Adding upstream version 124.0.1.upstream/124.0.1

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

43 files changed, 3859 insertions, 0 deletions

diff --git a/dom/url/URL.cpp b/dom/url/URL.cpp
new file mode 100644
index 0000000000..799bb72cff
--- /dev/null
+++ b/dom/url/URL.cpp
@@ -0,0 +1,426 @@
+/* -*- 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 "URL.h"
+#include "URLMainThread.h"
+#include "URLWorker.h"
+
+#include "nsASCIIMask.h"
+#include "MainThreadUtils.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/URLBinding.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/Document.h"
+#include "nsIURIMutator.h"
+#include "nsNetUtil.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(URL, mParent, mSearchParams)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(URL)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(URL)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(URL)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject* URL::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return URL_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */
+already_AddRefed<URL> URL::Constructor(const GlobalObject& aGlobal,
+                                       const nsAString& aURL,
+                                       const Optional<nsAString>& aBase,
+                                       ErrorResult& aRv) {
+  if (aBase.WasPassed()) {
+    return Constructor(aGlobal.GetAsSupports(), aURL, aBase.Value(), aRv);
+  }
+
+  return Constructor(aGlobal.GetAsSupports(), aURL, nullptr, aRv);
+}
+
+/* static */
+already_AddRefed<URL> URL::Constructor(nsISupports* aParent,
+                                       const nsAString& aURL,
+                                       const nsAString& aBase,
+                                       ErrorResult& aRv) {
+  // Don't use NS_ConvertUTF16toUTF8 because that doesn't let us handle OOM.
+  nsAutoCString base;
+  if (!AppendUTF16toUTF8(aBase, base, fallible)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> baseUri;
+  nsresult rv = NS_NewURI(getter_AddRefs(baseUri), base);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(base);
+    return nullptr;
+  }
+
+  return Constructor(aParent, aURL, baseUri, aRv);
+}
+
+/* static */
+already_AddRefed<URL> URL::Constructor(nsISupports* aParent,
+                                       const nsAString& aURL, nsIURI* aBase,
+                                       ErrorResult& aRv) {
+  // Don't use NS_ConvertUTF16toUTF8 because that doesn't let us handle OOM.
+  nsAutoCString urlStr;
+  if (!AppendUTF16toUTF8(aURL, urlStr, fallible)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), urlStr, nullptr, aBase);
+  if (NS_FAILED(rv)) {
+    // No need to warn in this case. It's common to use the URL constructor
+    // to determine if a URL is valid and an exception will be propagated.
+    aRv.ThrowTypeError<MSG_INVALID_URL>(urlStr);
+    return nullptr;
+  }
+
+  return MakeAndAddRef<URL>(aParent, std::move(uri));
+}
+
+already_AddRefed<URL> URL::FromURI(GlobalObject& aGlobal, nsIURI* aURI) {
+  return MakeAndAddRef<URL>(aGlobal.GetAsSupports(), aURI);
+}
+
+void URL::CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                          nsAString& aResult, ErrorResult& aRv) {
+  if (NS_IsMainThread()) {
+    URLMainThread::CreateObjectURL(aGlobal, aBlob, aResult, aRv);
+  } else {
+    URLWorker::CreateObjectURL(aGlobal, aBlob, aResult, aRv);
+  }
+}
+
+void URL::CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                          nsAString& aResult, ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  URLMainThread::CreateObjectURL(aGlobal, aSource, aResult, aRv);
+}
+
+void URL::RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                          ErrorResult& aRv) {
+  if (aURL.Contains('#')) {
+    // Don't revoke URLs that contain fragments.
+    return;
+  }
+
+  if (NS_IsMainThread()) {
+    URLMainThread::RevokeObjectURL(aGlobal, aURL, aRv);
+  } else {
+    URLWorker::RevokeObjectURL(aGlobal, aURL, aRv);
+  }
+}
+
+bool URL::IsValidObjectURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                           ErrorResult& aRv) {
+  if (NS_IsMainThread()) {
+    return URLMainThread::IsValidObjectURL(aGlobal, aURL, aRv);
+  }
+  return URLWorker::IsValidObjectURL(aGlobal, aURL, aRv);
+}
+
+bool URL::CanParse(const GlobalObject& aGlobal, const nsAString& aURL,
+                   const Optional<nsAString>& aBase) {
+  nsCOMPtr<nsIURI> baseUri;
+  if (aBase.WasPassed()) {
+    // Don't use NS_ConvertUTF16toUTF8 because that doesn't let us handle OOM.
+    nsAutoCString base;
+    if (!AppendUTF16toUTF8(aBase.Value(), base, fallible)) {
+      // Just return false with OOM errors as no ErrorResult.
+      return false;
+    }
+
+    nsresult rv = NS_NewURI(getter_AddRefs(baseUri), base);
+    if (NS_FAILED(rv)) {
+      // Invalid base URL, return false.
+      return false;
+    }
+  }
+
+  nsAutoCString urlStr;
+  if (!AppendUTF16toUTF8(aURL, urlStr, fallible)) {
+    // Just return false with OOM errors as no ErrorResult.
+    return false;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  return NS_SUCCEEDED(NS_NewURI(getter_AddRefs(uri), urlStr, nullptr, baseUri));
+}
+
+URLSearchParams* URL::SearchParams() {
+  CreateSearchParamsIfNeeded();
+  return mSearchParams;
+}
+
+bool IsChromeURI(nsIURI* aURI) { return aURI->SchemeIs("chrome"); }
+
+void URL::CreateSearchParamsIfNeeded() {
+  if (!mSearchParams) {
+    mSearchParams = new URLSearchParams(mParent, this);
+    UpdateURLSearchParams();
+  }
+}
+
+void URL::SetSearch(const nsAString& aSearch) {
+  SetSearchInternal(aSearch);
+  UpdateURLSearchParams();
+}
+
+void URL::URLSearchParamsUpdated(URLSearchParams* aSearchParams) {
+  MOZ_ASSERT(mSearchParams);
+  MOZ_ASSERT(mSearchParams == aSearchParams);
+
+  nsAutoString search;
+  mSearchParams->Serialize(search);
+
+  SetSearchInternal(search);
+}
+
+#define URL_GETTER(value, func)  \
+  MOZ_ASSERT(mURI);              \
+  value.Truncate();              \
+  nsAutoCString tmp;             \
+  nsresult rv = mURI->func(tmp); \
+  if (NS_SUCCEEDED(rv)) {        \
+    CopyUTF8toUTF16(tmp, value); \
+  }
+
+void URL::GetHref(nsAString& aHref) const { URL_GETTER(aHref, GetSpec); }
+
+void URL::SetHref(const nsAString& aHref, ErrorResult& aRv) {
+  // Don't use NS_ConvertUTF16toUTF8 because that doesn't let us handle OOM.
+  nsAutoCString href;
+  if (!AppendUTF16toUTF8(aHref, href, fallible)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), href);
+  if (NS_FAILED(rv)) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(href);
+    return;
+  }
+
+  mURI = std::move(uri);
+  UpdateURLSearchParams();
+}
+
+void URL::GetOrigin(nsAString& aOrigin) const {
+  nsresult rv =
+      nsContentUtils::GetWebExposedOriginSerialization(URI(), aOrigin);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aOrigin.Truncate();
+  }
+}
+
+void URL::GetProtocol(nsAString& aProtocol) const {
+  URL_GETTER(aProtocol, GetScheme);
+  aProtocol.Append(char16_t(':'));
+}
+
+void URL::SetProtocol(const nsAString& aProtocol) {
+  nsCOMPtr<nsIURI> uri(URI());
+  if (!uri) {
+    return;
+  }
+  uri = net::TryChangeProtocol(uri, aProtocol);
+  if (!uri) {
+    return;
+  }
+  mURI = std::move(uri);
+}
+
+void URL::GetUsername(nsAString& aUsername) const {
+  URL_GETTER(aUsername, GetUsername);
+}
+
+void URL::SetUsername(const nsAString& aUsername) {
+  MOZ_ASSERT(mURI);
+
+  Unused << NS_MutateURI(mURI)
+                .SetUsername(NS_ConvertUTF16toUTF8(aUsername))
+                .Finalize(mURI);
+}
+
+void URL::GetPassword(nsAString& aPassword) const {
+  URL_GETTER(aPassword, GetPassword);
+}
+
+void URL::SetPassword(const nsAString& aPassword) {
+  MOZ_ASSERT(mURI);
+
+  Unused << NS_MutateURI(mURI)
+                .SetPassword(NS_ConvertUTF16toUTF8(aPassword))
+                .Finalize(mURI);
+}
+
+void URL::GetHost(nsAString& aHost) const { URL_GETTER(aHost, GetHostPort); }
+
+void URL::SetHost(const nsAString& aHost) {
+  MOZ_ASSERT(mURI);
+
+  Unused << NS_MutateURI(mURI)
+                .SetHostPort(NS_ConvertUTF16toUTF8(aHost))
+                .Finalize(mURI);
+}
+
+void URL::GetHostname(nsAString& aHostname) const {
+  MOZ_ASSERT(mURI);
+
+  aHostname.Truncate();
+  nsContentUtils::GetHostOrIPv6WithBrackets(mURI, aHostname);
+}
+
+void URL::SetHostname(const nsAString& aHostname) {
+  MOZ_ASSERT(mURI);
+
+  // nsStandardURL returns NS_ERROR_UNEXPECTED for an empty hostname
+  // The return code is silently ignored
+  mozilla::Unused << NS_MutateURI(mURI)
+                         .SetHost(NS_ConvertUTF16toUTF8(aHostname))
+                         .Finalize(mURI);
+}
+
+void URL::GetPort(nsAString& aPort) const {
+  MOZ_ASSERT(mURI);
+
+  aPort.Truncate();
+
+  int32_t port;
+  nsresult rv = mURI->GetPort(&port);
+  if (NS_SUCCEEDED(rv) && port != -1) {
+    nsAutoString portStr;
+    portStr.AppendInt(port, 10);
+    aPort.Assign(portStr);
+  }
+}
+
+void URL::SetPort(const nsAString& aPort) {
+  nsresult rv;
+  nsAutoString portStr(aPort);
+  int32_t port = -1;
+
+  // nsIURI uses -1 as default value.
+  portStr.StripTaggedASCII(ASCIIMask::MaskCRLFTab());
+  if (!portStr.IsEmpty()) {
+    // To be valid, the port must start with an ASCII digit.
+    // (nsAString::ToInteger ignores leading junk, so check before calling.)
+    if (!IsAsciiDigit(portStr[0])) {
+      return;
+    }
+    port = portStr.ToInteger(&rv);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+  }
+
+  Unused << NS_MutateURI(mURI).SetPort(port).Finalize(mURI);
+}
+
+void URL::GetPathname(nsAString& aPathname) const {
+  MOZ_ASSERT(mURI);
+
+  aPathname.Truncate();
+
+  // Do not throw!  Not having a valid URI or URL should result in an empty
+  // string.
+
+  nsAutoCString file;
+  nsresult rv = mURI->GetFilePath(file);
+  if (NS_SUCCEEDED(rv)) {
+    CopyUTF8toUTF16(file, aPathname);
+  }
+}
+
+void URL::SetPathname(const nsAString& aPathname) {
+  MOZ_ASSERT(mURI);
+
+  // Do not throw!
+
+  Unused << NS_MutateURI(mURI)
+                .SetFilePath(NS_ConvertUTF16toUTF8(aPathname))
+                .Finalize(mURI);
+}
+
+void URL::GetSearch(nsAString& aSearch) const {
+  MOZ_ASSERT(mURI);
+
+  aSearch.Truncate();
+
+  // Do not throw!  Not having a valid URI or URL should result in an empty
+  // string.
+
+  nsAutoCString search;
+  nsresult rv;
+
+  rv = mURI->GetQuery(search);
+  if (NS_SUCCEEDED(rv) && !search.IsEmpty()) {
+    aSearch.Assign(u'?');
+    AppendUTF8toUTF16(search, aSearch);
+  }
+}
+
+void URL::GetHash(nsAString& aHash) const {
+  MOZ_ASSERT(mURI);
+
+  aHash.Truncate();
+
+  nsAutoCString ref;
+  nsresult rv = mURI->GetRef(ref);
+  if (NS_SUCCEEDED(rv) && !ref.IsEmpty()) {
+    aHash.Assign(char16_t('#'));
+    AppendUTF8toUTF16(ref, aHash);
+  }
+}
+
+void URL::SetHash(const nsAString& aHash) {
+  MOZ_ASSERT(mURI);
+
+  Unused
+      << NS_MutateURI(mURI).SetRef(NS_ConvertUTF16toUTF8(aHash)).Finalize(mURI);
+}
+
+void URL::SetSearchInternal(const nsAString& aSearch) {
+  MOZ_ASSERT(mURI);
+
+  // Ignore failures to be compatible with NS4.
