registration.installing.onstatechange = function(e) {
+          done(registration);
+        };
+      } else {
+        done(registration);
+      }
+    }).catch(function(e) {
+      window.parent.postMessage({status: "registrationfailed"}, "*");
+    });
+</script>
diff --git a/dom/serviceworkers/test/thirdparty/sw.js b/dom/serviceworkers/test/thirdparty/sw.js
new file mode 100644
index 0000000000..ed91f333bf
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/sw.js
@@ -0,0 +1,32 @@
+self.addEventListener("fetch", function (event) {
+  dump("fetch " + event.request.url + "\n");
+  if (event.request.url.includes("iframe2.html")) {
+    var body =
+      "<script>" +
+      "window.parent.postMessage({" +
+      "source: 'iframe', status: 'swresponse'" +
+      "}, '*');" +
+      "var w = new Worker('worker.js');" +
+      "w.onmessage = function(evt) {" +
+      "window.parent.postMessage({" +
+      "source: 'worker'," +
+      "status: evt.data," +
+      "}, '*');" +
+      "};" +
+      "</script>";
+    event.respondWith(
+      new Response(body, {
+        headers: { "Content-Type": "text/html" },
+      })
+    );
+    return;
+  }
+  if (event.request.url.includes("worker.js")) {
+    var body = "self.postMessage('worker-swresponse');";
+    event.respondWith(
+      new Response(body, {
+        headers: { "Content-Type": "application/javascript" },
+      })
+    );
+  }
+});
diff --git a/dom/serviceworkers/test/thirdparty/unregister.html b/dom/serviceworkers/test/thirdparty/unregister.html
new file mode 100644
index 0000000000..65b29d5648
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/unregister.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<script>
+  if (navigator.serviceWorker.controller) {
+    window.parent.postMessage({status: "controlled"}, "*");
+  } else {
+    window.parent.postMessage({status: "uncontrolled"}, "*");
+  }
+
+  navigator.serviceWorker.getRegistration(".").then(function(registration) {
+    if(!registration) {
+      return;
+    }
+    registration.unregister().then(() => {
+      window.parent.postMessage({status: "unregistrationdone"}, "*");
+    });
+  }).catch(function(e) {
+    window.parent.postMessage({status: "getregistrationfailed"}, "*");
+  });
+</script>
diff --git a/dom/serviceworkers/test/thirdparty/worker.js b/dom/serviceworkers/test/thirdparty/worker.js
new file mode 100644
index 0000000000..bbdc608cde
--- /dev/null
+++ b/dom/serviceworkers/test/thirdparty/worker.js
@@ -0,0 +1 @@
+self.postMessage("worker-networkresponse");
diff --git a/dom/serviceworkers/test/unregister/index.html b/dom/serviceworkers/test/unregister/index.html
new file mode 100644
index 0000000000..36cac9fcf6
--- /dev/null
+++ b/dom/serviceworkers/test/unregister/index.html
@@ -0,0 +1,26 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 984048 - Test unregister</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  if (!parent) {
+    info("unregister/index.html should not to be launched directly!");
+  }
+
+  parent.postMessage({ controlled: !!navigator.serviceWorker.controller }, "*");
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/unregister/unregister.html b/dom/serviceworkers/test/unregister/unregister.html
new file mode 100644
index 0000000000..42633ca343
--- /dev/null
+++ b/dom/serviceworkers/test/unregister/unregister.html
@@ -0,0 +1,21 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test worker::unregister</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script type="text/javascript">
+
+  navigator.serviceWorker.onmessage = function(e) { parent.postMessage(e.data, "*"); }
+  navigator.serviceWorker.controller.postMessage("GO");
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/unresolved_fetch_worker.js b/dom/serviceworkers/test/unresolved_fetch_worker.js
new file mode 100644
index 0000000000..fae74f34b8
--- /dev/null
+++ b/dom/serviceworkers/test/unresolved_fetch_worker.js
@@ -0,0 +1,18 @@
+var keepPromiseAlive;
+onfetch = function (event) {
+  event.waitUntil(
+    clients.matchAll().then(clients => {
+      clients.forEach(client => {
+        client.postMessage("continue");
+      });
+    })
+  );
+
+  // Never resolve, and keep it alive on our global so it can't get GC'ed and
+  // make this test weird and intermittent.
