Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-19 01:14:29 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-19 01:14:29 +0000
commit: fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 (patch)
tree: 4c1ccaf5486d4f2009f9a338a98a83e886e29c97 /widget
parent: Releasing progress-linux version 124.0.1-1~progress7.99u1. (diff)
download: firefox-fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8.tar.xz
firefox-fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8.zip
143 files changed, 4329 insertions, 1802 deletions
diff --git a/widget/EventMessageList.h b/widget/EventMessageList.h
index ae02d04676..f42c1e3b2c 100644
--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -209,6 +209,10 @@ NS_EVENT_MESSAGE(eLegacyDOMFocusOut)
 NS_EVENT_MESSAGE(ePageShow)
 NS_EVENT_MESSAGE(ePageHide)
 
+// Canvas events
+NS_EVENT_MESSAGE(eContextLost)
+NS_EVENT_MESSAGE(eContextRestored)
+
 // SVG events
 NS_EVENT_MESSAGE(eSVGLoad)
 NS_EVENT_MESSAGE(eSVGScroll)
diff --git a/widget/GfxInfoBase.cpp b/widget/GfxInfoBase.cpp
index 3e32ffbe15..251b46ce66 100644
--- a/widget/GfxInfoBase.cpp
+++ b/widget/GfxInfoBase.cpp
@@ -279,6 +279,12 @@ static const char* GetPrefNameForFeature(int32_t aFeature) {
     case nsIGfxInfo::FEATURE_WEBGL_USE_HARDWARE:
       name = BLOCKLIST_PREF_BRANCH "webgl-use-hardware";
       break;
+    case nsIGfxInfo::FEATURE_OVERLAY_VP_AUTO_HDR:
+      name = BLOCKLIST_PREF_BRANCH "overlay-vp-auto-hdr";
+      break;
+    case nsIGfxInfo::FEATURE_OVERLAY_VP_SUPER_RESOLUTION:
+      name = BLOCKLIST_PREF_BRANCH "overlay-vp-super-resolution";
+      break;
     default:
       MOZ_ASSERT_UNREACHABLE("Unexpected nsIGfxInfo feature?!");
       break;
@@ -555,6 +561,12 @@ static int32_t BlocklistFeatureToGfxFeature(const nsAString& aFeature) {
   if (aFeature.EqualsLiteral("ACCELERATED_CANVAS2D")) {
     return nsIGfxInfo::FEATURE_ACCELERATED_CANVAS2D;
   }
+  if (aFeature.EqualsLiteral("FEATURE_OVERLAY_VP_AUTO_HDR")) {
+    return nsIGfxInfo::FEATURE_OVERLAY_VP_AUTO_HDR;
+  }
+  if (aFeature.EqualsLiteral("FEATURE_OVERLAY_VP_SUPER_RESOLUTION")) {
+    return nsIGfxInfo::FEATURE_OVERLAY_VP_SUPER_RESOLUTION;
+  }
   if (aFeature.EqualsLiteral("ALL")) {
     return GfxDriverInfo::allFeatures;
   }
@@ -1276,8 +1288,7 @@ bool GfxInfoBase::DoesDriverVendorMatch(const nsAString& aBlocklistVendor,
 }
 
 bool GfxInfoBase::IsFeatureAllowlisted(int32_t aFeature) const {
-  return aFeature == nsIGfxInfo::FEATURE_VIDEO_OVERLAY ||
-         aFeature == nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY;
+  return aFeature == nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY;
 }
 
 nsresult GfxInfoBase::GetFeatureStatusImpl(
@@ -1925,7 +1936,7 @@ using Device = nsIGfxInfo::FontVisibilityDeviceDetermination;
 static StaticAutoPtr<std::pair<Device, nsString>> ret;
 
 std::pair<Device, nsString>* GfxInfoBase::GetFontVisibilityDeterminationPair() {
-  if(!ret) {
+  if (!ret) {
     ret = new std::pair<Device, nsString>();
     ret->first = Device::Unassigned;
     ret->second = u""_ns;
@@ -2150,6 +2161,18 @@ GfxInfoBase::GetUsingGPUProcess(bool* aOutValue) {
   return NS_OK;
 }
 
+NS_IMETHODIMP
+GfxInfoBase::GetUsingRemoteCanvas(bool* aOutValue) {
+  *aOutValue = gfx::gfxVars::RemoteCanvasEnabled();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GfxInfoBase::GetUsingAcceleratedCanvas(bool* aOutValue) {
+  *aOutValue = gfx::gfxVars::UseAcceleratedCanvas2D();
+  return NS_OK;
+}
+
 NS_IMETHODIMP_(int32_t)
 GfxInfoBase::GetMaxRefreshRate(bool* aMixed) {
   if (aMixed) {
diff --git a/widget/GfxInfoBase.h b/widget/GfxInfoBase.h
index 4d4b1a2def..c2bab66400 100644
--- a/widget/GfxInfoBase.h
+++ b/widget/GfxInfoBase.h
@@ -73,6 +73,8 @@ class GfxInfoBase : public nsIGfxInfo,
   NS_IMETHOD GetAzureCanvasBackend(nsAString& aBackend) override;
   NS_IMETHOD GetAzureContentBackend(nsAString& aBackend) override;
   NS_IMETHOD GetUsingGPUProcess(bool* aOutValue) override;
+  NS_IMETHOD GetUsingRemoteCanvas(bool* aOutValue) override;
+  NS_IMETHOD GetUsingAcceleratedCanvas(bool* aOutValue) override;
   NS_IMETHOD GetIsHeadless(bool* aIsHeadless) override;
   NS_IMETHOD GetTargetFrameRate(uint32_t* aTargetFrameRate) override;
   NS_IMETHOD GetCodecSupportInfo(nsACString& aCodecSupportInfo) override;
diff --git a/widget/IMEData.h b/widget/IMEData.h
index 7fb1241333..1ea33e18b9 100644
--- a/widget/IMEData.h
+++ b/widget/IMEData.h
@@ -451,18 +451,20 @@ struct InputContext final {
 
   bool IsInputAttributeChanged(const InputContext& aOldContext) const {
     return mIMEState.mEnabled != aOldContext.mIMEState.mEnabled ||
-#if defined(ANDROID) || defined(MOZ_WIDGET_GTK) || defined(XP_WIN)
+#if defined(ANDROID) || defined(MOZ_WIDGET_GTK) || defined(XP_WIN) || \
+    defined(XP_IOS)
            // input type and inputmode are supported by Windows IME API, GTK
-           // IME API and Android IME API
+           // IME API, Android IME API and iOS API.
            mHTMLInputType != aOldContext.mHTMLInputType ||
            mHTMLInputMode != aOldContext.mHTMLInputMode ||
 #endif
-#if defined(ANDROID) || defined(MOZ_WIDGET_GTK)
-           // autocapitalize is supported by Android IME API and GTK IME API
+#if defined(ANDROID) || defined(MOZ_WIDGET_GTK) || defined(XP_IOS)
+           // autocapitalize is supported by Android IME API, GTK IME API, and
+           // iOS API
            mAutocapitalize != aOldContext.mAutocapitalize ||
 #endif
-#if defined(ANDROID)
-           // enterkeyhint is only supported by Android IME API.
+#if defined(ANDROID) || defined(XP_IOS)
+           // enterkeyhint is only supported by Android IME API and iOS API.
            mActionHint != aOldContext.mActionHint ||
 #endif
            false;
diff --git a/widget/IconLoader.cpp b/widget/IconLoader.cpp
index 5c0488e3e2..41d2a29bc7 100644
--- a/widget/IconLoader.cpp
+++ b/widget/IconLoader.cpp
@@ -9,6 +9,7 @@
 #include "imgLoader.h"
 #include "imgRequestProxy.h"
 #include "mozilla/dom/Document.h"
+#include "mozilla/dom/FetchPriority.h"
 #include "nsContentUtils.h"
 #include "nsIContent.h"
 #include "nsIContentPolicy.h"
@@ -63,7 +64,7 @@ nsresult IconLoader::LoadIcon(nsIURI* aIconURI, nsINode* aNode,
         nullptr, nsIRequest::LOAD_NORMAL, nullptr,
         nsIContentPolicy::TYPE_INTERNAL_IMAGE, u""_ns,
         /* aUseUrgentStartForChannel */ false, /* aLinkPreload */ false, 0,
-        getter_AddRefs(mIconRequest));
+        dom::FetchPriority::Auto, getter_AddRefs(mIconRequest));
   } else {
     // TODO: nsIContentPolicy::TYPE_INTERNAL_IMAGE may not be the correct
     // policy. See bug 1691868 for more details.
@@ -72,7 +73,8 @@ nsresult IconLoader::LoadIcon(nsIURI* aIconURI, nsINode* aNode,
         aNode, document, nsIRequest::LOAD_NORMAL, nullptr,
         nsIContentPolicy::TYPE_INTERNAL_IMAGE, u""_ns,
         /* aUseUrgentStartForChannel */ false,
-        /* aLinkPreload */ false, 0, getter_AddRefs(mIconRequest));
+        /* aLinkPreload */ false, 0, dom::FetchPriority::Auto,
+        getter_AddRefs(mIconRequest));
   }
   if (NS_FAILED(rv)) {
     return rv;
diff --git a/widget/InitData.h b/widget/InitData.h
index 1498feed9a..aed5e0a551 100644
--- a/widget/InitData.h
+++ b/widget/InitData.h
@@ -37,11 +37,6 @@ enum class PopupLevel : uint8_t {
   // The popup appears just above its parent and maintains its position
   // relative to the parent.
   Parent,
-  // The popup is a floating popup used for tool palettes. A parent window must
-  // be specified, but a platform implementation need not use this. On Windows,
-  // floating is generally equivalent to parent. On Mac, floating puts the
-  // popup at toplevel, but it will hide when the application is deactivated.
-  Floating,
   // The popup appears on top of other windows, including those of other
   // applications.
   Top,
diff --git a/widget/LookAndFeel.h b/widget/LookAndFeel.h
index 2ab61df304..0cab187410 100644
--- a/widget/LookAndFeel.h
+++ b/widget/LookAndFeel.h
@@ -163,10 +163,6 @@ class LookAndFeel {
      * 1: scrollbar button repeats to scroll even if cursor is outside of it.
      */
     ScrollbarButtonAutoRepeatBehavior,
-    /**
-     * Delay before showing a tooltip.
-     */
-    TooltipDelay,
     /*
      * A Boolean value to determine whether swipe animations should be used.
      */
@@ -293,6 +289,9 @@ class LookAndFeel {
     /** GTK titlebar radius */
     TitlebarRadius,
 
+    /** GTK button-to-button spacing in the inline axis */
+    TitlebarButtonSpacing,
+
     /**
      * Corresponding to dynamic-range.
      * https://drafts.csswg.org/mediaqueries-5/#dynamic-range
diff --git a/widget/Theme.cpp b/widget/Theme.cpp
index 35c53240e5..1fcd3d4bc3 100644
--- a/widget/Theme.cpp
+++ b/widget/Theme.cpp
@@ -1562,7 +1562,7 @@ UniquePtr<ScrollbarDrawing> Theme::ScrollbarStyle() {
     return MakeUnique<ScrollbarDrawingWin11>();
   }
   return MakeUnique<ScrollbarDrawingWin>();
-#elif MOZ_WIDGET_COCOA
+#elif defined(MOZ_WIDGET_COCOA) || defined(MOZ_WIDGET_UIKIT)
   return MakeUnique<ScrollbarDrawingCocoa>();
 #elif MOZ_WIDGET_GTK
   return MakeUnique<ScrollbarDrawingGTK>();
diff --git a/widget/ThemeCocoa.cpp b/widget/ThemeCocoa.cpp
index 733c215991..a41d41409b 100644
--- a/widget/ThemeCocoa.cpp
+++ b/widget/ThemeCocoa.cpp
@@ -4,27 +4,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "ThemeCocoa.h"
-
-#include "cocoa/MacThemeGeometryType.h"
 #include "gfxPlatform.h"
-#include "mozilla/ClearOnShutdown.h"
-#include "mozilla/gfx/Helpers.h"
 #include "mozilla/LookAndFeel.h"
 #include "mozilla/ServoStyleConsts.h"
 
 namespace mozilla::widget {
 
-LayoutDeviceIntSize ThemeCocoa::GetMinimumWidgetSize(
-    nsPresContext* aPresContext, nsIFrame* aFrame,
-    StyleAppearance aAppearance) {
-  if (aAppearance == StyleAppearance::MozMenulistArrowButton) {
-    auto size =
-        GetScrollbarSize(aPresContext, StyleScrollbarWidth::Auto, Overlay::No);
-    return {size, size};
-  }
-  return Theme::GetMinimumWidgetSize(aPresContext, aFrame, aAppearance);
-}
-
 NS_IMETHODIMP
 ThemeCocoa::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
                                  StyleAppearance aAppearance,
diff --git a/widget/ThemeCocoa.h b/widget/ThemeCocoa.h
index f846766f37..d5d84ee5f0 100644
--- a/widget/ThemeCocoa.h
+++ b/widget/ThemeCocoa.h
@@ -9,8 +9,6 @@
 
 #include "Theme.h"
 
-#include "ScrollbarDrawingCocoa.h"
-
 namespace mozilla::widget {
 
 class ThemeCocoa : public Theme {
@@ -18,10 +16,6 @@ class ThemeCocoa : public Theme {
   explicit ThemeCocoa(UniquePtr<ScrollbarDrawing>&& aScrollbarDrawing)
       : Theme(std::move(aScrollbarDrawing)) {}
 
-  LayoutDeviceIntSize GetMinimumWidgetSize(
-      nsPresContext* aPresContext, nsIFrame* aFrame,
-      StyleAppearance aAppearance) override;
-
   NS_IMETHOD DrawWidgetBackground(gfxContext* aContext, nsIFrame*,
                                   StyleAppearance, const nsRect& aRect,
                                   const nsRect& aDirtyRect,
diff --git a/widget/android/EventDispatcher.cpp b/widget/android/EventDispatcher.cpp
index ab876de136..6e414c11ce 100644
--- a/widget/android/EventDispatcher.cpp
+++ b/widget/android/EventDispatcher.cpp
@@ -129,9 +129,9 @@ nsresult UnboxBundle(JSContext* aCx, const jni::Object::LocalRef& aData,
     nsresult rv = UnboxValue(aCx, values->GetElement(i), &value);
     if (rv == NS_ERROR_INVALID_ARG && !JS_IsExceptionPending(aCx)) {
       JS_ReportErrorUTF8(
-          aCx, u8"Invalid event data property %s",
-          NS_ConvertUTF16toUTF8(
-              nsString(reinterpret_cast<const char16_t*>(keyChars), keyLen))
+          aCx, "Invalid event data property %s",
+          NS_ConvertUTF16toUTF8(reinterpret_cast<const char16_t*>(keyChars),
+                                keyLen)
               .get());
     }
     NS_ENSURE_SUCCESS(rv, rv);
diff --git a/widget/android/GfxInfo.cpp b/widget/android/GfxInfo.cpp
index 0e78b187bf..6e6d3bf47b 100644
--- a/widget/android/GfxInfo.cpp
+++ b/widget/android/GfxInfo.cpp
@@ -350,11 +350,11 @@ GfxInfo::GetDrmRenderDevice(nsACString& aDrmRenderDevice) {
 }
 
 void GfxInfo::AddCrashReportAnnotations() {
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterVendorID,
-                                     mGLStrings->Vendor());
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterDeviceID,
-                                     mGLStrings->Renderer());
-  CrashReporter::AnnotateCrashReport(
+  CrashReporter::RecordAnnotationNSCString(
+      CrashReporter::Annotation::AdapterVendorID, mGLStrings->Vendor());
+  CrashReporter::RecordAnnotationNSCString(
+      CrashReporter::Annotation::AdapterDeviceID, mGLStrings->Renderer());
+  CrashReporter::RecordAnnotationNSCString(
       CrashReporter::Annotation::AdapterDriverVersion, mGLStrings->Version());
 }
 
diff --git a/widget/android/jni/Utils.cpp b/widget/android/jni/Utils.cpp
index 08164e4950..8d3800fd03 100644
--- a/widget/android/jni/Utils.cpp
+++ b/widget/android/jni/Utils.cpp
@@ -221,7 +221,7 @@ bool HandleUncaughtException(JNIEnv* aEnv) {
 bool ReportException(JNIEnv* aEnv, jthrowable aExc, jstring aStack) {
   bool result = true;
 
-  result &= NS_SUCCEEDED(CrashReporter::AnnotateCrashReport(
+  result &= NS_SUCCEEDED(CrashReporter::RecordAnnotationNSCString(
       CrashReporter::Annotation::JavaStackTrace,
       String::Ref::From(aStack)->ToCString()));
 
diff --git a/widget/android/nsLookAndFeel.cpp b/widget/android/nsLookAndFeel.cpp
index 02919e0dbf..6d9f8c634f 100644
--- a/widget/android/nsLookAndFeel.cpp
+++ b/widget/android/nsLookAndFeel.cpp
@@ -312,10 +312,6 @@ nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
       aResult = 200;
       break;
 
-    case IntID::TooltipDelay:
-      aResult = 500;
-      break;
-
     case IntID::MenusCanOverlapOSBar:
       // we want XUL popups to be able to overlap the task bar.
       aResult = 1;
diff --git a/widget/cocoa/CFTypeRefPtr.h b/widget/cocoa/CFTypeRefPtr.h
deleted file mode 100644
index 185355777e..0000000000
--- a/widget/cocoa/CFTypeRefPtr.h
+++ /dev/null
@@ -1,194 +0,0 @@
-/* -*- 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 CFTypeRefPtr_h
-#define CFTypeRefPtr_h
-
-#include "mozilla/Assertions.h"
-#include "mozilla/Attributes.h"
-#include "mozilla/DbgMacro.h"
-#include "mozilla/HashFunctions.h"
-
-// A smart pointer for CoreFoundation classes which does reference counting.
-//
-// Manual reference counting:
-//
-// UInt32 someNumber = 10;
-// CFNumberRef numberObject =
-//     CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &someNumber);
-// // do something with numberObject
-// CFRelease(numberObject);
-//
-// Automatic reference counting using CFTypeRefPtr:
-//
-// UInt32 someNumber = 10;
-// auto numberObject =
-//      CFTypeRefPtr<CFNumberRef>::WrapUnderCreateRule(
-//        CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &someNumber));
-// // do something with numberObject
-// // no CFRelease
-
-template <class PtrT>
-class CFTypeRefPtr {
- private:
-  void assign_with_CFRetain(PtrT aRawPtr) {
-    CFRetain(aRawPtr);
-    assign_assuming_CFRetain(aRawPtr);
-  }
-
-  void assign_assuming_CFRetain(PtrT aNewPtr) {
-    PtrT oldPtr = mRawPtr;
-    mRawPtr = aNewPtr;
-    if (oldPtr) {
-      CFRelease(oldPtr);
-    }
-  }
-
- private:
-  PtrT mRawPtr;
-
- public:
-  ~CFTypeRefPtr() {
-    if (mRawPtr) {
-      CFRelease(mRawPtr);
-    }
-  }
-
-  // Constructors
-
-  CFTypeRefPtr() : mRawPtr(nullptr) {}
-
-  CFTypeRefPtr(const CFTypeRefPtr<PtrT>& aSmartPtr)
-      : mRawPtr(aSmartPtr.mRawPtr) {
-    if (mRawPtr) {
-      CFRetain(mRawPtr);
-    }
-  }
-
-  CFTypeRefPtr(CFTypeRefPtr<PtrT>&& aRefPtr) : mRawPtr(aRefPtr.mRawPtr) {
-    aRefPtr.mRawPtr = nullptr;
-  }
-
-  MOZ_IMPLICIT CFTypeRefPtr(decltype(nullptr)) : mRawPtr(nullptr) {}
-
-  // There is no constructor from a raw pointer value.
-  // Use one of the static WrapUnder*Rule methods below instead.
-
-  static CFTypeRefPtr<PtrT> WrapUnderCreateRule(PtrT aRawPtr) {
-    CFTypeRefPtr<PtrT> ptr;
-    ptr.AssignUnderCreateRule(aRawPtr);
-    return ptr;
-  }
-
-  static CFTypeRefPtr<PtrT> WrapUnderGetRule(PtrT aRawPtr) {
-    CFTypeRefPtr<PtrT> ptr;
-    ptr.AssignUnderGetRule(aRawPtr);
-    return ptr;
-  }
-
-  // Assignment operators
-
-  CFTypeRefPtr<PtrT>& operator=(decltype(nullptr)) {
-    assign_assuming_CFRetain(nullptr);
-    return *this;
-  }
-
-  CFTypeRefPtr<PtrT>& operator=(const CFTypeRefPtr<PtrT>& aRhs) {
-    assign_with_CFRetain(aRhs.mRawPtr);
-    return *this;
-  }
-
-  CFTypeRefPtr<PtrT>& operator=(CFTypeRefPtr<PtrT>&& aRefPtr) {
-    assign_assuming_CFRetain(aRefPtr.mRawPtr);
-    aRefPtr.mRawPtr = nullptr;
-    return *this;
-  }
-
-  // There is no operator= for a raw pointer value.
-  // Use one of the AssignUnder*Rule methods below instead.
-
-  CFTypeRefPtr<PtrT>& AssignUnderCreateRule(PtrT aRawPtr) {
-    // Freshly-created objects come with a retain count of 1.
-    assign_assuming_CFRetain(aRawPtr);
-    return *this;
-  }
-
-  CFTypeRefPtr<PtrT>& AssignUnderGetRule(PtrT aRawPtr) {
-    assign_with_CFRetain(aRawPtr);
-    return *this;
-  }
-
-  // Other pointer operators
-
-  // This is the only way to get the raw pointer out of the smart pointer.
-  // There is no implicit conversion to a raw pointer.
-  PtrT get() const { return mRawPtr; }
-
-  // Don't allow implicit conversion of temporary CFTypeRefPtr to raw pointer,
-  // because the refcount might be one and the pointer will immediately become
-  // invalid.
-  operator PtrT() const&& = delete;
-  // Also don't allow implicit conversion of non-temporary CFTypeRefPtr.
-  operator PtrT() const& = delete;
-
-  // These let you null-check a pointer without calling get().
-  explicit operator bool() const { return !!mRawPtr; }
-};
-
-template <class PtrT>
-inline bool operator==(const CFTypeRefPtr<PtrT>& aLhs,
-                       const CFTypeRefPtr<PtrT>& aRhs) {
-  return aLhs.get() == aRhs.get();
-}
-
-template <class PtrT>
-inline bool operator!=(const CFTypeRefPtr<PtrT>& aLhs,
-                       const CFTypeRefPtr<PtrT>& aRhs) {
-  return !(aLhs == aRhs);
-}
-
-// Comparing an |CFTypeRefPtr| to |nullptr|
-
-template <class PtrT>
-inline bool operator==(const CFTypeRefPtr<PtrT>& aLhs, decltype(nullptr)) {
-  return aLhs.get() == nullptr;
-}
-
-template <class PtrT>
-inline bool operator==(decltype(nullptr), const CFTypeRefPtr<PtrT>& aRhs) {
-  return nullptr == aRhs.get();
-}
-
-template <class PtrT>
-inline bool operator!=(const CFTypeRefPtr<PtrT>& aLhs, decltype(nullptr)) {
-  return aLhs.get() != nullptr;
-}
-
-template <class PtrT>
-inline bool operator!=(decltype(nullptr), const CFTypeRefPtr<PtrT>& aRhs) {
-  return nullptr != aRhs.get();
-}
-
-// MOZ_DBG support
-
-template <class PtrT>
-std::ostream& operator<<(std::ostream& aOut, const CFTypeRefPtr<PtrT>& aObj) {
-  return mozilla::DebugValue(aOut, aObj.get());
-}
-
-// std::hash support (e.g. for unordered_map)
-namespace std {
-template <class PtrT>
-struct hash<CFTypeRefPtr<PtrT>> {
-  typedef CFTypeRefPtr<PtrT> argument_type;
-  typedef std::size_t result_type;
-  result_type operator()(argument_type const& aPtr) const {
-    return mozilla::HashGeneric(reinterpret_cast<uintptr_t>(aPtr.get()));
-  }
-};
-}  // namespace std
-
-#endif /* CFTypeRefPtr_h */
diff --git a/widget/cocoa/GfxInfo.mm b/widget/cocoa/GfxInfo.mm
index 1476cc27db..f4477cef4a 100644
--- a/widget/cocoa/GfxInfo.mm
+++ b/widget/cocoa/GfxInfo.mm
@@ -419,21 +419,17 @@ GfxInfo::GetIsGPU2Active(bool* aIsGPU2Active) { return NS_ERROR_FAILURE; }
 
 void GfxInfo::AddCrashReportAnnotations() {
   nsString deviceID, vendorID, driverVersion;
-  nsAutoCString narrowDeviceID, narrowVendorID, narrowDriverVersion;
 
   GetAdapterDeviceID(deviceID);
-  CopyUTF16toUTF8(deviceID, narrowDeviceID);
   GetAdapterVendorID(vendorID);
-  CopyUTF16toUTF8(vendorID, narrowVendorID);
   GetAdapterDriverVersion(driverVersion);
-  CopyUTF16toUTF8(driverVersion, narrowDriverVersion);
-
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterVendorID,
-                                     narrowVendorID);
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterDeviceID,
-                                     narrowDeviceID);
-  CrashReporter::AnnotateCrashReport(
-      CrashReporter::Annotation::AdapterDriverVersion, narrowDriverVersion);
+
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterVendorID, vendorID);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterDeviceID, deviceID);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterDriverVersion, driverVersion);
 }
 