+
+  Unused << NS_MutateURI(mURI)
+                .SetQuery(NS_ConvertUTF16toUTF8(aSearch))
+                .Finalize(mURI);
+}
+
+void URL::UpdateURLSearchParams() {
+  if (!mSearchParams) {
+    return;
+  }
+
+  nsAutoCString search;
+  nsresult rv = URI()->GetQuery(search);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    search.Truncate();
+  }
+
+  mSearchParams->ParseInput(search);
+}
+
+nsIURI* URL::URI() const {
+  MOZ_ASSERT(mURI);
+  return mURI;
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/url/URL.h b/dom/url/URL.h
new file mode 100644
index 0000000000..7c2563d095
--- /dev/null
+++ b/dom/url/URL.h
@@ -0,0 +1,147 @@
+/* -*- 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_URL_h
+#define mozilla_dom_URL_h
+
+#include "mozilla/dom/URLSearchParams.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIURI.h"
+#include "nsString.h"
+#include "nsWrapperCache.h"
+
+class nsISupports;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class Blob;
+class MediaSource;
+class GlobalObject;
+template <typename T>
+class Optional;
+
+class URL final : public URLSearchParamsObserver, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(URL)
+
+  explicit URL(nsISupports* aParent, nsCOMPtr<nsIURI> aURI)
+      : mParent(aParent), mURI(std::move(aURI)) {
+    MOZ_ASSERT(mURI);
+  }
+
+  // WebIDL methods
+  nsISupports* GetParentObject() const { return mParent; }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<URL> Constructor(const GlobalObject& aGlobal,
+                                           const nsAString& aURL,
+                                           const Optional<nsAString>& aBase,
+                                           ErrorResult& aRv);
+
+  static already_AddRefed<URL> Constructor(nsISupports* aParent,
+                                           const nsAString& aURL,
+                                           const nsAString& aBase,
+                                           ErrorResult& aRv);
+
+  static already_AddRefed<URL> Constructor(nsISupports* aParent,
+                                           const nsAString& aURL, nsIURI* aBase,
+                                           ErrorResult& aRv);
+
+  static void CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                              nsAString& aResult, ErrorResult& aRv);
+
+  static void CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                              nsAString& aResult, ErrorResult& aRv);
+
+  static void RevokeObjectURL(const GlobalObject& aGlobal,
+                              const nsAString& aURL, ErrorResult& aRv);
+
+  static bool IsValidObjectURL(const GlobalObject& aGlobal,
+                               const nsAString& aURL, ErrorResult& aRv);
+
+  static bool CanParse(const GlobalObject& aGlobal, const nsAString& aURL,
+                       const Optional<nsAString>& aBase);
+
+  void GetHref(nsAString& aHref) const;
+
+  void SetHref(const nsAString& aHref, ErrorResult& aRv);
+
+  void GetOrigin(nsAString& aOrigin) const;
+
+  void GetProtocol(nsAString& aProtocol) const;
+
+  void SetProtocol(const nsAString& aProtocol);
+
+  void GetUsername(nsAString& aUsername) const;
+
+  void SetUsername(const nsAString& aUsername);
+
+  void GetPassword(nsAString& aPassword) const;
+
+  void SetPassword(const nsAString& aPassword);
+
+  void GetHost(nsAString& aHost) const;
+
+  void SetHost(const nsAString& aHost);
+
+  void GetHostname(nsAString& aHostname) const;
+
+  void SetHostname(const nsAString& aHostname);
+
+  void GetPort(nsAString& aPort) const;
+
+  void SetPort(const nsAString& aPort);
+
+  void GetPathname(nsAString& aPathname) const;
+
+  void SetPathname(const nsAString& aPathname);
+
+  void GetSearch(nsAString& aSearch) const;
+
+  void SetSearch(const nsAString& aSearch);
+
+  URLSearchParams* SearchParams();
+
+  void GetHash(nsAString& aHost) const;
+
+  void SetHash(const nsAString& aHash);
+
+  void ToJSON(nsAString& aResult) const { GetHref(aResult); }
+
+  // URLSearchParamsObserver
+  void URLSearchParamsUpdated(URLSearchParams* aSearchParams) override;
+
+  nsIURI* URI() const;
+  static already_AddRefed<URL> FromURI(GlobalObject&, nsIURI*);
+
+ private:
+  ~URL() = default;
+
+  void UpdateURLSearchParams();
+
+ private:
+  void SetSearchInternal(const nsAString& aSearch);
+
+  void CreateSearchParamsIfNeeded();
+
+  nsCOMPtr<nsISupports> mParent;
+  RefPtr<URLSearchParams> mSearchParams;
+  nsCOMPtr<nsIURI> mURI;
+};
+
+bool IsChromeURI(nsIURI* aURI);
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif /* mozilla_dom_URL_h */
diff --git a/dom/url/URLMainThread.cpp b/dom/url/URLMainThread.cpp
new file mode 100644
index 0000000000..95afd0db45
--- /dev/null
+++ b/dom/url/URLMainThread.cpp
@@ -0,0 +1,133 @@
+/* -*- 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 "URLMainThread.h"
+
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/Blob.h"
+#include "mozilla/dom/BlobURLProtocolHandler.h"
+#include "mozilla/Unused.h"
+#include "nsContentUtils.h"
+#include "nsNetUtil.h"
+#include "nsThreadUtils.h"
+#include "mozilla/dom/Document.h"
+
+namespace mozilla::dom {
+
+/* static */
+void URLMainThread::CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                                    nsAString& aResult, ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  if (NS_WARN_IF(!global)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsAutoString partKey;
+  if (nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global)) {
+    if (Document* doc = owner->GetExtantDoc()) {
+      nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+          doc->CookieJarSettings();
+
+      cookieJarSettings->GetPartitionKey(partKey);
+    }
+  }
+
+  nsCOMPtr<nsIPrincipal> principal =
+      nsContentUtils::ObjectPrincipal(aGlobal.Get());
+
+  nsAutoCString url;
+  aRv = BlobURLProtocolHandler::AddDataEntry(
+      aBlob.Impl(), principal, NS_ConvertUTF16toUTF8(partKey), url);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  global->RegisterHostObjectURI(url);
+  CopyASCIItoUTF16(url, aResult);
+}
+
+/* static */
+void URLMainThread::CreateObjectURL(const GlobalObject& aGlobal,
+                                    MediaSource& aSource, nsAString& aResult,
+                                    ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  if (NS_WARN_IF(!global)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsAutoString partKey;
+  if (nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global)) {
+    if (Document* doc = owner->GetExtantDoc()) {
+      nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+          doc->CookieJarSettings();
+
+      cookieJarSettings->GetPartitionKey(partKey);
+    }
+  }
+
+  nsCOMPtr<nsIPrincipal> principal =
+      nsContentUtils::ObjectPrincipal(aGlobal.Get());
+
+  nsAutoCString url;
+  aRv = BlobURLProtocolHandler::AddDataEntry(
+      &aSource, principal, NS_ConvertUTF16toUTF8(partKey), url);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  nsCOMPtr<nsIRunnable> revocation = NS_NewRunnableFunction(
+      "dom::URLMainThread::CreateObjectURL",
+      [url] { BlobURLProtocolHandler::RemoveDataEntry(url); });
+
+  nsContentUtils::RunInStableState(revocation.forget());
+
+  CopyASCIItoUTF16(url, aResult);
+}
+
+/* static */
+void URLMainThread::RevokeObjectURL(const GlobalObject& aGlobal,
+                                    const nsAString& aURL, ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  if (!global) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsAutoString partKey;
+  if (nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global)) {
+    if (Document* doc = owner->GetExtantDoc()) {
+      nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+          doc->CookieJarSettings();
+
+      cookieJarSettings->GetPartitionKey(partKey);
+    }
+  }
+
+  NS_LossyConvertUTF16toASCII asciiurl(aURL);
+
+  if (BlobURLProtocolHandler::RemoveDataEntry(
+          asciiurl, nsContentUtils::ObjectPrincipal(aGlobal.Get()),
+          NS_ConvertUTF16toUTF8(partKey))) {
+    global->UnregisterHostObjectURI(asciiurl);
+  }
+}
+
+/* static */
+bool URLMainThread::IsValidObjectURL(const GlobalObject& aGlobal,
+                                     const nsAString& aURL, ErrorResult& aRv) {
+  MOZ_ASSERT(NS_IsMainThread());
+  NS_LossyConvertUTF16toASCII asciiurl(aURL);
+  return BlobURLProtocolHandler::HasDataEntry(asciiurl);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/url/URLMainThread.h b/dom/url/URLMainThread.h
new file mode 100644
index 0000000000..5314f2b3e0
--- /dev/null
+++ b/dom/url/URLMainThread.h
@@ -0,0 +1,31 @@
+/* -*- 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_URLMainThread_h
+#define mozilla_dom_URLMainThread_h
+
+#include "URL.h"
+
+namespace mozilla::dom {
+
+class URLMainThread final {
+ public:
+  static void CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                              nsAString& aResult, ErrorResult& aRv);
+
+  static void CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                              nsAString& aResult, ErrorResult& aRv);
+
+  static void RevokeObjectURL(const GlobalObject& aGlobal,
+                              const nsAString& aURL, ErrorResult& aRv);
+
+  static bool IsValidObjectURL(const GlobalObject& aGlobal,
+                               const nsAString& aURL, ErrorResult& aRv);
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_URLMainThread_h
diff --git a/dom/url/URLSearchParams.cpp b/dom/url/URLSearchParams.cpp
new file mode 100644
index 0000000000..d43217c8b6
--- /dev/null
+++ b/dom/url/URLSearchParams.cpp
@@ -0,0 +1,192 @@
+/* -*- 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/URLSearchParams.h"
+
+// XXX encoding_rs.h is not self-contained, this order is required
+#include "mozilla/Encoding.h"
+#include "encoding_rs.h"
+
+#include <new>
+#include <type_traits>
+#include <utility>
+#include "js/StructuredClone.h"
+#include "mozilla/ArrayIterator.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/MacroForEach.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/Record.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "mozilla/dom/URLSearchParamsBinding.h"
+#include "mozilla/fallible.h"
+#include "nsDOMString.h"
+#include "nsError.h"
+#include "nsIGlobalObject.h"
+#include "nsLiteralString.h"
+#include "nsPrintfCString.h"
+#include "nsString.h"
+#include "nsStringFlags.h"
+#include "nsStringIterator.h"
+#include "nsStringStream.h"
+#include "nsURLHelper.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(URLSearchParams, mParent, mObserver)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(URLSearchParams)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(URLSearchParams)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(URLSearchParams)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+URLSearchParams::URLSearchParams(nsISupports* aParent,
+                                 URLSearchParamsObserver* aObserver)
+    : mParams(new URLParams()), mParent(aParent), mObserver(aObserver) {}
+
+URLSearchParams::~URLSearchParams() { DeleteAll(); }
+
+JSObject* URLSearchParams::WrapObject(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return URLSearchParams_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */
+already_AddRefed<URLSearchParams> URLSearchParams::Constructor(
+    const GlobalObject& aGlobal,
+    const USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString& aInit,
+    ErrorResult& aRv) {
+  RefPtr<URLSearchParams> sp =
+      new URLSearchParams(aGlobal.GetAsSupports(), nullptr);
+
+  if (aInit.IsUSVString()) {
+    NS_ConvertUTF16toUTF8 input(aInit.GetAsUSVString());
+    if (StringBeginsWith(input, "?"_ns)) {
+      sp->ParseInput(Substring(input, 1, input.Length() - 1));
+    } else {
+      sp->ParseInput(input);
+    }
+  } else if (aInit.IsUSVStringSequenceSequence()) {
+    const Sequence<Sequence<nsString>>& list =
+        aInit.GetAsUSVStringSequenceSequence();
+    for (uint32_t i = 0; i < list.Length(); ++i) {
+      const Sequence<nsString>& item = list[i];
+      if (item.Length() != 2) {
+        nsPrintfCString err("Expected 2 items in pair but got %zu",
+                            item.Length());
+        aRv.ThrowTypeError(err);
+        return nullptr;
+      }
+      sp->Append(item[0], item[1]);
+    }
+  } else if (aInit.IsUSVStringUSVStringRecord()) {
+    const Record<nsString, nsString>& record =
+        aInit.GetAsUSVStringUSVStringRecord();
+    for (auto& entry : record.Entries()) {
+      sp->Append(entry.mKey, entry.mValue);
+    }
+  } else {
+    MOZ_CRASH("This should not happen.");
+  }
+
+  return sp.forget();
+}
+
+void URLSearchParams::ParseInput(const nsACString& aInput) {
+  mParams->ParseInput(aInput);
+}
+
+uint32_t URLSearchParams::Size() const { return mParams->Length(); }
+
+void URLSearchParams::Get(const nsAString& aName, nsString& aRetval) {
+  return mParams->Get(aName, aRetval);
+}
+
+void URLSearchParams::GetAll(const nsAString& aName,
+                             nsTArray<nsString>& aRetval) {
+  return mParams->GetAll(aName, aRetval);
+}
+
+void URLSearchParams::Set(const nsAString& aName, const nsAString& aValue) {
+  mParams->Set(aName, aValue);
+  NotifyObserver();
+}
+
+void URLSearchParams::Append(const nsAString& aName, const nsAString& aValue) {
+  mParams->Append(aName, aValue);
+  NotifyObserver();
+}
+
+bool URLSearchParams::Has(const nsAString& aName,
+                          const Optional<nsAString>& aValue) {
+  if (!aValue.WasPassed()) {
+    return mParams->Has(aName);
+  }
+  return mParams->Has(aName, aValue.Value());
+}
+
+void URLSearchParams::Delete(const nsAString& aName,
+                             const Optional<nsAString>& aValue) {
+  if (!aValue.WasPassed()) {
+    mParams->Delete(aName);
+    NotifyObserver();
+    return;
+  }
+  mParams->Delete(aName, aValue.Value());
+  NotifyObserver();
+}
+
+void URLSearchParams::DeleteAll() { mParams->DeleteAll(); }
+
+void URLSearchParams::Serialize(nsAString& aValue) const {
+  mParams->Serialize(aValue, true);
+}
+
+void URLSearchParams::NotifyObserver() {
+  if (mObserver) {
+    mObserver->URLSearchParamsUpdated(this);
+  }
+}
+
+uint32_t URLSearchParams::GetIterableLength() const {
+  return mParams->Length();
+}
+
+const nsAString& URLSearchParams::GetKeyAtIndex(uint32_t aIndex) const {
+  return mParams->GetKeyAtIndex(aIndex);
+}
+
+const nsAString& URLSearchParams::GetValueAtIndex(uint32_t aIndex) const {
+  return mParams->GetValueAtIndex(aIndex);
+}
+
+void URLSearchParams::Sort(ErrorResult& aRv) {
+  mParams->Sort();
+  NotifyObserver();
+}
+
+// contentTypeWithCharset can be set to the contentType or
+// contentType+charset based on what the spec says.
