From fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:14:29 +0200
Subject: Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/events/Clipboard.cpp                           |  84 ++++++--
 dom/events/Clipboard.h                             |   7 +-
 dom/events/DataTransfer.cpp                        | 114 ++++++----
 dom/events/DataTransfer.h                          |  25 ++-
 dom/events/EventListenerService.cpp                |  63 ------
 dom/events/EventNameList.h                         |   3 +
 dom/events/PointerEventHandler.cpp                 |  51 +++--
 dom/events/PointerEventHandler.h                   |  38 +++-
 dom/events/TouchEvent.cpp                          |   2 +-
 dom/events/nsIEventListenerService.idl             |  30 ---
 ..._navigator_clipboard_contextmenu_suppression.js | 163 ++++++++++++++-
 dom/events/test/mochitest.toml                     |   3 +
 .../pointerevents/mochitest_support_external.js    |   2 +
 dom/events/test/pointerevents/test_bug1315862.html |   4 +-
 dom/events/test/test_accesskey.html                |   2 +-
 dom/events/test/test_bug226361.xhtml               |   9 +-
 dom/events/test/test_bug238987.html                |   2 +-
 dom/events/test/test_bug336682.js                  |   2 +
 dom/events/test/test_bug448602.html                |  21 --
 .../test/test_mouse_events_after_touchend.html     | 232 +++++++++++++++++++++
 ...lit_keypress_event_model_on_old_Confluence.html |   2 +-
 ...ss_event_model_on_old_Office_Online_Server.html |   2 +-
 22 files changed, 636 insertions(+), 225 deletions(-)
 create mode 100644 dom/events/test/test_mouse_events_after_touchend.html

(limited to 'dom/events')

diff --git a/dom/events/Clipboard.cpp b/dom/events/Clipboard.cpp
index 560002dd68..b163bc816f 100644
--- a/dom/events/Clipboard.cpp
+++ b/dom/events/Clipboard.cpp
@@ -29,6 +29,7 @@
 #include "nsArrayUtils.h"
 #include "nsComponentManagerUtils.h"
 #include "nsContentUtils.h"
+#include "nsGlobalWindowInner.h"
 #include "nsIClipboard.h"
 #include "nsIInputStream.h"
 #include "nsIParserUtils.h"
@@ -86,6 +87,16 @@ class ClipboardGetCallback : public nsIAsyncClipboardGetCallback {
   RefPtr<Promise> mPromise;
 };
 
+static nsTArray<nsCString> MandatoryDataTypesAsCStrings() {
+  // Mandatory data types defined in
+  // https://w3c.github.io/clipboard-apis/#mandatory-data-types-x. The types
+  // should be in the same order as kNonPlainTextExternalFormats in
+  // DataTransfer.
+  return nsTArray<nsCString>{nsLiteralCString(kHTMLMime),
+                             nsLiteralCString(kTextMime),
+                             nsLiteralCString(kPNGImageMime)};
+}
+
 class ClipboardGetCallbackForRead final : public ClipboardGetCallback {
  public:
   explicit ClipboardGetCallbackForRead(nsIGlobalObject* aGlobal,
@@ -109,11 +120,15 @@ class ClipboardGetCallbackForRead final : public ClipboardGetCallback {
     }
 
     AutoTArray<RefPtr<ClipboardItem::ItemEntry>, 3> entries;
-    for (const auto& format : flavorList) {
-      auto entry = MakeRefPtr<ClipboardItem::ItemEntry>(
-          mGlobal, NS_ConvertUTF8toUTF16(format));
-      entry->LoadDataFromSystemClipboard(aAsyncGetClipboardData);
-      entries.AppendElement(std::move(entry));
+    // We might reuse the request from DataTransfer created for paste event,
+    // which could contain more types that are not in the mandatory list.
+    for (const auto& format : MandatoryDataTypesAsCStrings()) {
+      if (flavorList.Contains(format)) {
+        auto entry = MakeRefPtr<ClipboardItem::ItemEntry>(
+            mGlobal, NS_ConvertUTF8toUTF16(format));
+        entry->LoadDataFromSystemClipboard(aAsyncGetClipboardData);
+        entries.AppendElement(std::move(entry));
+      }
     }
 
     RefPtr<Promise> p(std::move(mPromise));
@@ -214,6 +229,36 @@ NS_IMPL_ISUPPORTS(ClipboardGetCallbackForReadText, nsIAsyncClipboardGetCallback,
 
 }  // namespace
 
+void Clipboard::RequestRead(Promise& aPromise, const ReadRequestType& aType,
+                            nsPIDOMWindowInner& aOwner,
+                            nsIPrincipal& aSubjectPrincipal,
+                            nsIAsyncGetClipboardData& aRequest) {
+#ifdef DEBUG
+  bool isValid = false;
+  MOZ_ASSERT(NS_SUCCEEDED(aRequest.GetValid(&isValid)) && isValid);
+#endif
+
+  RefPtr<ClipboardGetCallback> callback;
+  switch (aType) {
+    case ReadRequestType::eRead: {
+      callback =
+          MakeRefPtr<ClipboardGetCallbackForRead>(aOwner.AsGlobal(), &aPromise);
+      break;
+    }
+    case ReadRequestType::eReadText: {
+      callback = MakeRefPtr<ClipboardGetCallbackForReadText>(&aPromise);
+      break;
+    }
+    default: {
+      MOZ_ASSERT_UNREACHABLE("Unknown read type");
+      return;
+    }
+  }
+
+  MOZ_ASSERT(callback);
+  callback->OnSuccess(&aRequest);
+}
+
 void Clipboard::RequestRead(Promise* aPromise, ReadRequestType aType,
                             nsPIDOMWindowInner* aOwner,
                             nsIPrincipal& aPrincipal) {
@@ -239,19 +284,14 @@ void Clipboard::RequestRead(Promise* aPromise, ReadRequestType aType,
 
       callback = MakeRefPtr<ClipboardGetCallbackForRead>(global, std::move(p));
       rv = clipboardService->AsyncGetData(
-          // Mandatory data types defined in
-          // https://w3c.github.io/clipboard-apis/#mandatory-data-types-x
-          AutoTArray<nsCString, 3>{nsDependentCString(kHTMLMime),
-                                   nsDependentCString(kTextMime),
-                                   nsDependentCString(kPNGImageMime)},
-          nsIClipboard::kGlobalClipboard, owner->GetWindowContext(),
-          &aPrincipal, callback);
+          MandatoryDataTypesAsCStrings(), nsIClipboard::kGlobalClipboard,
+          owner->GetWindowContext(), &aPrincipal, callback);
       break;
     }
     case ReadRequestType::eReadText: {
       callback = MakeRefPtr<ClipboardGetCallbackForReadText>(std::move(p));
       rv = clipboardService->AsyncGetData(
-          AutoTArray<nsCString, 1>{nsDependentCString(kTextMime)},
+          AutoTArray<nsCString, 1>{nsLiteralCString(kTextMime)},
           nsIClipboard::kGlobalClipboard, owner->GetWindowContext(),
           &aPrincipal, callback);
       break;
@@ -288,6 +328,24 @@ already_AddRefed<Promise> Clipboard::ReadHelper(nsIPrincipal& aSubjectPrincipal,
     return p.forget();
   }
 