 // We don't support checking driver versions on Mac.
diff --git a/widget/cocoa/MOZIconHelper.mm b/widget/cocoa/MOZIconHelper.mm
index e15407b797..f9c8f02406 100644
--- a/widget/cocoa/MOZIconHelper.mm
+++ b/widget/cocoa/MOZIconHelper.mm
@@ -32,11 +32,11 @@
   if (aScaleFactor != 0.0f) {
     rv = nsCocoaUtils::CreateNSImageFromImageContainer(
         aImage, imgIContainer::FRAME_CURRENT, aPresContext, aComputedStyle,
-        &retainedImage, aScaleFactor, &isEntirelyBlack);
+        aSize, &retainedImage, aScaleFactor, &isEntirelyBlack);
   } else {
     rv = nsCocoaUtils::CreateDualRepresentationNSImageFromImageContainer(
         aImage, imgIContainer::FRAME_CURRENT, aPresContext, aComputedStyle,
-        &retainedImage, &isEntirelyBlack);
+        aSize, &retainedImage, &isEntirelyBlack);
   }
 
   NSImage* image = [retainedImage autorelease];
@@ -45,10 +45,6 @@
     return nil;
   }
 
-  int32_t origWidth = 0, origHeight = 0;
-  aImage->GetWidth(&origWidth);
-  aImage->GetHeight(&origHeight);
-
   // If all the color channels in the image are black, treat the image as a
   // template. This will cause macOS to use the image's alpha channel as a mask
   // and it will fill it with a color that looks good in the context that it's
diff --git a/widget/cocoa/OSXNotificationCenter.mm b/widget/cocoa/OSXNotificationCenter.mm
index 07cb026f1f..f7d507a947 100644
--- a/widget/cocoa/OSXNotificationCenter.mm
+++ b/widget/cocoa/OSXNotificationCenter.mm
@@ -544,9 +544,11 @@ OSXNotificationCenter::OnImageReady(nsISupports* aUserData,
 
   NSImage* cocoaImage = nil;
   // TODO: Pass pres context / ComputedStyle here to support context paint
-  // properties
+  // properties.
+  // TODO: Do we have a reasonable size to pass around here?
   nsCocoaUtils::CreateDualRepresentationNSImageFromImageContainer(
-      image, imgIContainer::FRAME_FIRST, nullptr, nullptr, &cocoaImage);
+      image, imgIContainer::FRAME_FIRST, nullptr, nullptr, NSMakeSize(0, 0),
+      &cocoaImage);
   (osxni->mPendingNotification).contentImage = cocoaImage;
   [cocoaImage release];
   ShowPendingNotification(osxni);
diff --git a/widget/cocoa/TextRecognition.mm b/widget/cocoa/TextRecognition.mm
index c365f51982..31a170466a 100644
--- a/widget/cocoa/TextRecognition.mm
+++ b/widget/cocoa/TextRecognition.mm
@@ -70,8 +70,8 @@ auto TextRecognition::DoFindText(gfx::DataSourceSurface& aSurface,
 
                     // https://developer.apple.com/documentation/vision/vnrecognizedtext?language=objc
                     auto& quad = *pResult->quads().AppendElement();
-                    CopyCocoaStringToXPCOMString(recognizedText.string,
-                                                 quad.string());
+                    CopyNSStringToXPCOMString(recognizedText.string,
+                                              quad.string());
                     quad.confidence() = recognizedText.confidence;
 
                     auto ToImagePoint = [](CGPoint aPoint) -> ImagePoint {
diff --git a/widget/cocoa/moz.build b/widget/cocoa/moz.build
index ebee9439e0..ddb402e2cc 100644
--- a/widget/cocoa/moz.build
+++ b/widget/cocoa/moz.build
@@ -18,7 +18,6 @@ XPIDL_SOURCES += [
 XPIDL_MODULE = "widget_cocoa"
 
 EXPORTS += [
-    "CFTypeRefPtr.h",
     "DesktopBackgroundImage.h",
     "MediaHardwareKeysEventSourceMac.h",
     "MediaHardwareKeysEventSourceMacMediaCenter.h",
diff --git a/widget/cocoa/nsCocoaUtils.h b/widget/cocoa/nsCocoaUtils.h
index 9e3b76a920..9b36c1192d 100644
--- a/widget/cocoa/nsCocoaUtils.h
+++ b/widget/cocoa/nsCocoaUtils.h
@@ -18,6 +18,7 @@
 #include "nsObjCExceptions.h"
 
 #include "mozilla/EventForwards.h"
+#include "mozilla/MacStringHelpers.h"
 #include "mozilla/StaticMutex.h"
 #include "mozilla/StaticPtr.h"
 #include "nsIWidget.h"
@@ -298,8 +299,9 @@ class nsCocoaUtils {
   static nsresult CreateNSImageFromImageContainer(
       imgIContainer* aImage, uint32_t aWhichFrame,
       const nsPresContext* aPresContext,
-      const mozilla::ComputedStyle* aComputedStyle, NSImage** aResult,
-      CGFloat scaleFactor, bool* aIsEntirelyBlack = nullptr);
+      const mozilla::ComputedStyle* aComputedStyle,
+      const NSSize& aPreferredSize, NSImage** aResult, CGFloat scaleFactor,
+      bool* aIsEntirelyBlack = nullptr);
 
   /** Creates a Cocoa <code>NSImage</code> from a frame of an
      <code>imgIContainer</code>. The new <code>NSImage</code> will have both a
@@ -317,18 +319,23 @@ class nsCocoaUtils {
   static nsresult CreateDualRepresentationNSImageFromImageContainer(
       imgIContainer* aImage, uint32_t aWhichFrame,
       const nsPresContext* aPresContext,
-      const mozilla::ComputedStyle* aComputedStyle, NSImage** aResult,
+      const mozilla::ComputedStyle* aComputedStyle,
+      const NSSize& aPreferredSize, NSImage** aResult,
       bool* aIsEntirelyBlack = nullptr);
 
   /**
    * Returns nsAString for aSrc.
    */
-  static void GetStringForNSString(const NSString* aSrc, nsAString& aDist);
+  static void GetStringForNSString(const NSString* aSrc, nsAString& aDist) {
+    mozilla::CopyNSStringToXPCOMString(aSrc, aDist);
+  }
 
   /**
    * Makes NSString instance for aString.
    */
-  static NSString* ToNSString(const nsAString& aString);
+  static NSString* ToNSString(const nsAString& aString) {
+    return mozilla::XPCOMStringToNSString(aString);
+  }
 
   /**
    * Returns an NSURL instance for the provided string.
@@ -338,7 +345,9 @@ class nsCocoaUtils {
   /**
    * Makes NSString instance for aCString.
    */
-  static NSString* ToNSString(const nsACString& aCString);
+  static NSString* ToNSString(const nsACString& aCString) {
+    return mozilla::XPCOMStringToNSString(aCString);
+  }
 
   /**
    * Returns NSRect for aGeckoRect.
diff --git a/widget/cocoa/nsCocoaUtils.mm b/widget/cocoa/nsCocoaUtils.mm
index f3a7604762..769eb05a85 100644
--- a/widget/cocoa/nsCocoaUtils.mm
+++ b/widget/cocoa/nsCocoaUtils.mm
@@ -515,11 +515,27 @@ nsresult nsCocoaUtils::CreateNSImageFromCGImage(CGImageRef aInputImage,
 nsresult nsCocoaUtils::CreateNSImageFromImageContainer(
     imgIContainer* aImage, uint32_t aWhichFrame,
     const nsPresContext* aPresContext, const ComputedStyle* aComputedStyle,
-    NSImage** aResult, CGFloat scaleFactor, bool* aIsEntirelyBlack) {
+    const NSSize& aPreferredSize, NSImage** aResult, CGFloat scaleFactor,
+    bool* aIsEntirelyBlack) {
   RefPtr<SourceSurface> surface;
-  int32_t width = 0, height = 0;
-  aImage->GetWidth(&width);
-  aImage->GetHeight(&height);
+  int32_t width = 0;
+  int32_t height = 0;
+  {
+    const bool gotWidth = NS_SUCCEEDED(aImage->GetWidth(&width));
+    const bool gotHeight = NS_SUCCEEDED(aImage->GetHeight(&height));
+    if (auto ratio = aImage->GetIntrinsicRatio()) {
+      if (gotWidth != gotHeight) {
+        if (gotWidth) {
+          height = ratio->Inverted().ApplyTo(width);
+        } else {
+          width = ratio->ApplyTo(height);
+        }
+      } else if (!gotWidth) {
+        height = std::ceil(aPreferredSize.height);
+        width = ratio->ApplyTo(height);
+      }
+    }
+  }
 
   // Render a vector image at the correct resolution on a retina display
   if (aImage->GetType() == imgIContainer::TYPE_VECTOR) {
@@ -582,31 +598,28 @@ nsresult nsCocoaUtils::CreateNSImageFromImageContainer(
 nsresult nsCocoaUtils::CreateDualRepresentationNSImageFromImageContainer(
     imgIContainer* aImage, uint32_t aWhichFrame,
     const nsPresContext* aPresContext, const ComputedStyle* aComputedStyle,
-    NSImage** aResult, bool* aIsEntirelyBlack) {
-  int32_t width = 0, height = 0;
-  aImage->GetWidth(&width);
-  aImage->GetHeight(&height);
-  NSSize size = NSMakeSize(width, height);
-  *aResult = [[NSImage alloc] init];
-  [*aResult setSize:size];
-
+    const NSSize& aPreferredSize, NSImage** aResult, bool* aIsEntirelyBlack) {
   NSImage* newRepresentation = nil;
   nsresult rv = CreateNSImageFromImageContainer(
-      aImage, aWhichFrame, aPresContext, aComputedStyle, &newRepresentation,
-      1.0f, aIsEntirelyBlack);
+      aImage, aWhichFrame, aPresContext, aComputedStyle, aPreferredSize,
+      &newRepresentation, 1.0f, aIsEntirelyBlack);
   if (NS_FAILED(rv) || !newRepresentation) {
     return NS_ERROR_FAILURE;
   }
 
+  NSSize size = newRepresentation.size;
+  *aResult = [[NSImage alloc] init];
+  [*aResult setSize:size];
+
   [[[newRepresentation representations] objectAtIndex:0] setSize:size];
   [*aResult
       addRepresentation:[[newRepresentation representations] objectAtIndex:0]];
   [newRepresentation release];
   newRepresentation = nil;
 
-  rv = CreateNSImageFromImageContainer(aImage, aWhichFrame, aPresContext,
-                                       aComputedStyle, &newRepresentation, 2.0f,
-                                       aIsEntirelyBlack);
+  rv = CreateNSImageFromImageContainer(
+      aImage, aWhichFrame, aPresContext, aComputedStyle, aPreferredSize,
+      &newRepresentation, 2.0f, aIsEntirelyBlack);
   if (NS_FAILED(rv) || !newRepresentation) {
     return NS_ERROR_FAILURE;
   }
@@ -619,43 +632,6 @@ nsresult nsCocoaUtils::CreateDualRepresentationNSImageFromImageContainer(
 }
 
 // static
-void nsCocoaUtils::GetStringForNSString(const NSString* aSrc,
-                                        nsAString& aDist) {
-  NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
-
-  if (!aSrc) {
-    aDist.Truncate();
-    return;
-  }
-
-  aDist.SetLength([aSrc length]);
-  [aSrc getCharacters:reinterpret_cast<unichar*>(aDist.BeginWriting())
-                range:NSMakeRange(0, [aSrc length])];
-
-  NS_OBJC_END_TRY_IGNORE_BLOCK;
-}
-
-// static
-NSString* nsCocoaUtils::ToNSString(const nsAString& aString) {
-  if (aString.IsEmpty()) {
-    return [NSString string];
-  }
-  return [NSString stringWithCharacters:reinterpret_cast<const unichar*>(
-                                            aString.BeginReading())
-                                 length:aString.Length()];
-}
-
-// static
-NSString* nsCocoaUtils::ToNSString(const nsACString& aCString) {
-  if (aCString.IsEmpty()) {
-    return [NSString string];
-  }
-  return [[[NSString alloc] initWithBytes:aCString.BeginReading()
-                                   length:aCString.Length()
-                                 encoding:NSUTF8StringEncoding] autorelease];
-}
-
-// static
 NSURL* nsCocoaUtils::ToNSURL(const nsAString& aURLString) {
   nsAutoCString encodedURLString;
   nsresult rv = NS_GetSpecWithNSURLEncoding(encodedURLString,
diff --git a/widget/cocoa/nsCocoaWindow.h b/widget/cocoa/nsCocoaWindow.h
index c2e595677f..621c32eb44 100644
--- a/widget/cocoa/nsCocoaWindow.h
+++ b/widget/cocoa/nsCocoaWindow.h
@@ -492,6 +492,7 @@ class nsCocoaWindow final : public nsBaseWidget, public nsPIWidgetCocoa {
   bool mWindowTransformIsIdentity;
   bool mAlwaysOnTop;
   bool mAspectRatioLocked;
+  bool mIsAlert = false;  // True if this is an non-native alert window.
 
   int32_t mNumModalDescendents;
   InputContext mInputContext;
diff --git a/widget/cocoa/nsCocoaWindow.mm b/widget/cocoa/nsCocoaWindow.mm
index e5abaa5a87..4b135e7565 100644
--- a/widget/cocoa/nsCocoaWindow.mm
+++ b/widget/cocoa/nsCocoaWindow.mm
@@ -187,7 +187,7 @@ void nsCocoaWindow::DestroyNativeWindow() {
   [mWindow releaseJSObjects];
   // We want to unhook the delegate here because we don't want events
   // sent to it after this object has been destroyed.
-  [mWindow setDelegate:nil];
+  mWindow.delegate = nil;
   [mWindow close];
   mWindow = nil;
   [mDelegate autorelease];
@@ -260,7 +260,7 @@ DesktopToLayoutDeviceScale ParentBackingScaleFactor(nsIWidget* aParent,
   }
   NSWindow* parentWindow = [aParentView window];
   if (parentWindow) {
-    return DesktopToLayoutDeviceScale([parentWindow backingScaleFactor]);
+    return DesktopToLayoutDeviceScale(parentWindow.backingScaleFactor);
   }
   return DesktopToLayoutDeviceScale(1.0);
 }
@@ -322,6 +322,7 @@ nsresult nsCocoaWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
   mParent = aParent;
   mAncestorLink = aParent;
   mAlwaysOnTop = aInitData->mAlwaysOnTop;
+  mIsAlert = aInitData->mIsAlert;
 
   // If we have a parent widget, the new widget will be offset from the
   // parent widget by aRect.{x,y}. Otherwise, we'll use aRect for the
@@ -477,29 +478,31 @@ nsresult nsCocoaWindow::CreateNativeWindow(const NSRect& aRect,
     contentRect = aRect;
     contentRect.origin.y -= (newWindowFrame.size.height - aRect.size.height);
 
-    if (mWindowType != WindowType::Popup)
-      contentRect.origin.y -= [[NSApp mainMenu] menuBarHeight];
+    if (mWindowType != WindowType::Popup) {
+      contentRect.origin.y -= NSApp.mainMenu.menuBarHeight;
+    }
   }
 
   // NSLog(@"Top-level window being created at Cocoa rect: %f, %f, %f, %f\n",
   //       rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
 
   Class windowClass = [BaseWindow class];
-  // If we have a titlebar on a top-level window, we want to be able to control
-  // the titlebar color (for unified windows), so use the special ToolbarWindow
-  // class. Note that we need to check the window type because we mark sheets as
-  // having titlebars.
   if ((mWindowType == WindowType::TopLevel ||
        mWindowType == WindowType::Dialog) &&
-      (features & NSWindowStyleMaskTitled))
+      (features & NSWindowStyleMaskTitled)) {
+    // If we have a titlebar on a top-level window, we want to be able to
+    // control the titlebar color (for unified windows), so use the special
+    // ToolbarWindow class. Note that we need to check the window type because
+    // we mark sheets as having titlebars.
     windowClass = [ToolbarWindow class];
-  // If we're a popup window we need to use the PopupWindow class.
-  else if (mWindowType == WindowType::Popup)
+  } else if (mWindowType == WindowType::Popup) {
     windowClass = [PopupWindow class];
-  // If we're a non-popup borderless window we need to use the
-  // BorderlessWindow class.
-  else if (features == NSWindowStyleMaskBorderless)
+    // If we're a popup window we need to use the PopupWindow class.
+  } else if (features == NSWindowStyleMaskBorderless) {
+    // If we're a non-popup borderless window we need to use the
+    // BorderlessWindow class.
     windowClass = [BorderlessWindow class];
+  }
 
   // Create the window
   mWindow = [[windowClass alloc] initWithContentRect:contentRect
@@ -509,65 +512,60 @@ nsresult nsCocoaWindow::CreateNativeWindow(const NSRect& aRect,
 
   // Make sure that window titles don't leak to disk in private browsing mode
   // due to macOS' resume feature.
-  [mWindow setRestorable:!aIsPrivateBrowsing];
+  mWindow.restorable = !aIsPrivateBrowsing;
   if (aIsPrivateBrowsing) {
     [mWindow disableSnapshotRestoration];
   }
 
   // setup our notification delegate. Note that setDelegate: does NOT retain.
   mDelegate = [[WindowDelegate alloc] initWithGeckoWindow:this];
-  [mWindow setDelegate:mDelegate];
+  mWindow.delegate = mDelegate;
 
   // Make sure that the content rect we gave has been honored.
   NSRect wantedFrame = [mWindow frameRectForChildViewRect:contentRect];
-  if (!NSEqualRects([mWindow frame], wantedFrame)) {
+  if (!NSEqualRects(mWindow.frame, wantedFrame)) {
     // This can happen when the window is not on the primary screen.
     [mWindow setFrame:wantedFrame display:NO];
   }
   UpdateBounds();
 
   if (mWindowType == WindowType::Invisible) {
-    [mWindow setLevel:kCGDesktopWindowLevelKey];
+    mWindow.level = kCGDesktopWindowLevelKey;
   }
 
   if (mWindowType == WindowType::Popup) {
     SetPopupWindowLevel();
-    [mWindow setBackgroundColor:NSColor.clearColor];
-    [mWindow setOpaque:NO];
+    mWindow.backgroundColor = NSColor.clearColor;
+    mWindow.opaque = NO;
 
     // When multiple spaces are in use and the browser is assigned to a
     // particular space, override the "Assign To" space and display popups on
     // the active space. Does not work with multiple displays. See
     // NeedsRecreateToReshow() for multi-display with multi-space workaround.
-    if (!mAlwaysOnTop) {
-      NSWindowCollectionBehavior behavior = [mWindow collectionBehavior];
-      behavior |= NSWindowCollectionBehaviorMoveToActiveSpace;
-      [mWindow setCollectionBehavior:behavior];
-    }
+    mWindow.collectionBehavior = mWindow.collectionBehavior |
+                                 NSWindowCollectionBehaviorMoveToActiveSpace;
   } else {
     // Non-popup windows are always opaque.
-    [mWindow setOpaque:YES];
+    mWindow.opaque = YES;
   }
 
-  NSWindowCollectionBehavior newBehavior = [mWindow collectionBehavior];
-  if (mAlwaysOnTop) {
-    [mWindow setLevel:NSFloatingWindowLevel];
-    newBehavior |= NSWindowCollectionBehaviorCanJoinAllSpaces;
+  if (mAlwaysOnTop || mIsAlert) {
+    mWindow.level = NSFloatingWindowLevel;
+    mWindow.collectionBehavior =
+        mWindow.collectionBehavior | NSWindowCollectionBehaviorCanJoinAllSpaces;
   }
-  [mWindow setCollectionBehavior:newBehavior];
-
-  [mWindow setContentMinSize:NSMakeSize(60, 60)];
+  mWindow.contentMinSize = NSMakeSize(60, 60);
   [mWindow disableCursorRects];
 
   // Make the window use CoreAnimation from the start, so that we don't
   // switch from a non-CA window to a CA-window in the middle.
-  [[mWindow contentView] setWantsLayer:YES];
+  mWindow.contentView.wantsLayer = YES;
 
   // Make sure the window starts out not draggable by the background.
   // We will turn it on as necessary.
-  [mWindow setMovableByWindowBackground:NO];
+  mWindow.movableByWindowBackground = NO;
 
-  [[WindowDataMap sharedWindowDataMap] ensureDataForWindow:mWindow];
+  [WindowDataMap.sharedWindowDataMap ensureDataForWindow:mWindow];
   mWindowMadeHere = true;
 
   // Make the window respect the global appearance, which follows the
@@ -596,11 +594,11 @@ nsresult nsCocoaWindow::CreatePopupContentView(const LayoutDeviceIntRect& aRect,
     return rv;
   }
 
-  NSView* contentView = [mWindow contentView];
-  ChildView* childView =
-      (ChildView*)mPopupContentView->GetNativeData(NS_NATIVE_WIDGET);
-  [childView setFrame:[contentView bounds]];
-  [childView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+  NSView* contentView = mWindow.contentView;
+  auto* childView = static_cast<ChildView*>(
+      mPopupContentView->GetNativeData(NS_NATIVE_WIDGET));
+  childView.frame = contentView.bounds;
+  childView.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
   [contentView addSubview:childView];
 
   return NS_OK;
@@ -670,7 +668,7 @@ void* nsCocoaWindow::GetNativeData(uint32_t aDataType) {
     // to emulate how windows works, we always have to return a NSView
     // for NS_NATIVE_WIDGET
     case NS_NATIVE_WIDGET:
-      retVal = [mWindow contentView];
+      retVal = mWindow.contentView;
       break;
 
     case NS_NATIVE_WINDOW:
@@ -687,9 +685,9 @@ void* nsCocoaWindow::GetNativeData(uint32_t aDataType) {
       if (retVal) {
         break;
       }
-      NSView* view = mWindow ? [mWindow contentView] : nil;
+      NSView* view = mWindow ? mWindow.contentView : nil;
       if (view) {
-        retVal = [view inputContext];
+        retVal = view.inputContext;
       }
       // If inputContext isn't available on this window, return this window's
       // pointer instead of nullptr since if this returns nullptr,
@@ -792,10 +790,11 @@ void nsCocoaWindow::SetModal(bool aState) {
         gGeckoAppModalWindowList = gGeckoAppModalWindowList->prev;
         delete saved;  // "window" not ADDREFed
       }
-      if (mWindowType == WindowType::Popup)
+      if (mWindowType == WindowType::Popup) {
         SetPopupWindowLevel();
-      else
-        [mWindow setLevel:NSNormalWindowLevel];
+      } else {
+        mWindow.level = NSNormalWindowLevel;
+      }
     }
   }
 
@@ -810,43 +809,44 @@ void nsCocoaWindow::SetFakeModal(bool aState) {
 bool nsCocoaWindow::IsRunningAppModal() { return [NSApp _isRunningAppModal]; }
 
 // Hide or show this window
-void nsCocoaWindow::Show(bool bState) {
+void nsCocoaWindow::Show(bool aState) {
   NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
 
-  if (!mWindow) return;
+  if (!mWindow) {
+    return;
+  }
 
   if (!mSheetNeedsShow) {
     // Early exit if our current visibility state is already the requested
     // state.
-    if (bState == ([mWindow isVisible] || [mWindow isBeingShown])) {
+    if (aState == mWindow.isVisibleOrBeingShown) {
       return;
     }
   }
 
-  [mWindow setBeingShown:bState];
-  if (bState && !mWasShown) {
+  [mWindow setBeingShown:aState];
+  if (aState && !mWasShown) {
     mWasShown = true;
   }
 
   nsIWidget* parentWidget = mParent;
   nsCOMPtr<nsPIWidgetCocoa> piParentWidget(do_QueryInterface(parentWidget));
   NSWindow* nativeParentWindow =
-      (parentWidget) ? (NSWindow*)parentWidget->GetNativeData(NS_NATIVE_WINDOW)
-                     : nil;
+      parentWidget ? (NSWindow*)parentWidget->GetNativeData(NS_NATIVE_WINDOW)
+                   : nil;
 
-  if (bState && !mBounds.IsEmpty()) {
+  if (aState && !mBounds.IsEmpty()) {
     // If we had set the activationPolicy to accessory, then right now we won't
     // have a dock icon. Make sure that we undo that and show a dock icon now
     // that we're going to show a window.
-    if ([NSApp activationPolicy] != NSApplicationActivationPolicyRegular) {
-      [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+    if (NSApp.activationPolicy != NSApplicationActivationPolicyRegular) {
+      NSApp.activationPolicy = NSApplicationActivationPolicyRegular;
       PR_SetEnv("MOZ_APP_NO_DOCK=");
     }
 
     // Don't try to show a popup when the parent isn't visible or is minimized.
     if (mWindowType == WindowType::Popup && nativeParentWindow) {
-      if (![nativeParentWindow isVisible] ||
-          [nativeParentWindow isMiniaturized]) {
+      if (!nativeParentWindow.isVisible || nativeParentWindow.isMiniaturized) {
         return;
       }
     }
@@ -947,7 +947,7 @@ void nsCocoaWindow::Show(bool bState) {
       // close other programs' context menus when ours open.
       if ([mWindow isKindOfClass:[PopupWindow class]] &&
           [(PopupWindow*)mWindow isContextMenu]) {
-        [[NSDistributedNotificationCenter defaultCenter]
+        [NSDistributedNotificationCenter.defaultCenter
             postNotificationName:
                 @"com.apple.HIToolbox.beginMenuTrackingNotification"
                           object:@"org.mozilla.gecko.PopupWindow"];
@@ -958,8 +958,9 @@ void nsCocoaWindow::Show(bool bState) {
       // appear above the parent and move when the parent does. Setting this
       // needs to happen after the _setWindowNumber calls above, otherwise the
       // window doesn't focus properly.
-      if (nativeParentWindow && mPopupLevel == PopupLevel::Parent)
+      if (nativeParentWindow && mPopupLevel == PopupLevel::Parent) {
         [nativeParentWindow addChildWindow:mWindow ordered:NSWindowAbove];
+      }
     } else {
       NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
       if (mWindowType == WindowType::TopLevel &&
@@ -983,9 +984,9 @@ void nsCocoaWindow::Show(bool bState) {
         mWindowAnimationBehavior = behavior;
       }
 