+// See: https://fetch.spec.whatwg.org/#concept-bodyinit-extract
+nsresult URLSearchParams::GetSendInfo(nsIInputStream** aBody,
+                                      uint64_t* aContentLength,
+                                      nsACString& aContentTypeWithCharset,
+                                      nsACString& aCharset) const {
+  aContentTypeWithCharset.AssignLiteral(
+      "application/x-www-form-urlencoded;charset=UTF-8");
+  aCharset.AssignLiteral("UTF-8");
+
+  nsAutoString serialized;
+  Serialize(serialized);
+  NS_ConvertUTF16toUTF8 converted(serialized);
+  *aContentLength = converted.Length();
+  return NS_NewCStringInputStream(aBody, std::move(converted));
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/url/URLSearchParams.h b/dom/url/URLSearchParams.h
new file mode 100644
index 0000000000..9ddff1e512
--- /dev/null
+++ b/dom/url/URLSearchParams.h
@@ -0,0 +1,118 @@
+/* -*- 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_URLSearchParams_h
+#define mozilla_dom_URLSearchParams_h
+
+#include <cstdint>
+#include "ErrorList.h"
+#include "js/RootingAPI.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupports.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+
+class JSObject;
+class nsIGlobalObject;
+class nsIInputStream;
+struct JSContext;
+struct JSStructuredCloneReader;
+struct JSStructuredCloneWriter;
+
+namespace mozilla {
+
+class ErrorResult;
+class URLParams;
+
+namespace dom {
+
+class GlobalObject;
+class URLSearchParams;
+class USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString;
+template <typename T>
+class Optional;
+
+class URLSearchParamsObserver : public nsISupports {
+ public:
+  virtual ~URLSearchParamsObserver() = default;
+
+  virtual void URLSearchParamsUpdated(URLSearchParams* aFromThis) = 0;
+};
+
+class URLSearchParams final : public nsISupports, public nsWrapperCache {
+  ~URLSearchParams();
+
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(URLSearchParams)
+
+  explicit URLSearchParams(nsISupports* aParent,
+                           URLSearchParamsObserver* aObserver = nullptr);
+
+  // WebIDL methods
+  nsISupports* GetParentObject() const { return mParent; }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<URLSearchParams> Constructor(
+      const GlobalObject& aGlobal,
+      const USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString&
+          aInit,
+      ErrorResult& aRv);
+
+  void ParseInput(const nsACString& aInput);
+
+  void Serialize(nsAString& aValue) const;
+
+  uint32_t Size() const;
+
+  void Get(const nsAString& aName, nsString& aRetval);
+
+  void GetAll(const nsAString& aName, nsTArray<nsString>& aRetval);
+
+  void Set(const nsAString& aName, const nsAString& aValue);
+
+  void Append(const nsAString& aName, const nsAString& aValue);
+
+  bool Has(const nsAString& aName, const Optional<nsAString>& aValue);
+
+  void Delete(const nsAString& aName, const Optional<nsAString>& aValue);
+
+  uint32_t GetIterableLength() const;
+  const nsAString& GetKeyAtIndex(uint32_t aIndex) const;
+  const nsAString& GetValueAtIndex(uint32_t aIndex) const;
+
+  void Sort(ErrorResult& aRv);
+
+  void Stringify(nsString& aRetval) const { Serialize(aRetval); }
+
+  nsresult GetSendInfo(nsIInputStream** aBody, uint64_t* aContentLength,
+                       nsACString& aContentTypeWithCharset,
+                       nsACString& aCharset) const;
+
+ private:
+  void AppendInternal(const nsAString& aName, const nsAString& aValue);
+
+  void DeleteAll();
+
+  void NotifyObserver();
+
+  UniquePtr<URLParams> mParams;
+  nsCOMPtr<nsISupports> mParent;
+  RefPtr<URLSearchParamsObserver> mObserver;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif /* mozilla_dom_URLSearchParams_h */
diff --git a/dom/url/URLWorker.cpp b/dom/url/URLWorker.cpp
new file mode 100644
index 0000000000..e4ae3d6248
--- /dev/null
+++ b/dom/url/URLWorker.cpp
@@ -0,0 +1,171 @@
+/* -*- 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 "URLWorker.h"
+
+#include "mozilla/dom/Blob.h"
+#include "mozilla/dom/BlobImpl.h"
+#include "mozilla/dom/BlobURLProtocolHandler.h"
+#include "mozilla/dom/WorkerRunnable.h"
+#include "mozilla/dom/WorkerScope.h"
+
+namespace mozilla::dom {
+
+// This class creates an URL from a DOM Blob on the main thread.
+class CreateURLRunnable : public WorkerMainThreadRunnable {
+ private:
+  BlobImpl* mBlobImpl;
+  nsAString& mURL;
+
+ public:
+  CreateURLRunnable(WorkerPrivate* aWorkerPrivate, BlobImpl* aBlobImpl,
+                    nsAString& aURL)
+      : WorkerMainThreadRunnable(aWorkerPrivate, "URL :: CreateURL"_ns),
+        mBlobImpl(aBlobImpl),
+        mURL(aURL) {
+    MOZ_ASSERT(aBlobImpl);
+  }
+
+  bool MainThreadRun() override {
+    using namespace mozilla::ipc;
+
+    AssertIsOnMainThread();
+
+    nsCOMPtr<nsIPrincipal> principal = mWorkerPrivate->GetPrincipal();
+
+    nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+        mWorkerPrivate->CookieJarSettings();
+
+    nsAutoString partKey;
+    cookieJarSettings->GetPartitionKey(partKey);
+
+    nsAutoCString url;
+    nsresult rv = BlobURLProtocolHandler::AddDataEntry(
+        mBlobImpl, principal, NS_ConvertUTF16toUTF8(partKey), url);
+
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Failed to add data entry for the blob!");
+      SetDOMStringToNull(mURL);
+      return false;
+    }
+
+    CopyUTF8toUTF16(url, mURL);
+    return true;
+  }
+};
+
+// This class revokes an URL on the main thread.
+class RevokeURLRunnable : public WorkerMainThreadRunnable {
+ private:
+  const nsString mURL;
+
+ public:
+  RevokeURLRunnable(WorkerPrivate* aWorkerPrivate, const nsAString& aURL)
+      : WorkerMainThreadRunnable(aWorkerPrivate, "URL :: RevokeURL"_ns),
+        mURL(aURL) {}
+
+  bool MainThreadRun() override {
+    AssertIsOnMainThread();
+
+    NS_ConvertUTF16toUTF8 url(mURL);
+
+    nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
+        mWorkerPrivate->CookieJarSettings();
+
+    nsAutoString partKey;
+    cookieJarSettings->GetPartitionKey(partKey);
+
+    BlobURLProtocolHandler::RemoveDataEntry(url, mWorkerPrivate->GetPrincipal(),
+                                            NS_ConvertUTF16toUTF8(partKey));
+    return true;
+  }
+};
+
+// This class checks if an URL is valid on the main thread.
+class IsValidURLRunnable : public WorkerMainThreadRunnable {
+ private:
+  const nsString mURL;
+  bool mValid;
+
+ public:
+  IsValidURLRunnable(WorkerPrivate* aWorkerPrivate, const nsAString& aURL)
+      : WorkerMainThreadRunnable(aWorkerPrivate, "URL :: IsValidURL"_ns),
+        mURL(aURL),
+        mValid(false) {}
+
+  bool MainThreadRun() override {
+    AssertIsOnMainThread();
+
+    NS_ConvertUTF16toUTF8 url(mURL);
+    mValid = BlobURLProtocolHandler::HasDataEntry(url);
+
+    return true;
+  }
+
+  bool IsValidURL() const { return mValid; }
+};
+
+/* static */
+void URLWorker::CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                                nsAString& aResult, mozilla::ErrorResult& aRv) {
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<BlobImpl> blobImpl = aBlob.Impl();
+  MOZ_ASSERT(blobImpl);
+
+  RefPtr<CreateURLRunnable> runnable =
+      new CreateURLRunnable(workerPrivate, blobImpl, aResult);
+
+  runnable->Dispatch(Canceling, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  WorkerGlobalScope* scope = workerPrivate->GlobalScope();
+  MOZ_ASSERT(scope);
+
+  scope->RegisterHostObjectURI(NS_ConvertUTF16toUTF8(aResult));
+}
+
+/* static */
+void URLWorker::RevokeObjectURL(const GlobalObject& aGlobal,
+                                const nsAString& aUrl, ErrorResult& aRv) {
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<RevokeURLRunnable> runnable =
+      new RevokeURLRunnable(workerPrivate, aUrl);
+
+  runnable->Dispatch(Canceling, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  WorkerGlobalScope* scope = workerPrivate->GlobalScope();
+  MOZ_ASSERT(scope);
+
+  scope->UnregisterHostObjectURI(NS_ConvertUTF16toUTF8(aUrl));
+}
+
+/* static */
+bool URLWorker::IsValidObjectURL(const GlobalObject& aGlobal,
+                                 const nsAString& aUrl, ErrorResult& aRv) {
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<IsValidURLRunnable> runnable =
+      new IsValidURLRunnable(workerPrivate, aUrl);
+
+  runnable->Dispatch(Canceling, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return false;
+  }
+
+  return runnable->IsValidURL();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/url/URLWorker.h b/dom/url/URLWorker.h
new file mode 100644
index 0000000000..be8ab512a1
--- /dev/null
+++ b/dom/url/URLWorker.h
@@ -0,0 +1,45 @@
+/* -*- 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_URLWorker_h
+#define mozilla_dom_URLWorker_h
+
+#include "URL.h"
+#include "URLMainThread.h"
+
+namespace mozilla {
+
+namespace net {
+class nsStandardURL;
+}
+
+namespace dom {
+
+class URLWorker final {
+ public:
+  static already_AddRefed<URLWorker> Constructor(
+      const GlobalObject& aGlobal, const nsAString& aURL,
+      const Optional<nsAString>& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLWorker> Constructor(const GlobalObject& aGlobal,
+                                                 const nsAString& aURL,
+                                                 const nsAString& aBase,
+                                                 ErrorResult& aRv);
+
+  static void CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                              nsAString& aResult, mozilla::ErrorResult& aRv);
+
+  static void RevokeObjectURL(const GlobalObject& aGlobal,
+                              const nsAString& aUrl, ErrorResult& aRv);
+
+  static bool IsValidObjectURL(const GlobalObject& aGlobal,
+                               const nsAString& aUrl, ErrorResult& aRv);
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_URLWorker_h
diff --git a/dom/url/moz.build b/dom/url/moz.build
new file mode 100644
index 0000000000..6e714a7374
--- /dev/null
+++ b/dom/url/moz.build
@@ -0,0 +1,35 @@
+# -*- 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: Networking")
+
+EXPORTS.mozilla.dom += [
+    "URL.h",
+    "URLSearchParams.h",
+]
+
+UNIFIED_SOURCES += [
+    "URL.cpp",
+    "URLMainThread.cpp",
+    "URLSearchParams.cpp",
+    "URLWorker.cpp",
+]
+
+LOCAL_INCLUDES += [
+    "/netwerk/base",
+]
+
+MOCHITEST_MANIFESTS += ["tests/mochitest.toml"]
+MOCHITEST_CHROME_MANIFESTS += ["tests/chrome.toml"]
+BROWSER_CHROME_MANIFESTS += ["tests/browser.toml"]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+
+# Add libFuzzer configuration directives
+include("/tools/fuzzing/libfuzzer-config.mozbuild")
diff --git a/dom/url/tests/browser.toml b/dom/url/tests/browser.toml
new file mode 100644
index 0000000000..4abf1f4f0f
--- /dev/null
+++ b/dom/url/tests/browser.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+support-files = ["empty.html"]
+
+["browser_download_after_revoke.js"]
diff --git a/dom/url/tests/browser_download_after_revoke.js b/dom/url/tests/browser_download_after_revoke.js
new file mode 100644
index 0000000000..be8ad96e70
--- /dev/null
+++ b/dom/url/tests/browser_download_after_revoke.js
@@ -0,0 +1,94 @@
+async function test() {
+  waitForExplicitFinish();
+  const target = "http://example.com/browser/dom/url/tests/empty.html";
+  info("Loading download page...");
+  let tab = BrowserTestUtils.addTab(gBrowser, target);
+  registerCleanupFunction(function () {
+    gBrowser.removeTab(tab);
+    window.restore();
+  });
+  gBrowser.selectedTab = tab;
+  BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, target).then(
+    async () => {
+      info("Page loaded.");
+      let allDownloads = await Downloads.getList(Downloads.ALL);
+      let started = new Promise(resolve => {
+        if (
+          Services.prefs.getBoolPref(
+            "browser.download.always_ask_before_handling_new_types",
+            false
+          )
+        ) {
+          // If the download modal is enabled, wait for it to open and declare the
+          // download to have begun when we see it.