+  // If a "paste" clipboard event is actively being processed, we're
+  // intentionally skipping permission/user-activation checks and giving the
+  // webpage access to the clipboard.
+  if (RefPtr<DataTransfer> dataTransfer =
+          nsGlobalWindowInner::Cast(owner)->GetCurrentPasteDataTransfer()) {
+    // If there is valid nsIAsyncGetClipboardData, use it directly.
+    if (nsCOMPtr<nsIAsyncGetClipboardData> asyncGetClipboardData =
+            dataTransfer->GetAsyncGetClipboardData()) {
+      bool isValid = false;
+      asyncGetClipboardData->GetValid(&isValid);
+      if (isValid) {
+        RequestRead(*p, aType, *owner, aSubjectPrincipal,
+                    *asyncGetClipboardData);
+        return p.forget();
+      }
+    }
+  }
+
   if (IsTestingPrefEnabledOrHasReadPermission(aSubjectPrincipal)) {
     MOZ_LOG(GetClipboardLog(), LogLevel::Debug,
             ("%s: testing pref enabled or has read permission", __FUNCTION__));
diff --git a/dom/events/Clipboard.h b/dom/events/Clipboard.h
index 2df4df1ec5..a9952e6052 100644
--- a/dom/events/Clipboard.h
+++ b/dom/events/Clipboard.h
@@ -13,7 +13,8 @@
 #include "mozilla/Logging.h"
 #include "mozilla/RefPtr.h"
 #include "mozilla/UniquePtr.h"
-#include "mozilla/dom/DataTransfer.h"
+
+class nsIAsyncGetClipboardData;
 
 namespace mozilla::dom {
 
@@ -75,6 +76,10 @@ class Clipboard : public DOMEventTargetHelper {
 
   void RequestRead(Promise* aPromise, ReadRequestType aType,
                    nsPIDOMWindowInner* aOwner, nsIPrincipal& aPrincipal);
+
+  void RequestRead(Promise& aPromise, const ReadRequestType& aType,
+                   nsPIDOMWindowInner& aOwner, nsIPrincipal& aSubjectPrincipal,
+                   nsIAsyncGetClipboardData& aRequest);
 };
 
 }  // namespace mozilla::dom
diff --git a/dom/events/DataTransfer.cpp b/dom/events/DataTransfer.cpp
index ad8c7059da..ba56575749 100644
--- a/dom/events/DataTransfer.cpp
+++ b/dom/events/DataTransfer.cpp
@@ -622,52 +622,64 @@ already_AddRefed<DataTransfer> DataTransfer::MozCloneForEvent(
 }
 
 // The order of the types matters. `kFileMime` needs to be one of the first two
-// types.
-static const char* kNonPlainTextExternalFormats[] = {
-    kCustomTypesMime, kFileMime, kHTMLMime,     kRTFMime,  kURLMime,
-    kURLDataMime,     kTextMime, kPNGImageMime, kPDFJSMime};
-
-/* static */
-void DataTransfer::GetExternalClipboardFormats(const int32_t& aWhichClipboard,
-                                               const bool& aPlainTextOnly,
-                                               nsTArray<nsCString>* aResult) {
-  MOZ_ASSERT(aResult);
-
+// types. And the order should be the same as the types order defined in
+// MandatoryDataTypesAsCStrings() for Clipboard API.
+static const nsCString kNonPlainTextExternalFormats[] = {
+    nsLiteralCString(kCustomTypesMime), nsLiteralCString(kFileMime),
+    nsLiteralCString(kHTMLMime),        nsLiteralCString(kRTFMime),
+    nsLiteralCString(kURLMime),         nsLiteralCString(kURLDataMime),
+    nsLiteralCString(kTextMime),        nsLiteralCString(kPNGImageMime),
+    nsLiteralCString(kPDFJSMime)};
+
+void DataTransfer::GetExternalClipboardFormats(const bool& aPlainTextOnly,
+                                               nsTArray<nsCString>& aResult) {
   // NOTE: When you change this method, you may need to change
   //       GetExternalTransferableFormats() too since those methods should
   //       work similarly.
 
+  MOZ_ASSERT(!mAsyncGetClipboardData);
+
+  RefPtr<WindowContext> wc = GetWindowContext();
+  if (NS_WARN_IF(!wc)) {
+    MOZ_ASSERT_UNREACHABLE(
+        "How could this DataTransfer be created with a non-window global?");
+    return;
+  }
+
   nsCOMPtr<nsIClipboard> clipboard =
       do_GetService("@mozilla.org/widget/clipboard;1");
-  if (!clipboard || aWhichClipboard < 0) {
+  if (!clipboard || mClipboardType < 0) {
     return;
   }
 
+  nsresult rv = NS_ERROR_FAILURE;
+  nsCOMPtr<nsIAsyncGetClipboardData> asyncGetClipboardData;
   if (aPlainTextOnly) {
-    bool hasType;
-    AutoTArray<nsCString, 1> textMime = {nsDependentCString(kTextMime)};
-    nsresult rv =
-        clipboard->HasDataMatchingFlavors(textMime, aWhichClipboard, &hasType);
-    NS_SUCCEEDED(rv);
-    if (hasType) {
-      aResult->AppendElement(kTextMime);
-    }
+    rv = clipboard->GetDataSnapshotSync(
+        AutoTArray<nsCString, 1>{nsLiteralCString(kTextMime)}, mClipboardType,
+        wc, getter_AddRefs(asyncGetClipboardData));
+  } else {
+    AutoTArray<nsCString, ArrayLength(kNonPlainTextExternalFormats)> formats;
+    formats.AppendElements(Span<const nsCString>(kNonPlainTextExternalFormats));
+    rv = clipboard->GetDataSnapshotSync(formats, mClipboardType, wc,
+                                        getter_AddRefs(asyncGetClipboardData));
+  }
+
+  if (NS_FAILED(rv) || !asyncGetClipboardData) {
     return;
   }
 
-  // If not plain text only, then instead check all the other types
-  for (uint32_t f = 0; f < mozilla::ArrayLength(kNonPlainTextExternalFormats);
-       ++f) {
-    bool hasType;
-    AutoTArray<nsCString, 1> format = {
-        nsDependentCString(kNonPlainTextExternalFormats[f])};
-    nsresult rv =
-        clipboard->HasDataMatchingFlavors(format, aWhichClipboard, &hasType);
-    NS_SUCCEEDED(rv);
-    if (hasType) {
-      aResult->AppendElement(kNonPlainTextExternalFormats[f]);
+  // Order is important for DataTransfer; ensure the returned list items follow
+  // the sequence specified in kNonPlainTextExternalFormats.
+  AutoTArray<nsCString, ArrayLength(kNonPlainTextExternalFormats)> flavors;
+  asyncGetClipboardData->GetFlavorList(flavors);
+  for (const auto& format : kNonPlainTextExternalFormats) {
+    if (flavors.Contains(format)) {
+      aResult.AppendElement(format);
     }
   }
+
+  mAsyncGetClipboardData = asyncGetClipboardData;
 }
 