-      // We don't want alwaysontop windows to pull focus when they're opened,
-      // as these tend to be for peripheral indicators and displays.
-      if (mAlwaysOnTop) {
+      // We don't want alwaysontop / alert windows to pull focus when they're
+      // opened, as these tend to be for peripheral indicators and displays.
+      if (mAlwaysOnTop || mIsAlert) {
         [mWindow orderFront:nil];
       } else {
         [mWindow makeKeyAndOrderFront:nil];
@@ -1099,8 +1100,9 @@ void nsCocoaWindow::Show(bool bState) {
       // If the window is a popup window with a parent window we need to
       // unhook it here before ordering it out. When you order out the child
       // of a window it hides the parent window.
-      if (mWindowType == WindowType::Popup && nativeParentWindow)
+      if (mWindowType == WindowType::Popup && nativeParentWindow) {
         [nativeParentWindow removeChildWindow:mWindow];
+      }
 
       [mWindow orderOut:nil];
 
@@ -1129,8 +1131,8 @@ void nsCocoaWindow::Show(bool bState) {
 bool nsCocoaWindow::NeedsRecreateToReshow() {
   // Limit the workaround to popup windows because only they need to override
   // the "Assign To" setting. i.e., to display where the parent window is.
-  return (mWindowType == WindowType::Popup) && mWasShown &&
-         ([[NSScreen screens] count] > 1);
+  return mWindowType == WindowType::Popup && mWasShown &&
+         NSScreen.screens.count > 1;
 }
 
 WindowRenderer* nsCocoaWindow::GetWindowRenderer() {
@@ -1143,8 +1145,8 @@ WindowRenderer* nsCocoaWindow::GetWindowRenderer() {
 TransparencyMode nsCocoaWindow::GetTransparencyMode() {
   NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
 
-  return (!mWindow || [mWindow isOpaque]) ? TransparencyMode::Opaque
-                                          : TransparencyMode::Transparent;
+  return !mWindow || mWindow.isOpaque ? TransparencyMode::Opaque
+                                      : TransparencyMode::Transparent;
 
   NS_OBJC_END_TRY_BLOCK_RETURN(TransparencyMode::Opaque);
 }
@@ -1162,9 +1164,9 @@ void nsCocoaWindow::SetTransparencyMode(TransparencyMode aMode) {
   if (isTransparent == currentTransparency) {
     return;
   }
-  [mWindow setOpaque:!isTransparent];
-  [mWindow setBackgroundColor:(isTransparent ? NSColor.clearColor
-                                             : NSColor.whiteColor)];
+  mWindow.opaque = !isTransparent;
+  mWindow.backgroundColor =
+      isTransparent ? NSColor.clearColor : NSColor.whiteColor;
 
   NS_OBJC_END_TRY_IGNORE_BLOCK;
 }
@@ -1184,7 +1186,7 @@ void nsCocoaWindow::ConstrainPosition(DesktopIntPoint& aPoint) {
 
   int32_t width, height;
 
-  NSRect frame = [mWindow frame];
+  NSRect frame = mWindow.frame;
 
   // zero size rects confuse the screen manager
   width = std::max<int32_t>(frame.size.width, 1);
@@ -1243,7 +1245,7 @@ void nsCocoaWindow::SetSizeConstraints(const SizeConstraints& aConstraints) {
   NSSize minSize = {
       nsCocoaUtils::DevPixelsToCocoaPoints(c.mMinSize.width, c.mScale.scale),
       nsCocoaUtils::DevPixelsToCocoaPoints(c.mMinSize.height, c.mScale.scale)};
-  [mWindow setMinSize:minSize];
+  mWindow.minSize = minSize;
 
   c.mMaxSize.width = std::max(
       nsCocoaUtils::CocoaPointsToDevPixels(c.mMaxSize.width, c.mScale.scale),
@@ -1259,8 +1261,7 @@ void nsCocoaWindow::SetSizeConstraints(const SizeConstraints& aConstraints) {
       c.mMaxSize.height == NS_MAXSIZE ? FLT_MAX
                                       : nsCocoaUtils::DevPixelsToCocoaPoints(
                                             c.mMaxSize.height, c.mScale.scale)};
-  [mWindow setMaxSize:maxSize];
-
+  mWindow.maxSize = maxSize;
   nsBaseWidget::SetSizeConstraints(c);
 
   NS_OBJC_END_TRY_IGNORE_BLOCK;
@@ -1280,7 +1281,7 @@ void nsCocoaWindow::Move(double aX, double aY) {
       static_cast<float>(aX),
       static_cast<float>(nsCocoaUtils::FlippedScreenY(NSToIntRound(aY)))};
 
-  NSRect frame = [mWindow frame];
+  NSRect frame = mWindow.frame;
   if (frame.origin.x != coord.x ||
       frame.origin.y + frame.size.height != coord.y) {
     [mWindow setFrameTopLeftPoint:coord];
@@ -1488,13 +1489,9 @@ void nsCocoaWindow::MoveToWorkspace(const nsAString& workspaceIDStr) {
 
 void nsCocoaWindow::SuppressAnimation(bool aSuppress) {
   if ([mWindow respondsToSelector:@selector(setAnimationBehavior:)]) {
-    if (aSuppress) {
-      [mWindow setIsAnimationSuppressed:YES];
-      [mWindow setAnimationBehavior:NSWindowAnimationBehaviorNone];
-    } else {
-      [mWindow setIsAnimationSuppressed:NO];
-      [mWindow setAnimationBehavior:mWindowAnimationBehavior];
-    }
+    mWindow.isAnimationSuppressed = aSuppress;
+    mWindow.animationBehavior =
+        aSuppress ? NSWindowAnimationBehaviorNone : mWindowAnimationBehavior;
   }
 }
 
@@ -1506,10 +1503,11 @@ void nsCocoaWindow::HideWindowChrome(bool aShouldHide) {
 
   if (!mWindow || !mWindowMadeHere ||
       (mWindowType != WindowType::TopLevel &&
-       mWindowType != WindowType::Dialog))
+       mWindowType != WindowType::Dialog)) {
     return;
+  }
 
-  BOOL isVisible = [mWindow isVisible];
+  const BOOL isVisible = mWindow.isVisible;
 
   // Remove child windows.
   NSArray* childWindows = [mWindow childWindows];
@@ -1530,7 +1528,7 @@ void nsCocoaWindow::HideWindowChrome(bool aShouldHide) {
   NSMutableDictionary* state = [mWindow exportState];
 
   // Recreate the window with the right border style.
-  NSRect frameRect = [mWindow frame];
+  NSRect frameRect = mWindow.frame;
   DestroyNativeWindow();
   nsresult rv = CreateNativeWindow(
       frameRect, aShouldHide ? BorderStyle::None : mBorderStyle, true,
@@ -1629,7 +1627,7 @@ static bool AlwaysUsesNativeFullScreen() {
   NSScreen* cocoaScreen = ScreenHelperCocoa::CocoaScreenForScreen(widgetScreen);
 
   NSWindow* win =
-      [[NSWindow alloc] initWithContentRect:[cocoaScreen frame]
+      [[NSWindow alloc] initWithContentRect:cocoaScreen.frame
                                   styleMask:NSWindowStyleMaskBorderless
                                     backing:NSBackingStoreBuffered
                                       defer:YES];
@@ -2075,7 +2073,7 @@ void nsCocoaWindow::DoResize(double aX, double aY, double aWidth,
   // convert requested bounds into Cocoa coordinate system
   NSRect newFrame = nsCocoaUtils::GeckoRectToCocoaRect(newBounds);
 
-  NSRect frame = [mWindow frame];
+  NSRect frame = mWindow.frame;
   BOOL isMoving = newFrame.origin.x != frame.origin.x ||
                   newFrame.origin.y != frame.origin.y;
   BOOL isResizing = newFrame.size.width != frame.size.width ||
@@ -2114,7 +2112,7 @@ NSRect nsCocoaWindow::GetClientCocoaRect() {
     return NSZeroRect;
   }
 
-  return [mWindow childViewRectForFrameRect:[mWindow frame]];
+  return [mWindow childViewRectForFrameRect:mWindow.frame];
 }
 
 LayoutDeviceIntRect nsCocoaWindow::GetClientBounds() {
@@ -2130,7 +2128,7 @@ LayoutDeviceIntRect nsCocoaWindow::GetClientBounds() {
 void nsCocoaWindow::UpdateBounds() {
   NSRect frame = NSZeroRect;
   if (mWindow) {
-    frame = [mWindow frame];
+    frame = mWindow.frame;
   }
   mBounds =
       nsCocoaUtils::CocoaRectToGeckoRectDevPix(frame, BackingScaleFactor());
@@ -2145,7 +2143,7 @@ LayoutDeviceIntRect nsCocoaWindow::GetScreenBounds() {
 
 #ifdef DEBUG
   LayoutDeviceIntRect r = nsCocoaUtils::CocoaRectToGeckoRectDevPix(
-      [mWindow frame], BackingScaleFactor());
+      mWindow.frame, BackingScaleFactor());
   NS_ASSERTION(mWindow && mBounds == r, "mBounds out of sync!");
 #endif
 
@@ -2157,7 +2155,7 @@ LayoutDeviceIntRect nsCocoaWindow::GetScreenBounds() {
 double nsCocoaWindow::GetDefaultScaleInternal() { return BackingScaleFactor(); }
 
 static CGFloat GetBackingScaleFactor(NSWindow* aWindow) {
-  NSRect frame = [aWindow frame];
+  NSRect frame = aWindow.frame;
   if (frame.size.width > 0 && frame.size.height > 0) {
     return nsCocoaUtils::GetBackingScaleFactor(aWindow);
   }
@@ -2220,6 +2218,7 @@ void nsCocoaWindow::BackingScaleFactorChanged() {
   }
 
   mBackingScaleFactor = newScale;
+  NotifyAPZOfDPIChange();
 
   if (!mWidgetListener || mWidgetListener->GetAppWindow()) {
     return;
@@ -2255,7 +2254,7 @@ nsresult nsCocoaWindow::SetTitle(const nsAString& aTitle) {
   const unichar* uniTitle = reinterpret_cast<const unichar*>(strTitle.get());
   NSString* title = [NSString stringWithCharacters:uniTitle
                                             length:strTitle.Length()];
-  if ([mWindow drawsContentsIntoWindowFrame] && ![mWindow wantsTitleDrawn]) {
+  if (mWindow.drawsContentsIntoWindowFrame && !mWindow.wantsTitleDrawn) {
     // Don't cause invalidations when the title isn't displayed.
     [mWindow disableSetNeedsDisplay];
     [mWindow setTitle:title];
@@ -2291,9 +2290,10 @@ bool nsCocoaWindow::DragEvent(unsigned int aMessage,
 NS_IMETHODIMP nsCocoaWindow::SendSetZLevelEvent() {
   nsWindowZ placement = nsWindowZTop;
   nsCOMPtr<nsIWidget> actualBelow;
-  if (mWidgetListener)
+  if (mWidgetListener) {
     mWidgetListener->ZLevelChanged(true, &placement, nullptr,
                                    getter_AddRefs(actualBelow));
+  }
   return NS_OK;
 }
 
@@ -2344,8 +2344,9 @@ nsresult nsCocoaWindow::DispatchEvent(WidgetGUIEvent* event,
   nsCOMPtr<nsIWidget> kungFuDeathGrip(event->mWidget);
   mozilla::Unused << kungFuDeathGrip;  // Not used within this function
 
-  if (mWidgetListener)
+  if (mWidgetListener) {
     aStatus = mWidgetListener->HandleEvent(event, mUseAttachedEvents);
+  }
 
   return NS_OK;
 }
@@ -2355,10 +2356,15 @@ nsresult nsCocoaWindow::DispatchEvent(WidgetGUIEvent* event,
 // canonical indicator that a window is currently full screen and it makes sense
 // to keep all sizemode logic here.
 static nsSizeMode GetWindowSizeMode(NSWindow* aWindow, bool aFullScreen) {
-  if (aFullScreen) return nsSizeMode_Fullscreen;
-  if ([aWindow isMiniaturized]) return nsSizeMode_Minimized;
-  if (([aWindow styleMask] & NSWindowStyleMaskResizable) && [aWindow isZoomed])
+  if (aFullScreen) {
+    return nsSizeMode_Fullscreen;
+  }
+  if (aWindow.isMiniaturized) {
+    return nsSizeMode_Minimized;
+  }
+  if ((aWindow.styleMask & NSWindowStyleMaskResizable) && aWindow.isZoomed) {
     return nsSizeMode_Maximized;
+  }
   return nsSizeMode_Normal;
 }
 
@@ -2379,7 +2385,7 @@ void nsCocoaWindow::ReportMoveEvent() {
   // The zoomed state can change when we're moving, in which case we need to
   // update our internal mSizeMode. This can happen either if we're maximized
   // and then moved, or if we're not maximized and moved back to zoomed state.
-  if (mWindow && ((mSizeMode == nsSizeMode_Maximized) ^ [mWindow isZoomed])) {
+  if (mWindow && (mSizeMode == nsSizeMode_Maximized) ^ mWindow.isZoomed) {
     DispatchSizeModeEvent();
   }
 
@@ -2462,8 +2468,9 @@ void nsCocoaWindow::SetMenuBar(RefPtr<nsMenuBarX>&& aMenuBar) {
   // displayed when the app starts up.
   if (mMenuBar && ((!gSomeMenuBarPainted &&
                     nsMenuUtilsX::GetHiddenWindowMenuBar() == mMenuBar) ||
-                   [mWindow isMainWindow]))
+                   mWindow.isMainWindow)) {
     mMenuBar->Paint();
+  }
 }
 
 void nsCocoaWindow::SetFocus(Raise aRaise,
@@ -2474,12 +2481,10 @@ void nsCocoaWindow::SetFocus(Raise aRaise,
     return mPopupContentView->SetFocus(aRaise, aCallerType);
   }
 
-  if (aRaise == Raise::Yes &&
-      ([mWindow isVisible] || [mWindow isMiniaturized])) {
-    if ([mWindow isMiniaturized]) {
+  if (aRaise == Raise::Yes && (mWindow.isVisible || mWindow.isMiniaturized)) {
+    if (mWindow.isMiniaturized) {
       [mWindow deminiaturize:nil];
     }
-
     [mWindow makeKeyAndOrderFront:nil];
     SendSetZLevelEvent();
   }
@@ -2533,7 +2538,7 @@ void nsCocoaWindow::CaptureRollupEvents(bool aDoCapture) {
   NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
 
   if (aDoCapture) {
-    if (![NSApp isActive]) {
+    if (!NSApp.isActive) {
       // We need to capture mouse event if we aren't
       // the active application. We only set this up when needed
       // because they cause spurious mouse event after crash
@@ -2553,14 +2558,17 @@ void nsCocoaWindow::CaptureRollupEvents(bool aDoCapture) {
     // So here we fiddle with a non-native popup window's level to make sure the
     // "active" one is always above any other non-native popup windows that
     // may be visible.
-    if (mWindow && (mWindowType == WindowType::Popup)) SetPopupWindowLevel();
+    if (mWindowType == WindowType::Popup) {
+      SetPopupWindowLevel();
+    }
   } else {
     nsToolkit::GetToolkit()->StopMonitoringAllProcessMouseEvents();
 
     // XXXndeakin this doesn't make sense.
     // Why is the new window assumed to be a modal panel?
-    if (mWindow && (mWindowType == WindowType::Popup))
-      [mWindow setLevel:NSModalPanelWindowLevel];
+    if (mWindow && mWindowType == WindowType::Popup) {
+      mWindow.level = NSModalPanelWindowLevel;
+    }
   }
 
   NS_OBJC_END_TRY_IGNORE_BLOCK;
@@ -2644,7 +2652,7 @@ void nsCocoaWindow::SetWindowTransform(const gfx::Matrix& aTransform) {
 
   // Calling CGSSetWindowTransform when the window is not visible results in
   // misplacing the window into doubled x,y coordinates (see bug 1448132).
-  if (![mWindow isVisible] || NSIsEmptyRect([mWindow frame])) {
+  if (!mWindow.isVisible || NSIsEmptyRect(mWindow.frame)) {
     return;
   }
 
@@ -2753,13 +2761,9 @@ void nsCocoaWindow::SetWindowAnimationType(
 void nsCocoaWindow::SetDrawsTitle(bool aDrawTitle) {
   NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
 
-  if (![mWindow drawsContentsIntoWindowFrame]) {
-    // If we don't draw into the window frame, we always want to display window
-    // titles.
-    [mWindow setWantsTitleDrawn:YES];
-  } else {
-    [mWindow setWantsTitleDrawn:aDrawTitle];
-  }
+  // If we don't draw into the window frame, we always want to display window
+  // titles.
+  mWindow.wantsTitleDrawn = aDrawTitle || !mWindow.drawsContentsIntoWindowFrame;
 
   NS_OBJC_END_TRY_IGNORE_BLOCK;
 }
@@ -2853,19 +2857,13 @@ void nsCocoaWindow::UpdateThemeGeometries(
 }
 
 void nsCocoaWindow::SetPopupWindowLevel() {
-  if (!mWindow) return;
-
-  // Floating popups are at the floating level and hide when the window is
-  // deactivated.
-  if (mPopupLevel == PopupLevel::Floating) {
-    [mWindow setLevel:NSFloatingWindowLevel];
-    [mWindow setHidesOnDeactivate:YES];
-  } else {
-    // Otherwise, this is a top-level or parent popup. Parent popups always
-    // appear just above their parent and essentially ignore the level.
-    [mWindow setLevel:NSPopUpMenuWindowLevel];
-    [mWindow setHidesOnDeactivate:NO];
+  if (!mWindow) {
+    return;
   }
+  // Otherwise, this is a top-level or parent popup. Parent popups always
+  // appear just above their parent and essentially ignore the level.
+  mWindow.level = NSPopUpMenuWindowLevel;
+  mWindow.hidesOnDeactivate = NO;
 }
 
 void nsCocoaWindow::SetInputContext(const InputContext& aContext,
@@ -2897,7 +2895,7 @@ bool nsCocoaWindow::GetEditCommands(NativeKeyBindingsType aType,
 
 void nsCocoaWindow::PauseOrResumeCompositor(bool aPause) {
   if (auto* mainChildView =
-          static_cast<nsIWidget*>([[mWindow mainChildView] widget])) {
+          static_cast<nsIWidget*>(mWindow.mainChildView.widget)) {
     mainChildView->PauseOrResumeCompositor(aPause);
   }
 }
@@ -2951,16 +2949,17 @@ already_AddRefed<nsIWidget> nsIWidget::CreateChildWindow() {
   nsCocoaWindow* geckoWidget = [windowDelegate geckoWidget];
   NS_ASSERTION(geckoWidget, "Window delegate not returning a gecko widget!");
 
-  nsMenuBarX* geckoMenuBar = geckoWidget->GetMenuBar();
-  if (geckoMenuBar) {
+  if (nsMenuBarX* geckoMenuBar = geckoWidget->GetMenuBar()) {
     geckoMenuBar->Paint();
   } else {
     // sometimes we don't have a native application menu early in launching
-    if (!sApplicationMenu) return;
+    if (!sApplicationMenu) {
+      return;
+    }
 
-    NSMenu* mainMenu = [NSApp mainMenu];
+    NSMenu* mainMenu = NSApp.mainMenu;
     NS_ASSERTION(
-        [mainMenu numberOfItems] > 0,
+        mainMenu.numberOfItems > 0,
         "Main menu does not have any items, something is terribly wrong!");
 
     // Create a new menu bar.
@@ -2976,7 +2975,7 @@ already_AddRefed<nsIWidget> nsIWidget::CreateChildWindow() {
     [firstMenuItem release];
 
     // set our new menu bar as the main menu
-    [NSApp setMainMenu:newMenuBar];
+    NSApp.mainMenu = newMenuBar;
     [newMenuBar release];
   }
 
@@ -3097,8 +3096,8 @@ void nsCocoaWindow::CocoaWindowDidResize() {
   // in fullscreen mode.  In Safari they're not transparent.  But in Firefox
   // for some reason they are, which causes bug 1069658.  The following code
   // works around this Apple bug or design flaw.
-  NSWindow* window = (NSWindow*)[notification object];
-  NSView* frameView = [[window contentView] superview];
+  NSWindow* window = notification.object;
+  NSView* frameView = window.contentView.superview;
   NSView* titlebarView = nil;
   NSView* titlebarContainerView = nil;
   if ([frameView respondsToSelector:@selector(titlebarView)]) {
@@ -3142,9 +3141,13 @@ void nsCocoaWindow::CocoaWindowDidResize() {
 
   // [NSApp _isRunningAppModal] will return true if we're running an OS dialog
   // app modally. If one of those is up then we want it to retain its menu bar.
-  if ([NSApp _isRunningAppModal]) return;
-  NSWindow* window = [aNotification object];
-  if (window) [WindowDelegate paintMenubarForWindow:window];
+  if (NSApp._isRunningAppModal) {
+    return;
+  }
+  NSWindow* window = aNotification.object;
+  if (window) {
+    [WindowDelegate paintMenubarForWindow:window];
+  }
 
   if ([window isKindOfClass:[ToolbarWindow class]]) {
     [(ToolbarWindow*)window windowMainStateChanged];
@@ -3254,8 +3257,9 @@ void nsCocoaWindow::CocoaWindowDidResize() {
 }
 
 - (BOOL)windowShouldZoom:(NSWindow*)window toFrame:(NSRect)proposedFrame {
-  if (!mHasEverBeenZoomed && [window isZoomed]) return NO;  // See bug 429954.
-
+  if (!mHasEverBeenZoomed && window.isZoomed) {
+    return NO;  // See bug 429954.
+  }
   mHasEverBeenZoomed = YES;
   return YES;
 }
@@ -3298,7 +3302,7 @@ void nsCocoaWindow::CocoaWindowDidResize() {
   if ([window respondsToSelector:@selector(backingScaleFactor)]) {
     CGFloat oldFactor = [[[aNotification userInfo]
         objectForKey:@"NSBackingPropertyOldScaleFactorKey"] doubleValue];
-    if ([window backingScaleFactor] != oldFactor) {
+    if (window.backingScaleFactor != oldFactor) {
       mGeckoWindow->BackingScaleFactorChanged();
     }
   }
@@ -3349,7 +3353,7 @@ void nsCocoaWindow::CocoaWindowDidResize() {
   if (![self.window isKindOfClass:[ToolbarWindow class]]) {
     return self.FrameView__closeButtonOrigin;
   }
-  ToolbarWindow* win = (ToolbarWindow*)[self window];
+  auto* win = static_cast<ToolbarWindow*>(self.window);
   if (win.drawsContentsIntoWindowFrame &&
       !(win.styleMask & NSWindowStyleMaskFullScreen) &&
       (win.styleMask & NSWindowStyleMaskTitled)) {
@@ -3360,8 +3364,9 @@ void nsCocoaWindow::CocoaWindowDidResize() {
       // for the vertical coordinate will move the buttons above the window,
       // making them invisible.
       return NSMakePoint(buttonsRect.origin.x, win.frame.size.height);
-    } else if (win.windowTitlebarLayoutDirection ==
-               NSUserInterfaceLayoutDirectionRightToLeft) {
+    }
+    if (win.windowTitlebarLayoutDirection ==
+        NSUserInterfaceLayoutDirectionRightToLeft) {
       // We're in RTL mode, which means that the close button is the rightmost
       // button of the three window buttons. and buttonsRect.origin is the
       // bottom left corner of the green (zoom) button. The close button is 40px
@@ -3375,13 +3380,14 @@ void nsCocoaWindow::CocoaWindowDidResize() {
 }
 
 - (CGFloat)FrameView__titlebarHeight {
+  // XXX: Shouldn't this be [super FrameView__titlebarHeight]?
   CGFloat height = [self FrameView__titlebarHeight];
-  if ([[self window] isKindOfClass:[ToolbarWindow class]]) {
+  if ([self.window isKindOfClass:[ToolbarWindow class]]) {
     // Make sure that the titlebar height includes our shifted buttons.
     // The following coordinates are in window space, with the origin being at
     // the bottom left corner of the window.
-    ToolbarWindow* win = (ToolbarWindow*)[self window];
-    CGFloat frameHeight = [self frame].size.height;
+    auto* win = static_cast<ToolbarWindow*>(self.window);
+    CGFloat frameHeight = self.frame.size.height;
     CGFloat windowButtonY = frameHeight;
     if (!NSIsEmptyRect(win.windowButtonsRect) &&
         win.drawsContentsIntoWindowFrame &&
@@ -3506,8 +3512,8 @@ static NSImage* GetMenuMaskImage() {
 }
 
 - (void)swapOutChildViewWrapper:(NSView*)aNewWrapper {
-  [aNewWrapper setFrame:[[self contentView] frame]];
-  NSView* childView = [[self mainChildView] retain];
+  aNewWrapper.frame = self.contentView.frame;
+  NSView* childView = [self.mainChildView retain];
   [childView removeFromSuperview];
   [aNewWrapper addSubview:childView];
   [childView release];
@@ -3603,16 +3609,16 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 
 - (NSMutableDictionary*)exportState {
   NSMutableDictionary* state = [NSMutableDictionary dictionaryWithCapacity:10];
-  if (NSString* title = [self title]) {
+  if (NSString* title = self.title) {
     [state setObject:title forKey:kStateTitleKey];
   }
-  [state setObject:[NSNumber numberWithBool:[self drawsContentsIntoWindowFrame]]
+  [state setObject:[NSNumber numberWithBool:self.drawsContentsIntoWindowFrame]
             forKey:kStateDrawsContentsIntoWindowFrameKey];
-  [state setObject:[NSNumber numberWithBool:[self showsToolbarButton]]
+  [state setObject:[NSNumber numberWithBool:self.showsToolbarButton]
             forKey:kStateShowsToolbarButton];
-  [state setObject:[NSNumber numberWithUnsignedInt:[self collectionBehavior]]
+  [state setObject:[NSNumber numberWithUnsignedInt:self.collectionBehavior]
             forKey:kStateCollectionBehavior];
-  [state setObject:[NSNumber numberWithBool:[self wantsTitleDrawn]]
+  [state setObject:[NSNumber numberWithBool:self.wantsTitleDrawn]
             forKey:kStateWantsTitleDrawn];
   return state;
 }
@@ -3667,17 +3673,17 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 }
 