+          let listener = {
+            onOpenWindow(aXULWindow) {
+              info("Download modal shown...");
+              Services.wm.removeListener(listener);
+
+              let domwindow = aXULWindow.docShell.domWindow;
+              function onModalLoad() {
+                domwindow.removeEventListener("load", onModalLoad, true);
+
+                is(
+                  domwindow.document.location.href,
+                  "chrome://mozapps/content/downloads/unknownContentType.xhtml",
+                  "Download modal loaded..."
+                );
+
+                domwindow.close();
+                info("Download modal closed.");
+                resolve();
+              }
+
+              domwindow.addEventListener("load", onModalLoad, true);
+            },
+            onCloseWindow(aXULWindow) {},
+          };
+
+          Services.wm.addListener(listener);
+        } else {
+          // With no download modal, the download will begin on its own, so we need
+          // to wait to be notified by the downloads list when that happens.
+          let downloadView = {
+            onDownloadAdded(download) {
+              ok(true, "Download was started.");
+              download.cancel();
+              allDownloads.removeView(this);
+              allDownloads.removeFinished();
+              resolve();
+            },
+          };
+          allDownloads.addView(downloadView);
+        }
+      });
+
+      let revoked = SpecialPowers.spawn(
+        tab.linkedBrowser,
+        [],
+        () =>
+          new Promise(resolve => {
+            info("Creating BlobURL...");
+            let blob = new content.Blob(["test"], { type: "text/plain" });
+            let url = content.URL.createObjectURL(blob);
+
+            let link = content.document.createElement("a");
+            link.href = url;
+            link.download = "example.txt";
+            content.document.body.appendChild(link);
+            info("Clicking HTMLAnchorElement...");
+            link.click();
+
+            content.URL.revokeObjectURL(url);
+            info("BlobURL revoked.");
+            resolve();
+          })
+      );
+
+      info("Waiting for async activities...");
+      await Promise.all([revoked, started]);
+      ok(true, "Exiting test.");
+      finish();
+    }
+  );
+}
diff --git a/dom/url/tests/chrome.toml b/dom/url/tests/chrome.toml
new file mode 100644
index 0000000000..874477331d
--- /dev/null
+++ b/dom/url/tests/chrome.toml
@@ -0,0 +1,15 @@
+[DEFAULT]
+skip-if = ["os == 'android'"]
+support-files = [
+  "file_url.jsm",
+  "file_worker_url.jsm",
+  "test_bug883784.jsm",
+  "jsm_url_worker.js",
+  "!/dom/workers/test/dom_worker_helper.js",
+]
+
+["test_bug883784.xhtml"]
+
+["test_url.xhtml"]
+
+["test_worker_url.xhtml"]
diff --git a/dom/url/tests/empty.html b/dom/url/tests/empty.html
new file mode 100644
index 0000000000..358db717dd
--- /dev/null
+++ b/dom/url/tests/empty.html
@@ -0,0 +1,2 @@
+<!DOCTYPE HTML>
+<html><body></body></html>
diff --git a/dom/url/tests/file_url.jsm b/dom/url/tests/file_url.jsm
new file mode 100644
index 0000000000..6be99f2931
--- /dev/null
+++ b/dom/url/tests/file_url.jsm
@@ -0,0 +1,24 @@
+var EXPORTED_SYMBOLS = ["checkFromJSM"];
+
+function checkFromJSM(ok, is) {
+  var url = new URL("http://www.example.com");
+  is(url.href, "http://www.example.com/", "JSM should have URL");
+
+  var url2 = new URL("/foobar", url);
+  is(
+    url2.href,
+    "http://www.example.com/foobar",
+    "JSM should have URL - based on another URL"
+  );
+
+  var blob = new Blob(["a"]);
+  url = URL.createObjectURL(blob);
+  ok(url, "URL is created!");
+
+  var u = new URL(url);
+  ok(u, "URL created");
+  is(u.origin, "null", "Url doesn't have an origin if created in a JSM");
+
+  URL.revokeObjectURL(url);
+  ok(true, "URL is revoked");
+}
diff --git a/dom/url/tests/file_worker_url.jsm b/dom/url/tests/file_worker_url.jsm
new file mode 100644
index 0000000000..30a072ef9d
--- /dev/null
+++ b/dom/url/tests/file_worker_url.jsm
@@ -0,0 +1,23 @@
+var EXPORTED_SYMBOLS = ["checkFromJSM"];
+
+function checkFromJSM(ok, is, finish) {
+  let worker = new ChromeWorker("jsm_url_worker.js");
+  worker.onmessage = function (event) {
+    if (event.data.type == "finish") {
+      finish();
+    } else if (event.data.type == "url") {
+      URL.revokeObjectURL(event.data.url);
+    } else if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function (event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.data);
+    worker.terminate();
+    finish();
+  };
+
+  worker.postMessage(0);
+}
diff --git a/dom/url/tests/jsm_url_worker.js b/dom/url/tests/jsm_url_worker.js
new file mode 100644
index 0000000000..d4cabe4113
--- /dev/null
+++ b/dom/url/tests/jsm_url_worker.js
@@ -0,0 +1,84 @@
+/* eslint-env worker */
+
+onmessage = function (event) {
+  if (event.data != 0) {
+    var worker = new Worker("jsm_url_worker.js");
+    worker.onmessage = function (ev) {
+      postMessage(ev.data);
+    };
+
+    worker.postMessage(event.data - 1);
+    return;
+  }
+
+  let status = false;
+  try {
+    if (URL instanceof Object) {
+      status = true;
+    }
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "URL object:" + URL });
+
+  status = false;
+  var blob = null;
+  try {
+    blob = new Blob([]);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob:" + blob });
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob URL:" + url });
+
+  status = false;
+  try {
+    URL.revokeObjectURL(url);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob Revoke URL" });
+
+  status = false;
+  url = null;
+  try {
+    url = URL.createObjectURL(true);
+  } catch (e) {
+    status = true;
+  }
+
+  postMessage({
+    type: "status",
+    status,
+    msg: "CreateObjectURL should fail if the arg is not a blob",
+  });
+
+  status = false;
+  url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob URL2:" + url });
+
+  status = false;
+  try {
+    URL.createObjectURL({});
+  } catch (e) {
+    status = true;
+  }
+
+  postMessage({ type: "status", status, msg: "Exception wanted" });
+
+  postMessage({ type: "url", url });
+
+  postMessage({ type: "finish" });
+};
diff --git a/dom/url/tests/mochitest.toml b/dom/url/tests/mochitest.toml
new file mode 100644
index 0000000000..5a570484d9
--- /dev/null
+++ b/dom/url/tests/mochitest.toml
@@ -0,0 +1,41 @@
+[DEFAULT]
+support-files = [
+  "url_worker.js",
+  "urlApi_worker.js",
+  "urlSearchParams_commons.js",
+  "urlSearchParams_worker.js",
+  "url_exceptions_worker.js",
+]
+
+["test_bloburl_location.html"]
+
+["test_unknown_url_origin.html"]
+
+["test_url.html"]
+
+["test_urlExceptions.html"]
+
+["test_urlSearchParams.html"]
+
+["test_urlSearchParams_sorting.html"]
+
+["test_urlSearchParams_utf8.html"]
+
+["test_url_data.html"]
+
+["test_url_empty_port.html"]
+
+["test_url_malformedHost.html"]
+
+["test_urlutils_stringify.html"]
+
+["test_worker_protocol.html"]
+support-files = ["protocol_worker.js"]
+
+["test_worker_url.html"]
+
+["test_worker_urlApi.html"]
+
+["test_worker_urlSearchParams.html"]
+
+["test_worker_url_exceptions.html"]
diff --git a/dom/url/tests/protocol_worker.js b/dom/url/tests/protocol_worker.js
new file mode 100644
index 0000000000..c038254a4c
--- /dev/null
+++ b/dom/url/tests/protocol_worker.js
@@ -0,0 +1,25 @@
+function ok(a, msg) {
+  postMessage({ type: "status", status: !!a, msg });
+}
+
+function is(a, b, msg) {
+  ok(a === b, msg);
+}
+
+function finish() {
+  postMessage({ type: "finish" });
+}
+
+let url = new URL("http://example.com");
+is(url.protocol, "http:", "http: expected");
+
+url.protocol = "https:";
+is(url.protocol, "https:", "http: -> https:");
+
+url.protocol = "ftp:";
+is(url.protocol, "ftp:", "https: -> ftp:");
+
+url.protocol = "https:";
+is(url.protocol, "https:", "ftp: -> https:");
+
+finish();
diff --git a/dom/url/tests/test_bloburl_location.html b/dom/url/tests/test_bloburl_location.html
new file mode 100644
index 0000000000..a20229bd9a
--- /dev/null
+++ b/dom/url/tests/test_bloburl_location.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for blobURL in location</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <script type="application/javascript">
+
+var expectedData = null;
+onmessage = function(e) {
+  if (expectedData === null) {
+    expectedData = e.data;
+  } else {
+    is(e.data, expectedData, "Pathname should be not be changed");
+    SimpleTest.finish();
+  }
+};
+
+
+var ifr = document.createElement("iframe");
+document.body.appendChild(ifr);
+
+ifr.src = "data:text/html,<script>location=URL.createObjectURL(new%20Blob(['<script>parent.postMessage(location.pathname,\"*\");location.pathname=\"foo\";parent.postMessage(location.pathname,\"*\");<\/s' +'cript>'], {type:\"text/html\"}));<\/script>";
+
+SimpleTest.waitForExplicitFinish();
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_bug883784.jsm b/dom/url/tests/test_bug883784.jsm
new file mode 100644
index 0000000000..1790007680
--- /dev/null
+++ b/dom/url/tests/test_bug883784.jsm
@@ -0,0 +1,38 @@
+var EXPORTED_SYMBOLS = ["Test"];
+
+var Test = {
+  start(ok, is, finish) {
+    let worker = new ChromeWorker("jsm_url_worker.js");
+    worker.onmessage = function (event) {
+      if (event.data.type == "status") {
+        ok(event.data.status, event.data.msg);
+      } else if (event.data.type == "url") {
+        var xhr = new XMLHttpRequest();
+        xhr.open("GET", event.data.url, false);
+        xhr.onreadystatechange = function () {
+          if (xhr.readyState == 4) {
+            ok(true, "Blob readable!");
+            URL.revokeObjectURL(event.data.url);
+            finish();
+          }
+        };
+        xhr.onerror = function () {
+          ok(false, "Blob unreadable, should not happen!");
+          URL.revokeObjectURL(event.data.url);
+          finish();
+        };
+        xhr.send();
+      }
+    };
+
+    var self = this;
+    worker.onerror = function (event) {
+      is(event.target, worker);
+      ok(false, "Worker had an error: " + event.data);
+      self.worker.terminate();
+      finish();
+    };
+
+    worker.postMessage(0);
+  },
+};
diff --git a/dom/url/tests/test_bug883784.xhtml b/dom/url/tests/test_bug883784.xhtml
new file mode 100644
index 0000000000..381eb08a37
--- /dev/null
+++ b/dom/url/tests/test_bug883784.xhtml
@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="DOM Worker Threads Test"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"/>
+  <script type="application/javascript" src="chrome://mochitests/content/chrome/dom/workers/test/dom_worker_helper.js"/>
+
+  <script type="application/javascript">
+  <![CDATA[
+    /* import-globals-from ../../workers/test/dom_worker_helper.js */
+    function test()
+    {
+      waitForWorkerFinish();
+
+      const {Test} = ChromeUtils.import("chrome://mochitests/content/chrome/dom/url/tests/test_bug883784.jsm");
+      Test.start(ok, is, 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>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/url/tests/test_unknown_url_origin.html b/dom/url/tests/test_unknown_url_origin.html
new file mode 100644
index 0000000000..1c5571e9e4
--- /dev/null
+++ b/dom/url/tests/test_unknown_url_origin.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for unknwon URL.origin</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <script type="application/javascript">
+
+  is((new URL("blob:http://foo.com/bar")).origin, "http://foo.com");
+  is((new URL("blob:blob:http://foo.com/bar")).origin, "http://foo.com");
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url.html b/dom/url/tests/test_url.html
new file mode 100644
index 0000000000..5b4f00d692
--- /dev/null
+++ b/dom/url/tests/test_url.html
@@ -0,0 +1,517 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test URL API</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=887364">Mozilla Bug 887364</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=991471">Mozilla Bug 991471</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=996055">Mozilla Bug 996055</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <script>
+
+  /** Test for Bug 887364 **/
+  ok("URL" in window, "window.URL exists");
+
+  var tests = [
+    { url: "http://www.abc.com",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/",
+      origin: "http://www.abc.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/",
+      search: "",
+      hash: "",
+    },
+    { url: "ftp://auser:apw@www.abc.com",
+      base: undefined,
+      error: false,
+      href: "ftp://auser:apw@www.abc.com/",
+      origin: "ftp://www.abc.com",
+      protocol: "ftp:",
+      username: "auser",
+      password: "apw",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/",
+      search: "",
+      hash: "",
+    },
+    { url: "http://www.abc.com:90/apath/",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com:90/apath/",