 /* static */
@@ -695,10 +707,10 @@ void DataTransfer::GetExternalTransferableFormats(
   }
 
   // If not plain text only, then instead check all the other types
-  for (const char* format : kNonPlainTextExternalFormats) {
-    auto index = flavors.IndexOf(nsCString(format));
+  for (const auto& format : kNonPlainTextExternalFormats) {
+    auto index = flavors.IndexOf(format);
     if (index != flavors.NoIndex) {
-      aResult->AppendElement(nsCString(format));
+      aResult->AppendElement(format);
     }
   }
 }
@@ -1192,7 +1204,10 @@ void DataTransfer::Disconnect() {
   }
 }
 
-void DataTransfer::ClearAll() { mItems->ClearAllItems(); }
+void DataTransfer::ClearAll() {
+  mItems->ClearAllItems();
+  mAsyncGetClipboardData = nullptr;
+}
 
 uint32_t DataTransfer::MozItemCount() const { return mItems->MozItemCount(); }
 
@@ -1260,6 +1275,24 @@ already_AddRefed<nsIGlobalObject> DataTransfer::GetGlobal() const {
   return global.forget();
 }
 
+already_AddRefed<WindowContext> DataTransfer::GetWindowContext() const {
+  nsCOMPtr<nsIGlobalObject> global = GetGlobal();
+  if (!global) {
+    return nullptr;
+  }
+
+  const auto* innerWindow = global->GetAsInnerWindow();
+  if (!innerWindow) {
+    return nullptr;
+  }
+
+  return do_AddRef(innerWindow->GetWindowContext());
+}
+
+nsIAsyncGetClipboardData* DataTransfer::GetAsyncGetClipboardData() const {
+  return mAsyncGetClipboardData;
+}
+
 nsresult DataTransfer::CacheExternalData(const char* aFormat, uint32_t aIndex,
                                          nsIPrincipal* aPrincipal,
                                          bool aHidden) {
@@ -1357,20 +1390,13 @@ void DataTransfer::CacheExternalClipboardFormats(bool aPlainTextOnly) {
                "caching clipboard data for invalid event");
 
   nsCOMPtr<nsIPrincipal> sysPrincipal = nsContentUtils::GetSystemPrincipal();
-
   nsTArray<nsCString> typesArray;
-
-  if (XRE_IsContentProcess()) {
-    ContentChild::GetSingleton()->SendGetExternalClipboardFormats(
-        mClipboardType, aPlainTextOnly, &typesArray);
-  } else {
-    GetExternalClipboardFormats(mClipboardType, aPlainTextOnly, &typesArray);
-  }
-
+  GetExternalClipboardFormats(aPlainTextOnly, typesArray);
   if (aPlainTextOnly) {
     // The only thing that will be in types is kTextMime
     MOZ_ASSERT(typesArray.IsEmpty() || typesArray.Length() == 1);
     if (typesArray.Length() == 1) {
+      MOZ_ASSERT(typesArray.Contains(kTextMime));
       CacheExternalData(kTextMime, 0, sysPrincipal, false);
     }
     return;
diff --git a/dom/events/DataTransfer.h b/dom/events/DataTransfer.h
index ea0368216a..7ff2bff54b 100644
--- a/dom/events/DataTransfer.h
+++ b/dom/events/DataTransfer.h
@@ -23,6 +23,7 @@
 #include "mozilla/dom/DataTransferItemList.h"
 #include "mozilla/dom/File.h"
 
+class nsIAsyncGetClipboardData;
 class nsINode;
 class nsITransferable;
 class nsILoadContext;
@@ -386,14 +387,6 @@ class DataTransfer final : public nsISupports, public nsWrapperCache {
   }
   bool MozShowFailAnimation() const { return mShowFailAnimation; }
 
-  // Retrieve a list of clipboard formats supported
-  //
-  // If kFileMime is supported, then it will be placed either at
-  // index 0 or at index 1 in aResult
-  static void GetExternalClipboardFormats(const int32_t& aWhichClipboard,
-                                          const bool& aPlainTextOnly,
-                                          nsTArray<nsCString>* aResult);
-
   // Retrieve a list of supporting formats in aTransferable.
   //
   // If kFileMime is supported, then it will be placed either at
@@ -428,7 +421,18 @@ class DataTransfer final : public nsISupports, public nsWrapperCache {
 
   already_AddRefed<nsIGlobalObject> GetGlobal() const;
 
+  already_AddRefed<WindowContext> GetWindowContext() const;
+
+  nsIAsyncGetClipboardData* GetAsyncGetClipboardData() const;
+
  protected:
+  // Retrieve a list of clipboard formats supported
+  //
+  // If kFileMime is supported, then it will be placed either at
+  // index 0 or at index 1 in aResult
+  void GetExternalClipboardFormats(const bool& aPlainTextOnly,
+                                   nsTArray<nsCString>& aResult);
+
   // caches text and uri-list data formats that exist in the drag service or
   // clipboard for retrieval later.
   nsresult CacheExternalData(const char* aFormat, uint32_t aIndex,
@@ -506,6 +510,11 @@ class DataTransfer final : public nsISupports, public nsWrapperCache {
   // drag and drop.
   int32_t mClipboardType;
 
+  // The nsIAsyncGetClipboardData that is used for getting clipboard formats.
+  // XXXedgar we should get the actual data from this in the future, see bug
+  // 1879401.
+  nsCOMPtr<nsIAsyncGetClipboardData> mAsyncGetClipboardData;
+
   // The items contained with the DataTransfer
   RefPtr<DataTransferItemList> mItems;
 
diff --git a/dom/events/EventListenerService.cpp b/dom/events/EventListenerService.cpp
index 7e4919d938..3398f0dd02 100644
--- a/dom/events/EventListenerService.cpp
+++ b/dom/events/EventListenerService.cpp
@@ -219,21 +219,6 @@ EventListenerService::GetListenerInfoFor(
   return NS_OK;
 }
 
-NS_IMETHODIMP
-EventListenerService::GetEventTargetChainFor(
-    EventTarget* aEventTarget, bool aComposed,
-    nsTArray<RefPtr<EventTarget>>& aOutArray) {
-  NS_ENSURE_ARG(aEventTarget);
-  WidgetEvent event(true, eVoidEvent);
-  event.SetComposed(aComposed);
-  nsTArray<EventTarget*> targets;
-  nsresult rv = EventDispatcher::Dispatch(aEventTarget, nullptr, &event,
-                                          nullptr, nullptr, nullptr, &targets);
-  NS_ENSURE_SUCCESS(rv, rv);
-  aOutArray.AppendElements(targets);
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 EventListenerService::HasListenersFor(EventTarget* aEventTarget,
                                       const nsAString& aType, bool* aRetVal) {
@@ -257,54 +242,6 @@ static already_AddRefed<EventListener> ToEventListener(
   return listener.forget();
 }
 