+  event.respondWith((keepPromiseAlive = new Promise(function (res, rej) {})));
+};
+
+addEventListener("activate", function (event) {
+  event.waitUntil(clients.claim());
+});
diff --git a/dom/serviceworkers/test/update_worker.sjs b/dom/serviceworkers/test/update_worker.sjs
new file mode 100644
index 0000000000..44782a2732
--- /dev/null
+++ b/dom/serviceworkers/test/update_worker.sjs
@@ -0,0 +1,12 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+function handleRequest(request, response) {
+  // This header is necessary for making this script able to be loaded.
+  response.setHeader("Content-Type", "application/javascript");
+
+  var body = "/* " + Date.now() + " */";
+  response.write(body);
+}
diff --git a/dom/serviceworkers/test/updatefoundevent.html b/dom/serviceworkers/test/updatefoundevent.html
new file mode 100644
index 0000000000..78088c7cd0
--- /dev/null
+++ b/dom/serviceworkers/test/updatefoundevent.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Bug 1131327 - Test ServiceWorkerRegistration.onupdatefound on ServiceWorker</title>
+</head>
+<body>
+<script>
+  navigator.serviceWorker.onmessage = function(e) {
+    dump("NSM iframe got message " + e.data + "\n");
+    window.parent.postMessage(e.data, "*");
+  };
+</script>
+</body>
diff --git a/dom/serviceworkers/test/utils.js b/dom/serviceworkers/test/utils.js
new file mode 100644
index 0000000000..28be239593
--- /dev/null
+++ b/dom/serviceworkers/test/utils.js
@@ -0,0 +1,136 @@
+function waitForState(worker, state, context) {
+  return new Promise(resolve => {
+    function onStateChange() {
+      if (worker.state === state) {
+        worker.removeEventListener("statechange", onStateChange);
+        resolve(context);
+      }
+    }
+
+    // First add an event listener, so we won't miss any change that happens
+    // before we check the current state.
+    worker.addEventListener("statechange", onStateChange);
+
+    // Now check if the worker is already in the desired state.
+    onStateChange();
+  });
+}
+
+/**
+ * Helper for browser tests to issue register calls from the content global and
+ * wait for the SW to progress to the active state, as most tests desire.
+ * From the ContentTask.spawn, use via
+ * `content.wrappedJSObject.registerAndWaitForActive`.
+ */
+async function registerAndWaitForActive(script, maybeScope) {
+  console.log("...calling register");
+  let opts = undefined;
+  if (maybeScope) {
+    opts = { scope: maybeScope };
+  }
+  const reg = await navigator.serviceWorker.register(script, opts);
+  // Unless registration resurrection happens, the SW should be in the
+  // installing slot.
+  console.log("...waiting for activation");
+  await waitForState(reg.installing, "activated", reg);
+  console.log("...activated!");
+  return reg;
+}
+
+/**
+ * Helper to create an iframe with the given URL and return the first
+ * postMessage payload received.  This is intended to be used when creating
+ * cross-origin iframes.
+ *
+ * A promise will be returned that resolves with the payload of the postMessage
+ * call.
+ */
+function createIframeAndWaitForMessage(url) {
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  return new Promise(resolve => {
+    window.addEventListener(
+      "message",
+      event => {
+        resolve(event.data);
+      },
+      { once: true }
+    );
+    iframe.src = url;
+  });
+}
+
+/**
+ * Helper to create a nested iframe into the iframe created by
+ * createIframeAndWaitForMessage().
+ *
+ * A promise will be returned that resolves with the payload of the postMessage
+ * call.
+ */
+function createNestedIframeAndWaitForMessage(url) {
+  const iframe = document.getElementsByTagName("iframe")[0];
+  iframe.contentWindow.postMessage("create nested iframe", "*");
+  return new Promise(resolve => {
+    window.addEventListener(
+      "message",
+      event => {
+        resolve(event.data);
+      },
+      { once: true }
+    );
+  });
+}
+
+async function unregisterAll() {
+  const registrations = await navigator.serviceWorker.getRegistrations();
+  for (const reg of registrations) {
+    await reg.unregister();
+  }
+}
+
+/**
+ * Make a blob that contains random data and therefore shouldn't compress all
+ * that well.
+ */
+function makeRandomBlob(size) {
+  const arr = new Uint8Array(size);
+  let offset = 0;
+  /**
+   * getRandomValues will only provide a maximum of 64k of data at a time and
+   * will error if we ask for more, so using a while loop for get a random value
+   * which much larger than 64k.