+      origin: "http://www.abc.com:90",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com:90",
+      hostname: "www.abc.com",
+      port: "90",
+      pathname: "/apath/",
+      search: "",
+      hash: "",
+    },
+    { url: "http://www.abc.com/apath/afile.txt#ahash",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt#ahash",
+      origin: "http://www.abc.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/apath/afile.txt",
+      search: "",
+      hash: "#ahash",
+    },
+    { url: "http://example.com/?test#hash",
+      base: undefined,
+      error: false,
+      href: "http://example.com/?test#hash",
+      origin: "http://example.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "example.com",
+      hostname: "example.com",
+      port: "",
+      pathname: "/",
+      search: "?test",
+      hash: "#hash",
+    },
+    { url: "http://example.com/?test",
+      base: undefined,
+      error: false,
+      href: "http://example.com/?test",
+      origin: "http://example.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "example.com",
+      hostname: "example.com",
+      port: "",
+      pathname: "/",
+      search: "?test",
+      hash: "",
+    },
+    { url: "http://example.com/carrot#question%3f",
+      base: undefined,
+      error: false,
+      hash: "#question%3f",
+    },
+    { url: "https://example.com:4443?",
+      base: undefined,
+      error: false,
+      protocol: "https:",
+      port: "4443",
+      pathname: "/",
+      hash: "",
+      search: "",
+    },
+    { url: "http://www.abc.com/apath/afile.txt#ahash?asearch",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt#ahash?asearch",
+      protocol: "http:",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash?asearch",
+      search: "",
+    },
+    { url: "http://www.abc.com/apath/afile.txt?asearch#ahash",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt?asearch#ahash",
+      protocol: "http:",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "?asearch",
+    },
+    { url: "http://abc.com/apath/afile.txt?#ahash",
+      base: undefined,
+      error: false,
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "",
+    },
+    { url: "http://auser:apassword@www.abc.com:90/apath/afile.txt?asearch#ahash",
+      base: undefined,
+      error: false,
+      protocol: "http:",
+      username: "auser",
+      password: "apassword",
+      host: "www.abc.com:90",
+      hostname: "www.abc.com",
+      port: "90",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "?asearch",
+      origin: "http://www.abc.com:90",
+    },
+
+    { url: "/foo#bar",
+      base: "www.test.org",
+      error: true,
+    },
+    { url: "/foo#bar",
+      base: null,
+      error: true,
+    },
+    { url: "/foo#bar",
+      base: 42,
+      error: true,
+    },
+    { url: "ftp://ftp.something.net",
+      base: undefined,
+      error: false,
+      protocol: "ftp:",
+    },
+    { url: "file:///tmp/file",
+      base: undefined,
+      error: false,
+      protocol: "file:",
+    },
+    { url: "gopher://gopher.something.net",
+      base: undefined,
+      error: false,
+      protocol: "gopher:",
+      expectedChangedProtocol: "https:",
+    },
+    { url: "ws://ws.something.net",
+      base: undefined,
+      error: false,
+      protocol: "ws:",
+    },
+    { url: "wss://ws.something.net",
+      base: undefined,
+      error: false,
+      protocol: "wss:",
+    },
+    { url: "foo://foo.something.net",
+      base: undefined,
+      error: false,
+      protocol: "foo:",
+      expectedChangedProtocol: "https:",
+    },
+
+    { url: "about:blank",
+      base: undefined,
+      error: false,
+      protocol: "about:",
+      pathname: "blank",
+      skip_setters: false,
+    },
+
+    { url: "foo:bar?what#yeah",
+      base: undefined,
+      error: false,
+      protocol: "foo:",
+      pathname: "bar",
+      search: "?what",
+      hash: "#yeah",
+      skip_setters: false,
+    },
+
+    { url: "http://sub2.xn--lt-uia.mochi.test:8888/foo",
+      base: undefined,
+      error: false,
+      href: "http://sub2.xn--lt-uia.mochi.test:8888/foo",
+      origin: "http://sub2.xn--lt-uia.mochi.test:8888",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "sub2.xn--lt-uia.mochi.test:8888",
+      hostname: "sub2.xn--lt-uia.mochi.test",
+      port: "8888",
+      pathname: "/foo",
+      search: "",
+      hash: "",
+    },
+    { url: "http://sub2.ält.mochi.test:8888/foo",
+      base: undefined,
+      error: false,
+      href: "http://sub2.xn--lt-uia.mochi.test:8888/foo",
+      origin: "http://sub2.xn--lt-uia.mochi.test:8888",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "sub2.xn--lt-uia.mochi.test:8888",
+      hostname: "sub2.xn--lt-uia.mochi.test",
+      port: "8888",
+      pathname: "/foo",
+      search: "",
+      hash: "",
+    },
+  ];
+
+  while (tests.length) {
+    var test = tests.shift();
+
+    var error = false;
+    var url;
+    try {
+      if (test.base) {
+        url = new URL(test.url, test.base);
+      } else {
+        url = new URL(test.url);
+      }
+    } catch (e) {
+      error = true;
+    }
+
+    is(test.error, error, "Error creating URL");
+    if (test.error) {
+      continue;
+    }
+
+    if ("href" in test) is(url.href, test.href, "href");
+    if ("origin" in test) is(url.origin, test.origin, "origin");
+    if ("protocol" in test) is(url.protocol, test.protocol, "protocol");
+    if ("username" in test) is(url.username, test.username, "username");
+    if ("password" in test) is(url.password, test.password, "password");
+    if ("host" in test) is(url.host, test.host, "host");
+    if ("hostname" in test) is(url.hostname, test.hostname, "hostname");
+    if ("port" in test) is(url.port, test.port, "port");
+    if ("pathname" in test) is(url.pathname, test.pathname, "pathname");
+    if ("search" in test) is(url.search, test.search, "search");
+    if ("hash" in test) is(url.hash, test.hash, "hash");
+
+    {
+      let uri = SpecialPowers.wrap(url).URI;
+      is(url.href, uri.spec, "Conversion to nsIURI");
+      is(SpecialPowers.wrap(URL).fromURI(uri).href, uri.spec, "Conversion from nsIURI");
+    }
+
+    if ("skip_setters" in test && test.skip_setters === false) {
+      info("Skip setter methods for URL: " + test);
+      continue;
+    }
+
+    url = new URL("https://www.example.net/what#foo?bar");
+    ok(url, "Url exists!");
+
+    if ("href" in test) url.href = test.href;
+    if ("protocol" in test) url.protocol = test.protocol;
+    if ("username" in test && test.username) url.username = test.username;
+    if ("password" in test && test.password) url.password = test.password;
+    if ("host" in test) url.host = test.host;
+    if ("hostname" in test) url.hostname = test.hostname;
+    if ("port" in test) url.port = test.port;
+    if ("pathname" in test) url.pathname = test.pathname;
+    if ("search" in test) url.search = test.search;
+    if ("hash" in test) url.hash = test.hash;
+
+    if ("href" in test) is(url.href, test.href, "href");
+    if ("origin" in test) is(url.origin, test.origin, "origin");
+    if ("expectedChangedProtocol" in test) is(url.protocol, test.expectedChangedProtocol, "protocol");
+    else if ("protocol" in test) is(url.protocol, test.protocol, "protocol");
+    if ("username" in test) is(url.username, test.username, "username");
+    if ("password" in test) is(url.password, test.password, "password");
+    if ("host" in test) is(url.host, test.host, "host");
+    if ("hostname" in test) is(test.hostname, url.hostname, "hostname");
+    if ("port" in test) is(test.port, url.port, "port");
+    if ("pathname" in test) is(test.pathname, url.pathname, "pathname");
+    if ("search" in test) is(test.search, url.search, "search");
+    if ("hash" in test) is(test.hash, url.hash, "hash");
+
+    if ("href" in test) is(test.href, url + "", "stringify works");
+  }
+
+  </script>
+
+  <script>
+    /** Test for Bug 991471 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "";
+    url.username = "tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt";
+    url.hostname = "www.mozilla.org";
+    url.username = "";
+    url.hostname = "www.mozilla.org";
+    is(url.href, "http://www.mozilla.org/", "No parsing error with empty host");
+  </script>
+
+  <script>
+    /** Test for Bug 996055 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "";
+    is(url.href, "http://localhost/", "Empty hostname is ignored");
+  </script>
+
+  <script>
+    /** Test for Bug 960014 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "[2001::1]";
+    is(url.hostname, "[2001::1]", "IPv6 hostname");
+    is(url.href, "http://[2001::1]/");
+
+    url.hostname = "[::192.9.5.5]";
+    is(url.hostname, "[::c009:505]", "IPv6 hostname");
+    is(url.href, "http://[::c009:505]/");
+
+    url = new URL("http://localhost/");
+    url.hostname = "[::]";
+    is(url.hostname, "[::]", "IPv6 hostname");
+
+    url = new URL("http://localhost/");
+    url.host = "[2001::1]:30";
+    is(url.hostname, "[2001::1]", "IPv6 hostname");
+    is(url.port, "30", "Port");
+    is(url.host, "[2001::1]:30", "IPv6 host");
+
+    url = new URL("http://localhost/");
+    // This should silently fail since it's missing the brackets
+    url.hostname = "2001::1";
+    is(url.hostname, "localhost", "Setting bad hostname fails");
+  </script>
+
+  <script>
+    var blob = new Blob(["a"]);
+    var url = URL.createObjectURL(blob);
+
+    var u = new URL(url);
+    is(u.origin, location.origin, "The URL generated from a blob URI has an origin");
+  </script>
+
+  <script>
+    var blob = new Blob(["a"]);
+    var url = URL.createObjectURL(blob);
+
+    var a = document.createElement("A");
+    a.href = url;
+    is(a.origin, location.origin, "The 'a' element has the correct origin");
+  </script>
+
+  <script>
+    var blob = new Blob(["a"]);
+    var url = URL.createObjectURL(blob);
+    URL.revokeObjectURL(url);
+    URL.revokeObjectURL(url);
+    ok(true, "Calling revokeObjectURL twice should be ok");
+  </script>
+
+  <script>
+    URL.revokeObjectURL("blob:something");
+    ok(true, "This should not throw.");
+  </script>
+
+  <script>
+    var base = new URL("http:\\\\test.com\\path/to\\file?query\\backslash#hash\\");
+    is(base.href, "http://test.com/path/to/file?query\\backslash#hash\\");
+
+    var url = new URL("..\\", base);
+    is(url.href, "http://test.com/path/");
+
+    url = new URL("\\test", base);
+    is(url.href, "http://test.com/test");
+
+    url = new URL("\\test\\", base);
+    is(url.href, "http://test.com/test/");
+
+    url = new URL("http://example.org/test", base);
+    is(url.href, "http://example.org/test");
+
+    url = new URL("ftp://tmp/test", base);
+    is(url.href, "ftp://tmp/test");
+
+    url = new URL("ftp:\\\\tmp\\test", base);
+    is(url.href, "ftp://tmp/test");
+  </script>
+
+  <script>
+    /** Test for Bug 1275746 **/
+    SimpleTest.doesThrow(() => { new URL("http:"); }, "http: is not a valid URL");
+    SimpleTest.doesThrow(() => { new URL("http:///"); }, "http: is not a valid URL");
+
+    var url = new URL("file:");
+    is(url.href, "file:///", "Parsing file: should work.");
+
+    url = new URL("file:///");
+    is(url.href, "file:///", "Parsing file:/// should work.");
+  </script>
+
+  <script>
+    async function testStrippingAndEncoding() {
+      await SpecialPowers.pushPrefEnv({ set: [
+          ["network.url.useDefaultURI", true],
+      ]});
+
+      var url = new URL("scheme:path/to/file?query#hash");
+      is(url.href, "scheme:path/to/file?query#hash");
+      is(url.pathname, "path/to/file");
+      is(url.search, "?query");
+      is(url.hash, "#hash");
+
+      // pathname cannot be overwritten.
+      url.pathname = "new/path?newquery#newhash";
+      is(url.href, "scheme:path/to/file?query#hash");
+
+      // don't escape '#' until we implement a spec-compliant parser.
+      url.search = "?newquery#newhash";
+      is(url.href, "scheme:path/to/file?newquery%23newhash#hash");
+
+      // nulls get encoded, whitespace gets stripped
+      url = new URL("scheme:pa\0\nth/to/fi\0\nle?qu\0\nery#ha\0\nsh");
+      is(url.href, "scheme:pa%00th/to/fi%00le?qu%00ery#ha%00sh");
+
+      url.search = "new\0\nquery";
+      is(url.href, "scheme:pa%00th/to/fi%00le?new%00query#ha%00sh");
+      url.hash = "new\0\nhash";
+      is(url.href, "scheme:pa%00th/to/fi%00le?new%00query#new%00hash");
+
+      url = new URL("scheme:path#hash");
+      is(url.href, "scheme:path#hash");
+      url.search = "query";
+      is(url.href, "scheme:path?query#hash");
+      url.hash = "";
+      is(url.href, "scheme:path?query");
+      url.hash = "newhash";
+      is(url.href, "scheme:path?query#newhash");
+      url.search = "";
+      is(url.href, "scheme:path#newhash");
+
+      // we don't implement a spec-compliant parser yet.
+      // make sure we are bug compatible with existing implementations.