-NS_IMETHODIMP
-EventListenerService::AddSystemEventListener(EventTarget* aTarget,
-                                             const nsAString& aType,
-                                             JS::Handle<JS::Value> aListener,
-                                             bool aUseCapture, JSContext* aCx) {
-  MOZ_ASSERT(aTarget, "Missing target");
-
-  NS_ENSURE_TRUE(aTarget, NS_ERROR_UNEXPECTED);
-
-  RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
-  if (!listener) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
-  EventListenerManager* manager = aTarget->GetOrCreateListenerManager();
-  NS_ENSURE_STATE(manager);
-
-  EventListenerFlags flags = aUseCapture ? TrustedEventsAtSystemGroupCapture()
-                                         : TrustedEventsAtSystemGroupBubble();
-  manager->AddEventListenerByType(listener, aType, flags);
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-EventListenerService::RemoveSystemEventListener(EventTarget* aTarget,
-                                                const nsAString& aType,
-                                                JS::Handle<JS::Value> aListener,
-                                                bool aUseCapture,
-                                                JSContext* aCx) {
-  MOZ_ASSERT(aTarget, "Missing target");
-
-  NS_ENSURE_TRUE(aTarget, NS_ERROR_UNEXPECTED);
-
-  RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
-  if (!listener) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
-  EventListenerManager* manager = aTarget->GetExistingListenerManager();
-  if (manager) {
-    EventListenerFlags flags = aUseCapture ? TrustedEventsAtSystemGroupCapture()
-                                           : TrustedEventsAtSystemGroupBubble();
-    manager->RemoveEventListenerByType(listener, aType, flags);
-  }
-
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 EventListenerService::AddListenerForAllEvents(
     EventTarget* aTarget, JS::Handle<JS::Value> aListener, bool aUseCapture,
diff --git a/dom/events/EventNameList.h b/dom/events/EventNameList.h
index 6c9119d5f9..92c76d000e 100644
--- a/dom/events/EventNameList.h
+++ b/dom/events/EventNameList.h
@@ -228,6 +228,9 @@ EVENT(lostpointercapture, ePointerLostCapture, EventNameType_All,
       ePointerEventClass)
 EVENT(selectstart, eSelectStart, EventNameType_HTMLXUL, eBasicEventClass)
 
+EVENT(contextlost, eContextLost, EventNameType_HTML, eBasicEventClass)
+EVENT(contextrestored, eContextRestored, EventNameType_HTML, eBasicEventClass)
+
 // Not supported yet; probably never because "wheel" is a better idea.
 // EVENT(mousewheel)
 EVENT(pause, ePause, EventNameType_HTML, eBasicEventClass)
diff --git a/dom/events/PointerEventHandler.cpp b/dom/events/PointerEventHandler.cpp
index 6c537bfb67..ef6f2b12c0 100644
--- a/dom/events/PointerEventHandler.cpp
+++ b/dom/events/PointerEventHandler.cpp
@@ -610,15 +610,16 @@ EventMessage PointerEventHandler::ToPointerEventMessage(
 
 /* static */
 void PointerEventHandler::DispatchPointerFromMouseOrTouch(
-    PresShell* aShell, nsIFrame* aFrame, nsIContent* aContent,
-    WidgetGUIEvent* aEvent, bool aDontRetargetEvents, nsEventStatus* aStatus,
-    nsIContent** aTargetContent) {
-  MOZ_ASSERT(aFrame || aContent);
-  MOZ_ASSERT(aEvent);
+    PresShell* aShell, nsIFrame* aEventTargetFrame,
+    nsIContent* aEventTargetContent, WidgetGUIEvent* aMouseOrTouchEvent,
+    bool aDontRetargetEvents, nsEventStatus* aStatus,
+    nsIContent** aMouseOrTouchEventTarget /* = nullptr */) {
+  MOZ_ASSERT(aEventTargetFrame || aEventTargetContent);
+  MOZ_ASSERT(aMouseOrTouchEvent);
 
   EventMessage pointerMessage = eVoidEvent;
-  if (aEvent->mClass == eMouseEventClass) {
-    WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+  if (aMouseOrTouchEvent->mClass == eMouseEventClass) {
+    WidgetMouseEvent* mouseEvent = aMouseOrTouchEvent->AsMouseEvent();
     // Don't dispatch pointer events caused by a mouse when simulating touch
     // devices in RDM.
     Document* doc = aShell->GetDocument();
@@ -636,7 +637,7 @@ void PointerEventHandler::DispatchPointerFromMouseOrTouch(
     // 2. We don't synthesize pointer events for those events that are not
     //    dispatched to DOM.
     if (!mouseEvent->convertToPointer ||
-        !aEvent->IsAllowedToDispatchDOMEvent()) {
+        !aMouseOrTouchEvent->IsAllowedToDispatchDOMEvent()) {
       return;
     }
 
@@ -648,20 +649,20 @@ void PointerEventHandler::DispatchPointerFromMouseOrTouch(
     InitPointerEventFromMouse(&event, mouseEvent, pointerMessage);
     event.convertToPointer = mouseEvent->convertToPointer = false;
     RefPtr<PresShell> shell(aShell);
-    if (!aFrame) {
-      shell = PresShell::GetShellForEventTarget(nullptr, aContent);
+    if (!aEventTargetFrame) {
+      shell = PresShell::GetShellForEventTarget(nullptr, aEventTargetContent);
       if (!shell) {
         return;
       }
     }
-    PreHandlePointerEventsPreventDefault(&event, aEvent);
+    PreHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
     // Dispatch pointer event to the same target which is found by the
     // corresponding mouse event.
-    shell->HandleEventWithTarget(&event, aFrame, aContent, aStatus, true,
-                                 aTargetContent);
-    PostHandlePointerEventsPreventDefault(&event, aEvent);
-  } else if (aEvent->mClass == eTouchEventClass) {
-    WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+    shell->HandleEventWithTarget(&event, aEventTargetFrame, aEventTargetContent,
+                                 aStatus, true, aMouseOrTouchEventTarget);
+    PostHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
+  } else if (aMouseOrTouchEvent->mClass == eTouchEventClass) {
+    WidgetTouchEvent* touchEvent = aMouseOrTouchEvent->AsTouchEvent();
     // loop over all touches and dispatch pointer events on each touch
     // copy the event
     pointerMessage = PointerEventHandler::ToPointerEventMessage(touchEvent);
@@ -681,7 +682,7 @@ void PointerEventHandler::DispatchPointerFromMouseOrTouch(
       InitPointerEventFromTouch(event, *touchEvent, *touch, i == 0);
       event.convertToPointer = touch->convertToPointer = false;
       event.mCoalescedWidgetEvents = touch->mCoalescedWidgetEvents;
-      if (aEvent->mMessage == eTouchStart) {
+      if (aMouseOrTouchEvent->mMessage == eTouchStart) {
         // We already did hit test for touchstart in PresShell. We should
         // dispatch pointerdown to the same target as touchstart.
         nsCOMPtr<nsIContent> content =
@@ -696,18 +697,22 @@ void PointerEventHandler::DispatchPointerFromMouseOrTouch(
           continue;
         }
 