 - (NSView*)trackingAreaView {
-  NSView* contentView = [self contentView];
-  return [contentView superview] ? [contentView superview] : contentView;
+  NSView* contentView = self.contentView;
+  return contentView.superview ? contentView.superview : contentView;
 }
 
 - (NSArray<NSView*>*)contentViewContents {
-  return [[[[self contentView] subviews] copy] autorelease];
+  return [[self.contentView.subviews copy] autorelease];
 }
 
 - (ChildView*)mainChildView {
-  NSView* contentView = [self contentView];
-  NSView* lastView = [[contentView subviews] lastObject];
+  NSView* contentView = self.contentView;
+  NSView* lastView = contentView.subviews.lastObject;
   if ([lastView isKindOfClass:[ChildView class]]) {
     return (ChildView*)lastView;
   }
@@ -3686,7 +3692,7 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 
 - (void)removeTrackingArea {
   if (mTrackingArea) {
-    [[self trackingAreaView] removeTrackingArea:mTrackingArea];
+    [self.trackingAreaView removeTrackingArea:mTrackingArea];
     [mTrackingArea release];
     mTrackingArea = nil;
   }
@@ -3695,7 +3701,7 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 - (void)updateTrackingArea {
   [self removeTrackingArea];
 
-  NSView* view = [self trackingAreaView];
+  NSView* view = self.trackingAreaView;
   const NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited |
                                         NSTrackingMouseMoved |
                                         NSTrackingActiveAlways;
@@ -3741,7 +3747,7 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 
 // Possibly move the titlebar buttons.
 - (void)reflowTitlebarElements {
-  NSView* frameView = [[self contentView] superview];
+  NSView* frameView = self.contentView.superview;
   if ([frameView respondsToSelector:@selector(_tileTitlebarAndRedisplay:)]) {
     [frameView _tileTitlebarAndRedisplay:NO];
   }
@@ -3852,15 +3858,15 @@ static const NSString* kStateWantsTitleDrawn = @"wantsTitleDrawn";
 }
 
 - (void)mouseUp:(NSEvent*)event {
-  if ([event clickCount] == 2) {
+  if (event.clickCount == 2) {
     // Handle titlebar double click. We don't get the window's default behavior
     // here because the window uses NSWindowStyleMaskFullSizeContentView, and
     // this view (the titlebar gradient view) is technically part of the window
     // "contents" (it's a subview of the content view).
     if (nsCocoaUtils::ShouldZoomOnTitlebarDoubleClick()) {
-      [[self window] performZoom:nil];
+      [self.window performZoom:nil];
     } else if (nsCocoaUtils::ShouldMinimizeOnTitlebarDoubleClick()) {
-      [[self window] performMiniaturize:nil];
+      [self.window performMiniaturize:nil];
     }
   }
 }
@@ -4094,8 +4100,7 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
 }
 
 - (NSArray<NSView*>*)contentViewContents {
-  NSMutableArray<NSView*>* contents =
-      [[[self contentView] subviews] mutableCopy];
+  NSMutableArray<NSView*>* contents = [[self.contentView subviews] mutableCopy];
   if (mTitlebarView) {
     // Do not include the titlebar gradient view in the returned array.
     [contents removeObject:mTitlebarView];
@@ -4105,16 +4110,16 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
 
 - (void)updateTitlebarView {
   BOOL needTitlebarView =
-      ![self drawsContentsIntoWindowFrame] || mUnifiedToolbarHeight > 0;
+      !self.drawsContentsIntoWindowFrame || mUnifiedToolbarHeight > 0;
   if (needTitlebarView && !mTitlebarView) {
     mTitlebarView =
-        [[MOZTitlebarView alloc] initWithFrame:[self unifiedToolbarRect]];
+        [[MOZTitlebarView alloc] initWithFrame:self.unifiedToolbarRect];
     mTitlebarView.autoresizingMask = NSViewWidthSizable | NSViewMinYMargin;
     [self.contentView addSubview:mTitlebarView
                       positioned:NSWindowBelow
                       relativeTo:nil];
   } else if (needTitlebarView && mTitlebarView) {
-    mTitlebarView.frame = [self unifiedToolbarRect];
+    mTitlebarView.frame = self.unifiedToolbarRect;
   } else if (!needTitlebarView && mTitlebarView) {
     [mTitlebarView removeFromSuperview];
     [mTitlebarView release];
@@ -4132,15 +4137,15 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
 }
 
 - (NSRect)titlebarRect {
-  CGFloat titlebarHeight = [self titlebarHeight];
-  return NSMakeRect(0, [self frame].size.height - titlebarHeight,
-                    [self frame].size.width, titlebarHeight);
+  CGFloat titlebarHeight = self.titlebarHeight;
+  return NSMakeRect(0, self.frame.size.height - titlebarHeight,
+                    self.frame.size.width, titlebarHeight);
 }
 
 // In window contentView coordinates (origin bottom left)
 - (NSRect)unifiedToolbarRect {
-  return NSMakeRect(0, [self frame].size.height - mUnifiedToolbarHeight,
-                    [self frame].size.width, mUnifiedToolbarHeight);
+  return NSMakeRect(0, self.frame.size.height - mUnifiedToolbarHeight,
+                    self.frame.size.width, mUnifiedToolbarHeight);
 }
 
 // Returns the unified height of titlebar + toolbar.
@@ -4152,8 +4157,8 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
   // We use the original content rect here, not what we return from
   // [self contentRectForFrameRect:], because that would give us a
   // titlebarHeight of zero.
-  NSRect frameRect = [self frame];
-  NSUInteger styleMask = [self styleMask];
+  NSRect frameRect = self.frame;
+  NSUInteger styleMask = self.styleMask;
   styleMask &= ~NSWindowStyleMaskFullSizeContentView;
   NSRect originalContentRect = [NSWindow contentRectForFrameRect:frameRect
                                                        styleMask:styleMask];
@@ -4172,16 +4177,15 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
 // Extending the content area into the title bar works by resizing the
 // mainChildView so that it covers the titlebar.
 - (void)setDrawsContentsIntoWindowFrame:(BOOL)aState {
-  BOOL stateChanged = ([self drawsContentsIntoWindowFrame] != aState);
+  BOOL stateChanged = self.drawsContentsIntoWindowFrame != aState;
   [super setDrawsContentsIntoWindowFrame:aState];
-  if (stateChanged && [[self delegate] isKindOfClass:[WindowDelegate class]]) {
+  if (stateChanged && [self.delegate isKindOfClass:[WindowDelegate class]]) {
     // Here we extend / shrink our mainChildView. We do that by firing a resize
     // event which will cause the ChildView to be resized to the rect returned
     // by nsCocoaWindow::GetClientBounds. GetClientBounds bases its return
     // value on what we return from drawsContentsIntoWindowFrame.
-    WindowDelegate* windowDelegate = (WindowDelegate*)[self delegate];
-    nsCocoaWindow* geckoWindow = [windowDelegate geckoWidget];
-    if (geckoWindow) {
+    auto* windowDelegate = static_cast<WindowDelegate*>(self.delegate);
+    if (nsCocoaWindow* geckoWindow = windowDelegate.geckoWidget) {
       // Re-layout our contents.
       geckoWindow->ReportSizeEvent();
     }
@@ -4233,13 +4237,16 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
 
   RollUpPopups();
 
-  if ([[self delegate] isKindOfClass:[WindowDelegate class]]) {
-    WindowDelegate* windowDelegate = (WindowDelegate*)[self delegate];
-    nsCocoaWindow* geckoWindow = [windowDelegate geckoWidget];
-    if (!geckoWindow) return;
+  if ([self.delegate isKindOfClass:[WindowDelegate class]]) {
+    auto* windowDelegate = static_cast<WindowDelegate*>(self.delegate);
+    nsCocoaWindow* geckoWindow = windowDelegate.geckoWidget;
+    if (!geckoWindow) {
+      return;
+    }
 
-    nsIWidgetListener* listener = geckoWindow->GetWidgetListener();
-    if (listener) listener->OSToolbarButtonPressed();
+    if (nsIWidgetListener* listener = geckoWindow->GetWidgetListener()) {
+      listener->OSToolbarButtonPressed();
+    }
   }
 
   NS_OBJC_END_TRY_IGNORE_BLOCK;
@@ -4278,14 +4285,17 @@ static bool ShouldShiftByMenubarHeightInFullscreen(nsCocoaWindow* aWindow) {
       // Drop all mouse events if a modal window has appeared above us.
       // This helps make us behave as if the OS were running a "real" modal
       // event loop.
-      id delegate = [self delegate];
+      id delegate = self.delegate;
       if (delegate && [delegate isKindOfClass:[WindowDelegate class]]) {
         nsCocoaWindow* widget = [(WindowDelegate*)delegate geckoWidget];
         if (widget) {
           if (gGeckoAppModalWindowList &&
-              (widget != gGeckoAppModalWindowList->window))
+              widget != gGeckoAppModalWindowList->window) {
+            return;
+          }
+          if (widget->HasModalDescendents()) {
             return;
-          if (widget->HasModalDescendents()) return;
+          }
         }
       }
       break;
@@ -4410,14 +4420,17 @@ static const NSUInteger kWindowShadowOptionsTooltip = 4;
       // Drop all mouse events if a modal window has appeared above us.
       // This helps make us behave as if the OS were running a "real" modal
       // event loop.
-      id delegate = [self delegate];
+      id delegate = self.delegate;
       if (delegate && [delegate isKindOfClass:[WindowDelegate class]]) {
         nsCocoaWindow* widget = [(WindowDelegate*)delegate geckoWidget];
         if (widget) {
           if (gGeckoAppModalWindowList &&
-              (widget != gGeckoAppModalWindowList->window))
+              widget != gGeckoAppModalWindowList->window) {
             return;
-          if (widget->HasModalDescendents()) return;
+          }
+          if (widget->HasModalDescendents()) {
+            return;
+          }
         }
       }
       break;
@@ -4436,8 +4449,7 @@ static const NSUInteger kWindowShadowOptionsTooltip = 4;
 - (BOOL)canBecomeMainWindow {
   NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
 
-  if (![self isVisible]) return NO;
-  return YES;
+  return self.isVisible;
 
   NS_OBJC_END_TRY_BLOCK_RETURN(NO);
 }
diff --git a/widget/cocoa/nsCursorManager.mm b/widget/cocoa/nsCursorManager.mm
index 2db20681ad..11a37f59b7 100644
--- a/widget/cocoa/nsCursorManager.mm
+++ b/widget/cocoa/nsCursorManager.mm
@@ -304,19 +304,17 @@ static constexpr nsCursor kCustomCursor = eCursorCount;
     return NS_ERROR_FAILURE;
   }
 
+  const NSSize cocoaSize = NSMakeSize(size.width, size.height);
   NSImage* cursorImage;
   nsresult rv = nsCocoaUtils::CreateNSImageFromImageContainer(
       aCursor.mContainer, imgIContainer::FRAME_FIRST, nullptr, nullptr,
-      &cursorImage, scaleFactor);
+      cocoaSize, &cursorImage, scaleFactor);
   if (NS_FAILED(rv) || !cursorImage) {
     return NS_ERROR_FAILURE;
   }
 
-  {
-    NSSize cocoaSize = NSMakeSize(size.width, size.height);
-    [cursorImage setSize:cocoaSize];
-    [[[cursorImage representations] objectAtIndex:0] setSize:cocoaSize];
-  }
+  [cursorImage setSize:cocoaSize];
+  [[[cursorImage representations] objectAtIndex:0] setSize:cocoaSize];
 
   // if the hotspot is nonsensical, make it 0,0
   uint32_t hotspotX =
diff --git a/widget/cocoa/nsLookAndFeel.mm b/widget/cocoa/nsLookAndFeel.mm
index 73fd6b689c..5675198ff2 100644
--- a/widget/cocoa/nsLookAndFeel.mm
+++ b/widget/cocoa/nsLookAndFeel.mm
@@ -366,9 +366,6 @@ nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
     case IntID::SubmenuDelay:
       aResult = 200;
       break;
-    case IntID::TooltipDelay:
-      aResult = 500;
-      break;
     case IntID::MenusCanOverlapOSBar:
       // xul popups are not allowed to overlap the menubar.
       aResult = 0;
diff --git a/widget/cocoa/nsMacSharingService.mm b/widget/cocoa/nsMacSharingService.mm
index 694617ba65..c8509af00f 100644
--- a/widget/cocoa/nsMacSharingService.mm
+++ b/widget/cocoa/nsMacSharingService.mm
@@ -98,7 +98,7 @@ static NSString* NSImageToBase64(const NSImage* aImage) {
 static void SetStrAttribute(JSContext* aCx, JS::Rooted<JSObject*>& aObj,
                             const char* aKey, NSString* aVal) {
   nsAutoString strVal;
-  mozilla::CopyCocoaStringToXPCOMString(aVal, strVal);
+  mozilla::CopyNSStringToXPCOMString(aVal, strVal);
   JS::Rooted<JSString*> title(aCx, JS_NewUCStringCopyZ(aCx, strVal.get()));
   JS::Rooted<JS::Value> attVal(aCx, JS::StringValue(title));
   JS_SetProperty(aCx, aObj, aKey, attVal);
diff --git a/widget/gtk/DBusMenu.cpp b/widget/gtk/DBusMenu.cpp
new file mode 100644
index 0000000000..8672de40ef
--- /dev/null
+++ b/widget/gtk/DBusMenu.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
+/* 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 "DBusMenu.h"
+#include "prlink.h"
+#include "nsThreadUtils.h"
+#include "mozilla/ArrayUtils.h"
+
+namespace mozilla::widget {
+
+#define FUNC(name, type, params) \
+  DBusMenuFunctions::_##name##_fn DBusMenuFunctions::s_##name;
+DBUSMENU_GLIB_FUNCTIONS
+DBUSMENU_GTK_FUNCTIONS
+#undef FUNC
+
+static PRLibrary* gDbusmenuGlib = nullptr;
+static PRLibrary* gDbusmenuGtk = nullptr;
+
+using DBusMenuFunc = void (*)();
+struct DBusMenuDynamicFunction {
+  const char* functionName;
+  DBusMenuFunc* function;
+};
+
+static bool sInitialized;
+static bool sLibPresent;
+
+/* static */ bool DBusMenuFunctions::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (sInitialized) {
+    return sLibPresent;
+  }
+  sInitialized = true;
+#define FUNC(name, type, params) \
+  {#name, (DBusMenuFunc*)&DBusMenuFunctions::s_##name},
+  static const DBusMenuDynamicFunction kDbusmenuGlibSymbols[] = {
+      DBUSMENU_GLIB_FUNCTIONS};
+  static const DBusMenuDynamicFunction kDbusmenuGtkSymbols[] = {
+      DBUSMENU_GTK_FUNCTIONS};
+
+#define LOAD_LIBRARY(symbol, name)                                            \
+  if (!g##symbol) {                                                           \
+    g##symbol = PR_LoadLibrary(name);                                         \
+    if (!g##symbol) {                                                         \
+      return false;                                                           \
+    }                                                                         \
+  }                                                                           \
+  for (uint32_t i = 0; i < mozilla::ArrayLength(k##symbol##Symbols); ++i) {   \
+    *k##symbol##Symbols[i].function =                                         \
+        PR_FindFunctionSymbol(g##symbol, k##symbol##Symbols[i].functionName); \
+    if (!*k##symbol##Symbols[i].function) {                                   \
+      return false;                                                           \
+    }                                                                         \
+  }
+
+  LOAD_LIBRARY(DbusmenuGlib, "libdbusmenu-glib.so.4")
+  LOAD_LIBRARY(DbusmenuGtk, "libdbusmenu-gtk3.so.4")
+#undef LOAD_LIBRARY
+
+  sLibPresent = true;
+  return true;
+}
+
+}  // namespace mozilla::widget
diff --git a/widget/gtk/DBusMenu.h b/widget/gtk/DBusMenu.h
new file mode 100644
index 0000000000..d288d02322
--- /dev/null
+++ b/widget/gtk/DBusMenu.h
@@ -0,0 +1,137 @@
+/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
+/* 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_widget_DBusMenu_h
+#define mozilla_widget_DBusMenu_h
+
+#include <glib.h>
+#include <gdk/gdk.h>
+
+namespace mozilla {
+
+namespace dom {
+class Element;
+}
+
+namespace widget {
+
+#define DBUSMENU_GLIB_FUNCTIONS                                              \
+  FUNC(dbusmenu_menuitem_child_add_position, gboolean,                       \
+       (DbusmenuMenuitem * mi, DbusmenuMenuitem * child, guint position))    \
+  FUNC(dbusmenu_menuitem_set_root, void,                                     \
+       (DbusmenuMenuitem * mi, gboolean root))                               \
+  FUNC(dbusmenu_menuitem_child_append, gboolean,                             \
+       (DbusmenuMenuitem * mi, DbusmenuMenuitem * child))                    \
+  FUNC(dbusmenu_menuitem_child_delete, gboolean,                             \
+       (DbusmenuMenuitem * mi, DbusmenuMenuitem * child))                    \
+  FUNC(dbusmenu_menuitem_get_children, GList*, (DbusmenuMenuitem * mi))      \
+  FUNC(dbusmenu_menuitem_new, DbusmenuMenuitem*, (void))                     \
+  FUNC(dbusmenu_menuitem_property_get, const gchar*,                         \
+       (DbusmenuMenuitem * mi, const gchar* property))                       \
+  FUNC(dbusmenu_menuitem_property_get_bool, gboolean,                        \
+       (DbusmenuMenuitem * mi, const gchar* property))                       \
+  FUNC(dbusmenu_menuitem_property_remove, void,                              \
+       (DbusmenuMenuitem * mi, const gchar* property))                       \
+  FUNC(dbusmenu_menuitem_property_set, gboolean,                             \
+       (DbusmenuMenuitem * mi, const gchar* property, const gchar* value))   \
+  FUNC(dbusmenu_menuitem_property_set_bool, gboolean,                        \
+       (DbusmenuMenuitem * mi, const gchar* property, const gboolean value)) \
+  FUNC(dbusmenu_menuitem_property_set_int, gboolean,                         \
+       (DbusmenuMenuitem * mi, const gchar* property, const gint value))     \
+  FUNC(dbusmenu_menuitem_show_to_user, void,                                 \
+       (DbusmenuMenuitem * mi, guint timestamp))                             \
+  FUNC(dbusmenu_menuitem_take_children, GList*, (DbusmenuMenuitem * mi))     \
+  FUNC(dbusmenu_server_new, DbusmenuServer*, (const gchar* object))          \
+  FUNC(dbusmenu_server_set_root, void,                                       \
+       (DbusmenuServer * server, DbusmenuMenuitem * root))                   \
+  FUNC(dbusmenu_server_set_status, void,                                     \
+       (DbusmenuServer * server, DbusmenuStatus status))
+
+#define DBUSMENU_GTK_FUNCTIONS                              \
+  FUNC(dbusmenu_menuitem_property_set_image, gboolean,      \
+       (DbusmenuMenuitem * menuitem, const gchar* property, \
+        const GdkPixbuf* data))                             \
+  FUNC(dbusmenu_menuitem_property_set_shortcut, gboolean,   \
+       (DbusmenuMenuitem * menuitem, guint key, GdkModifierType modifier))
+
+typedef struct _DbusmenuMenuitem DbusmenuMenuitem;
+typedef struct _DbusmenuServer DbusmenuServer;
+
+enum DbusmenuStatus { DBUSMENU_STATUS_NORMAL, DBUSMENU_STATUS_NOTICE };
+
+#define DBUSMENU_MENUITEM_CHILD_DISPLAY_SUBMENU "submenu"
+#define DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY "children-display"
+#define DBUSMENU_MENUITEM_PROP_ENABLED "enabled"
+#define DBUSMENU_MENUITEM_PROP_ICON_DATA "icon-data"
+#define DBUSMENU_MENUITEM_PROP_LABEL "label"
+#define DBUSMENU_MENUITEM_PROP_SHORTCUT "shortcut"
+#define DBUSMENU_MENUITEM_PROP_TYPE "type"
+#define DBUSMENU_MENUITEM_PROP_TOGGLE_STATE "toggle-state"
+#define DBUSMENU_MENUITEM_PROP_TOGGLE_TYPE "toggle-type"
+#define DBUSMENU_MENUITEM_PROP_VISIBLE "visible"
+#define DBUSMENU_MENUITEM_SIGNAL_ABOUT_TO_SHOW "about-to-show"
+#define DBUSMENU_MENUITEM_SIGNAL_EVENT "event"
+#define DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED "item-activated"
+#define DBUSMENU_MENUITEM_TOGGLE_CHECK "checkmark"
+#define DBUSMENU_MENUITEM_TOGGLE_RADIO "radio"
+#define DBUSMENU_MENUITEM_TOGGLE_STATE_CHECKED 1
+#define DBUSMENU_MENUITEM_TOGGLE_STATE_UNCHECKED 0
+#define DBUSMENU_SERVER_PROP_DBUS_OBJECT "dbus-object"
+
+class DBusMenuFunctions {
+ public:
+  DBusMenuFunctions() = delete;
+
+  static bool Init();
+
+#define FUNC(name, type, params)      \
+  typedef type(*_##name##_fn) params; \
+  static _##name##_fn s_##name;
+  DBUSMENU_GLIB_FUNCTIONS
+  DBUSMENU_GTK_FUNCTIONS
+#undef FUNC
+};
+
+#define dbusmenu_menuitem_set_root \
+  DBusMenuFunctions::s_dbusmenu_menuitem_set_root
+#define dbusmenu_menuitem_child_add_position \
+  DBusMenuFunctions::s_dbusmenu_menuitem_child_add_position
+#define dbusmenu_menuitem_child_append \
+  DBusMenuFunctions::s_dbusmenu_menuitem_child_append
+#define dbusmenu_menuitem_child_delete \
+  DBusMenuFunctions::s_dbusmenu_menuitem_child_delete
+#define dbusmenu_menuitem_get_children \
+  DBusMenuFunctions::s_dbusmenu_menuitem_get_children
+#define dbusmenu_menuitem_new DBusMenuFunctions::s_dbusmenu_menuitem_new
+#define dbusmenu_menuitem_property_get \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_get
+#define dbusmenu_menuitem_property_get_bool \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_get_bool
+#define dbusmenu_menuitem_property_remove \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_remove
+#define dbusmenu_menuitem_property_set \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_set
+#define dbusmenu_menuitem_property_set_bool \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_set_bool
+#define dbusmenu_menuitem_property_set_int \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_set_int
+#define dbusmenu_menuitem_show_to_user \
+  DBusMenuFunctions::s_dbusmenu_menuitem_show_to_user
+#define dbusmenu_menuitem_take_children \
+  DBusMenuFunctions::s_dbusmenu_menuitem_take_children
+#define dbusmenu_server_new DBusMenuFunctions::s_dbusmenu_server_new
+#define dbusmenu_server_set_root DBusMenuFunctions::s_dbusmenu_server_set_root
+#define dbusmenu_server_set_status \
+  DBusMenuFunctions::s_dbusmenu_server_set_status
+
+#define dbusmenu_menuitem_property_set_image \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_set_image
+#define dbusmenu_menuitem_property_set_shortcut \
+  DBusMenuFunctions::s_dbusmenu_menuitem_property_set_shortcut
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif
diff --git a/widget/gtk/GRefPtr.h b/widget/gtk/GRefPtr.h
index 1970008811..071164c06f 100644
--- a/widget/gtk/GRefPtr.h
+++ b/widget/gtk/GRefPtr.h
@@ -13,6 +13,9 @@
 #include <gtk/gtk.h>
 #include "mozilla/RefPtr.h"
 
+typedef struct _DbusmenuMenuitem DbusmenuMenuitem;
+typedef struct _DbusmenuServer DbusmenuServer;
+
 namespace mozilla {
 
 template <typename T>
@@ -25,6 +28,8 @@ struct GObjectRefPtrTraits {
   template <>                 \
   struct RefPtrTraits<type_> : public GObjectRefPtrTraits<type_> {};
 