+      url = new URL("data:text/html,<a href=\"http://example.org/?q\">Link</a>");
+      is(url.href, "data:text/html,<a href=\"http://example.org/?q\">Link</a>");
+
+      SimpleTest.finish();
+    };
+    SimpleTest.waitForExplicitFinish();
+    testStrippingAndEncoding();
+  </script>
+
+  <script>
+    var u = new URL("http://www.example.org");
+    is(u.toJSON(), "http://www.example.org/", "URL.toJSON()");
+    is(JSON.stringify(u), "\"http://www.example.org/\"", "JSON.stringify(u) works");
+  </script>
+
+  <script>
+    // bug 1648493
+    var url = new URL("http://example.com/");
+    url.protocol = 'file'
+    url.protocol = 'resource'
+    url.password = 'ê'
+    url.username = 'ç'
+    url.protocol = 't'
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url.xhtml b/dom/url/tests/test_url.xhtml
new file mode 100644
index 0000000000..10978c1f72
--- /dev/null
+++ b/dom/url/tests/test_url.xhtml
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<window title="Test for URL API"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript"><![CDATA[
+
+  /** Test for URL API. **/
+  // Import our test JSM. We first strip the filename off
+  // the chrome url, then append the jsm filename.
+  var base = /.*\//.exec(window.location.href)[0];
+  const {checkFromJSM} = ChromeUtils.import(base + "file_url.jsm");
+
+  checkFromJSM(ok, is);
+
+  ]]></script>
+</window>
diff --git a/dom/url/tests/test_urlExceptions.html b/dom/url/tests/test_urlExceptions.html
new file mode 100644
index 0000000000..4feb30a948
--- /dev/null
+++ b/dom/url/tests/test_urlExceptions.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=926890
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 926890</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=926890">Mozilla Bug 926890</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <script type="application/javascript">
+
+  // URL.href throws
+  var url = new URL("http://www.example.com");
+  ok(url, "URL created");
+
+  try {
+    url.href = "42";
+    ok(false, "url.href = 42 should throw");
+  } catch (e) {
+    ok(true, "url.href = 42 should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  url.href = "http://www.example.org";
+  ok(true, "url.href should not throw");
+
+  try {
+    new URL("42");
+    ok(false, "new URL(42) should throw");
+  } catch (e) {
+    ok(true, "new URL(42) should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  try {
+    new URL("http://www.example.com", "42");
+    ok(false, "new URL(something, 42) should throw");
+  } catch (e) {
+    ok(true, "new URL(something, 42) should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlSearchParams.html b/dom/url/tests/test_urlSearchParams.html
new file mode 100644
index 0000000000..d86959ab64
--- /dev/null
+++ b/dom/url/tests/test_urlSearchParams.html
@@ -0,0 +1,59 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=887836
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for URLSearchParams</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="urlSearchParams_commons.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=887836">Mozilla Bug 887836</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+
+  /** Test for Bug 887836 **/
+  ok("URLSearchParams" in window, "window.URLSearchParams exists");
+
+  var tests = [
+    testSimpleURLSearchParams,
+    testCopyURLSearchParams,
+    testParserURLSearchParams,
+    testURL,
+    testEncoding,
+    testOrdering,
+    testDelete,
+    testGetNULL,
+    testSet,
+    testIterable,
+    testZeroHandling,
+    testCopyConstructor,
+    testCTORs,
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  runTest();
+
+</script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlSearchParams_sorting.html b/dom/url/tests/test_urlSearchParams_sorting.html
new file mode 100644
index 0000000000..a608e8bc13
--- /dev/null
+++ b/dom/url/tests/test_urlSearchParams_sorting.html
@@ -0,0 +1,63 @@
+
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for URLSearchParams.sort()</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script type="application/javascript">
+
+function compareArray(a, b) {
+  is(a.length, b.length, "Length matches");
+  for (let i = 0; i < a.length; ++i) {
+    is(a[i], b[i], "Values " + i + " match");
+  }
+}
+
+[
+  {
+    "input": "z=b&a=b&z=a&a=a",
+    "output": [["a", "b"], ["a", "a"], ["z", "b"], ["z", "a"]],
+  },
+  {
+    "input": "\uFFFD=x&\uFFFC&\uFFFD=a",
+    "output": [["\uFFFC", ""], ["\uFFFD", "x"], ["\uFFFD", "a"]],
+  },
+  {
+    "input": "ffi&🌈", // 🌈 > code point, but < code unit because two code units
+    "output": [["🌈", ""], ["ffi", ""]],
+  },
+  {
+    "input": "é&e\uFFFD&e\u0301",
+    "output": [["e\u0301", ""], ["e\uFFFD", ""], ["é", ""]],
+  },
+  {
+    "input": "z=z&a=a&z=y&a=b&z=x&a=c&z=w&a=d&z=v&a=e&z=u&a=f&z=t&a=g",
+    "output": [["a", "a"], ["a", "b"], ["a", "c"], ["a", "d"], ["a", "e"], ["a", "f"], ["a", "g"], ["z", "z"], ["z", "y"], ["z", "x"], ["z", "w"], ["z", "v"], ["z", "u"], ["z", "t"]],
+  },
+].forEach((val) => {
+  info("Run test: " + JSON.stringify(val) + "\n");
+
+  let params = new URLSearchParams(val.input);
+  params.sort();
+
+  let i = 0;
+  for (let param of params) {
+    compareArray(param, val.output[i++]);
+  }
+
+  let url = new URL("?" + val.input, "https://example/");
+  url.searchParams.sort();
+  params = new URLSearchParams(url.search);
+  i = 0;
+  for (let param of params) {
+    compareArray(param, val.output[i++]);
+  }
+});
+
+</script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlSearchParams_utf8.html b/dom/url/tests/test_urlSearchParams_utf8.html
new file mode 100644
index 0000000000..2a37b3b9a1
--- /dev/null
+++ b/dom/url/tests/test_urlSearchParams_utf8.html
@@ -0,0 +1,39 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1032511
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1032511</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=1032511">Mozilla Bug 1032511</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+<a href="http://www.example.net?a=b&c=d" id="anchor">foobar</a>
+<area href="http://www.example.net?a=b&c=d" id="area">foobar</area>
+<script type="application/javascript">
+
+  /** Test for Bug 1032511 **/
+  var a = new URLSearchParams("%e2");
+  ok(a, "a exists");
+  is(a.toString(), "%EF%BF%BD=", "The value should be here.");
+
+  a = new URLSearchParams("a%e2");
+  is(a.toString(), "a%EF%BF%BD=", "The value should be here.");
+
+  a = new URLSearchParams("a%e2b");
+  is(a.toString(), "a%EF%BF%BDb=", "The value should be here.");
+
+</script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url_data.html b/dom/url/tests/test_url_data.html
new file mode 100644
index 0000000000..beeb7a2d39
--- /dev/null
+++ b/dom/url/tests/test_url_data.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test URL API - data:plain</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=1018682">Mozilla Bug 1018682</a>
+
+<script type="application/javascript">
+
+var base = new URL("data:text/plain,");
+
+let relative;
+try {
+  relative = new URL("a", base);
+  ok(false, "Relative URL from a data:text/plain should not work.");
+} catch (e) {
+  ok(true, "Relative URL from a data:text/plain should not work.");
+}
+
+base.protocol = "chrome:";
+is(base.protocol, "chrome:", "The protocol should be changed from data to chrome.");
+
+try {
+  relative = new URL("a", base);
+  ok(true, "Relative URL from a chrome: should work.");
+} catch (e) {
+  ok(false, "Relative URL from a chrome: should work.");
+}
+
+base.protocol = "http:";
+ok(true, "Protocol: http not changed (special scheme)");
+is(base.href, "chrome://text/plain,", "Base URL is correct");
+
+relative = new URL("a", base);
+ok(relative, "This works.");
+is(relative.href, "chrome://text/a", "Relative URL is correct");
+
+</script>
+
+</body>
+</html>
diff --git a/dom/url/tests/test_url_empty_port.html b/dom/url/tests/test_url_empty_port.html
new file mode 100644
index 0000000000..5001bdfae5
--- /dev/null
+++ b/dom/url/tests/test_url_empty_port.html
@@ -0,0 +1,53 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=930450
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 930450</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=930450">Mozilla Bug 930450</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var url = new URL("http://www.example.com:8080");
+  is(url.port, "8080", "URL.port is 8080");
+  url.port = "";
+  is(url.port, "", "URL.port is ''");
+  url.port = 0;
+  is(url.port, "0", "URL.port is 0");
+
+  var link = document.getElementById("link");
+  is(link.port, "8080", "URL.port is 8080");
+  link.port = "";
+  is(link.href, "http://www.example.com/", "link.href matches");
+  is(link.port, "", "URL.port is ''");
+  link.port = 0;
+  is(link.href, "http://www.example.com:0/", "link.href matches");
+  is(link.port, "0", "URL.port is 0");
+
+  var area = document.getElementById("area");
+  is(area.port, "8080", "URL.port is 8080");
+  area.port = "";
+  is(area.href, "http://www.example.com/", "area.href matches");
+  is(area.port, "", "URL.port is ''");
+  area.port = 0;
+  is(area.href, "http://www.example.com:0/", "area.href matches");
+  is(area.port, "0", "URL.port is 0");
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url_malformedHost.html b/dom/url/tests/test_url_malformedHost.html
new file mode 100644
index 0000000000..7cc23d7e32
--- /dev/null
+++ b/dom/url/tests/test_url_malformedHost.html
@@ -0,0 +1,48 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1020041
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1020041</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=1020041">Mozilla Bug 1020041</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var tests = [
+    { host: "?", expected: "www.example.com" },
+    { host: "what?", expected: "what" },
+    { host: "so what", expected: "www.example.com" },
+    { host: "aa#bb", expected: "aa" },
+    { host: "a/b", expected: "a" },
+    { host: "a\\b", expected: "a" },
+    { host: "[2001::1]#bla:10", expected: "[2001::1]"},
+  ];
+
+  for (var i = 0; i < tests.length; ++i) {
+    var url = new URL("http://www.example.com");
+    url.host = tests[i].host;
+    is(url.host, tests[i].expected, "URL.host is: " + url.host);
+
+    url = new URL("http://www.example.com");
+    url.hostname = tests[i].host;
+    is(url.hostname, tests[i].expected, "URL.hostname is: " + url.host);
+  }
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlutils_stringify.html b/dom/url/tests/test_urlutils_stringify.html
new file mode 100644
index 0000000000..7c68051535
--- /dev/null
+++ b/dom/url/tests/test_urlutils_stringify.html
@@ -0,0 +1,38 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=959190
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 959190</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=959190">Mozilla Bug 959190</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var url = new URL("http://www.example.com:8080");
+  is(url + "", "http://www.example.com:8080/", "URL stringify");
+
+  var link = document.getElementById("link");
+  is(link + "", "http://www.example.com:8080/", "Anchor stringify");
+
+  var area = document.getElementById("area");
+  is(area + "", "http://www.example.com:8080/", "Area stringify");
+
+  is((location + "").indexOf(`${location.origin}/tests/dom/url/tests/test_urlutils_stringify.html`), 0, "Location stringify");
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_protocol.html b/dom/url/tests/test_worker_protocol.html
new file mode 100644
index 0000000000..1687159d6a
--- /dev/null
+++ b/dom/url/tests/test_worker_protocol.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 for URL protocol setter in 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">
+
+  let worker = new Worker("protocol_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker, "Correct worker");
+
+    if (event.data.type == "finish") {
+      SimpleTest.finish();
+      return;
+    }
+
+    if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+      return;
+    }
+
+    ok(false, "Invalid message.");
+  };
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_url.html b/dom/url/tests/test_worker_url.html
new file mode 100644
index 0000000000..8bcd265d19
--- /dev/null
+++ b/dom/url/tests/test_worker_url.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 for URL object in 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">
+
+  var worker = new Worker("url_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker, "Correct worker");
+
+    if (event.data.type == "finish") {
+      runTest();
+    } else if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+    } else if (event.data.type == "url") {
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", event.data.url, false);
+      xhr.onreadystatechange = function() {
+        if (xhr.readyState == 4) {
+          ok(true, "Blob readable!");
+        }
+      };
+      xhr.send();
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker, "Correct worker");
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  var tests = [
+    function() { worker.postMessage(0); },