-        PreHandlePointerEventsPreventDefault(&event, aEvent);
+        PreHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
         shell->HandleEventWithTarget(&event, frame, content, aStatus, true,
-                                     nullptr);
-        PostHandlePointerEventsPreventDefault(&event, aEvent);
+                                     aMouseOrTouchEventTarget);
+        PostHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
       } else {
         // We didn't hit test for other touch events. Spec doesn't mention that
         // all pointer events should be dispatched to the same target as their
         // corresponding touch events. Call PresShell::HandleEvent so that we do
         // hit test for pointer events.
-        PreHandlePointerEventsPreventDefault(&event, aEvent);
-        shell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus);
-        PostHandlePointerEventsPreventDefault(&event, aEvent);
+        // FIXME: If aDontRetargetEvents is true and the event is fired on
+        // different document, we cannot track the pointer event target when
+        // it's removed from the tree.
+        PreHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
+        shell->HandleEvent(aEventTargetFrame, &event, aDontRetargetEvents,
+                           aStatus);
+        PostHandlePointerEventsPreventDefault(&event, aMouseOrTouchEvent);
       }
     }
   }
diff --git a/dom/events/PointerEventHandler.h b/dom/events/PointerEventHandler.h
index d1a5b31b5a..0211bfe0d8 100644
--- a/dom/events/PointerEventHandler.h
+++ b/dom/events/PointerEventHandler.h
@@ -168,11 +168,39 @@ class PointerEventHandler final {
   static void PostHandlePointerEventsPreventDefault(
       WidgetPointerEvent* aPointerEvent, WidgetGUIEvent* aMouseOrTouchEvent);
 
-  MOZ_CAN_RUN_SCRIPT
-  static void DispatchPointerFromMouseOrTouch(
-      PresShell* aShell, nsIFrame* aFrame, nsIContent* aContent,
-      WidgetGUIEvent* aEvent, bool aDontRetargetEvents, nsEventStatus* aStatus,
-      nsIContent** aTargetContent);
+  /**
+   * Dispatch a pointer event for aMouseOrTouchEvent to aEventTargetContent.
+   *
+   * @param aShell              The PresShell which is handling the event.
+   * @param aEventTargetFrame   The frame for aEventTargetContent.
+   * @param aEventTargetContent The event target node.
+   * @param aMouseOrTouchEvent  A mouse or touch event.
+   * @param aDontRetargetEvents If true, this won't dispatch event with
+   *                            different PresShell from aShell.  Otherwise,
+   *                            pointer events may be fired on different
+   *                            document if and only if aMouseOrTOuchEvent is a
+   *                            touch event except eTouchStart.
+   * @param aState              [out] The result of the pointer event.
+   * @param aMouseOrTouchEventTarget
+   *                            [out] The event target for the following mouse
+   *                            or touch event. If aEventTargetContent has not
+   *                            been removed from the tree, this is always set
+   *                            to it. If aEventTargetContent is removed from
+   *                            the tree and aMouseOrTouchEvent is a mouse
+   *                            event, this is set to inclusive ancestor of
+   *                            aEventTargetContent which is still connected.
+   *                            If aEventTargetContent is removed from the tree
+   *                            and aMouseOrTouchEvent is a touch event, this is
+   *                            set to aEventTargetContent because touch event
+   *                            should be dispatched even on disconnected node.
+   *                            FIXME: If the event is a touch event but the
+   *                            message is not eTouchStart, this won't be set.
+   */
+  MOZ_CAN_RUN_SCRIPT static void DispatchPointerFromMouseOrTouch(
+      PresShell* aShell, nsIFrame* aEventTargetFrame,
+      nsIContent* aEventTargetContent, WidgetGUIEvent* aMouseOrTouchEvent,
+      bool aDontRetargetEvents, nsEventStatus* aStatus,
+      nsIContent** aMouseOrTouchEventTarget = nullptr);
 
   static void InitPointerEventFromMouse(WidgetPointerEvent* aPointerEvent,
                                         WidgetMouseEvent* aMouseEvent,
diff --git a/dom/events/TouchEvent.cpp b/dom/events/TouchEvent.cpp
index 24068703be..6e50c81db8 100644
--- a/dom/events/TouchEvent.cpp
+++ b/dom/events/TouchEvent.cpp
@@ -233,7 +233,7 @@ bool TouchEvent::PrefEnabled(nsIDocShell* aDocShell) {
       // The touch screen data seems to be inaccurate in the parent process,
       // and we really need the crash annotation in child processes.
       if (firstTime && !XRE_IsParentProcess()) {
-        CrashReporter::AnnotateCrashReport(
+        CrashReporter::RecordAnnotationBool(
             CrashReporter::Annotation::HasDeviceTouchScreen, enabled);
         firstTime = false;
       }
diff --git a/dom/events/nsIEventListenerService.idl b/dom/events/nsIEventListenerService.idl
index ead3cc4af1..b8f36e5d0e 100644
--- a/dom/events/nsIEventListenerService.idl
+++ b/dom/events/nsIEventListenerService.idl
@@ -74,42 +74,12 @@ interface nsIEventListenerService : nsISupports
    */
   Array<nsIEventListenerInfo> getListenerInfoFor(in EventTarget aEventTarget);
 
-  /**
-   * Returns an array of event targets.
-   * aEventTarget will be at index 0.
-   * The objects are the ones that would be used as DOMEvent.currentTarget while
-   * dispatching an event to aEventTarget
-   * @note Some events, especially 'load', may actually have a shorter
-   *       event target chain than what this methods returns.
-   */
-  [can_run_script]
-  Array<EventTarget> getEventTargetChainFor(in EventTarget aEventTarget,
-                                            in boolean composed);
-
   /**
    * Returns true if a event target has any listener for the given type.
    */
   boolean hasListenersFor(in EventTarget aEventTarget,
                           in AString aType);
 
-  /**
-   * Add a system-group eventlistener to a event target.
-   */
-  [implicit_jscontext]
-  void addSystemEventListener(in EventTarget target,
-                              in AString type,
-                              in jsval listener,
-                              in boolean useCapture);
-
-  /**
-   * Remove a system-group eventlistener from a event target.
-   */
-  [implicit_jscontext]
-  void removeSystemEventListener(in EventTarget target,
-                                 in AString type,
-                                 in jsval listener,
-                                 in boolean useCapture);
-
   [implicit_jscontext]
   void addListenerForAllEvents(in EventTarget target,
                                in jsval listener,
diff --git a/dom/events/test/clipboard/browser_navigator_clipboard_contextmenu_suppression.js b/dom/events/test/clipboard/browser_navigator_clipboard_contextmenu_suppression.js
index f504e499c9..97066cd2eb 100644
--- a/dom/events/test/clipboard/browser_navigator_clipboard_contextmenu_suppression.js
+++ b/dom/events/test/clipboard/browser_navigator_clipboard_contextmenu_suppression.js
@@ -238,16 +238,10 @@ add_task(async function test_context_menu_suppression_image() {
     await pasteButtonIsShown;
 
     info("Test read from same-origin frame before paste contextmenu is closed");
-    const clipboarCacheEnabled = SpecialPowers.getBoolPref(
-      "widget.clipboard.use-cached-data.enabled",
-      false
-    );
     // If the cached data is used, it uses type order in cached transferable.
     SimpleTest.isDeeply(
       await readTypes(browser.browsingContext.children[0]),
-      clipboarCacheEnabled
-        ? ["text/plain", "text/html", "image/png"]
-        : ["text/html", "text/plain", "image/png"],
+      ["text/html", "text/plain", "image/png"],
       "read from same-origin should just be resolved without showing paste contextmenu shown"
     );
 