+GOBJECT_TRAITS(DbusmenuMenuitem)
+GOBJECT_TRAITS(DbusmenuServer)
 GOBJECT_TRAITS(GtkWidget)
 GOBJECT_TRAITS(GFile)
 GOBJECT_TRAITS(GFileMonitor)
diff --git a/widget/gtk/GfxInfo.cpp b/widget/gtk/GfxInfo.cpp
index 4dadbc81b5..457b2c72ce 100644
--- a/widget/gtk/GfxInfo.cpp
+++ b/widget/gtk/GfxInfo.cpp
@@ -75,17 +75,17 @@ nsresult GfxInfo::Init() {
 }
 
 void GfxInfo::AddCrashReportAnnotations() {
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterVendorID,
-                                     mVendorId);
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterDeviceID,
-                                     mDeviceId);
-  CrashReporter::AnnotateCrashReport(
+  CrashReporter::RecordAnnotationNSCString(
+      CrashReporter::Annotation::AdapterVendorID, mVendorId);
+  CrashReporter::RecordAnnotationNSCString(
+      CrashReporter::Annotation::AdapterDeviceID, mDeviceId);
+  CrashReporter::RecordAnnotationNSCString(
       CrashReporter::Annotation::AdapterDriverVendor, mDriverVendor);
-  CrashReporter::AnnotateCrashReport(
+  CrashReporter::RecordAnnotationNSCString(
       CrashReporter::Annotation::AdapterDriverVersion, mDriverVersion);
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::IsWayland,
-                                     mIsWayland);
-  CrashReporter::AnnotateCrashReport(
+  CrashReporter::RecordAnnotationBool(CrashReporter::Annotation::IsWayland,
+                                      mIsWayland);
+  CrashReporter::RecordAnnotationNSCString(
       CrashReporter::Annotation::DesktopEnvironment,
       GetDesktopEnvironmentIdentifier());
 
diff --git a/widget/gtk/GtkCompositorWidget.cpp b/widget/gtk/GtkCompositorWidget.cpp
index a3443b9828..36559cfd54 100644
--- a/widget/gtk/GtkCompositorWidget.cpp
+++ b/widget/gtk/GtkCompositorWidget.cpp
@@ -39,11 +39,11 @@ GtkCompositorWidget::GtkCompositorWidget(
                   "GtkCompositorWidget::mClientSize") {
 #if defined(MOZ_X11)
   if (GdkIsX11Display()) {
-    mXWindow = (Window)aInitData.XWindow();
-    ConfigureX11Backend(mXWindow, aInitData.Shaped());
+    ConfigureX11Backend((Window)aInitData.XWindow(), aInitData.Shaped());
     LOG("GtkCompositorWidget::GtkCompositorWidget() [%p] mXWindow %p "
         "mIsRenderingSuspended %d\n",
-        (void*)mWidget.get(), (void*)mXWindow, !!mIsRenderingSuspended);
+        (void*)mWidget.get(), (void*)aInitData.XWindow(),
+        !!mIsRenderingSuspended);
   }
 #endif
 #if defined(MOZ_WAYLAND)
@@ -123,8 +123,8 @@ EGLNativeWindowType GtkCompositorWidget::GetEGLNativeWindow() {
     window = (EGLNativeWindowType)mWidget->GetNativeData(NS_NATIVE_EGL_WINDOW);
   }
 #if defined(MOZ_X11)
-  if (mXWindow) {
-    window = (EGLNativeWindowType)mXWindow;
+  else {
+    window = (EGLNativeWindowType)mProvider.GetXWindow();
   }
 #endif
   LOG("GtkCompositorWidget::GetEGLNativeWindow [%p] window %p\n", mWidget.get(),
@@ -173,9 +173,6 @@ void GtkCompositorWidget::DisableRendering() {
   LOG("GtkCompositorWidget::DisableRendering [%p]\n", (void*)mWidget.get());
   mIsRenderingSuspended = true;
   mProvider.CleanupResources();
-#if defined(MOZ_X11)
-  mXWindow = {};
-#endif
 }
 
 #if defined(MOZ_WAYLAND)
@@ -187,27 +184,13 @@ bool GtkCompositorWidget::ConfigureWaylandBackend() {
 
 #if defined(MOZ_X11)
 bool GtkCompositorWidget::ConfigureX11Backend(Window aXWindow, bool aShaped) {
-  mXWindow = aXWindow;
-
   // We don't have X window yet.
-  if (!mXWindow) {
+  if (!aXWindow) {
     mIsRenderingSuspended = true;
     return false;
   }
-
-  // Grab the window's visual and depth
-  XWindowAttributes windowAttrs;
-  if (!XGetWindowAttributes(DefaultXDisplay(), mXWindow, &windowAttrs)) {
-    NS_WARNING("GtkCompositorWidget(): XGetWindowAttributes() failed!");
-    return false;
-  }
-
-  Visual* visual = windowAttrs.visual;
-  int depth = windowAttrs.depth;
-
   // Initialize the window surface provider
-  mProvider.Initialize(mXWindow, visual, depth, aShaped);
-  return true;
+  return mProvider.Initialize(aXWindow, aShaped);
 }
 #endif
 
diff --git a/widget/gtk/GtkCompositorWidget.h b/widget/gtk/GtkCompositorWidget.h
index 5bf89835d7..bde88bde6c 100644
--- a/widget/gtk/GtkCompositorWidget.h
+++ b/widget/gtk/GtkCompositorWidget.h
@@ -84,7 +84,7 @@ class GtkCompositorWidget : public CompositorWidget,
   bool SetEGLNativeWindowSize(const LayoutDeviceIntSize& aEGLWindowSize);
 
 #if defined(MOZ_X11)
-  Window XWindow() const { return mXWindow; }
+  Window XWindow() const { return mProvider.GetXWindow(); }
 #endif
 #if defined(MOZ_WAYLAND)
   RefPtr<mozilla::layers::NativeLayerRoot> GetNativeLayerRoot() override;
@@ -123,11 +123,9 @@ class GtkCompositorWidget : public CompositorWidget,
   // of the two.
   DataMutex<LayoutDeviceIntSize> mClientSize;
 
+  // Holds rendering resources
   WindowSurfaceProvider mProvider;
 
-#if defined(MOZ_X11)
-  Window mXWindow = {};
-#endif
 #ifdef MOZ_WAYLAND
   RefPtr<mozilla::layers::NativeLayerRootWayland> mNativeLayerRoot;
 #endif
diff --git a/widget/gtk/IMContextWrapper.cpp b/widget/gtk/IMContextWrapper.cpp
index fc87acbf86..2e438bbc5c 100644
--- a/widget/gtk/IMContextWrapper.cpp
+++ b/widget/gtk/IMContextWrapper.cpp
@@ -232,11 +232,18 @@ class SelectionStyleProvider final {
     sHasShutDown = true;
   }
 
-  // mContainer associated with an IM context.
-  void AttachTo(MozContainer* aContainer) {
-    gtk_style_context_add_provider(
-        gtk_widget_get_style_context(GTK_WIDGET(aContainer)),
-        GTK_STYLE_PROVIDER(mProvider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+  // aGDKWindow is a GTK window which will be associated with an IM context.
+  void AttachTo(GdkWindow* aGDKWindow) {
+    GtkWidget* widget = nullptr;
+    // gdk_window_get_user_data() typically returns pointer to widget that
+    // window belongs to.  If it's widget, fcitx retrieves selection colors
+    // of them.  So, we need to overwrite its style.
+    gdk_window_get_user_data(aGDKWindow, (gpointer*)&widget);
+    if (GTK_IS_WIDGET(widget)) {
+      gtk_style_context_add_provider(gtk_widget_get_style_context(widget),
+                                     GTK_STYLE_PROVIDER(mProvider),
+                                     GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+    }
   }
 
   void OnThemeChanged() {
@@ -410,17 +417,21 @@ nsDependentCSubstring IMContextWrapper::GetIMName() const {
 }
 
 void IMContextWrapper::Init() {
+  MozContainer* container = mOwnerWindow->GetMozContainer();
+  MOZ_ASSERT(container, "container is null");
+  GdkWindow* gdkWindow = gtk_widget_get_window(GTK_WIDGET(container));
+
   // Overwrite selection colors of the window before associating the window
   // with IM context since IME may look up selection colors via IM context
   // to support any colored widgets.
-  SelectionStyleProvider::GetInstance()->AttachTo(
-      mOwnerWindow->GetMozContainer());
+  SelectionStyleProvider::GetInstance()->AttachTo(gdkWindow);
 
   // NOTE: gtk_im_*_new() abort (kill) the whole process when it fails.
   //       So, we don't need to check the result.
 
   // Normal context.
   mContext = gtk_im_multicontext_new();
+  gtk_im_context_set_client_window(mContext, gdkWindow);
   g_signal_connect(mContext, "preedit_changed",
                    G_CALLBACK(IMContextWrapper::OnChangeCompositionCallback),
                    this);
@@ -492,6 +503,7 @@ void IMContextWrapper::Init() {
   // Simple context
   if (sUseSimpleContext) {
     mSimpleContext = gtk_im_context_simple_new();
+    gtk_im_context_set_client_window(mSimpleContext, gdkWindow);
     g_signal_connect(mSimpleContext, "preedit_changed",
                      G_CALLBACK(&IMContextWrapper::OnChangeCompositionCallback),
                      this);
@@ -514,6 +526,7 @@ void IMContextWrapper::Init() {
 
   // Dummy context
   mDummyContext = gtk_im_multicontext_new();
+  gtk_im_context_set_client_window(mDummyContext, gdkWindow);
 
   MOZ_LOG(gIMELog, LogLevel::Info,
           ("0x%p Init(), mOwnerWindow=%p, mContext=%p (im=\"%s\"), "
@@ -540,17 +553,6 @@ IMContextWrapper::~IMContextWrapper() {
   MOZ_LOG(gIMELog, LogLevel::Info, ("0x%p ~IMContextWrapper()", this));
 }
 
-void IMContextWrapper::SetGdkWindow(GdkWindow* aGdkWindow) {
-  MOZ_LOG(gIMELog, LogLevel::Info,
-          ("0x%p GdkWindowChanged(%p)", this, aGdkWindow));
-  MOZ_ASSERT(!aGdkWindow || mOwnerWindow->GetGdkWindow() == aGdkWindow);
-  gtk_im_context_set_client_window(mContext, aGdkWindow);
-  if (mSimpleContext) {
-    gtk_im_context_set_client_window(mSimpleContext, aGdkWindow);
-  }
-  gtk_im_context_set_client_window(mDummyContext, aGdkWindow);
-}
-
 NS_IMETHODIMP
 IMContextWrapper::NotifyIME(TextEventDispatcher* aTextEventDispatcher,
                             const IMENotification& aNotification) {
diff --git a/widget/gtk/IMContextWrapper.h b/widget/gtk/IMContextWrapper.h
index 213c5ce8d3..cf1d2638e0 100644
--- a/widget/gtk/IMContextWrapper.h
+++ b/widget/gtk/IMContextWrapper.h
@@ -117,10 +117,6 @@ class IMContextWrapper final : public TextEventDispatcherListener {
   void OnUpdateComposition();
   void OnLayoutChange();
 
-  // Set GdkWindow associated with IM context.
-  // It can be null which disables context operations.
-  void SetGdkWindow(GdkWindow* aGdkWindow);
-
   TextEventDispatcher* GetTextEventDispatcher();
 
   // TODO: Typically, new IM comes every several years.  And now, our code
diff --git a/widget/gtk/MozContainer.cpp b/widget/gtk/MozContainer.cpp
index 95d32b57b4..775ae0488f 100644
--- a/widget/gtk/MozContainer.cpp
+++ b/widget/gtk/MozContainer.cpp
@@ -35,27 +35,6 @@ static void moz_container_size_allocate(GtkWidget* widget,
 static void moz_container_realize(GtkWidget* widget);
 static void moz_container_unrealize(GtkWidget* widget);
 
-/* container class methods */
-static void moz_container_remove(GtkContainer* container,
-                                 GtkWidget* child_widget);
-static void moz_container_forall(GtkContainer* container,
-                                 gboolean include_internals,
-                                 GtkCallback callback, gpointer callback_data);
-static void moz_container_add(GtkContainer* container, GtkWidget* widget);
-
-typedef struct _MozContainerChild MozContainerChild;
-
-struct _MozContainerChild {
-  GtkWidget* widget;
-  gint x;
-  gint y;
-};
-
-static void moz_container_allocate_child(MozContainer* container,
-                                         MozContainerChild* child);
-static MozContainerChild* moz_container_get_child(MozContainer* container,
-                                                  GtkWidget* child);
-
 /* public methods */
 
 GType moz_container_get_type(void) {
@@ -92,26 +71,6 @@ GtkWidget* moz_container_new(void) {
   return GTK_WIDGET(container);
 }
 
-void moz_container_put(MozContainer* container, GtkWidget* child_widget, gint x,
-                       gint y) {
-  MozContainerChild* child;
-
-  child = g_new(MozContainerChild, 1);
-
-  child->widget = child_widget;
-  child->x = x;
-  child->y = y;
-
-  /*  printf("moz_container_put %p %p %d %d\n", (void *)container,
-      (void *)child_widget, x, y); */
-
-  container->data.children = g_list_append(container->data.children, child);
-
-  /* we assume that the caller of this function will have already set
-     the parent GdkWindow because we can have many anonymous children. */
-  gtk_widget_set_parent(child_widget, GTK_WIDGET(container));
-}
-
 static void moz_container_destroy(GtkWidget* widget) {
   auto* container = MOZ_CONTAINER(widget);
   if (container->destroyed) {
@@ -126,7 +85,6 @@ static void moz_container_destroy(GtkWidget* widget) {
 void moz_container_class_init(MozContainerClass* klass) {
   /*GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
     GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass); */
-  GtkContainerClass* container_class = GTK_CONTAINER_CLASS(klass);
   GtkWidgetClass* widget_class = GTK_WIDGET_CLASS(klass);
 
   widget_class->realize = moz_container_realize;
@@ -147,10 +105,6 @@ void moz_container_class_init(MozContainerClass* klass) {
 #ifdef MOZ_WAYLAND
   }
 #endif
-
-  container_class->remove = moz_container_remove;
-  container_class->forall = moz_container_forall;
-  container_class->add = moz_container_add;
 }
 
 void moz_container_init(MozContainer* container) {
@@ -164,8 +118,6 @@ void moz_container_init(MozContainer* container) {
 
 void moz_container_map(GtkWidget* widget) {
   MozContainer* container;
-  GList* tmp_list;
-  GtkWidget* tmp_child;
 
   g_return_if_fail(IS_MOZ_CONTAINER(widget));
   container = MOZ_CONTAINER(widget);
@@ -175,16 +127,6 @@ void moz_container_map(GtkWidget* widget) {
 
   gtk_widget_set_mapped(widget, TRUE);
 
-  tmp_list = container->data.children;
-  while (tmp_list) {
-    tmp_child = ((MozContainerChild*)tmp_list->data)->widget;
-
-    if (gtk_widget_get_visible(tmp_child)) {
-      if (!gtk_widget_get_mapped(tmp_child)) gtk_widget_map(tmp_child);
-    }
-    tmp_list = tmp_list->next;
-  }
-
   if (gtk_widget_get_has_window(widget)) {
     gdk_window_show(gtk_widget_get_window(widget));
   }
@@ -257,8 +199,6 @@ void moz_container_unrealize(GtkWidget* widget) {
 }
 
 void moz_container_size_allocate(GtkWidget* widget, GtkAllocation* allocation) {
-  MozContainer* container;
-  GList* tmp_list;
   GtkAllocation tmp_allocation;
 
   g_return_if_fail(IS_MOZ_CONTAINER(widget));
@@ -269,10 +209,8 @@ void moz_container_size_allocate(GtkWidget* widget, GtkAllocation* allocation) {
                 allocation->height));
 
   /* short circuit if you can */
-  container = MOZ_CONTAINER(widget);
   gtk_widget_get_allocation(widget, &tmp_allocation);
-  if (!container->data.children && tmp_allocation.x == allocation->x &&
-      tmp_allocation.y == allocation->y &&
+  if (tmp_allocation.x == allocation->x && tmp_allocation.y == allocation->y &&
       tmp_allocation.width == allocation->width &&
       tmp_allocation.height == allocation->height) {
     return;
@@ -280,16 +218,6 @@ void moz_container_size_allocate(GtkWidget* widget, GtkAllocation* allocation) {
 
   gtk_widget_set_allocation(widget, allocation);
 
-  tmp_list = container->data.children;
-
-  while (tmp_list) {
-    MozContainerChild* child = static_cast<MozContainerChild*>(tmp_list->data);
-
-    moz_container_allocate_child(container, child);
-
-    tmp_list = tmp_list->next;
-  }
-
   if (gtk_widget_get_has_window(widget) && gtk_widget_get_realized(widget)) {
     gdk_window_move_resize(gtk_widget_get_window(widget), allocation->x,
                            allocation->y, allocation->width,
@@ -297,99 +225,6 @@ void moz_container_size_allocate(GtkWidget* widget, GtkAllocation* allocation) {
   }
 }
 
-void moz_container_remove(GtkContainer* container, GtkWidget* child_widget) {
-  MozContainerChild* child;
-  MozContainer* moz_container;
-  GdkWindow* parent_window;
-
-  g_return_if_fail(IS_MOZ_CONTAINER(container));
-  g_return_if_fail(GTK_IS_WIDGET(child_widget));
-
-  moz_container = MOZ_CONTAINER(container);
-
-  child = moz_container_get_child(moz_container, child_widget);
-  g_return_if_fail(child);
-
-  /* gtk_widget_unparent will remove the parent window (as well as the
-   * parent widget), but, in Mozilla's window hierarchy, the parent window
-   * may need to be kept because it may be part of a GdkWindow sub-hierarchy
-   * that is being moved to another MozContainer.
-   *
-   * (In a conventional GtkWidget hierarchy, GdkWindows being reparented
-   * would have their own GtkWidget and that widget would be the one being
-   * reparented.  In Mozilla's hierarchy, the parent_window needs to be
-   * retained so that the GdkWindow sub-hierarchy is maintained.)
-   */
-  parent_window = gtk_widget_get_parent_window(child_widget);
-  if (parent_window) g_object_ref(parent_window);
-
-  gtk_widget_unparent(child_widget);
-
-  if (parent_window) {
-    /* The child_widget will always still exist because g_signal_emit,
-     * which invokes this function, holds a reference.
-     *
-     * If parent_window is the container's root window then it will not be
-     * the parent_window if the child_widget is placed in another
-     * container.
-     */
-    if (parent_window != gtk_widget_get_window(GTK_WIDGET(container))) {
-      gtk_widget_set_parent_window(child_widget, parent_window);
-    }
-
-    g_object_unref(parent_window);
-  }
-
-  moz_container->data.children =
-      g_list_remove(moz_container->data.children, child);
-  g_free(child);
-}
-
-void moz_container_forall(GtkContainer* container, gboolean include_internals,
-                          GtkCallback callback, gpointer callback_data) {
-  g_return_if_fail(IS_MOZ_CONTAINER(container));
-  g_return_if_fail(callback);
-
-  MozContainer* moz_container = MOZ_CONTAINER(container);
-
-  GList* tmp_list = moz_container->data.children;
-  while (tmp_list) {
-    MozContainerChild* child;
-    child = static_cast<MozContainerChild*>(tmp_list->data);
-    tmp_list = tmp_list->next;
-    (*callback)(child->widget, callback_data);
-  }
-}
-
-static void moz_container_allocate_child(MozContainer* container,
-                                         MozContainerChild* child) {
-  GtkAllocation allocation;
-
-  gtk_widget_get_allocation(child->widget, &allocation);
-  allocation.x = child->x;
-  allocation.y = child->y;
-
-  gtk_widget_size_allocate(child->widget, &allocation);
-}
-
-MozContainerChild* moz_container_get_child(MozContainer* container,
-                                           GtkWidget* child_widget) {
-  GList* tmp_list = container->data.children;
-  while (tmp_list) {
-    MozContainerChild* child;
-
-    child = static_cast<MozContainerChild*>(tmp_list->data);
-    tmp_list = tmp_list->next;
-
-    if (child->widget == child_widget) return child;
-  }
-  return nullptr;
-}
-
-static void moz_container_add(GtkContainer* container, GtkWidget* widget) {
-  moz_container_put(MOZ_CONTAINER(container), widget, 0, 0);
-}
-
 void moz_container_force_default_visual(MozContainer* container) {
   container->data.force_default_visual = true;
 }
diff --git a/widget/gtk/MozContainer.h b/widget/gtk/MozContainer.h
index 27fa2a701f..e6f9b4e992 100644
--- a/widget/gtk/MozContainer.h
+++ b/widget/gtk/MozContainer.h
@@ -18,35 +18,12 @@
 /*
  * MozContainer
  *
- * This class serves three purposes in the nsIWidget implementation.
+ * This class serves two purposes in the nsIWidget implementation.
  *
  *   - It provides objects to receive signals from GTK for events on native
  *     windows.
  *
- *   - It provides GdkWindow to draw content on Wayland or when Gtk+ renders
- *     client side decorations to mShell.
- *
- *   - It provides a container parent for GtkWidgets.  The only GtkWidgets
- *     that need this in Mozilla are the GtkSockets for windowed plugins (Xt
- *     and XEmbed).
- *
- * Note that the window hierarchy in Mozilla differs from conventional
- * GtkWidget hierarchies.
- *
- * Mozilla's hierarchy exists through the GdkWindow hierarchy, and all child
- * GdkWindows (within a child nsIWidget hierarchy) belong to one MozContainer
- * GtkWidget.  If the MozContainer is unrealized or its GdkWindows are
- * destroyed for some other reason, then the hierarchy no longer exists.  (In
- * conventional GTK clients, the hierarchy is recorded by the GtkWidgets, and
- * so can be re-established after destruction of the GdkWindows.)
- *
- * One consequence of this is that the MozContainer does not know which of its
- * GdkWindows should parent child GtkWidgets.  (Conventional GtkContainers
- * determine which GdkWindow to assign child GtkWidgets.)
- *
- * Therefore, when adding a child GtkWidget to a MozContainer,
- * gtk_widget_set_parent_window should be called on the child GtkWidget before
- * it is realized.
+ *   - It provides GdkWindow to draw content.
  */
 
 #define MOZ_CONTAINER_TYPE (moz_container_get_type())
@@ -71,7 +48,6 @@ struct _MozContainer {
   GtkContainer container;
   gboolean destroyed;
   struct Data {
-    GList* children = nullptr;
     gboolean force_default_visual = false;
 #ifdef MOZ_WAYLAND
     MozContainerWayland wl_container;
diff --git a/widget/gtk/MozContainerWayland.cpp b/widget/gtk/MozContainerWayland.cpp
index 0e50a3f27c..8490f25599 100644
--- a/widget/gtk/MozContainerWayland.cpp
+++ b/widget/gtk/MozContainerWayland.cpp
@@ -436,7 +436,6 @@ void moz_container_wayland_map(GtkWidget* widget) {
 
 void moz_container_wayland_size_allocate(GtkWidget* widget,
                                          GtkAllocation* allocation) {
-  MozContainer* container;
   GtkAllocation tmp_allocation;
 
   g_return_if_fail(IS_MOZ_CONTAINER(widget));
@@ -447,10 +446,8 @@ void moz_container_wayland_size_allocate(GtkWidget* widget,
                allocation->height);
 
   /* short circuit if you can */
-  container = MOZ_CONTAINER(widget);
   gtk_widget_get_allocation(widget, &tmp_allocation);
-  if (!container->data.children && tmp_allocation.x == allocation->x &&
-      tmp_allocation.y == allocation->y &&
+  if (tmp_allocation.x == allocation->x && tmp_allocation.y == allocation->y &&
       tmp_allocation.width == allocation->width &&
       tmp_allocation.height == allocation->height) {
     return;
@@ -464,6 +461,7 @@ void moz_container_wayland_size_allocate(GtkWidget* widget,
     // We need to position our subsurface according to GdkWindow
     // when offset changes (GdkWindow is maximized for instance).
     // see gtk-clutter-embed.c for reference.
+    MozContainer* container = MOZ_CONTAINER(widget);
     MutexAutoLock lock(container->data.wl_container.container_lock);
     if (!container->data.wl_container.surface) {
       if (!moz_container_wayland_surface_create_locked(lock, container)) {
diff --git a/widget/gtk/NativeMenuGtk.cpp b/widget/gtk/NativeMenuGtk.cpp
index 9d413d475e..3f8aeb1940 100644
--- a/widget/gtk/NativeMenuGtk.cpp
+++ b/widget/gtk/NativeMenuGtk.cpp
@@ -4,6 +4,9 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "NativeMenuGtk.h"
+#include "AsyncDBus.h"
+#include "gdk/gdkkeysyms-compat.h"
+#include "mozilla/BasicEvents.h"
 #include "mozilla/dom/Document.h"
 #include "mozilla/dom/DocumentInlines.h"
 #include "mozilla/dom/XULCommandEvent.h"
@@ -15,6 +18,10 @@
 #include "nsStubMutationObserver.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/StaticPrefs_widget.h"
+#include "DBusMenu.h"
+#include "nsLayoutUtils.h"
+#include "nsGtkUtils.h"
+#include "nsGtkKeyUtils.h"
 
 #include <dlfcn.h>
 #include <gtk/gtk.h>
@@ -35,7 +42,8 @@ static bool IsDisabled(const dom::Element& aElement) {
 }
 static bool NodeIsRelevant(const nsINode& aNode) {
   return aNode.IsAnyOfXULElements(nsGkAtoms::menu, nsGkAtoms::menuseparator,
-                                  nsGkAtoms::menuitem, nsGkAtoms::menugroup);
+                                  nsGkAtoms::menuitem, nsGkAtoms::menugroup,
+                                  nsGkAtoms::menubar);
 }
 
 // If this is a radio / checkbox menuitem, get the current value.
@@ -155,7 +163,7 @@ void Actions::Clear() {
   mNextActionIndex = 0;
 }
 
-class MenuModel final : public nsStubMutationObserver {
+class MenuModel : public nsStubMutationObserver {
   NS_DECL_ISUPPORTS
 
   NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
@@ -166,41 +174,60 @@ class MenuModel final : public nsStubMutationObserver {
  public:
   explicit MenuModel(dom::Element* aElement) : mElement(aElement) {
     mElement->AddMutationObserver(this);
-    mGMenu = dont_AddRef(g_menu_new());
-    mActions.mGroup = dont_AddRef(g_simple_action_group_new());
-  }
-
-  GMenuModel* GetModel() { return G_MENU_MODEL(mGMenu.get()); }
-  GActionGroup* GetActionGroup() {
-    return G_ACTION_GROUP(mActions.mGroup.get());
   }
 
   dom::Element* Element() { return mElement; }
 
-  void RecomputeModelIfNeeded();
+  void RecomputeModelIfNeeded() {
+    if (!mDirty) {
+      return;
+    }
+    RecomputeModel();
+    mDirty = false;
+  }
 
-  bool IsShowing() { return mPoppedUp; }
+  bool IsShowing() { return mShowing; }
   void WillShow() {
-    mPoppedUp = true;
+    mShowing = true;
     RecomputeModelIfNeeded();
   }
-  void DidHide() { mPoppedUp = false; }
+  void DidHide() { mShowing = false; }
 
- private:
+ protected:
+  virtual void RecomputeModel() = 0;
   virtual ~MenuModel() { mElement->RemoveMutationObserver(this); }
 
   void DirtyModel() {
     mDirty = true;
-    if (mPoppedUp) {
+    if (mShowing) {
       RecomputeModelIfNeeded();
     }
   }
 