+    function() { worker.postMessage(1); },
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  runTest();
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_url.xhtml b/dom/url/tests/test_worker_url.xhtml
new file mode 100644
index 0000000000..30d2aa131d
--- /dev/null
+++ b/dom/url/tests/test_worker_url.xhtml
@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="DOM Worker Threads Test"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"/>
+
+  <script type="application/javascript">
+  <![CDATA[
+
+    function test()
+    {
+      SimpleTest.waitForExplicitFinish();
+
+      const {checkFromJSM} = ChromeUtils.import("chrome://mochitests/content/chrome/dom/url/tests/file_worker_url.jsm");
+      checkFromJSM(ok, is, 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>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/url/tests/test_worker_urlApi.html b/dom/url/tests/test_worker_urlApi.html
new file mode 100644
index 0000000000..34de982ef1
--- /dev/null
+++ b/dom/url/tests/test_worker_urlApi.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>Test for URL API object in 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">
+
+  var worker = new Worker("urlApi_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == "finish") {
+      SimpleTest.finish();
+    } else if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.data);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(true);
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_urlSearchParams.html b/dom/url/tests/test_worker_urlSearchParams.html
new file mode 100644
index 0000000000..1870d5d7dc
--- /dev/null
+++ b/dom/url/tests/test_worker_urlSearchParams.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>Test for URLSearchParams object in 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">
+
+  var worker = new Worker("urlSearchParams_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == "finish") {
+      SimpleTest.finish();
+    } else if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(true);
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_url_exceptions.html b/dom/url/tests/test_worker_url_exceptions.html
new file mode 100644
index 0000000000..2c8b493bbf
--- /dev/null
+++ b/dom/url/tests/test_worker_url_exceptions.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>Test for URL exceptions in 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">
+
+  var worker = new Worker("url_exceptions_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == "finish") {
+      SimpleTest.finish();
+    } else if (event.data.type == "status") {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(0);
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/urlApi_worker.js b/dom/url/tests/urlApi_worker.js
new file mode 100644
index 0000000000..5a969c8e4c
--- /dev/null
+++ b/dom/url/tests/urlApi_worker.js
@@ -0,0 +1,358 @@
+/* eslint-env worker */
+
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  postMessage({ type: "status", status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a === b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({
+    type: "status",
+    status: a === b,
+    msg: a + " === " + b + ": " + msg,
+  });
+}
+
+// eslint-disable-next-line complexity
+onmessage = function () {
+  let status = false;
+  try {
+    if (URL instanceof Object) {
+      status = true;
+    }
+  } catch (e) {}
+
+  ok(status, "URL in workers \\o/");
+
+  var tests = [
+    {
+      url: "http://www.abc.com",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/",
+      origin: "http://www.abc.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/",
+      search: "",
+      hash: "",
+    },
+    {
+      url: "ftp://auser:apw@www.abc.com",
+      base: undefined,
+      error: false,
+      href: "ftp://auser:apw@www.abc.com/",
+      origin: "ftp://www.abc.com",
+      protocol: "ftp:",
+      username: "auser",
+      password: "apw",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/",
+      search: "",
+      hash: "",
+    },
+    {
+      url: "http://www.abc.com:90/apath/",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com:90/apath/",
+      origin: "http://www.abc.com:90",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com:90",
+      hostname: "www.abc.com",
+      port: "90",
+      pathname: "/apath/",
+      search: "",
+      hash: "",
+    },
+    {
+      url: "http://www.abc.com/apath/afile.txt#ahash",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt#ahash",
+      origin: "http://www.abc.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "www.abc.com",
+      hostname: "www.abc.com",
+      port: "",
+      pathname: "/apath/afile.txt",
+      search: "",
+      hash: "#ahash",
+    },
+    {
+      url: "http://example.com/?test#hash",
+      base: undefined,
+      error: false,
+      href: "http://example.com/?test#hash",
+      origin: "http://example.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "example.com",
+      hostname: "example.com",
+      port: "",
+      pathname: "/",
+      search: "?test",
+      hash: "#hash",
+    },
+    {
+      url: "http://example.com/?test",
+      base: undefined,
+      error: false,
+      href: "http://example.com/?test",
+      origin: "http://example.com",
+      protocol: "http:",
+      username: "",
+      password: "",
+      host: "example.com",
+      hostname: "example.com",
+      port: "",
+      pathname: "/",
+      search: "?test",
+      hash: "",
+    },
+    {
+      url: "http://example.com/carrot#question%3f",
+      base: undefined,
+      error: false,
+      hash: "#question%3f",
+    },
+    {
+      url: "https://example.com:4443?",
+      base: undefined,
+      error: false,
+      protocol: "https:",
+      port: "4443",
+      pathname: "/",
+      hash: "",
+      search: "",
+    },
+    {
+      url: "http://www.abc.com/apath/afile.txt#ahash?asearch",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt#ahash?asearch",
+      protocol: "http:",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash?asearch",
+      search: "",
+    },
+    {
+      url: "http://www.abc.com/apath/afile.txt?asearch#ahash",
+      base: undefined,
+      error: false,
+      href: "http://www.abc.com/apath/afile.txt?asearch#ahash",
+      protocol: "http:",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "?asearch",
+    },
+    {
+      url: "http://abc.com/apath/afile.txt?#ahash",
+      base: undefined,
+      error: false,
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "",
+    },
+    {
+      url: "http://auser:apassword@www.abc.com:90/apath/afile.txt?asearch#ahash",
+      base: undefined,
+      error: false,
+      protocol: "http:",
+      username: "auser",
+      password: "apassword",
+      host: "www.abc.com:90",
+      hostname: "www.abc.com",
+      port: "90",
+      pathname: "/apath/afile.txt",
+      hash: "#ahash",
+      search: "?asearch",
+      origin: "http://www.abc.com:90",
+    },
+
+    { url: "/foo#bar", base: "www.test.org", error: true },
+    { url: "/foo#bar", base: null, error: true },
+    { url: "/foo#bar", base: 42, error: true },
+    {
+      url: "ftp://ftp.something.net",
+      base: undefined,
+      error: false,
+      protocol: "ftp:",
+    },
+    {
+      url: "file:///tmp/file",
+      base: undefined,
+      error: false,
+      protocol: "file:",
+    },
+    {
+      url: "gopher://gopher.something.net",
+      base: undefined,
+      error: false,
+      protocol: "gopher:",
+      expectedChangedProtocol: "https:",
+    },
+    {
+      url: "ws://ws.something.net",
+      base: undefined,
+      error: false,
+      protocol: "ws:",
+    },
+    {
+      url: "wss://ws.something.net",
+      base: undefined,
+      error: false,
+      protocol: "wss:",
+    },
+    {
+      url: "foo://foo.something.net",
+      base: undefined,
+      error: false,
+      protocol: "foo:",
+      expectedChangedProtocol: "https:",
+    },
+  ];
+
+  while (tests.length) {
+    var test = tests.shift();
+
+    var error = false;
+    var url;
+    try {
+      if (test.base) {
+        url = new URL(test.url, test.base);
+      } else {
+        url = new URL(test.url);
+      }
+    } catch (e) {
+      error = true;
+    }
+
+    is(test.error, error, "Error creating URL");
+    if (test.error) {
+      continue;
+    }
+
+    if ("href" in test) {
+      is(url.href, test.href, "href");
+    }
+    if ("origin" in test) {
+      is(url.origin, test.origin, "origin");
+    }
+    if ("protocol" in test) {
+      is(url.protocol, test.protocol, "protocol");
+    }
+    if ("username" in test) {
+      is(url.username, test.username, "username");
+    }
+    if ("password" in test) {
+      is(url.password, test.password, "password");
+    }
+    if ("host" in test) {
+      is(url.host, test.host, "host");
+    }
+    if ("hostname" in test) {
+      is(url.hostname, test.hostname, "hostname");
+    }
+    if ("port" in test) {
+      is(url.port, test.port, "port");
+    }
+    if ("pathname" in test) {
+      is(url.pathname, test.pathname, "pathname");
+    }
+    if ("search" in test) {
+      is(url.search, test.search, "search");
+    }
+    if ("hash" in test) {
+      is(url.hash, test.hash, "hash");
+    }
+
+    url = new URL("https://www.example.net/what#foo?bar");
+    ok(url, "Url exists!");
+
+    if ("href" in test) {
+      url.href = test.href;
+    }
+    if ("protocol" in test) {
+      url.protocol = test.protocol;
+    }
+    if ("username" in test && test.username) {
+      url.username = test.username;
+    }
+    if ("password" in test && test.password) {
+      url.password = test.password;
+    }
+    if ("host" in test) {
+      url.host = test.host;
+    }
+    if ("hostname" in test) {
+      url.hostname = test.hostname;
+    }
+    if ("port" in test) {
+      url.port = test.port;
+    }
+    if ("pathname" in test) {
+      url.pathname = test.pathname;
+    }
+    if ("search" in test) {
+      url.search = test.search;
+    }
+    if ("hash" in test) {
+      url.hash = test.hash;
+    }
+
+    if ("href" in test) {
+      is(url.href, test.href, "href");
+    }
+    if ("origin" in test) {
+      is(url.origin, test.origin, "origin");
+    }
+    if ("expectedChangedProtocol" in test) {
+      is(url.protocol, test.expectedChangedProtocol, "protocol");
+    } else if ("protocol" in test) {
+      is(url.protocol, test.protocol, "protocol");
+    }
+    if ("username" in test) {
+      is(url.username, test.username, "username");
+    }
+    if ("password" in test) {
+      is(url.password, test.password, "password");
+    }
+    if ("host" in test) {
+      is(url.host, test.host, "host");
+    }
+    if ("hostname" in test) {
+      is(test.hostname, url.hostname, "hostname");
+    }
+    if ("port" in test) {
+      is(test.port, url.port, "port");
+    }
+    if ("pathname" in test) {
+      is(test.pathname, url.pathname, "pathname");
+    }
+    if ("search" in test) {
+      is(test.search, url.search, "search");
+    }
+    if ("hash" in test) {
+      is(test.hash, url.hash, "hash");
+    }
+
+    if ("href" in test) {
+      is(test.href, url + "", "stringify works");
+    }
+  }
+
+  postMessage({ type: "finish" });
+};
diff --git a/dom/url/tests/urlSearchParams_commons.js b/dom/url/tests/urlSearchParams_commons.js
new file mode 100644
index 0000000000..3a1dcb2807
--- /dev/null
+++ b/dom/url/tests/urlSearchParams_commons.js
@@ -0,0 +1,376 @@
+/* import-globals-from urlSearchParams_worker.js */
+
+function testSimpleURLSearchParams() {
+  var u = new URLSearchParams();
+  ok(u, "URLSearchParams created");
+  is(u.has("foo"), false, "URLSearchParams.has(foo)");
+  is(u.get("foo"), null, "URLSearchParams.get(foo)");
+  is(u.getAll("foo").length, 0, "URLSearchParams.getAll(foo)");
+
+  u.append("foo", "bar");
+  is(u.has("foo"), true, "URLSearchParams.has(foo)");
+  is(u.get("foo"), "bar", "URLSearchParams.get(foo)");
+  is(u.getAll("foo").length, 1, "URLSearchParams.getAll(foo)");
+
+  u.set("foo", "bar2");
+  is(u.get("foo"), "bar2", "URLSearchParams.get(foo)");
+  is(u.getAll("foo").length, 1, "URLSearchParams.getAll(foo)");
+
+  is(u + "", "foo=bar2", "stringifier");
+
+  u.delete("foo");
+
+  runTest();
+}
+
+function testCopyURLSearchParams() {
+  var u = new URLSearchParams();
+  ok(u, "URLSearchParams created");
+  u.append("foo", "bar");
+
+  var uu = new URLSearchParams(u);
+  is(uu.get("foo"), "bar", "uu.get()");
+
+  u.append("foo", "bar2");
+  is(u.getAll("foo").length, 2, "u.getAll()");
+  is(uu.getAll("foo").length, 1, "uu.getAll()");
+
+  runTest();
+}
+
+function testURL() {
+  var url = new URL("http://www.example.net?a=b&c=d");
+  ok(url.searchParams, "URL searchParams exists!");
+  ok(url.searchParams.has("a"), "URL.searchParams.has('a')");
+  is(url.searchParams.get("a"), "b", "URL.searchParams.get('a')");
+  ok(url.searchParams.has("c"), "URL.searchParams.has('c')");
+  is(url.searchParams.get("c"), "d", "URL.searchParams.get('c')");
+
+  url.searchParams.set("e", "f");
+  ok(url.href.indexOf("e=f") != 1, "URL right");
+
+  url = new URL("mailto:a@b.com?subject=Hi");