+   * https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues#exceptions
+   */
+  while (offset < size) {
+    const nextSize = Math.min(size - offset, 65536);
+    window.crypto.getRandomValues(new Uint8Array(arr.buffer, offset, nextSize));
+    offset += nextSize;
+  }
+  return new Blob([arr], { type: "application/octet-stream" });
+}
+
+async function fillStorage(cacheBytes, idbBytes) {
+  // ## Fill Cache API Storage
+  const cache = await caches.open("filler");
+  await cache.put("fill", new Response(makeRandomBlob(cacheBytes)));
+
+  // ## Fill IDB
+  const storeName = "filler";
+  let db = await new Promise((resolve, reject) => {
+    let openReq = indexedDB.open("filler", 1);
+    openReq.onerror = event => {
+      reject(event.target.error);
+    };
+    openReq.onsuccess = event => {
+      resolve(event.target.result);
+    };
+    openReq.onupgradeneeded = event => {
+      const useDB = event.target.result;
+      useDB.onerror = error => {
+        reject(error);
+      };
+      const store = useDB.createObjectStore(storeName);
+      store.put({ blob: makeRandomBlob(idbBytes) }, "filler-blob");
+    };
+  });
+}
diff --git a/dom/serviceworkers/test/window_party_iframes.html b/dom/serviceworkers/test/window_party_iframes.html
new file mode 100644
index 0000000000..abeea4449b
--- /dev/null
+++ b/dom/serviceworkers/test/window_party_iframes.html
@@ -0,0 +1,18 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
+</head>
+<body>
+<iframe></iframe>
+<script>
+window.onmessage = e => {
+  opener.postMessage(e.data, "*");
+}
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/worker.js b/dom/serviceworkers/test/worker.js
new file mode 100644
index 0000000000..2aba167d18
--- /dev/null
+++ b/dom/serviceworkers/test/worker.js
@@ -0,0 +1 @@
+// empty worker, always succeed!
diff --git a/dom/serviceworkers/test/worker2.js b/dom/serviceworkers/test/worker2.js
new file mode 100644
index 0000000000..3072d0817f
--- /dev/null
+++ b/dom/serviceworkers/test/worker2.js
@@ -0,0 +1 @@
+// worker2.js
diff --git a/dom/serviceworkers/test/worker3.js b/dom/serviceworkers/test/worker3.js
new file mode 100644
index 0000000000..449fc2f976
--- /dev/null
+++ b/dom/serviceworkers/test/worker3.js
@@ -0,0 +1 @@
+// worker3.js
diff --git a/dom/serviceworkers/test/workerUpdate/update.html b/dom/serviceworkers/test/workerUpdate/update.html
new file mode 100644
index 0000000000..666e213d14
--- /dev/null
+++ b/dom/serviceworkers/test/workerUpdate/update.html
@@ -0,0 +1,23 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test worker::update</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script type="text/javascript">
+
+  navigator.serviceWorker.onmessage = function(e) { parent.postMessage(e.data, "*"); }
+  navigator.serviceWorker.ready.then(function() {
+    navigator.serviceWorker.controller.postMessage("GO");
+  });
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/worker_unregister.js b/dom/serviceworkers/test/worker_unregister.js
new file mode 100644
index 0000000000..6aa7c3d501
--- /dev/null
+++ b/dom/serviceworkers/test/worker_unregister.js
@@ -0,0 +1,22 @@
+onmessage = function (e) {
+  clients.matchAll().then(function (c) {
+    if (c.length === 0) {
+      // We cannot proceed.
+      return;
+    }
+
+    registration
+      .unregister()
+      .then(
+        function () {
+          c[0].postMessage("DONE");
+        },
+        function () {
+          c[0].postMessage("ERROR");
+        }
+      )
+      .then(function () {
+        c[0].postMessage("FINISH");
+      });
+  });
+};
diff --git a/dom/serviceworkers/test/worker_update.js b/dom/serviceworkers/test/worker_update.js
new file mode 100644
index 0000000000..8935cedc52
--- /dev/null
+++ b/dom/serviceworkers/test/worker_update.js
@@ -0,0 +1,25 @@
+// For now this test only calls update to verify that our registration
+// job queueing works properly when called from the worker thread. We should
+// test actual update scenarios with a SJS test.