   RefPtr<dom::Element> mElement;
+  bool mDirty = true;
+  bool mShowing = false;
+};
+
+class MenuModelGMenu final : public MenuModel {
+ public:
+  explicit MenuModelGMenu(dom::Element* aElement) : MenuModel(aElement) {
+    mGMenu = dont_AddRef(g_menu_new());
+    mActions.mGroup = dont_AddRef(g_simple_action_group_new());
+  }
+
+  GMenuModel* GetModel() { return G_MENU_MODEL(mGMenu.get()); }
+  GActionGroup* GetActionGroup() {
+    return G_ACTION_GROUP(mActions.mGroup.get());
+  }
+
+ protected:
+  void RecomputeModel() override;
+  static void RecomputeModelFor(GMenu* aMenu, Actions& aActions,
+                                const dom::Element& aElement);
+
   RefPtr<GMenu> mGMenu;
   Actions mActions;
-  bool mDirty = true;
-  bool mPoppedUp = false;
 };
 
 NS_IMPL_ISUPPORTS(MenuModel, nsIMutationObserver)
@@ -243,8 +270,8 @@ static const dom::Element* GetMenuPopupChild(const dom::Element& aElement) {
   return nullptr;
 }
 
-static void RecomputeModelFor(GMenu* aMenu, Actions& aActions,
-                              const dom::Element& aElement) {
+void MenuModelGMenu::RecomputeModelFor(GMenu* aMenu, Actions& aActions,
+                                       const dom::Element& aElement) {
   RefPtr<GMenu> sectionMenu;
   auto FlushSectionMenu = [&] {
     if (sectionMenu) {
@@ -305,10 +332,7 @@ static void RecomputeModelFor(GMenu* aMenu, Actions& aActions,
   FlushSectionMenu();
 }
 
-void MenuModel::RecomputeModelIfNeeded() {
-  if (!mDirty) {
-    return;
-  }
+void MenuModelGMenu::RecomputeModel() {
   mActions.Clear();
   g_menu_remove_all(mGMenu.get());
   RecomputeModelFor(mGMenu.get(), mActions, *mElement);
@@ -341,7 +365,7 @@ METHOD_SIGNAL(Unmap);
 #undef METHOD_SIGNAL
 
 NativeMenuGtk::NativeMenuGtk(dom::Element* aElement)
-    : mMenuModel(MakeRefPtr<MenuModel>(aElement)) {
+    : mMenuModel(MakeRefPtr<MenuModelGMenu>(aElement)) {
   // Floating, so no need to dont_AddRef.
   mNativeMenu = gtk_menu_new_from_model(mMenuModel->GetModel());
   gtk_widget_insert_action_group(mNativeMenu.get(), "menu",
@@ -421,4 +445,383 @@ void NativeMenuGtk::CloseSubmenu(dom::Element*) {
   // TODO: For testing mostly.
 }
 
+#ifdef MOZ_ENABLE_DBUS
+
+class MenubarModelDBus final : public MenuModel {
+ public:
+  explicit MenubarModelDBus(dom::Element* aElement) : MenuModel(aElement) {
+    mRoot = dont_AddRef(dbusmenu_menuitem_new());
+    dbusmenu_menuitem_set_root(mRoot.get(), true);
+    mShowing = true;
+  }
+
+  DbusmenuMenuitem* Root() const { return mRoot.get(); }
+
+ protected:
+  void RecomputeModel() override;
+  static void AppendMenuItem(DbusmenuMenuitem* aParent,
+                             const dom::Element* aElement);
+  static void AppendSeparator(DbusmenuMenuitem* aParent);
+  static void AppendSubmenu(DbusmenuMenuitem* aParent,
+                            const dom::Element* aMenu,
+                            const dom::Element* aPopup);
+  static uint RecomputeModelFor(DbusmenuMenuitem* aParent,
+                                const dom::Element& aElement);
+
+  RefPtr<DbusmenuMenuitem> mRoot;
+};
+
+void MenubarModelDBus::RecomputeModel() {
+  while (GList* children = dbusmenu_menuitem_get_children(mRoot.get())) {
+    auto* first = static_cast<DbusmenuMenuitem*>(children->data);
+    if (!first) {
+      break;
+    }
+    dbusmenu_menuitem_child_delete(mRoot.get(), first);
+  }
+  RecomputeModelFor(mRoot, *Element());
+}
+
+static const dom::Element* RelevantElementForKeys(
+    const dom::Element* aElement) {
+  nsAutoString key;
+  aElement->GetAttr(nsGkAtoms::key, key);
+  if (!key.IsEmpty()) {
+    dom::Document* document = aElement->OwnerDoc();
+    dom::Element* element = document->GetElementById(key);
+    if (element) {
+      return element;
+    }
+  }
+  return aElement;
+}
+
+static uint32_t ParseKey(const nsAString& aKey, const nsAString& aKeyCode) {
+  guint key = 0;
+  if (!aKey.IsEmpty()) {
+    key = gdk_unicode_to_keyval(*aKey.BeginReading());
+  }
+
+  if (key == 0 && !aKeyCode.IsEmpty()) {
+    key = KeymapWrapper::ConvertGeckoKeyCodeToGDKKeyval(aKeyCode);
+  }
+
+  return key;
+}
+
+static uint32_t KeyFrom(const dom::Element* aElement) {
+  const auto* element = RelevantElementForKeys(aElement);
+
+  nsAutoString key;
+  nsAutoString keycode;
+  element->GetAttr(nsGkAtoms::key, key);
+  element->GetAttr(nsGkAtoms::keycode, keycode);
+
+  return ParseKey(key, keycode);
+}
+
+// TODO(emilio): Unify with nsMenuUtilsX::GeckoModifiersForNodeAttribute (or
+// at least switch to strtok_r).
+static uint32_t ParseModifiers(const nsAString& aModifiers) {
+  if (aModifiers.IsEmpty()) {
+    return 0;
+  }
+
+  uint32_t modifier = 0;
+  char* str = ToNewUTF8String(aModifiers);
+  char* token = strtok(str, ", \t");
+  while (token) {
+    if (nsCRT::strcmp(token, "shift") == 0) {
+      modifier |= GDK_SHIFT_MASK;
+    } else if (nsCRT::strcmp(token, "alt") == 0) {
+      modifier |= GDK_MOD1_MASK;
+    } else if (nsCRT::strcmp(token, "meta") == 0) {
+      modifier |= GDK_META_MASK;
+    } else if (nsCRT::strcmp(token, "control") == 0) {
+      modifier |= GDK_CONTROL_MASK;
+    } else if (nsCRT::strcmp(token, "accel") == 0) {
+      auto accel = WidgetInputEvent::AccelModifier();
+      if (accel == MODIFIER_META) {
+        modifier |= GDK_META_MASK;
+      } else if (accel == MODIFIER_ALT) {
+        modifier |= GDK_MOD1_MASK;
+      } else if (accel == MODIFIER_CONTROL) {
+        modifier |= GDK_CONTROL_MASK;
+      }
+    }
+
+    token = strtok(nullptr, ", \t");
+  }
+
+  free(str);
+
+  return modifier;
+}
+
+static uint32_t ModifiersFrom(const dom::Element* aContent) {
+  const auto* element = RelevantElementForKeys(aContent);
+
+  nsAutoString modifiers;
+  element->GetAttr(nsGkAtoms::modifiers, modifiers);
+
+  return ParseModifiers(modifiers);
+}
+
+static void UpdateAccel(DbusmenuMenuitem* aItem, const nsIContent* aContent) {
+  uint32_t key = KeyFrom(aContent->AsElement());
+  if (key != 0) {
+    dbusmenu_menuitem_property_set_shortcut(
+        aItem, key,
+        static_cast<GdkModifierType>(ModifiersFrom(aContent->AsElement())));
+  }
+}
+
+static void UpdateRadioOrCheck(DbusmenuMenuitem* aItem,
+                               const dom::Element* aContent) {
+  static mozilla::dom::Element::AttrValuesArray attrs[] = {
+      nsGkAtoms::checkbox, nsGkAtoms::radio, nullptr};
+  int32_t type = aContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::type,
+                                           attrs, eCaseMatters);
+
+  if (type < 0 || type >= 2) {
+    return;
+  }
+
+  if (type == 0) {
+    dbusmenu_menuitem_property_set(aItem, DBUSMENU_MENUITEM_PROP_TOGGLE_TYPE,
+                                   DBUSMENU_MENUITEM_TOGGLE_CHECK);
+  } else {
+    dbusmenu_menuitem_property_set(aItem, DBUSMENU_MENUITEM_PROP_TOGGLE_TYPE,
+                                   DBUSMENU_MENUITEM_TOGGLE_RADIO);
+  }
+
+  bool isChecked = aContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::checked,
+                                         nsGkAtoms::_true, eCaseMatters);
+  dbusmenu_menuitem_property_set_int(
+      aItem, DBUSMENU_MENUITEM_PROP_TOGGLE_STATE,
+      isChecked ? DBUSMENU_MENUITEM_TOGGLE_STATE_CHECKED
+                : DBUSMENU_MENUITEM_TOGGLE_STATE_UNCHECKED);
+}
+
+static void UpdateEnabled(DbusmenuMenuitem* aItem, const nsIContent* aContent) {
+  bool disabled = aContent->AsElement()->AttrValueIs(
+      kNameSpaceID_None, nsGkAtoms::disabled, nsGkAtoms::_true, eCaseMatters);
+
+  dbusmenu_menuitem_property_set_bool(aItem, DBUSMENU_MENUITEM_PROP_ENABLED,
+                                      !disabled);
+}
+
+// we rebuild the dbus model when elements are removed from the DOM,
+// so this isn't going to trigger for asynchronous
+static MOZ_CAN_RUN_SCRIPT void DBusActivationCallback(
+    DbusmenuMenuitem* aMenuitem, guint aTimestamp, gpointer aUserData) {
+  RefPtr element = static_cast<dom::Element*>(aUserData);
+  ActivateItem(*element);
+}
+
+static void ConnectActivated(DbusmenuMenuitem* aItem,
+                             const dom::Element* aContent) {
+  g_signal_connect(G_OBJECT(aItem), DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED,
+                   G_CALLBACK(DBusActivationCallback),
+                   const_cast<dom::Element*>(aContent));
+}
+
+static MOZ_CAN_RUN_SCRIPT void DBusAboutToShowCallback(
+    DbusmenuMenuitem* aMenuitem, gpointer aUserData) {
+  RefPtr element = static_cast<dom::Element*>(aUserData);
+  FireEvent(element, eXULPopupShowing);
+  FireEvent(element, eXULPopupShown);
+}
+
+static void ConnectAboutToShow(DbusmenuMenuitem* aItem,
+                               const dom::Element* aContent) {
+  g_signal_connect(G_OBJECT(aItem), DBUSMENU_MENUITEM_SIGNAL_ABOUT_TO_SHOW,
+                   G_CALLBACK(DBusAboutToShowCallback),
+                   const_cast<dom::Element*>(aContent));
+}
+
+void MenubarModelDBus::AppendMenuItem(DbusmenuMenuitem* aParent,
+                                      const dom::Element* aChild) {
+  nsAutoString label;
+  aChild->GetAttr(nsGkAtoms::label, label);
+  if (label.IsEmpty()) {
+    aChild->GetAttr(nsGkAtoms::aria_label, label);
+  }
+  RefPtr<DbusmenuMenuitem> child = dont_AddRef(dbusmenu_menuitem_new());
+  dbusmenu_menuitem_property_set(child, DBUSMENU_MENUITEM_PROP_LABEL,
+                                 NS_ConvertUTF16toUTF8(label).get());
+  dbusmenu_menuitem_child_append(aParent, child);
+  UpdateAccel(child, aChild);
+  UpdateRadioOrCheck(child, aChild);
+  UpdateEnabled(child, aChild);
+  ConnectActivated(child, aChild);
+  // TODO: icons
+}
+
+void MenubarModelDBus::AppendSeparator(DbusmenuMenuitem* aParent) {
+  RefPtr<DbusmenuMenuitem> child = dont_AddRef(dbusmenu_menuitem_new());
+  dbusmenu_menuitem_property_set(child, DBUSMENU_MENUITEM_PROP_TYPE,
+                                 "separator");
+  dbusmenu_menuitem_child_append(aParent, child);
+}
+
+void MenubarModelDBus::AppendSubmenu(DbusmenuMenuitem* aParent,
+                                     const dom::Element* aMenu,
+                                     const dom::Element* aPopup) {
+  RefPtr<DbusmenuMenuitem> submenu = dont_AddRef(dbusmenu_menuitem_new());
+  if (RecomputeModelFor(submenu, *aPopup) == 0) {
+    RefPtr<DbusmenuMenuitem> placeholder = dont_AddRef(dbusmenu_menuitem_new());
+    dbusmenu_menuitem_child_append(submenu, placeholder);
+  }
+  nsAutoString label;
+  aMenu->GetAttr(nsGkAtoms::label, label);
+  ConnectAboutToShow(submenu, aPopup);
+  dbusmenu_menuitem_property_set(submenu, DBUSMENU_MENUITEM_PROP_LABEL,
+                                 NS_ConvertUTF16toUTF8(label).get());
+  dbusmenu_menuitem_child_append(aParent, submenu);
+}
+
+uint MenubarModelDBus::RecomputeModelFor(DbusmenuMenuitem* aParent,
+                                         const dom::Element& aElement) {
+  uint childCount = 0;
+  for (const nsIContent* child = aElement.GetFirstChild(); child;
+       child = child->GetNextSibling()) {
+    if (child->IsXULElement(nsGkAtoms::menuitem) &&
+        !IsDisabled(*child->AsElement())) {
+      AppendMenuItem(aParent, child->AsElement());
+      childCount++;
+      continue;
+    }
+    if (child->IsXULElement(nsGkAtoms::menuseparator)) {
+      AppendSeparator(aParent);
+      childCount++;
+      continue;
+    }
+    if (child->IsXULElement(nsGkAtoms::menu) &&
+        !IsDisabled(*child->AsElement())) {
+      if (const auto* popup = GetMenuPopupChild(*child->AsElement())) {
+        childCount++;
+        AppendSubmenu(aParent, child->AsElement(), popup);
+      }
+    }
+  }
+  return childCount;
+}
+
+void DBusMenuBar::NameOwnerChangedCallback(GObject*, GParamSpec*,
+                                           gpointer user_data) {
+  static_cast<DBusMenuBar*>(user_data)->OnNameOwnerChanged();
+}
+
+void DBusMenuBar::OnNameOwnerChanged() {
+  GUniquePtr<gchar> nameOwner(g_dbus_proxy_get_name_owner(mProxy));
+  if (!nameOwner) {
+    return;
+  }
+
+  RefPtr win = mMenuModel->Element()->OwnerDoc()->GetInnerWindow();
+  if (NS_WARN_IF(!win)) {
+    return;
+  }
+  nsIWidget* widget = nsGlobalWindowInner::Cast(win.get())->GetNearestWidget();
+  if (NS_WARN_IF(!widget)) {
+    return;
+  }
+  auto* gdkWin =
+      static_cast<GdkWindow*>(widget->GetNativeData(NS_NATIVE_WINDOW));
+  if (NS_WARN_IF(!gdkWin)) {
+    return;
+  }
+
+#  ifdef MOZ_WAYLAND
+  if (auto* display = widget::WaylandDisplayGet()) {
+    if (!StaticPrefs::widget_gtk_global_menu_wayland_enabled()) {
+      return;
+    }
+    xdg_dbus_annotation_manager_v1* annotationManager =
+        display->GetXdgDbusAnnotationManager();
+    if (NS_WARN_IF(!annotationManager)) {
+      return;
+    }
+
+    wl_surface* surface = gdk_wayland_window_get_wl_surface(gdkWin);
+    if (NS_WARN_IF(!surface)) {
+      return;
+    }
+
+    GDBusConnection* connection = g_dbus_proxy_get_connection(mProxy);
+    const char* myServiceName = g_dbus_connection_get_unique_name(connection);
+    if (NS_WARN_IF(!myServiceName)) {
+      return;
+    }
+
+    // FIXME(emilio, bug 1883209): Nothing deletes this as of right now.
+    mAnnotation = xdg_dbus_annotation_manager_v1_create_surface(
+        annotationManager, "com.canonical.dbusmenu", surface);
+
+    xdg_dbus_annotation_v1_set_address(mAnnotation, myServiceName,
+                                       mObjectPath.get());
+    return;
+  }
+#  endif
+#  ifdef MOZ_X11
+  // legacy path
+  auto xid = GDK_WINDOW_XID(gdkWin);
+  widget::DBusProxyCall(mProxy, "RegisterWindow",
+                        g_variant_new("(uo)", xid, mObjectPath.get()),
+                        G_DBUS_CALL_FLAGS_NONE)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [self = RefPtr{this}](RefPtr<GVariant>&& aResult) {
+            self->mMenuModel->Element()->SetBoolAttr(nsGkAtoms::hidden, true);
+          },
+          [self = RefPtr{this}](GUniquePtr<GError>&& aError) {
+            g_printerr("Failed to register window menubar: %s\n",
+                       aError->message);
+            self->mMenuModel->Element()->SetBoolAttr(nsGkAtoms::hidden, false);
+          });
+#  endif
+}
+
+static unsigned sID = 0;
+
+DBusMenuBar::DBusMenuBar(dom::Element* aElement)
+    : mObjectPath(nsPrintfCString("/com/canonical/menu/%u", sID++)),
+      mMenuModel(MakeRefPtr<MenubarModelDBus>(aElement)),
+      mServer(dont_AddRef(dbusmenu_server_new(mObjectPath.get()))) {
+  mMenuModel->RecomputeModelIfNeeded();
+  dbusmenu_server_set_root(mServer.get(), mMenuModel->Root());
+}
+
+RefPtr<DBusMenuBar> DBusMenuBar::Create(dom::Element* aElement) {
+  RefPtr<DBusMenuBar> self = new DBusMenuBar(aElement);
+  widget::CreateDBusProxyForBus(
+      G_BUS_TYPE_SESSION,
+      GDBusProxyFlags(G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
+                      G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
+                      G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START),
+      nullptr, "com.canonical.AppMenu.Registrar",
+      "/com/canonical/AppMenu/Registrar", "com.canonical.AppMenu.Registrar")
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [self](RefPtr<GDBusProxy>&& aProxy) {
+            self->mProxy = std::move(aProxy);
+            g_signal_connect(self->mProxy, "notify::g-name-owner",
+                             G_CALLBACK(NameOwnerChangedCallback), self.get());
+            self->OnNameOwnerChanged();
+          },
+          [](GUniquePtr<GError>&& aError) {
+            g_printerr("Failed to create DBUS proxy for menubar: %s\n",
+                       aError->message);
+          });
+  return self;
+}
+
+DBusMenuBar::~DBusMenuBar() {
+#  ifdef MOZ_WAYLAND
+  MozClearPointer(mAnnotation, xdg_dbus_annotation_v1_destroy);
+#  endif
+}
+#endif
+
 }  // namespace mozilla::widget
diff --git a/widget/gtk/NativeMenuGtk.h b/widget/gtk/NativeMenuGtk.h
index 3f1f3213c1..ca0f64c8ff 100644
--- a/widget/gtk/NativeMenuGtk.h
+++ b/widget/gtk/NativeMenuGtk.h
@@ -1,4 +1,3 @@
-
 /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
 /* 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
@@ -7,10 +6,13 @@
 #ifndef mozilla_widget_NativeMenuGtk_h
 #define mozilla_widget_NativeMenuGtk_h
 
+#include "mozilla/RefCounted.h"
 #include "mozilla/widget/NativeMenu.h"
 #include "mozilla/EventForwards.h"
 #include "GRefPtr.h"
 
+struct xdg_dbus_annotation_v1;
+
 namespace mozilla {
 
 namespace dom {
@@ -19,7 +21,8 @@ class Element;
 
 namespace widget {
 
-class MenuModel;
+class MenuModelGMenu;
+class MenubarModelDBus;
 
 class NativeMenuGtk : public NativeMenu {
  public:
@@ -54,10 +57,35 @@ class NativeMenuGtk : public NativeMenu {
 
   bool mPoppedUp = false;
   RefPtr<GtkWidget> mNativeMenu;
-  RefPtr<MenuModel> mMenuModel;
+  RefPtr<MenuModelGMenu> mMenuModel;
   nsTArray<NativeMenu::Observer*> mObservers;
 };
 
+#ifdef MOZ_ENABLE_DBUS
+
+class DBusMenuBar final : public RefCounted<DBusMenuBar> {
+ public:
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(DBusMenuBar)
+  static RefPtr<DBusMenuBar> Create(dom::Element*);
+  ~DBusMenuBar();
+
+ protected:
+  explicit DBusMenuBar(dom::Element* aElement);
+
+  static void NameOwnerChangedCallback(GObject*, GParamSpec*, gpointer);
+  void OnNameOwnerChanged();
+
+  nsCString mObjectPath;
+  RefPtr<MenubarModelDBus> mMenuModel;
+  RefPtr<DbusmenuServer> mServer;
+  RefPtr<GDBusProxy> mProxy;
+#  ifdef MOZ_WAYLAND
+  xdg_dbus_annotation_v1* mAnnotation = nullptr;
+#  endif
+};
+
+#endif
+
 }  // namespace widget
 }  // namespace mozilla
 
diff --git a/widget/gtk/NativeMenuSupport.cpp b/widget/gtk/NativeMenuSupport.cpp
index 4360867fff..60517cd526 100644
--- a/widget/gtk/NativeMenuSupport.cpp
+++ b/widget/gtk/NativeMenuSupport.cpp
@@ -5,8 +5,11 @@
 
 #include "mozilla/widget/NativeMenuSupport.h"
 
+#include "mozilla/StaticPrefs_widget.h"
 #include "MainThreadUtils.h"
 #include "NativeMenuGtk.h"
+#include "DBusMenu.h"
+#include "nsWindow.h"
 
 namespace mozilla::widget {
 
@@ -14,7 +17,14 @@ void NativeMenuSupport::CreateNativeMenuBar(nsIWidget* aParent,
                                             dom::Element* aMenuBarElement) {
   MOZ_RELEASE_ASSERT(NS_IsMainThread(),
                      "Attempting to create native menu bar on wrong thread!");
-  // TODO
+
+#ifdef MOZ_ENABLE_DBUS
+  if (aMenuBarElement && StaticPrefs::widget_gtk_global_menu_enabled() &&
+      DBusMenuFunctions::Init()) {
+    static_cast<nsWindow*>(aParent)->SetDBusMenuBar(
+        DBusMenuBar::Create(aMenuBarElement));
+  }
+#endif
 }
 
 already_AddRefed<NativeMenu> NativeMenuSupport::CreateNativeContextMenu(
diff --git a/widget/gtk/WakeLockListener.cpp b/widget/gtk/WakeLockListener.cpp
index b2c43cb485..33bb374cef 100644
--- a/widget/gtk/WakeLockListener.cpp
+++ b/widget/gtk/WakeLockListener.cpp
@@ -137,6 +137,7 @@ class WakeLockTopic {
   bool UninhibitWaylandIdle();
 #endif
 
+  bool IsNativeWakeLock(int aWakeLockType);
   bool IsWakeLockTypeAvailable(int aWakeLockType);
   bool SwitchToNextWakeLockType();
 
@@ -779,8 +780,14 @@ nsresult WakeLockTopic::InhibitScreensaver() {
   mShouldInhibit = true;
 
   // Iterate through wake lock types in case of failure.
-  while (!SendInhibit() && SwitchToNextWakeLockType()) {
-    ;
+  while (!SendInhibit()) {
+    // We don't switch away from native locks. Just try again.
+    if (IsNativeWakeLock(sWakeLockType)) {
+      return NS_ERROR_FAILURE;
+    }
+    if (!SwitchToNextWakeLockType()) {
+      return NS_ERROR_FAILURE;
+    }
   }
 
   return (sWakeLockType != Unsupported) ? NS_OK : NS_ERROR_FAILURE;
@@ -850,6 +857,21 @@ bool WakeLockTopic::IsWakeLockTypeAvailable(int aWakeLockType) {
   }
 }
 
+bool WakeLockTopic::IsNativeWakeLock(int aWakeLockType) {
+  switch (aWakeLockType) {
+#if defined(MOZ_X11)
+    case XScreenSaver:
+      return true;
+#endif
+#if defined(MOZ_WAYLAND)
+    case WaylandIdleInhibit:
+      return true;
+#endif
+    default:
+      return false;
+  }
+}
+
 bool WakeLockTopic::SwitchToNextWakeLockType() {
   WAKE_LOCK_LOG("WakeLockTopic::SwitchToNextWakeLockType() WakeLockType %s",
                 WakeLockTypeNames[sWakeLockType]);
diff --git a/widget/gtk/WidgetStyleCache.cpp b/widget/gtk/WidgetStyleCache.cpp
index b7c1cf8a9f..13b194a64e 100644
--- a/widget/gtk/WidgetStyleCache.cpp
+++ b/widget/gtk/WidgetStyleCache.cpp
@@ -644,10 +644,7 @@ static void CreateHeaderBarButtons() {
   GtkWidget* headerBar = sWidgetStorage[MOZ_GTK_HEADER_BAR];
   MOZ_ASSERT(headerBar, "We're missing header bar widget!");
 
-  gint buttonSpacing = 6;
-  g_object_get(headerBar, "spacing", &buttonSpacing, nullptr);
-
-  GtkWidget* buttonBox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, buttonSpacing);
+  GtkWidget* buttonBox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
   gtk_container_add(GTK_CONTAINER(headerBar), buttonBox);
   // We support only LTR headerbar layout for now.
   gtk_style_context_add_class(gtk_widget_get_style_context(buttonBox),
diff --git a/widget/gtk/WindowSurfaceProvider.cpp b/widget/gtk/WindowSurfaceProvider.cpp
index b346f0783d..82f9029315 100644
--- a/widget/gtk/WindowSurfaceProvider.cpp
+++ b/widget/gtk/WindowSurfaceProvider.cpp
@@ -63,24 +63,34 @@ WindowSurfaceProvider::~WindowSurfaceProvider() {
 }
 