@@ -262,3 +256,158 @@ add_task(async function test_context_menu_suppression_image() {
     );
   });
 });
+
+function testPasteContextMenuSuppressionPasteEvent(
+  aTriggerPasteFun,
+  aSuppress,
+  aMsg
+) {
+  add_task(async function test_context_menu_suppression_paste_event() {
+    await BrowserTestUtils.withNewTab(
+      kContentFileUrl,
+      async function (browser) {
+        info(`Write data by in cross-origin frame`);
+        const clipboardText = "X" + Math.random();
+        await SpecialPowers.spawn(
+          browser.browsingContext.children[1],
+          [clipboardText],
+          async text => {
+            content.document.notifyUserGestureActivation();
+            return content.eval(`navigator.clipboard.writeText("${text}");`);
+          }
+        );
+
+        info("Test read should show contextmenu");
+        let pasteButtonIsShown = waitForPasteContextMenu();
+        let readTextRequest = readText(browser);
+        await pasteButtonIsShown;
+
+        info("Click paste button, request should be resolved");
+        await promiseClickPasteButton();
+        is(await readTextRequest, clipboardText, "Request should be resolved");
+
+        info("Test read in paste event handler");
+        readTextRequest = SpecialPowers.spawn(browser, [], async () => {
+          content.document.notifyUserGestureActivation();
+          return content.eval(`
+          (() => {
+            return new Promise(resolve => {
+              document.addEventListener("paste", function(e) {
+                e.preventDefault();
+                resolve(navigator.clipboard.readText());
+              }, { once: true });
+            });
+          })();
+        `);
+        });
+
+        if (aSuppress) {
+          let listener = function (e) {
+            if (e.target.getAttribute("id") == kPasteMenuPopupId) {
+              ok(!aSuppress, "paste contextmenu should not be shown");
+            }
+          };
+          document.addEventListener("popupshown", listener);
+          info(`Trigger paste event by ${aMsg}`);
+          // trigger paste event
+          await aTriggerPasteFun(browser);
+          is(
+            await readTextRequest,
+            clipboardText,
+            "Request should be resolved"
+          );
+          document.removeEventListener("popupshown", listener);
+        } else {
+          let pasteButtonIsShown = waitForPasteContextMenu();
+          info(
+            `Trigger paste event by ${aMsg}, read should still show contextmenu`
+          );
+          // trigger paste event
+          await aTriggerPasteFun(browser);
+          await pasteButtonIsShown;
+
+          info("Click paste button, request should be resolved");
+          await promiseClickPasteButton();
+          is(
+            await readTextRequest,
+            clipboardText,
+            "Request should be resolved"
+          );
+        }
+
+        info("Test read should still show contextmenu");
+        pasteButtonIsShown = waitForPasteContextMenu();
+        readTextRequest = readText(browser);
+        await pasteButtonIsShown;
+
+        info("Click paste button, request should be resolved");
+        await promiseClickPasteButton();
+        is(await readTextRequest, clipboardText, "Request should be resolved");
+      }
+    );
+  });
+}
+
+// If platform supports selection clipboard, the middle click paste the content
+// from selection clipboard instead, in such case, we don't suppress the
+// contextmenu when access global clipboard via async clipboard API.
+if (
+  !Services.clipboard.isClipboardTypeSupported(
+    Services.clipboard.kSelectionClipboard
+  )
+) {
+  testPasteContextMenuSuppressionPasteEvent(
+    async browser => {
+      await SpecialPowers.pushPrefEnv({
+        set: [["middlemouse.paste", true]],
+      });
+
+      await SpecialPowers.spawn(browser, [], async () => {
+        EventUtils.synthesizeMouse(
+          content.document.documentElement,
+          1,
+          1,
+          { button: 1 },
+          content.window
+        );
+      });
+    },
+    true,
+    "middle click"
+  );
+}
+
+testPasteContextMenuSuppressionPasteEvent(
+  async browser => {
+    await EventUtils.synthesizeAndWaitKey(
+      "v",
+      kIsMac ? { accelKey: true } : { ctrlKey: true }
+    );
+  },
+  true,
+  "keyboard shortcut"
+);
+
+testPasteContextMenuSuppressionPasteEvent(
+  async browser => {
+    await SpecialPowers.spawn(browser, [], async () => {
+      return SpecialPowers.doCommand(content.window, "cmd_paste");
+    });
+  },
+  true,
+  "paste command"
+);
+
+testPasteContextMenuSuppressionPasteEvent(
+  async browser => {
+    await SpecialPowers.spawn(browser, [], async () => {
+      let div = content.document.createElement("div");
+      div.setAttribute("contenteditable", "true");
+      content.document.documentElement.appendChild(div);
+      div.focus();
+      return SpecialPowers.doCommand(content.window, "cmd_pasteNoFormatting");
+    });
+  },
+  false,
+  "pasteNoFormatting command"
+);
diff --git a/dom/events/test/mochitest.toml b/dom/events/test/mochitest.toml
index b6b9e58368..53675a8f49 100644
--- a/dom/events/test/mochitest.toml
+++ b/dom/events/test/mochitest.toml
@@ -472,6 +472,9 @@ skip-if = [
   "http2",
 ]
 
+["test_mouse_events_after_touchend.html"]
+skip-if = ["os == 'mac'"] # Bug 1881864
+
 ["test_mouse_over_at_removing_down_target.html"]
 
 ["test_moving_and_expanding_selection_per_page.html"]
diff --git a/dom/events/test/pointerevents/mochitest_support_external.js b/dom/events/test/pointerevents/mochitest_support_external.js
index 7f22166fdd..7a758a8c5f 100644
--- a/dom/events/test/pointerevents/mochitest_support_external.js
+++ b/dom/events/test/pointerevents/mochitest_support_external.js
@@ -2,6 +2,8 @@
 // to tests on auto MochiTest system with minimum changes.
 // Author: Maksim Lebedev <alessarik@gmail.com>
 