+onmessage = function (e) {
+  self.registration
+    .update()
+    .then(function (v) {
+      return v instanceof ServiceWorkerRegistration ? "FINISH" : "FAIL";
+    })
+    .catch(function (ex) {
+      return "FAIL";
+    })
+    .then(function (result) {
+      clients.matchAll().then(function (c) {
+        if (!c.length) {
+          dump(
+            "!!!!!!!!!!! WORKER HAS NO CLIENTS TO FINISH TEST !!!!!!!!!!!!\n"
+          );
+          return;
+        }
+
+        c[0].postMessage(result);
+      });
+    });
+};
diff --git a/dom/serviceworkers/test/worker_updatefoundevent.js b/dom/serviceworkers/test/worker_updatefoundevent.js
new file mode 100644
index 0000000000..96a1815ee5
--- /dev/null
+++ b/dom/serviceworkers/test/worker_updatefoundevent.js
@@ -0,0 +1,20 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+registration.onupdatefound = function (e) {
+  clients.matchAll().then(function (clients) {
+    if (!clients.length) {
+      // We don't control any clients when the first update event is fired
+      // because we haven't reached the 'activated' state.
+      return;
+    }
+
+    if (registration.scope.match(/updatefoundevent\.html$/)) {
+      clients[0].postMessage("finish");
+    } else {
+      dump("Scope did not match");
+    }
+  });
+};
diff --git a/dom/serviceworkers/test/worker_updatefoundevent2.js b/dom/serviceworkers/test/worker_updatefoundevent2.js
new file mode 100644
index 0000000000..da4c592aad
--- /dev/null
+++ b/dom/serviceworkers/test/worker_updatefoundevent2.js
@@ -0,0 +1 @@
+// Not useful.
diff --git a/dom/serviceworkers/test/xslt/test.xml b/dom/serviceworkers/test/xslt/test.xml
new file mode 100644
index 0000000000..83c7776339
--- /dev/null
+++ b/dom/serviceworkers/test/xslt/test.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/xsl" href="test.xsl"?>
+<result>
+  <Title>Example</Title>
+  <Error>Error</Error>
+</result>
diff --git a/dom/serviceworkers/test/xslt/xslt.sjs b/dom/serviceworkers/test/xslt/xslt.sjs
new file mode 100644
index 0000000000..db681ab500
--- /dev/null
+++ b/dom/serviceworkers/test/xslt/xslt.sjs
@@ -0,0 +1,12 @@
+function handleRequest(request, response) {
+  response.setHeader("Content-Type", "application/xslt+xml", false);
+  response.setHeader("Access-Control-Allow-Origin", "*");
+
+  var body = request.queryString;
+  if (!body) {
+    response.setStatusLine(null, 500, "Invalid querystring");
+    return;
+  }
+
+  response.write(unescape(body));
+}
diff --git a/dom/serviceworkers/test/xslt_worker.js b/dom/serviceworkers/test/xslt_worker.js
new file mode 100644
index 0000000000..d7e6eea129
--- /dev/null
+++ b/dom/serviceworkers/test/xslt_worker.js
@@ -0,0 +1,58 @@
+var testType = "synthetic";
+
+var xslt =
+  '<?xml version="1.0"?> ' +
+  '<xsl:stylesheet version="1.0"' +
+  '   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">' +
+  '  <xsl:template match="node()|@*">' +
+  "    <xsl:copy>" +
+  '      <xsl:apply-templates select="node()|@*"/>' +
+  "    </xsl:copy>" +
+  "  </xsl:template>" +
+  '  <xsl:template match="Error"/>' +
+  "</xsl:stylesheet>";
+
+onfetch = function (event) {
+  if (event.request.url.includes("test.xsl")) {
+    if (testType == "synthetic") {
+      if (event.request.mode != "cors") {
+        event.respondWith(Response.error());
+        return;
+      }
+
+      event.respondWith(
+        Promise.resolve(
+          new Response(xslt, {
+            headers: { "Content-Type": "application/xslt+xml" },
+          })
+        )
+      );
+    } else if (testType == "cors") {
+      if (event.request.mode != "cors") {
+        event.respondWith(Response.error());
+        return;
+      }
+
+      var url =
+        "http://example.com/tests/dom/serviceworkers/test/xslt/xslt.sjs?" +
+        escape(xslt);
+      event.respondWith(fetch(url, { mode: "cors" }));
+    } else if (testType == "opaque") {
+      if (event.request.mode != "cors") {
+        event.respondWith(Response.error());
+        return;
+      }
+
+      var url =
+        "http://example.com/tests/dom/serviceworkers/test/xslt/xslt.sjs?" +
+        escape(xslt);
+      event.respondWith(fetch(url, { mode: "no-cors" }));
+    } else {
+      event.respondWith(Response.error());
+    }
+  }
+};
+
+onmessage = function (event) {
+  testType = event.data;
+};