 #ifdef MOZ_WAYLAND
-void WindowSurfaceProvider::Initialize(RefPtr<nsWindow> aWidget) {
+bool WindowSurfaceProvider::Initialize(RefPtr<nsWindow> aWidget) {
   mWindowSurfaceValid = false;
   mWidget = std::move(aWidget);
+  return true;
 }
-void WindowSurfaceProvider::Initialize(GtkCompositorWidget* aCompositorWidget) {
+bool WindowSurfaceProvider::Initialize(GtkCompositorWidget* aCompositorWidget) {
   mWindowSurfaceValid = false;
   mCompositorWidget = aCompositorWidget;
   mWidget = static_cast<nsWindow*>(aCompositorWidget->RealWidget());
+  return true;
 }
 #endif
 #ifdef MOZ_X11
-void WindowSurfaceProvider::Initialize(Window aWindow, Visual* aVisual,
-                                       int aDepth, bool aIsShaped) {
+bool WindowSurfaceProvider::Initialize(Window aWindow, bool aIsShaped) {
   mWindowSurfaceValid = false;
+
+  // Grab the window's visual and depth
+  XWindowAttributes windowAttrs;
+  if (!XGetWindowAttributes(DefaultXDisplay(), aWindow, &windowAttrs)) {
+    NS_WARNING("GtkCompositorWidget(): XGetWindowAttributes() failed!");
+    return false;
+  }
+
   mXWindow = aWindow;
-  mXVisual = aVisual;
-  mXDepth = aDepth;
+  mXVisual = windowAttrs.visual;
+  mXDepth = windowAttrs.depth;
   mIsShaped = aIsShaped;
+  return true;
 }
 #endif
 
diff --git a/widget/gtk/WindowSurfaceProvider.h b/widget/gtk/WindowSurfaceProvider.h
index a040bbe395..6aaf50e2da 100644
--- a/widget/gtk/WindowSurfaceProvider.h
+++ b/widget/gtk/WindowSurfaceProvider.h
@@ -45,11 +45,12 @@ class WindowSurfaceProvider final {
    * while WindowSurfaceProvider is used.
    */
 #ifdef MOZ_WAYLAND
-  void Initialize(RefPtr<nsWindow> aWidget);
-  void Initialize(GtkCompositorWidget* aCompositorWidget);
+  bool Initialize(RefPtr<nsWindow> aWidget);
+  bool Initialize(GtkCompositorWidget* aCompositorWidget);
 #endif
 #ifdef MOZ_X11
-  void Initialize(Window aWindow, Visual* aVisual, int aDepth, bool aIsShaped);
+  bool Initialize(Window aWindow, bool aIsShaped);
+  Window GetXWindow() const { return mXWindow; }
 #endif
 
   /**
diff --git a/widget/gtk/gtk3drawing.cpp b/widget/gtk/gtk3drawing.cpp
index 1fa8b95606..122b43d688 100644
--- a/widget/gtk/gtk3drawing.cpp
+++ b/widget/gtk/gtk3drawing.cpp
@@ -1,4 +1,4 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
@@ -264,7 +264,6 @@ static void CalculateToolbarButtonMetrics(WidgetNodeType aAppearance,
   gint iconWidth, iconHeight;
   if (!gtk_icon_size_lookup(GTK_ICON_SIZE_MENU, &iconWidth, &iconHeight)) {
     NS_WARNING("Failed to get Gtk+ icon size for titlebar button!");
-
     // Use some reasonable fallback size
     iconWidth = 16;
     iconHeight = 16;
@@ -292,37 +291,7 @@ static void CalculateToolbarButtonMetrics(WidgetNodeType aAppearance,
   // Place icon at button center.
   aMetrics->iconXPosition = (width - iconWidth) / 2;
   aMetrics->iconYPosition = (height - iconHeight) / 2;
-
-  aMetrics->minSizeWithBorderMargin.width = width;
-  aMetrics->minSizeWithBorderMargin.height = height;
-}
-
-// We support LTR layout only here for now.
-static void CalculateToolbarButtonSpacing(WidgetNodeType aAppearance,
-                                          ToolbarButtonGTKMetrics* aMetrics) {
-  GtkStyleContext* style = GetStyleContext(aAppearance);
-  gtk_style_context_get_margin(style, gtk_style_context_get_state(style),
-                               &aMetrics->buttonMargin);
-
-  // Get titlebar spacing, a default one is 6 pixels (gtk/gtkheaderbar.c)
-  gint buttonSpacing = 6;
-  g_object_get(GetWidget(MOZ_GTK_HEADER_BAR), "spacing", &buttonSpacing,
-               nullptr);
-
-  // We apply spacing as a margin equally to both adjacent buttons.
-  buttonSpacing /= 2;
-
-  if (!aMetrics->firstButton) {
-    aMetrics->buttonMargin.left += buttonSpacing;
-  }
-  if (!aMetrics->lastButton) {
-    aMetrics->buttonMargin.right += buttonSpacing;
-  }
-
-  aMetrics->minSizeWithBorderMargin.width +=
-      aMetrics->buttonMargin.right + aMetrics->buttonMargin.left;
-  aMetrics->minSizeWithBorderMargin.height +=
-      aMetrics->buttonMargin.top + aMetrics->buttonMargin.bottom;
+  aMetrics->minSizeWithBorder = {width, height};
 }
 
 size_t GetGtkHeaderBarButtonLayout(Span<ButtonLayout> aButtonLayout,
@@ -388,26 +357,14 @@ static void EnsureToolbarMetrics() {
   memset(&sToolbarMetrics, 0, sizeof(sToolbarMetrics));
 
   // Calculate titlebar button visibility and positions.
-  ButtonLayout aButtonLayout[TOOLBAR_BUTTONS];
+  ButtonLayout buttonLayout[TOOLBAR_BUTTONS];
   size_t activeButtonNums =
-      GetGtkHeaderBarButtonLayout(Span(aButtonLayout), nullptr);
-
-  for (size_t i = 0; i < activeButtonNums; i++) {
-    int buttonIndex =
-        (aButtonLayout[i].mType - MOZ_GTK_HEADER_BAR_BUTTON_CLOSE);
-    ToolbarButtonGTKMetrics* metrics = sToolbarMetrics.button + buttonIndex;
-    metrics->visible = true;
-    // Mark first button
-    if (!i) {
-      metrics->firstButton = true;
-    }
-    // Mark last button.
-    if (i == (activeButtonNums - 1)) {
-      metrics->lastButton = true;
-    }
+      GetGtkHeaderBarButtonLayout(Span(buttonLayout), nullptr);
 
-    CalculateToolbarButtonMetrics(aButtonLayout[i].mType, metrics);
-    CalculateToolbarButtonSpacing(aButtonLayout[i].mType, metrics);
+  for (const auto& layout : Span(buttonLayout, activeButtonNums)) {
+    int buttonIndex = layout.mType - MOZ_GTK_HEADER_BAR_BUTTON_CLOSE;
+    ToolbarButtonGTKMetrics* metrics = &sToolbarMetrics.button[buttonIndex];
+    CalculateToolbarButtonMetrics(layout.mType, metrics);
   }
 
   sToolbarMetrics.initialized = true;
@@ -506,26 +463,27 @@ static gint moz_gtk_button_paint(cairo_t* cr, const GdkRectangle* rect,
   return MOZ_GTK_SUCCESS;
 }
 
-static gint moz_gtk_header_bar_button_paint(cairo_t* cr,
-                                            const GdkRectangle* aRect,
+static gint moz_gtk_header_bar_button_paint(cairo_t* cr, GdkRectangle* aRect,
                                             GtkWidgetState* state,
                                             GtkReliefStyle relief,
                                             WidgetNodeType aIconWidgetType,
                                             GtkTextDirection direction) {
-  GdkRectangle rect = *aRect;
-  // We need to inset our calculated margin because it also
-  // contains titlebar button spacing.
+  GtkWidget* buttonWidget = GetWidget(aIconWidgetType);
+  if (!buttonWidget) {
+    return MOZ_GTK_UNKNOWN_WIDGET;
+  }
+
   const ToolbarButtonGTKMetrics* metrics = GetToolbarButtonMetrics(
       aIconWidgetType == MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE_RESTORE
           ? MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE
           : aIconWidgetType);
-  Inset(&rect, metrics->buttonMargin);
-
-  GtkWidget* buttonWidget = GetWidget(aIconWidgetType);
-  if (!buttonWidget) {
-    return MOZ_GTK_UNKNOWN_WIDGET;
+  // Vertically center and clamp the rect to the desired size.
+  if (aRect->height > metrics->minSizeWithBorder.height) {
+    gint diff = aRect->height - metrics->minSizeWithBorder.height;
+    aRect->y += diff / 2;
+    aRect->height = metrics->minSizeWithBorder.height;
   }
-  moz_gtk_button_paint(cr, &rect, state, relief, buttonWidget, direction);
+  moz_gtk_button_paint(cr, aRect, state, relief, buttonWidget, direction);
 
   GtkWidget* iconWidget =
       gtk_bin_get_child(GTK_BIN(GetWidget(aIconWidgetType)));
@@ -544,8 +502,9 @@ static gint moz_gtk_header_bar_button_paint(cairo_t* cr,
     gtk_style_context_set_state(style, state_flags);
 
     /* This is available since Gtk+ 3.10 as well as GtkHeaderBar */
-    gtk_render_icon_surface(style, cr, surface, rect.x + metrics->iconXPosition,
-                            rect.y + metrics->iconYPosition);
+    gtk_render_icon_surface(style, cr, surface,
+                            aRect->x + metrics->iconXPosition,
+                            aRect->y + metrics->iconYPosition);
     gtk_style_context_restore(style);
   }
 
@@ -1700,22 +1659,6 @@ gint moz_gtk_get_widget_border(WidgetNodeType widget, gint* left, gint* top,
 
       return MOZ_GTK_SUCCESS;
     }
-    case MOZ_GTK_HEADER_BAR_BUTTON_BOX: {
-      style = GetStyleContext(MOZ_GTK_HEADER_BAR);
-      moz_gtk_add_border_padding(style, left, top, right, bottom);
-      *top = *bottom = 0;
-      bool leftButtonsPlacement = false;
-      GetGtkHeaderBarButtonLayout({}, &leftButtonsPlacement);
-      if (direction == GTK_TEXT_DIR_RTL) {
-        leftButtonsPlacement = !leftButtonsPlacement;
-      }
-      if (leftButtonsPlacement) {
-        *right = 0;
-      } else {
-        *left = 0;
-      }
-      return MOZ_GTK_SUCCESS;
-    }
     /* These widgets have no borders, since they are not containers. */
     case MOZ_GTK_SPLITTER_HORIZONTAL:
     case MOZ_GTK_SPLITTER_VERTICAL:
diff --git a/widget/gtk/gtkdrawing.h b/widget/gtk/gtkdrawing.h
index e751dc38c9..4ca226d9c7 100644
--- a/widget/gtk/gtkdrawing.h
+++ b/widget/gtk/gtkdrawing.h
@@ -76,13 +76,9 @@ typedef struct {
 } ToggleGTKMetrics;
 
 typedef struct {
-  MozGtkSize minSizeWithBorderMargin;
-  GtkBorder buttonMargin;
+  MozGtkSize minSizeWithBorder;
   gint iconXPosition;
   gint iconYPosition;
-  bool visible;
-  bool firstButton;
-  bool lastButton;
 } ToolbarButtonGTKMetrics;
 
 #define TOOLBAR_BUTTONS 3
@@ -269,8 +265,6 @@ enum WidgetNodeType : int {
   MOZ_GTK_HEADER_BAR,
   /* Paints a GtkHeaderBar in maximized state */
   MOZ_GTK_HEADER_BAR_MAXIMIZED,
-  /* Container for GtkHeaderBar buttons */
-  MOZ_GTK_HEADER_BAR_BUTTON_BOX,
   /* Paints GtkHeaderBar title buttons.
    * Keep the order here as MOZ_GTK_HEADER_BAR_BUTTON_* are processed
    * as an array from MOZ_GTK_HEADER_BAR_BUTTON_CLOSE to the last one.
diff --git a/widget/gtk/moz.build b/widget/gtk/moz.build
index 0d3916853c..87866b1a9b 100644
--- a/widget/gtk/moz.build
+++ b/widget/gtk/moz.build
@@ -173,6 +173,7 @@ if CONFIG["MOZ_ENABLE_DBUS"]:
     ]
     UNIFIED_SOURCES += [
         "AsyncDBus.cpp",
+        "DBusMenu.cpp",
     ]
     CXXFLAGS += CONFIG["MOZ_DBUS_CFLAGS"]
 
diff --git a/widget/gtk/nsGtkKeyUtils.cpp b/widget/gtk/nsGtkKeyUtils.cpp
index 7157a09664..e49f64a64b 100644
--- a/widget/gtk/nsGtkKeyUtils.cpp
+++ b/widget/gtk/nsGtkKeyUtils.cpp
@@ -2125,6 +2125,212 @@ guint KeymapWrapper::GetGDKKeyvalWithoutModifier(
   return keyval;
 }
 
+struct KeyCodeData {
+  const char* str;
+  size_t strlength;
+  uint32_t keycode;
+};
+
+static struct KeyCodeData gKeyCodes[] = {
+#define NS_DEFINE_VK(aDOMKeyName, aDOMKeyCode) \
+  {#aDOMKeyName, sizeof(#aDOMKeyName) - 1, aDOMKeyCode},
+#include "mozilla/VirtualKeyCodeList.h"
+#undef NS_DEFINE_VK
+    {nullptr, 0, 0}};
+
+struct KeyPair {
+  uint32_t DOMKeyCode;
+  guint GDKKeyval;
+};
+
+//
+// Netscape keycodes are defined in widget/public/nsGUIEvent.h
+// GTK keycodes are defined in <gdk/gdkkeysyms.h>
+//
+static const KeyPair gKeyPairs[] = {
+    {NS_VK_CANCEL, GDK_Cancel},
+    {NS_VK_BACK, GDK_BackSpace},
+    {NS_VK_TAB, GDK_Tab},
+    {NS_VK_CLEAR, GDK_Clear},
+    {NS_VK_RETURN, GDK_Return},
+    {NS_VK_SHIFT, GDK_Shift_L},
+    {NS_VK_CONTROL, GDK_Control_L},
+    {NS_VK_ALT, GDK_Alt_L},
+    {NS_VK_META, GDK_Meta_L},
+
+    // Assume that Super or Hyper is always mapped to physical Win key.
+    {NS_VK_WIN, GDK_Super_L},
+
+    // GTK's AltGraph key is similar to Mac's Option (Alt) key.  However,
+    // unfortunately, browsers on Mac are using NS_VK_ALT for it even though
+    // it's really different from Alt key on Windows.
+    // On the other hand, GTK's AltGrapsh keys are really different from
+    // Alt key.  However, there is no AltGrapsh key on Windows.  On Windows,
+    // both Ctrl and Alt keys are pressed internally when AltGr key is pressed.
+    // For some languages' users, AltGraph key is important, so, web
+    // applications on such locale may want to know AltGraph key press.
+    // Therefore, we should map AltGr keycode for them only on GTK.
+    {NS_VK_ALTGR, GDK_ISO_Level3_Shift},
+
+    {NS_VK_PAUSE, GDK_Pause},
+    {NS_VK_CAPS_LOCK, GDK_Caps_Lock},
+    {NS_VK_ESCAPE, GDK_Escape},
+    // { NS_VK_ACCEPT,     GDK_XXX },
+    // { NS_VK_MODECHANGE, GDK_XXX },
+    {NS_VK_SPACE, GDK_space},
+    {NS_VK_PAGE_UP, GDK_Page_Up},
+    {NS_VK_PAGE_DOWN, GDK_Page_Down},
+    {NS_VK_END, GDK_End},
+    {NS_VK_HOME, GDK_Home},
+    {NS_VK_LEFT, GDK_Left},
+    {NS_VK_UP, GDK_Up},
+    {NS_VK_RIGHT, GDK_Right},
+    {NS_VK_DOWN, GDK_Down},
+    {NS_VK_SELECT, GDK_Select},
+    {NS_VK_PRINT, GDK_Print},
+    {NS_VK_EXECUTE, GDK_Execute},
+    {NS_VK_PRINTSCREEN, GDK_Print},
+    {NS_VK_INSERT, GDK_Insert},
+    {NS_VK_DELETE, GDK_Delete},
+    {NS_VK_HELP, GDK_Help},
+
+    {NS_VK_NUM_LOCK, GDK_Num_Lock},
+    {NS_VK_SCROLL_LOCK, GDK_Scroll_Lock},
+
+    // Function keys
+    {NS_VK_F1, GDK_F1},
+    {NS_VK_F2, GDK_F2},
+    {NS_VK_F3, GDK_F3},
+    {NS_VK_F4, GDK_F4},
+    {NS_VK_F5, GDK_F5},
+    {NS_VK_F6, GDK_F6},
+    {NS_VK_F7, GDK_F7},
+    {NS_VK_F8, GDK_F8},
+    {NS_VK_F9, GDK_F9},
+    {NS_VK_F10, GDK_F10},
+    {NS_VK_F11, GDK_F11},
+    {NS_VK_F12, GDK_F12},
+    {NS_VK_F13, GDK_F13},
+    {NS_VK_F14, GDK_F14},
+    {NS_VK_F15, GDK_F15},
+    {NS_VK_F16, GDK_F16},
+    {NS_VK_F17, GDK_F17},
+    {NS_VK_F18, GDK_F18},
+    {NS_VK_F19, GDK_F19},
+    {NS_VK_F20, GDK_F20},
+    {NS_VK_F21, GDK_F21},
+    {NS_VK_F22, GDK_F22},
+    {NS_VK_F23, GDK_F23},
+    {NS_VK_F24, GDK_F24},
+
+    // context menu key, keysym 0xff67, typically keycode 117 on 105-key
+    // (Microsoft) x86 keyboards, located between right 'Windows' key and right
+    // Ctrl key
+    {NS_VK_CONTEXT_MENU, GDK_Menu},
+    {NS_VK_SLEEP, GDK_Sleep},
+
+    {NS_VK_ATTN, GDK_3270_Attn},
+    {NS_VK_CRSEL, GDK_3270_CursorSelect},
+    {NS_VK_EXSEL, GDK_3270_ExSelect},
+    {NS_VK_EREOF, GDK_3270_EraseEOF},
+    {NS_VK_PLAY, GDK_3270_Play},
+    //{ NS_VK_ZOOM,       GDK_XXX },
+    {NS_VK_PA1, GDK_3270_PA1},
+
+    {NS_VK_MULTIPLY, GDK_KP_Multiply},
+    {NS_VK_ADD, GDK_KP_Add},
+    {NS_VK_SEPARATOR, GDK_KP_Separator},
+    {NS_VK_SUBTRACT, GDK_KP_Subtract},
+    {NS_VK_DECIMAL, GDK_KP_Decimal},
+    {NS_VK_DIVIDE, GDK_KP_Divide},
+    {NS_VK_NUMPAD0, GDK_KP_0},
+    {NS_VK_NUMPAD1, GDK_KP_1},
+    {NS_VK_NUMPAD2, GDK_KP_2},
+    {NS_VK_NUMPAD3, GDK_KP_3},
+    {NS_VK_NUMPAD4, GDK_KP_4},
+    {NS_VK_NUMPAD5, GDK_KP_5},
+    {NS_VK_NUMPAD6, GDK_KP_6},
+    {NS_VK_NUMPAD7, GDK_KP_7},
+    {NS_VK_NUMPAD8, GDK_KP_8},
+    {NS_VK_NUMPAD9, GDK_KP_9},
+    {NS_VK_SPACE, GDK_space},
+    {NS_VK_COLON, GDK_colon},
+    {NS_VK_SEMICOLON, GDK_semicolon},
+    {NS_VK_LESS_THAN, GDK_less},
+    {NS_VK_EQUALS, GDK_equal},
+    {NS_VK_GREATER_THAN, GDK_greater},
+    {NS_VK_QUESTION_MARK, GDK_question},
+    {NS_VK_AT, GDK_at},
+    {NS_VK_CIRCUMFLEX, GDK_asciicircum},
+    {NS_VK_EXCLAMATION, GDK_exclam},
+    {NS_VK_DOUBLE_QUOTE, GDK_quotedbl},
+    {NS_VK_HASH, GDK_numbersign},
+    {NS_VK_DOLLAR, GDK_dollar},
+    {NS_VK_PERCENT, GDK_percent},
+    {NS_VK_AMPERSAND, GDK_ampersand},
+    {NS_VK_UNDERSCORE, GDK_underscore},
+    {NS_VK_OPEN_PAREN, GDK_parenleft},
+    {NS_VK_CLOSE_PAREN, GDK_parenright},
+    {NS_VK_ASTERISK, GDK_asterisk},
+    {NS_VK_PLUS, GDK_plus},
+    {NS_VK_PIPE, GDK_bar},
+    {NS_VK_HYPHEN_MINUS, GDK_minus},
+    {NS_VK_OPEN_CURLY_BRACKET, GDK_braceleft},
+    {NS_VK_CLOSE_CURLY_BRACKET, GDK_braceright},
+    {NS_VK_TILDE, GDK_asciitilde},
+    {NS_VK_COMMA, GDK_comma},
+    {NS_VK_PERIOD, GDK_period},
+    {NS_VK_SLASH, GDK_slash},
+    {NS_VK_BACK_QUOTE, GDK_grave},
+    {NS_VK_OPEN_BRACKET, GDK_bracketleft},
+    {NS_VK_BACK_SLASH, GDK_backslash},
+    {NS_VK_CLOSE_BRACKET, GDK_bracketright},
+    {NS_VK_QUOTE, GDK_apostrophe},
+};
+
+/* static */
+guint KeymapWrapper::ConvertGeckoKeyCodeToGDKKeyval(const nsAString& aKeyCode) {
+  NS_ConvertUTF16toUTF8 keyName(aKeyCode);
+  ToUpperCase(keyName);  // We want case-insensitive comparison with data
+                         // stored as uppercase.
+
+  uint32_t keyCode = 0;
+
+  uint32_t keyNameLength = keyName.Length();
+  const char* keyNameStr = keyName.get();
+  for (const auto& code : gKeyCodes) {
+    if (keyNameLength == code.strlength &&
+        !nsCRT::strcmp(code.str, keyNameStr)) {
+      keyCode = code.keycode;
+      break;
+    }
+  }
+
+  // First, try to handle alphanumeric input, not listed in nsKeycodes:
+  // most likely, more letters will be getting typed in than things in
+  // the key list, so we will look through these first.
+
+  if (keyCode >= NS_VK_A && keyCode <= NS_VK_Z) {
+    // gdk and DOM both use the ASCII codes for these keys.
+    return keyCode;
+  }
+
+  // numbers
+  if (keyCode >= NS_VK_0 && keyCode <= NS_VK_9) {
+    // gdk and DOM both use the ASCII codes for these keys.
+    return keyCode - NS_VK_0 + GDK_0;
+  }
+
+  // misc other things
+  for (const auto& pair : gKeyPairs) {
+    if (pair.DOMKeyCode == keyCode) {
+      return pair.GDKKeyval;
+    }
+  }
+
+  return 0;
+}
+
 /* static */
 uint32_t KeymapWrapper::GetDOMKeyCodeFromKeyPairs(guint aGdkKeyval) {
   switch (aGdkKeyval) {
diff --git a/widget/gtk/nsGtkKeyUtils.h b/widget/gtk/nsGtkKeyUtils.h
index aac9d446f3..b1f1fae138 100644
--- a/widget/gtk/nsGtkKeyUtils.h
+++ b/widget/gtk/nsGtkKeyUtils.h
@@ -55,6 +55,8 @@ class KeymapWrapper {
    */
   static CodeNameIndex ComputeDOMCodeNameIndex(const GdkEventKey* aGdkKeyEvent);
 
+  static guint ConvertGeckoKeyCodeToGDKKeyval(const nsAString& aKeyCode);
+
   /**
    * We need to translate modifiers masks from Gdk to Gecko.
    * MappedModifier is a table of mapped modifiers, we ignore other
diff --git a/widget/gtk/nsLookAndFeel.cpp b/widget/gtk/nsLookAndFeel.cpp
index c4b430d2eb..040d942cdf 100644
--- a/widget/gtk/nsLookAndFeel.cpp
+++ b/widget/gtk/nsLookAndFeel.cpp
@@ -905,10 +905,6 @@ nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
       aResult = (int32_t)delay;
       break;
     }
-    case IntID::TooltipDelay: {
-      aResult = 500;
-      break;
-    }
     case IntID::MenusCanOverlapOSBar:
       // we want XUL popups to be able to overlap the task bar.
       aResult = 1;
@@ -1035,6 +1031,11 @@ nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
       aResult = EffectiveTheme().mTitlebarRadius;
       break;
     }
+    case IntID::TitlebarButtonSpacing: {
+      EnsureInit();
+      aResult = EffectiveTheme().mTitlebarButtonSpacing;
+      break;
+    }
     case IntID::AllowOverlayScrollbarsOverlap: {
       aResult = 1;
       break;
@@ -1976,6 +1977,10 @@ void nsLookAndFeel::PerThemeData::Init() {
     mTitlebar = GetColorPair(style, GTK_STATE_FLAG_NORMAL);
     mTitlebarInactive = GetColorPair(style, GTK_STATE_FLAG_BACKDROP);
     mTitlebarRadius = IsSolidCSDStyleUsed() ? 0 : GetBorderRadius(style);
+    // Get titlebar spacing, a default one is 6 pixels (gtk/gtkheaderbar.c)
+    mTitlebarButtonSpacing = 6;
+    g_object_get(GetWidget(MOZ_GTK_HEADER_BAR), "spacing",
+                 &mTitlebarButtonSpacing, nullptr);
   }
 