+  ok(url.searchParams, "URL searchParams exists!");
+  ok(url.searchParams.has("subject"), "Hi");
+
+  runTest();
+}
+
+function testParserURLSearchParams() {
+  var checks = [
+    { input: "", data: {} },
+    { input: "a", data: { a: [""] } },
+    { input: "a=b", data: { a: ["b"] } },
+    { input: "a=", data: { a: [""] } },
+    { input: "=b", data: { "": ["b"] } },
+    { input: "&", data: {} },
+    { input: "&a", data: { a: [""] } },
+    { input: "a&", data: { a: [""] } },
+    { input: "a&a", data: { a: ["", ""] } },
+    { input: "a&b&c", data: { a: [""], b: [""], c: [""] } },
+    { input: "a=b&c=d", data: { a: ["b"], c: ["d"] } },
+    { input: "a=b&c=d&", data: { a: ["b"], c: ["d"] } },
+    { input: "&&&a=b&&&&c=d&", data: { a: ["b"], c: ["d"] } },
+    { input: "a=a&a=b&a=c", data: { a: ["a", "b", "c"] } },
+    { input: "a==a", data: { a: ["=a"] } },
+    { input: "a=a+b+c+d", data: { a: ["a b c d"] } },
+    { input: "%=a", data: { "%": ["a"] } },
+    { input: "%a=a", data: { "%a": ["a"] } },
+    { input: "%a_=a", data: { "%a_": ["a"] } },
+    { input: "%61=a", data: { a: ["a"] } },
+    { input: "%=a", data: { "%": ["a"] } },
+    { input: "%a=a", data: { "%a": ["a"] } },
+    { input: "%a_=a", data: { "%a_": ["a"] } },
+    { input: "%61=a", data: { a: ["a"] } },
+    { input: "%61+%4d%4D=", data: { "a MM": [""] } },
+    { input: "?a=1", data: { a: ["1"] } },
+    { input: "?", data: {} },
+    { input: "?=b", data: { "": ["b"] } },
+  ];
+
+  for (var i = 0; i < checks.length; ++i) {
+    var u = new URLSearchParams(checks[i].input);
+
+    var count = 0;
+    for (var key in checks[i].data) {
+      count = count + 1;
+      ok(u.has(key), "key " + key + " found");
+
+      var all = u.getAll(key);
+      is(all.length, checks[i].data[key].length, "same number of elements");
+
+      for (var k = 0; k < all.length; ++k) {
+        is(all[k], checks[i].data[key][k], "value matches");
+      }
+    }
+  }
+
+  runTest();
+}
+
+function testEncoding() {
+  var encoding = [
+    ["1", "1"],
+    ["a b", "a+b"],
+    ["<>", "%3C%3E"],
+    ["\u0541", "%D5%81"],
+  ];
+
+  for (var i = 0; i < encoding.length; ++i) {
+    var url = new URL("http://www.example.net");
+    url.searchParams.set("a", encoding[i][0]);
+    is(url.href, "http://www.example.net/?a=" + encoding[i][1]);
+
+    var url2 = new URL(url.href);
+    is(url2.searchParams.get("a"), encoding[i][0], "a is still there");
+  }
+
+  runTest();
+}
+
+function testCopyConstructor() {
+  var url = new URL("http://example.com/");
+  var p = url.searchParams;
+  var q = new URLSearchParams(p);
+  q.set("a", "b");
+  is(
+    url.href,
+    "http://example.com/",
+    "Messing with copy of URLSearchParams should not affect URL"
+  );
+  p.set("c", "d");
+  is(
+    url.href,
+    "http://example.com/?c=d",
+    "Messing with URLSearchParams should affect URL"
+  );
+
+  runTest();
+}
+
+function testOrdering() {
+  var a = new URLSearchParams("a=1&a=2&b=3&c=4&c=5&a=6");
+  is(a.toString(), "a=1&a=2&b=3&c=4&c=5&a=6", "Order is correct");
+  is(a.getAll("a").length, 3, "Correct length of getAll()");
+
+  var b = new URLSearchParams();
+  b.append("a", "1");
+  b.append("b", "2");
+  b.append("a", "3");
+  is(b.toString(), "a=1&b=2&a=3", "Order is correct");
+  is(b.getAll("a").length, 2, "Correct length of getAll()");
+
+  runTest();
+}
+
+function testDelete() {
+  var a = new URLSearchParams("a=1&a=2&b=3&c=4&c=5&a=6");
+  is(a.toString(), "a=1&a=2&b=3&c=4&c=5&a=6", "Order is correct");
+  is(a.getAll("a").length, 3, "Correct length of getAll()");
+
+  a.delete("a");
+  is(a.getAll("a").length, 0, "Correct length of getAll()");
+  is(a.toString(), "b=3&c=4&c=5", "Order is correct");
+
+  runTest();
+}
+
+function testGetNULL() {
+  var u = new URLSearchParams();
+  is(typeof u.get(""), "object", "typeof URL.searchParams.get('')");
+  is(u.get(""), null, "URL.searchParams.get('') should be null");
+
+  var url = new URL("http://www.example.net?a=b");
+  is(
+    url.searchParams.get("b"),
+    null,
+    "URL.searchParams.get('b') should be null"
+  );
+  is(url.searchParams.get("a"), "b", "URL.searchParams.get('a')");
+
+  runTest();
+}
+
+function testSet() {
+  var u = new URLSearchParams();
+  u.set("a", "b");
+  u.set("e", "c");
+  u.set("i", "d");
+  u.set("o", "f");
+  u.set("u", "g");
+
+  is(u.get("a"), "b", "URL.searchParams.get('a') should return b");
+  is(u.getAll("a").length, 1, "URLSearchParams.getAll('a').length should be 1");
+
+  u.set("a", "h1");
+  u.set("a", "h2");
+  u.set("a", "h3");
+  u.set("a", "h4");
+  is(u.get("a"), "h4", "URL.searchParams.get('a') should return h4");
+  is(u.getAll("a").length, 1, "URLSearchParams.getAll('a').length should be 1");
+
+  is(u.get("e"), "c", "URL.searchParams.get('e') should return c");
+  is(u.get("i"), "d", "URL.searchParams.get('i') should return d");
+  is(u.get("o"), "f", "URL.searchParams.get('o') should return f");
+  is(u.get("u"), "g", "URL.searchParams.get('u') should return g");
+
+  is(u.getAll("e").length, 1, "URLSearchParams.getAll('e').length should be 1");
+  is(u.getAll("i").length, 1, "URLSearchParams.getAll('i').length should be 1");
+  is(u.getAll("o").length, 1, "URLSearchParams.getAll('o').length should be 1");
+  is(u.getAll("u").length, 1, "URLSearchParams.getAll('u').length should be 1");
+
+  u = new URLSearchParams("name1=value1&name1=value2&name1=value3");
+  is(
+    u.get("name1"),
+    "value1",
+    "URL.searchParams.get('name1') should return value1"
+  );
+  is(
+    u.getAll("name1").length,
+    3,
+    "URLSearchParams.getAll('name1').length should be 3"
+  );
+  u.set("name1", "firstPair");
+  is(
+    u.get("name1"),
+    "firstPair",
+    "URL.searchParams.get('name1') should return firstPair"
+  );
+  is(
+    u.getAll("name1").length,
+    1,
+    "URLSearchParams.getAll('name1').length should be 1"
+  );
+
+  runTest();
+}
+
+function testIterable() {
+  var u = new URLSearchParams();
+  u.set("1", "2");
+  u.set("2", "4");
+  u.set("3", "6");
+  u.set("4", "8");
+  u.set("5", "10");
+
+  var key_iter = u.keys();
+  var value_iter = u.values();
+  var entries_iter = u.entries();
+  for (var i = 0; i < 5; ++i) {
+    var v = i + 1;
+    var key = key_iter.next();
+    var value = value_iter.next();
+    var entry = entries_iter.next();
+    is(key.value, v.toString(), "Correct Key iterator: " + v.toString());
+    ok(!key.done, "Key.done is false");
+    is(
+      value.value,
+      (v * 2).toString(),
+      "Correct Value iterator: " + (v * 2).toString()
+    );
+    ok(!value.done, "Value.done is false");
+    is(
+      entry.value[0],
+      v.toString(),
+      "Correct Entry 0 iterator: " + v.toString()
+    );
+    is(
+      entry.value[1],
+      (v * 2).toString(),
+      "Correct Entry 1 iterator: " + (v * 2).toString()
+    );
+    ok(!entry.done, "Entry.done is false");
+  }
+
+  var last = key_iter.next();
+  ok(last.done, "Nothing more to read.");
+  is(last.value, undefined, "Undefined is the last key");
+
+  last = value_iter.next();
+  ok(last.done, "Nothing more to read.");
+  is(last.value, undefined, "Undefined is the last value");
+
+  last = entries_iter.next();
+  ok(last.done, "Nothing more to read.");
+
+  key_iter = u.keys();
+  key_iter.next();
+  key_iter.next();
+  u.delete("1");
+  u.delete("2");
+  u.delete("3");
+  u.delete("4");
+  u.delete("5");
+
+  last = key_iter.next();
+  ok(last.done, "Nothing more to read.");
+  is(last.value, undefined, "Undefined is the last key");
+
+  runTest();
+}
+function testZeroHandling() {
+  var u = new URLSearchParams();
+  u.set("a", "b\0c");
+  u.set("d\0e", "f");
+  u.set("g\0h", "i\0j");
+  is(
+    u.toString(),
+    "a=b%00c&d%00e=f&g%00h=i%00j",
+    "Should encode U+0000 as %00"
+  );
+
+  runTest();
+}
+
+function testCTORs() {
+  var a = new URLSearchParams("a=b");
+  is(a.get("a"), "b", "CTOR with string");
+
+  var b = new URLSearchParams([
+    ["a", "b"],
+    ["c", "d"],
+  ]);
+  is(b.get("a"), "b", "CTOR with sequence");
+  is(b.get("c"), "d", "CTOR with sequence");
+
+  ok(new URLSearchParams([]), "CTOR with empty sequence");
+
+  let result;
+  try {
+    result = new URLSearchParams([[1]]);
+  } catch (e) {
+    result = 42;
+  }
+
+  is(
+    result,
+    42,
+    "CTOR throws if the sequence doesn't contain exactly 2 elements"
+  );
+
+  try {
+    result = new URLSearchParams([[1, 2, 3]]);
+  } catch (e) {
+    result = 43;
+  }
+  is(
+    result,
+    43,
+    "CTOR throws if the sequence doesn't contain exactly 2 elements"
+  );
+
+  var c = new URLSearchParams({
+    a: "b",
+    c: 42,
+    d: null,
+    e: [1, 2, 3],
+    f: { a: 42 },
+  });
+  is(c.get("a"), "b", "CTOR with record<>");
+  is(c.get("c"), "42", "CTOR with record<>");
+  is(c.get("d"), "null", "CTOR with record<>");
+  is(c.get("e"), [1, 2, 3].toString(), "CTOR with record<>");
+  is(c.get("f"), { a: 42 }.toString(), "CTOR with record<>");
+
+  runTest();
+}
diff --git a/dom/url/tests/urlSearchParams_worker.js b/dom/url/tests/urlSearchParams_worker.js
new file mode 100644
index 0000000000..7959fd7d1c
--- /dev/null
+++ b/dom/url/tests/urlSearchParams_worker.js
@@ -0,0 +1,48 @@
+/* eslint-env worker */
+
+importScripts("urlSearchParams_commons.js");
+
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  postMessage({ type: "status", status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a === b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({
+    type: "status",
+    status: a === b,
+    msg: a + " === " + b + ": " + msg,
+  });
+}
+
+var tests = [
+  testSimpleURLSearchParams,
+  testCopyURLSearchParams,
+  testParserURLSearchParams,
+  testURL,
+  testEncoding,
+  testCTORs,
+];
+
+function runTest() {
+  if (!tests.length) {
+    postMessage({ type: "finish" });
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+onmessage = function () {
+  let status = false;
+  try {
+    if (URLSearchParams instanceof Object) {
+      status = true;
+    }
+  } catch (e) {}
+  ok(status, "URLSearchParams in workers \\o/");
+
+  runTest();
+};
diff --git a/dom/url/tests/url_exceptions_worker.js b/dom/url/tests/url_exceptions_worker.js
new file mode 100644
index 0000000000..c8d8494ac9
--- /dev/null
+++ b/dom/url/tests/url_exceptions_worker.js
@@ -0,0 +1,38 @@
+function ok(a, msg) {
+  postMessage({ type: "status", status: !!a, msg });
+}
+
+onmessage = function (event) {
+  // URL.href throws
+  var url = new URL("http://www.example.com");
+  ok(url, "URL created");
+
+  var status = false;
+  try {
+    url.href = "42";
+  } catch (e) {
+    status = true;
+  }
+  ok(status, "url.href = 42 should throw");
+
+  url.href = "http://www.example.org";
+  ok(true, "url.href should not throw");
+
+  status = false;
+  try {
+    new URL("42");
+  } catch (e) {
+    status = true;
+  }
+  ok(status, "new URL(42) should throw");
+
+  status = false;
+  try {
+    new URL("http://www.example.com", "42");
+  } catch (e) {
+    status = true;
+  }
+  ok(status, "new URL(something, 42) should throw");
+
+  postMessage({ type: "finish" });
+};
diff --git a/dom/url/tests/url_worker.js b/dom/url/tests/url_worker.js
new file mode 100644
index 0000000000..8a69744603
--- /dev/null
+++ b/dom/url/tests/url_worker.js
@@ -0,0 +1,98 @@
+/* eslint-env worker */
+
+onmessage = function (event) {
+  if (event.data != 0) {
+    var worker = new Worker("url_worker.js");
+    worker.onmessage = function (ev) {
+      postMessage(ev.data);
+    };
+
+    worker.postMessage(event.data - 1);
+    return;
+  }
+
+  let status = false;
+  try {
+    if (URL instanceof Object) {
+      status = true;
+    }
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "URL object:" + URL });
+
+  status = false;
+  var blob = null;
+  try {
+    blob = new Blob([]);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob:" + blob });
+
+  status = false;
+  let url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob URL:" + url });
+
+  status = false;
+  try {
+    URL.revokeObjectURL(url);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob Revoke URL" });
+
+  status = false;
+  url = null;
+  try {
+    url = URL.createObjectURL(true);
+  } catch (e) {
+    status = true;
+  }
+
+  postMessage({
+    type: "status",
+    status,
+    msg: "CreateObjectURL should fail if the arg is not a blob",
+  });
+
+  status = false;
+  url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch (e) {}
+
+  postMessage({ type: "status", status, msg: "Blob URL2:" + url });
+  postMessage({ type: "url", url });
+
+  status = false;
+  try {
+    URL.createObjectURL({});
+  } catch (e) {
+    status = true;
+  }
+
+  postMessage({ type: "status", status, msg: "Exception wanted" });
+
+  blob = new Blob([123]);
+  var uri = URL.createObjectURL(blob);
+  postMessage({
+    type: "status",
+    status: !!uri,
+    msg: "The URI has been generated from the blob",
+  });
+
+  var u = new URL(uri);
+  postMessage({
+    type: "status",
+    status: u.origin == location.origin,
+    msg: "The URL generated from a blob URI has an origin.",
+  });
+
+  postMessage({ type: "finish" });
+};