+/* eslint-disable mozilla/no-comparison-or-assignment-inside-ok */
+
 // Function allows to prepare our tests after load document
 addEventListener(
   "load",
diff --git a/dom/events/test/pointerevents/test_bug1315862.html b/dom/events/test/pointerevents/test_bug1315862.html
index 92d61a518f..657947c156 100644
--- a/dom/events/test/pointerevents/test_bug1315862.html
+++ b/dom/events/test/pointerevents/test_bug1315862.html
@@ -36,10 +36,10 @@ function runTests() {
 
   let target = iframe.contentDocument.body.firstChild;
   allPointerEvents.forEach((event, idx, arr) => {
-    SpecialPowers.addSystemEventListener(target, event, () => {
+    SpecialPowers.wrap(target).addEventListener(event, () => {
       ok(false, "Shouldn't dispatch " + event + " in the system group");
       receivePointerEvents = true;
-    });
+    }, { mozSystemGroup: true });
   });
   target.addEventListener("pointerdown", (e) => {
     target.setPointerCapture(e.pointerId);
diff --git a/dom/events/test/test_accesskey.html b/dom/events/test/test_accesskey.html
index cdfff54a28..4d382f2270 100644
--- a/dom/events/test/test_accesskey.html
+++ b/dom/events/test/test_accesskey.html
@@ -143,7 +143,7 @@ add_task(async function modifyAccessKey() {
 add_task(async function file_picker() {
   const file = document.getElementById("file");
   const MockFilePicker = SpecialPowers.MockFilePicker;
-  MockFilePicker.init(window);
+  MockFilePicker.init(SpecialPowers.wrap(window).browsingContext);
   MockFilePicker.returnValue = MockFilePicker.returnCancel;
 
   let clicked = false;
diff --git a/dom/events/test/test_bug226361.xhtml b/dom/events/test/test_bug226361.xhtml
index 143a485757..c2c19ee2a7 100644
--- a/dom/events/test/test_bug226361.xhtml
+++ b/dom/events/test/test_bug226361.xhtml
@@ -20,7 +20,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=226361
 
 </p>
 <div id="content" style="display: none">
-  
+
 </div>
 <pre id="test">
 <script type="application/javascript">
@@ -43,8 +43,11 @@ function tab_to(id) {
 }
 
 function tab_iframe() {
-  doc = document;
-  tab_to('iframe');
+  let canTabMoveFocusToRootElement = !SpecialPowers.getBoolPref("dom.disable_tab_focus_to_root_element");
+  if (canTabMoveFocusToRootElement) {
+    doc = document;
+    tab_to('iframe');
+  }
 
   // inside iframe
   doc = document.getElementById('iframe').contentDocument
diff --git a/dom/events/test/test_bug238987.html b/dom/events/test/test_bug238987.html
index b2712a25d0..34f870eeac 100644
--- a/dom/events/test/test_bug238987.html
+++ b/dom/events/test/test_bug238987.html
@@ -22,7 +22,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=238987
 
   var shouldStop = false;
   var activateShift = false;
-  var expectedResult = "i1,i2,i3,i4,i5,i6,i7,i8,number,i9,i10,i11,i12";
+  var expectedResult = "i1,i2,i3,i4,i5,i7,i8,number,i9,i10,i11,i12";
   var forwardFocusArray = expectedResult.split(",");
   var backwardFocusArray = expectedResult.split(",");
   var forwardBlurArray = expectedResult.split(",");
diff --git a/dom/events/test/test_bug336682.js b/dom/events/test/test_bug336682.js
index e673f1eb99..11bd7d46bb 100644
--- a/dom/events/test/test_bug336682.js
+++ b/dom/events/test/test_bug336682.js
@@ -4,6 +4,8 @@
  * Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/licenses/publicdomain/
  */
+/* eslint-disable mozilla/no-comparison-or-assignment-inside-ok */
+
 var gState = 0;
 /**
  * After all the on/offline handlers run,
diff --git a/dom/events/test/test_bug448602.html b/dom/events/test/test_bug448602.html
index 18b4cb2d2f..452a361a52 100644
--- a/dom/events/test/test_bug448602.html
+++ b/dom/events/test/test_bug448602.html
@@ -174,28 +174,7 @@ function runTests() {
   is(SpecialPowers.unwrap(infos[0].listenerObject), l,
      "Should have the right listener object (4)");
 
-  // Event target chain tests
   l3 = document.getElementById("testlevel3");
-  var textnode = l3.firstChild;
-  var chain = els.getEventTargetChainFor(textnode, true);
-  ok(chain.length > 3, "Too short event target chain.");
-  ok(SpecialPowers.compare(chain[0], textnode), "Wrong chain item (1)");
-  ok(SpecialPowers.compare(chain[1], l3), "Wrong chain item (2)");
-  ok(SpecialPowers.compare(chain[2], l2), "Wrong chain item (3)");
-  ok(SpecialPowers.compare(chain[3], root), "Wrong chain item (4)");
-
-  var hasDocumentInChain = false;
-  var hasWindowInChain = false;
-  for (var i = 0; i < chain.length; ++i) {
-    if (SpecialPowers.compare(chain[i], document)) {
-      hasDocumentInChain = true;
-    } else if (SpecialPowers.compare(chain[i], window)) {
-      hasWindowInChain = true;
-    }
-  }
-
-  ok(hasDocumentInChain, "Should have document in event target chain!");
-  ok(hasWindowInChain, "Should have window in event target chain!");
 
   try {
     els.getListenerInfoFor(null);
diff --git a/dom/events/test/test_mouse_events_after_touchend.html b/dom/events/test/test_mouse_events_after_touchend.html
new file mode 100644
index 0000000000..146c37e489
--- /dev/null
+++ b/dom/events/test/test_mouse_events_after_touchend.html
@@ -0,0 +1,232 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Tests for mouse events after touchend</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/paint_listener.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+<style>
+#parent, #child {
+  width: 300px;
+  height: 64px;
+  padding: 16px;
+}
+#parent {
+  background-color: black;
+}
+#child {
+  background-color: gray;
+}
+</style>
+<script>
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("Required for waiting to prevent double tap at second tap");
+SimpleTest.waitForFocus(async () => {
+  function stringifyEvent(event) {
+    return `{ type: ${event.type}, target: ${
+      event.target.id || event.target.nodeName
+    }${
+      event.detail !== undefined ? `, detail: ${event.detail}` : ""
+    }${
+      event.button !== undefined ? `, button: ${event.button}` : ""
+    }${
+      event.buttons !== undefined ? `, buttons: ${event.buttons}` : ""
+    } }`;
+  }
+  function stringifyEvents(arrayOfEvents) {
+    if (!arrayOfEvents.length) {
+      return "[]";
+    }
+    let ret = "";
+    for (const event of arrayOfEvents) {
+      if (ret === "") {
+        ret = "[ ";
+      } else {
+        ret += ", ";
+      }
+      ret += stringifyEvent(event);
+    }
+    return ret + " ]";
+  }
+
+  let events = [];
+  for (const type of ["mousemove",
+                      "mousedown",
+                      "mouseup",
+                      "click",
+                      "dblclick",
+                      "contextmenu",
+                      "touchend"]) {
+    if (type == "touchend") {
+      addEventListener(type, event => {
+        info(`Received: ${stringifyEvent(event)}`);
+        events.push({type, target: event.target});
+      }, {capture: true});
+    } else {
+      addEventListener(type, event => {
+        info(`Received: ${stringifyEvent(event)}`);
+        events.push({
+          type: event.type,
+          target: event.target,
+          detail: event.detail,
+          button: event.button,
+          buttons: event.buttons,
+        });
+      }, {capture: true});
+    }
+  }
+
+  function shiftEventsBefore(arrayOfEvents, aType) {
+    const index = arrayOfEvents.findIndex(event => event.type == aType);
+    if (index <= 0) {
+      return [];
+    }
+    let ret = [];
+    for (let i = 0; i < index; i++) {
+      ret.push(arrayOfEvents.shift());
+    }
+    return ret;
+  }
+
+  const parent = document.getElementById("parent");
+  const child = document.getElementById("child");
+
+  function promiseEvent(aType) {
+    return new Promise(resolve =>
+      addEventListener(aType, resolve, {once: true})
+    );
+  }
+
+  async function promiseFlushingAPZGestureState() {
+    await promiseApzFlushedRepaints();
+    // Wait for a while to avoid that the next tap will be treated as 2nd tap of
+    // a double tap.
+    return new Promise(
+      resolve => setTimeout(
+        resolve,
+        // NOTE: x1.0 is not enough to avoid intermittent failures.
+        SpecialPowers.getIntPref("apz.max_tap_time") * 1.2
+      )
+    );
+  }
+
+  await waitUntilApzStable();
+  for (const prefValue of [true, false]) {
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["test.events.async.enabled", prefValue],
+        ["ui.click_hold_context_menus.delay", 15000], // disable long tap
+      ]
+    });
+    const desc = `(test.events.async.enabled=${prefValue})`;
+
+    await (async function test_single_tap() {
+      await promiseFlushingAPZGestureState();
+      info("test_single_tap: testing...");
+      events = [];
+      const waitForClick = promiseEvent("click");
+      synthesizeTouch(child, 5, 5);
+      await waitForClick;
+      is(
+        stringifyEvents(events),
+        stringifyEvents([
+          { type: "touchend", target: child },
+          { type: "mousemove", target: child, detail: 0, button: 0, buttons: 0 },
+          { type: "mousedown", target: child, detail: 1, button: 0, buttons: 1 },
+          { type: "mouseup", target: child, detail: 1, button: 0, buttons: 0 },
+          { type: "click", target: child, detail: 1, button: 0, buttons: 0 },
+        ]),
+        `Single tap should cause a click ${desc}`
+      );
+    })();
+
+    await (async function test_single_tap_with_consuming_touchstart() {
+      await promiseFlushingAPZGestureState();
+      info("test_single_tap_with_consuming_touchstart: testing...");
+      events = [];
+      const waitForTouchEnd = promiseEvent("touchend");
+      child.addEventListener("touchstart", event => {
+        event.preventDefault();
+      }, {once: true});
+      synthesizeTouch(child, 5, 5);
+      await waitForTouchEnd;
+      const result = stringifyEvents(events);
+      const expected = stringifyEvents([{ type: "touchend", target: child }]);
+      // If testing this with APZ, the result is really unstable. Let's allow to
+      // fail for now.
+      (prefValue && result != expected ? todo_is : is)(
+        result,
+        expected,
+        `Single tap should not cause mouse events if touchstart is consumed ${desc}`
+      );
+    })();
+
+
+    await (async function test_single_tap_with_consuming_touchend() {
+      await promiseFlushingAPZGestureState();
+      info("test_single_tap_with_consuming_touchend: testing...");
+      events = [];
+      const waitForTouchEnd = promiseEvent("touchend");
+      child.addEventListener("touchend", event => {
+        event.preventDefault();
+      }, {once: true});
+      synthesizeTouch(child, 5, 5);
+      await waitForTouchEnd;
+      is(
+        stringifyEvents(shiftEventsBefore(events)),
+        stringifyEvents([]),
+        `test_single_tap_with_consuming_touchstart() shouldn't cause mouse events after touchend`
+      )
+      is(
+        stringifyEvents(events),
+        stringifyEvents([
+          { type: "touchend", target: child },
+        ]),
+        `Single tap should not cause mouse events if touchend is consumed ${desc}`
+      );
+    })();
+
+    await (async function test_multi_touch() {
+      await promiseFlushingAPZGestureState();
+      events = [];
+      info("test_multi_touch: testing...");
+      const waitForTouchEnd = new Promise(resolve => {
+        let count = 0;
+        function onTouchEnd(event) {
+          if (++count == 2) {
+            removeEventListener("touchend", onTouchEnd, {capture: true});
+            requestAnimationFrame(() => requestAnimationFrame(resolve));
+          }
+        }
+        addEventListener("touchend", onTouchEnd, {capture: true});
+      });
+      synthesizeTouch(child, [5, 25], 5);
+      await waitForTouchEnd;
+      is(
+        stringifyEvents(shiftEventsBefore(events)),
+        stringifyEvents([]),
+        `test_single_tap_with_consuming_touchend() shouldn't cause mouse events after touchend`
+      )
+      is(
+        stringifyEvents(events),
+        stringifyEvents([
+          { type: "touchend", target: child },
+          { type: "touchend", target: child },
+        ]),
+        `Multiple touch should not cause mouse events ${desc}`
+      );
+    })();
+  }
+  SimpleTest.finish();
+});
+</script>
+</head>
+<body><div id="parent"><div id="child"></div></div></body>
+</html>
diff --git a/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html b/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html
index 3898584b0a..43d8081606 100644
--- a/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html
+++ b/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html
@@ -39,7 +39,7 @@ SimpleTest.waitForExplicitFinish();
 SimpleTest.waitForFocus(async function doTests() {
   let iframe = document.getElementById("iframe");
   let waitForCheckKeyPressEventModelEvent = new Promise(resolve => {
-    SpecialPowers.addSystemEventListener(iframe.contentDocument, "CheckKeyPressEventModel", resolve, {once: true});
+    SpecialPowers.wrap(iframe.contentDocument).addEventListener("CheckKeyPressEventModel", resolve, {mozSystemGroup: true, once: true});
   });
   iframe.contentDocument.body.setAttribute("contenteditable", "true");
   await waitForCheckKeyPressEventModelEvent;
diff --git a/dom/events/test/test_use_split_keypress_event_model_on_old_Office_Online_Server.html b/dom/events/test/test_use_split_keypress_event_model_on_old_Office_Online_Server.html
index 68f52be41d..02047fef90 100644
--- a/dom/events/test/test_use_split_keypress_event_model_on_old_Office_Online_Server.html
+++ b/dom/events/test/test_use_split_keypress_event_model_on_old_Office_Online_Server.html
@@ -23,7 +23,7 @@ function srcdocLoaded() {
    waitForCheckKeyPressEventModelEvent = new Promise(resolve => {
       dump(document.querySelector("iframe").contentDocument.location + "\n");
       var doc = document.querySelector("iframe").contentDocument;
-      SpecialPowers.addSystemEventListener(doc, "CheckKeyPressEventModel", resolve, {once: true});
+      SpecialPowers.wrap(doc).addEventListener("CheckKeyPressEventModel", resolve, {mozSystemGroup: true, once: true});
       doc.getElementById("WACViewPanel_EditingElement").contentEditable = "true";
    });
 }
-- 
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