   // We special-case the header bar color in Adwaita, Yaru and Breeze to be the
diff --git a/widget/gtk/nsLookAndFeel.h b/widget/gtk/nsLookAndFeel.h
index 56608d331f..1ef28afe21 100644
--- a/widget/gtk/nsLookAndFeel.h
+++ b/widget/gtk/nsLookAndFeel.h
@@ -137,6 +137,7 @@ class nsLookAndFeel final : public nsXPLookAndFeel {
 
     float mCaretRatio = 0.0f;
     int32_t mTitlebarRadius = 0;
+    int32_t mTitlebarButtonSpacing = 0;
     char16_t mInvisibleCharacter = 0;
     bool mMenuSupportsDrag = false;
 
diff --git a/widget/gtk/nsNativeThemeGTK.cpp b/widget/gtk/nsNativeThemeGTK.cpp
index 06d9b48007..16945349bb 100644
--- a/widget/gtk/nsNativeThemeGTK.cpp
+++ b/widget/gtk/nsNativeThemeGTK.cpp
@@ -191,6 +191,10 @@ bool nsNativeThemeGTK::GetGtkWidgetAndState(StyleAppearance aAppearance,
         aAppearance == StyleAppearance::Toolbarbutton ||
         aAppearance == StyleAppearance::Dualbutton ||
         aAppearance == StyleAppearance::ToolbarbuttonDropdown ||
+        aAppearance == StyleAppearance::MozWindowButtonMinimize ||
+        aAppearance == StyleAppearance::MozWindowButtonRestore ||
+        aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+        aAppearance == StyleAppearance::MozWindowButtonClose ||
         aAppearance == StyleAppearance::Menulist ||
         aAppearance == StyleAppearance::MenulistButton) {
       aState->active &= aState->inHover;
@@ -392,9 +396,6 @@ bool nsNativeThemeGTK::GetGtkWidgetAndState(StyleAppearance aAppearance,
     case StyleAppearance::MozWindowTitlebarMaximized:
       aGtkWidgetType = MOZ_GTK_HEADER_BAR_MAXIMIZED;
       break;
-    case StyleAppearance::MozWindowButtonBox:
-      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_BOX;
-      break;
     case StyleAppearance::MozWindowButtonClose:
       aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_CLOSE;
       break;
@@ -676,16 +677,6 @@ CSSIntMargin nsNativeThemeGTK::GetExtraSizeForWidget(
   return extra;
 }
 
-bool nsNativeThemeGTK::IsWidgetVisible(StyleAppearance aAppearance) {
-  switch (aAppearance) {
-    case StyleAppearance::MozWindowButtonBox:
-      return false;
-    default:
-      break;
-  }
-  return true;
-}
-
 NS_IMETHODIMP
 nsNativeThemeGTK::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
                                        StyleAppearance aAppearance,
@@ -702,8 +693,7 @@ nsNativeThemeGTK::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
   GtkTextDirection direction = GetTextDirection(aFrame);
   gint flags;
 
-  if (!IsWidgetVisible(aAppearance) ||
-      !GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, &state,
+  if (!GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, &state,
                             &flags)) {
     return NS_OK;
   }
@@ -937,7 +927,6 @@ bool nsNativeThemeGTK::GetWidgetPadding(nsDeviceContext* aContext,
   switch (aAppearance) {
     case StyleAppearance::Toolbarbutton:
     case StyleAppearance::Tooltip:
-    case StyleAppearance::MozWindowButtonBox:
     case StyleAppearance::MozWindowButtonClose:
     case StyleAppearance::MozWindowButtonMinimize:
     case StyleAppearance::MozWindowButtonMaximize:
@@ -1072,23 +1061,23 @@ LayoutDeviceIntSize nsNativeThemeGTK::GetMinimumWidgetSize(
     case StyleAppearance::MozWindowButtonClose: {
       const ToolbarButtonGTKMetrics* metrics =
           GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_CLOSE);
-      result.width = metrics->minSizeWithBorderMargin.width;
-      result.height = metrics->minSizeWithBorderMargin.height;
+      result.width = metrics->minSizeWithBorder.width;
+      result.height = metrics->minSizeWithBorder.height;
       break;
     }
     case StyleAppearance::MozWindowButtonMinimize: {
       const ToolbarButtonGTKMetrics* metrics =
           GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE);
-      result.width = metrics->minSizeWithBorderMargin.width;
-      result.height = metrics->minSizeWithBorderMargin.height;
+      result.width = metrics->minSizeWithBorder.width;
+      result.height = metrics->minSizeWithBorder.height;
       break;
     }
     case StyleAppearance::MozWindowButtonMaximize:
     case StyleAppearance::MozWindowButtonRestore: {
       const ToolbarButtonGTKMetrics* metrics =
           GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE);
-      result.width = metrics->minSizeWithBorderMargin.width;
-      result.height = metrics->minSizeWithBorderMargin.height;
+      result.width = metrics->minSizeWithBorder.width;
+      result.height = metrics->minSizeWithBorder.height;
       break;
     }
     case StyleAppearance::Button:
@@ -1288,7 +1277,6 @@ nsNativeThemeGTK::ThemeSupportsWidget(nsPresContext* aPresContext,
     case StyleAppearance::Range:
     case StyleAppearance::RangeThumb:
     case StyleAppearance::Splitter:
-    case StyleAppearance::MozWindowButtonBox:
     case StyleAppearance::MozWindowButtonClose:
     case StyleAppearance::MozWindowButtonMinimize:
     case StyleAppearance::MozWindowButtonMaximize:
diff --git a/widget/gtk/nsNativeThemeGTK.h b/widget/gtk/nsNativeThemeGTK.h
index 2d0878290e..62a046c959 100644
--- a/widget/gtk/nsNativeThemeGTK.h
+++ b/widget/gtk/nsNativeThemeGTK.h
@@ -93,7 +93,6 @@ class nsNativeThemeGTK final : public mozilla::widget::Theme {
                             WidgetNodeType& aGtkWidgetType,
                             GtkWidgetState* aState, gint* aWidgetFlags);
   mozilla::CSSIntMargin GetExtraSizeForWidget(nsIFrame*, StyleAppearance);
-  bool IsWidgetVisible(StyleAppearance aAppearance);
 
   void RefreshWidgetWindow(nsIFrame* aFrame);
   WidgetNodeType NativeThemeToGtkTheme(StyleAppearance aAppearance,
diff --git a/widget/gtk/nsWaylandDisplay.cpp b/widget/gtk/nsWaylandDisplay.cpp
index 2a1021457a..1ea87b3bc5 100644
--- a/widget/gtk/nsWaylandDisplay.cpp
+++ b/widget/gtk/nsWaylandDisplay.cpp
@@ -93,6 +93,11 @@ void nsWaylandDisplay::SetXdgActivation(xdg_activation_v1* aXdgActivation) {
   mXdgActivation = aXdgActivation;
 }
 
+void nsWaylandDisplay::SetXdgDbusAnnotationManager(
+    xdg_dbus_annotation_manager_v1* aXdgDbusAnnotationManager) {
+  mXdgDbusAnnotationManager = aXdgDbusAnnotationManager;
+}
+
 static void global_registry_handler(void* data, wl_registry* registry,
                                     uint32_t id, const char* interface,
                                     uint32_t version) {
@@ -140,6 +145,11 @@ static void global_registry_handler(void* data, wl_registry* registry,
     auto* activation = WaylandRegistryBind<xdg_activation_v1>(
         registry, id, &xdg_activation_v1_interface, 1);
     display->SetXdgActivation(activation);
+  } else if (iface.EqualsLiteral("xdg_dbus_annotation_manager_v1")) {
+    auto* annotationManager =
+        WaylandRegistryBind<xdg_dbus_annotation_manager_v1>(
+            registry, id, &xdg_dbus_annotation_manager_v1_interface, 1);
+    display->SetXdgDbusAnnotationManager(annotationManager);
   } else if (iface.EqualsLiteral("wl_seat")) {
     // Install keyboard handlers for main thread only
     auto* seat =
diff --git a/widget/gtk/nsWaylandDisplay.h b/widget/gtk/nsWaylandDisplay.h
index cd8124d97f..40250c2bf2 100644
--- a/widget/gtk/nsWaylandDisplay.h
+++ b/widget/gtk/nsWaylandDisplay.h
@@ -19,6 +19,7 @@
 #include "mozilla/widget/linux-dmabuf-unstable-v1-client-protocol.h"
 #include "mozilla/widget/viewporter-client-protocol.h"
 #include "mozilla/widget/xdg-activation-v1-client-protocol.h"
+#include "mozilla/widget/xdg-dbus-annotation-v1-client-protocol.h"
 #include "mozilla/widget/xdg-output-unstable-v1-client-protocol.h"
 
 namespace mozilla::widget {
@@ -48,6 +49,9 @@ class nsWaylandDisplay {
   }
   zwp_linux_dmabuf_v1* GetDmabuf() { return mDmabuf; };
   xdg_activation_v1* GetXdgActivation() { return mXdgActivation; };
+  xdg_dbus_annotation_manager_v1* GetXdgDbusAnnotationManager() {
+    return mXdgDbusAnnotationManager;
+  }
   wp_fractional_scale_manager_v1* GetFractionalScaleManager() {
     return mFractionalScaleManager;
   }
@@ -64,6 +68,8 @@ class nsWaylandDisplay {
   void SetPointerConstraints(zwp_pointer_constraints_v1* aPointerConstraints);
   void SetDmabuf(zwp_linux_dmabuf_v1* aDmabuf);
   void SetXdgActivation(xdg_activation_v1* aXdgActivation);
+  void SetXdgDbusAnnotationManager(
+      xdg_dbus_annotation_manager_v1* aXdgDbusAnnotationManager);
   void SetFractionalScaleManager(wp_fractional_scale_manager_v1* aManager) {
     mFractionalScaleManager = aManager;
   }
@@ -84,6 +90,7 @@ class nsWaylandDisplay {
   wp_viewporter* mViewporter = nullptr;
   zwp_linux_dmabuf_v1* mDmabuf = nullptr;
   xdg_activation_v1* mXdgActivation = nullptr;
+  xdg_dbus_annotation_manager_v1* mXdgDbusAnnotationManager = nullptr;
   wp_fractional_scale_manager_v1* mFractionalScaleManager = nullptr;
   bool mExplicitSync = false;
   bool mIsPrimarySelectionEnabled = false;
diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
index 8185c7bda9..e84044990c 100644
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -100,6 +100,7 @@
 #include "ScreenHelperGTK.h"
 #include "SystemTimeConverter.h"
 #include "WidgetUtilsGtk.h"
+#include "NativeMenuGtk.h"
 
 #ifdef ACCESSIBILITY
 #  include "mozilla/a11y/LocalAccessible.h"
@@ -182,8 +183,6 @@ static nsWindow* get_window_for_gtk_widget(GtkWidget* widget);
 static nsWindow* get_window_for_gdk_window(GdkWindow* window);
 static GtkWidget* get_gtk_widget_for_gdk_window(GdkWindow* window);
 static GdkCursor* get_gtk_cursor(nsCursor aCursor);
-static GdkWindow* get_inner_gdk_window(GdkWindow* aWindow, gint x, gint y,
-                                       gint* retx, gint* rety);
 
 /* callbacks from widgets */
 static gboolean expose_event_cb(GtkWidget* widget, cairo_t* cr);
@@ -404,6 +403,7 @@ nsWindow::nsWindow()
       mIsDragPopup(false),
       mCompositedScreen(gdk_screen_is_composited(gdk_screen_get_default())),
       mIsAccelerated(false),
+      mIsAlert(false),
       mWindowShouldStartDragging(false),
       mHasMappedToplevel(false),
       mRetryPointerGrab(false),
@@ -572,21 +572,6 @@ bool nsWindow::AreBoundsSane() {
   return !mLastSizeRequest.IsEmpty();
 }
 
-// Walk the list of child windows and call destroy on them.
-void nsWindow::DestroyChildWindows() {
-  LOG("nsWindow::DestroyChildWindows()");
-  if (!mGdkWindow) {
-    return;
-  }
-  while (GList* children = gdk_window_peek_children(mGdkWindow)) {
-    GdkWindow* child = GDK_WINDOW(children->data);
-    nsWindow* kid = get_window_for_gdk_window(child);
-    if (kid) {
-      kid->Destroy();
-    }
-  }
-}
-
 void nsWindow::Destroy() {
   MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
 
@@ -4141,6 +4126,16 @@ void nsWindow::OnUnmap() {
       mSourceDragContext = nullptr;
     }
   }
+
+  // We don't have valid XWindow any more,
+  // so clear stored ones at GtkCompositorWidget() for OMTC rendering
+  // and mSurfaceProvider for legacy rendering.
+  if (GdkIsX11Display()) {
+    mSurfaceProvider.CleanupResources();
+    if (mCompositorWidgetDelegate) {
+      mCompositorWidgetDelegate->DisableRendering();
+    }
+  }
 }
 
 void nsWindow::OnSizeAllocate(GtkAllocation* aAllocation) {
@@ -5394,6 +5389,7 @@ void nsWindow::OnDPIChanged() {
     }
     mWidgetListener->UIResolutionChanged();
   }
+  NotifyAPZOfDPIChange();
 }
 
 void nsWindow::OnCheckResize() { mPendingConfigures++; }
@@ -5427,6 +5423,8 @@ void nsWindow::OnScaleChanged(bool aNotify) {
     return;
   }
 
+  NotifyAPZOfDPIChange();
+
   LOG("OnScaleChanged %d, %f -> %d, %f\n", int(mCeiledScaleFactor),
       mFractionalScaleFactor, newCeiled, newFractional);
 
@@ -5816,9 +5814,6 @@ void nsWindow::EnsureGdkWindow() {
   if (!mGdkWindow) {
     mGdkWindow = gtk_widget_get_window(GTK_WIDGET(mContainer));
     g_object_set_data(G_OBJECT(mGdkWindow), "nsWindow", this);
-    if (mIMContext) {
-      mIMContext->SetGdkWindow(mGdkWindow);
-    }
   }
 }
 
@@ -5871,13 +5866,13 @@ void nsWindow::ConfigureGdkWindow() {
   EnsureGdkWindow();
   OnScaleChanged(/* aNotify = */ false);
 
+  if (mIsAlert) {
+    gdk_window_set_override_redirect(mGdkWindow, TRUE);
+  }
+
 #ifdef MOZ_X11
   if (GdkIsX11Display()) {
-    GdkVisual* gdkVisual = gdk_window_get_visual(mGdkWindow);
-    Visual* visual = gdk_x11_visual_get_xvisual(gdkVisual);
-    int depth = gdk_visual_get_depth(gdkVisual);
-    mSurfaceProvider.Initialize(GetX11Window(), visual, depth,
-                                GetShapedState());
+    mSurfaceProvider.Initialize(GetX11Window(), GetShapedState());
 
     // Set window manager hint to keep fullscreen windows composited.
     //
@@ -6019,6 +6014,7 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
   // and can be changed so we use WaylandPopupIsPermanent() to get
   // recent popup config (Bug 1728952).
   mNoAutoHide = aInitData && aInitData->mNoAutoHide;
+  mIsAlert = aInitData && aInitData->mIsAlert;
 
   // Popups that are not noautohide are only temporary. The are used
   // for menus and the like and disappear when another window is used.
@@ -6108,10 +6104,11 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
   if (mIsPIPWindow) {
     LOG("    Is PIP window\n");
     gtk_window_set_type_hint(GTK_WINDOW(mShell), GDK_WINDOW_TYPE_HINT_UTILITY);
-  } else if (aInitData && aInitData->mIsAlert) {
+  } else if (mIsAlert) {
     LOG("    Is alert window\n");
     gtk_window_set_type_hint(GTK_WINDOW(mShell),
                              GDK_WINDOW_TYPE_HINT_NOTIFICATION);
+    gtk_window_set_skip_taskbar_hint(GTK_WINDOW(mShell), TRUE);
   } else if (mWindowType == WindowType::Dialog) {
     mGtkWindowRoleName = "Dialog";
 
@@ -6706,10 +6703,6 @@ void nsWindow::ResumeCompositorImpl() {
   LOG("nsWindow::ResumeCompositorImpl()\n");
 
   MOZ_DIAGNOSTIC_ASSERT(mCompositorWidgetDelegate);
-
-  // DisableRendering() clears stored X11Window so we're sure EnableRendering()
-  // really updates it.
-  mCompositorWidgetDelegate->DisableRendering();
   mCompositorWidgetDelegate->EnableRendering(GetX11Window(), GetShapedState());
 
   // As WaylandStartVsync needs mCompositorWidgetDelegate this is the right
@@ -6988,6 +6981,13 @@ void nsWindow::UpdateWindowDraggingRegion(
   }
 }
 
+#ifdef MOZ_ENABLE_DBUS
+void nsWindow::SetDBusMenuBar(
+    RefPtr<mozilla::widget::DBusMenuBar> aDbusMenuBar) {
+  mDBusMenuBar = std::move(aDbusMenuBar);
+}
+#endif
+
 LayoutDeviceIntCoord nsWindow::GetTitlebarRadius() {
   MOZ_RELEASE_ASSERT(NS_IsMainThread());
   int32_t cssCoord = LookAndFeel::GetInt(LookAndFeel::IntID::TitlebarRadius);
@@ -7839,14 +7839,246 @@ static GtkWidget* get_gtk_widget_for_gdk_window(GdkWindow* window) {
   return GTK_WIDGET(user_data);
 }
 
-static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
+static GdkCursor* get_gtk_cursor_from_type(uint8_t aCursorType) {
+  GdkDisplay* defaultDisplay = gdk_display_get_default();
   GdkCursor* gdkcursor = nullptr;
-  uint8_t newType = 0xff;
 
-  if ((gdkcursor = gCursorCache[aCursor])) {
-    return gdkcursor;
+  // GtkCursors are defined at nsGtkCursors.h
+  if (aCursorType > MOZ_CURSOR_NONE) {
+    return nullptr;
   }
 
+  // If by now we don't have a xcursor, this means we have to make a custom
+  // one. First, we try creating a named cursor based on the hash of our
+  // custom bitmap, as libXcursor has some magic to convert bitmapped cursors
+  // to themed cursors
+  if (GtkCursors[aCursorType].hash) {
+    gdkcursor =
+        gdk_cursor_new_from_name(defaultDisplay, GtkCursors[aCursorType].hash);
+    if (gdkcursor) {
+      return gdkcursor;
+    }
+  }
+
+  LOGW("get_gtk_cursor_from_type(): Failed to get cursor type %d, try bitmap",
+       aCursorType);
+
+  // If we still don't have a xcursor, we now really create a bitmap cursor
+  GdkPixbuf* cursor_pixbuf =
+      gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, 32, 32);
+  if (!cursor_pixbuf) {
+    return nullptr;
+  }
+
+  guchar* data = gdk_pixbuf_get_pixels(cursor_pixbuf);
+
+  // Read data from GtkCursors and compose RGBA surface from 1bit bitmap and
+  // mask GtkCursors bits and mask are 32x32 monochrome bitmaps (1 bit for
+  // each pixel) so it's 128 byte array (4 bytes for are one bitmap row and
+  // there are 32 rows here).
+  const unsigned char* bits = GtkCursors[aCursorType].bits;
+  const unsigned char* mask_bits = GtkCursors[aCursorType].mask_bits;
+
+  for (int i = 0; i < 128; i++) {
+    char bit = (char)*bits++;
+    char mask = (char)*mask_bits++;
+    for (int j = 0; j < 8; j++) {
+      unsigned char pix = ~(((bit >> j) & 0x01) * 0xff);
+      *data++ = pix;
+      *data++ = pix;
+      *data++ = pix;
+      *data++ = (((mask >> j) & 0x01) * 0xff);
+    }
+  }
+
+  gdkcursor = gdk_cursor_new_from_pixbuf(
+      gdk_display_get_default(), cursor_pixbuf, GtkCursors[aCursorType].hot_x,
+      GtkCursors[aCursorType].hot_y);
+
+  g_object_unref(cursor_pixbuf);
+  return gdkcursor;
+}
+
+static GdkCursor* get_gtk_cursor_legacy(nsCursor aCursor) {
+  GdkCursor* gdkcursor = nullptr;
+  Maybe<uint8_t> fallbackType;
+
+  GdkDisplay* defaultDisplay = gdk_display_get_default();
+
+  // The strategy here is to use standard GDK cursors, and, if not available,
+  // load by standard name with gdk_cursor_new_from_name.
+  // Spec is here: http://www.freedesktop.org/wiki/Specifications/cursor-spec/
+  switch (aCursor) {
+    case eCursor_standard:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_LEFT_PTR);
+      break;
+    case eCursor_wait:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_WATCH);
+      break;
+    case eCursor_select:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_XTERM);
+      break;
+    case eCursor_hyperlink:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_HAND2);
+      break;
+    case eCursor_n_resize:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_TOP_SIDE);
+      break;
+    case eCursor_s_resize:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_BOTTOM_SIDE);
+      break;
+    case eCursor_w_resize:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_LEFT_SIDE);
+      break;
+    case eCursor_e_resize:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_RIGHT_SIDE);
+      break;
+    case eCursor_nw_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_TOP_LEFT_CORNER);
+      break;
+    case eCursor_se_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_BOTTOM_RIGHT_CORNER);
+      break;
+    case eCursor_ne_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_TOP_RIGHT_CORNER);
+      break;
+    case eCursor_sw_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_BOTTOM_LEFT_CORNER);
+      break;
+    case eCursor_crosshair:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_CROSSHAIR);
+      break;
+    case eCursor_move:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_FLEUR);
+      break;
+    case eCursor_help:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_QUESTION_ARROW);
+      break;
+    case eCursor_copy:  // CSS3
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "copy");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_COPY);
+      break;
+    case eCursor_alias:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "alias");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ALIAS);
+      break;
+    case eCursor_context_menu:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "context-menu");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_CONTEXT_MENU);
+      break;
+    case eCursor_cell:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_PLUS);
+      break;
+    // Those two aren’t standardized. Trying both KDE’s and GNOME’s names
+    case eCursor_grab:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "openhand");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_HAND_GRAB);
+      break;
+    case eCursor_grabbing:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "closedhand");
+      if (!gdkcursor) {
+        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "grabbing");
+      }
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_HAND_GRABBING);
+      break;
+    case eCursor_spinning:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "progress");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_SPINNING);
+      break;
+    case eCursor_zoom_in:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "zoom-in");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ZOOM_IN);
+      break;
+    case eCursor_zoom_out:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "zoom-out");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ZOOM_OUT);
+      break;
+    case eCursor_not_allowed:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "not-allowed");
+      if (!gdkcursor) {  // nonstandard, yet common
+        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "crossed_circle");
+      }
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NOT_ALLOWED);
+      break;
+    case eCursor_no_drop:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "no-drop");
+      if (!gdkcursor) {  // this nonstandard sequence makes it work on KDE and
+                         // GNOME
+        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "forbidden");
+      }
+      if (!gdkcursor) {
+        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "circle");
+      }
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NOT_ALLOWED);
+      break;
+    case eCursor_vertical_text:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "vertical-text");
+      if (!gdkcursor) {
+        fallbackType.emplace(MOZ_CURSOR_VERTICAL_TEXT);
+      }
+      break;
+    case eCursor_all_scroll:
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_FLEUR);
+      break;
+    case eCursor_nesw_resize:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "size_bdiag");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NESW_RESIZE);
+      break;
+    case eCursor_nwse_resize:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "size_fdiag");
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NWSE_RESIZE);
+      break;
+    case eCursor_ns_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_SB_V_DOUBLE_ARROW);
+      break;
+    case eCursor_ew_resize:
+      gdkcursor =
+          gdk_cursor_new_for_display(defaultDisplay, GDK_SB_H_DOUBLE_ARROW);
+      break;
+    // Here, two better fitting cursors exist in some cursor themes. Try those
+    // first
+    case eCursor_row_resize:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "split_v");
+      if (!gdkcursor) {
+        gdkcursor =
+            gdk_cursor_new_for_display(defaultDisplay, GDK_SB_V_DOUBLE_ARROW);
+      }
+      break;
+    case eCursor_col_resize:
+      gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "split_h");
+      if (!gdkcursor) {
+        gdkcursor =
+            gdk_cursor_new_for_display(defaultDisplay, GDK_SB_H_DOUBLE_ARROW);
+      }
+      break;
+    case eCursor_none:
+      fallbackType.emplace(MOZ_CURSOR_NONE);
+      break;
+    default:
+      NS_ASSERTION(aCursor, "Invalid cursor type");
+      gdkcursor = gdk_cursor_new_for_display(defaultDisplay, GDK_LEFT_PTR);
+      break;
+  }
+
+  if (!gdkcursor && fallbackType.isSome()) {
+    LOGW("get_gtk_cursor_legacy(): Failed to get cursor %d, try fallback",
+         aCursor);
+    gdkcursor = get_gtk_cursor_from_type(*fallbackType);
+  }
+
+  return gdkcursor;
+}
+
+static GdkCursor* get_gtk_cursor_from_name(nsCursor aCursor) {
+  GdkCursor* gdkcursor = nullptr;
+  Maybe<uint8_t> fallbackType;
+
   GdkDisplay* defaultDisplay = gdk_display_get_default();
 
   switch (aCursor) {
@@ -7897,42 +8129,42 @@ static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
       break;
     case eCursor_copy:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "copy");
-      if (!gdkcursor) newType = MOZ_CURSOR_COPY;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_COPY);
       break;
     case eCursor_alias:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "alias");
-      if (!gdkcursor) newType = MOZ_CURSOR_ALIAS;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ALIAS);
       break;
     case eCursor_context_menu:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "context-menu");
-      if (!gdkcursor) newType = MOZ_CURSOR_CONTEXT_MENU;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_CONTEXT_MENU);
       break;
     case eCursor_cell:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "cell");
       break;
     case eCursor_grab:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "grab");
-      if (!gdkcursor) newType = MOZ_CURSOR_HAND_GRAB;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_HAND_GRAB);
       break;
     case eCursor_grabbing:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "grabbing");
-      if (!gdkcursor) newType = MOZ_CURSOR_HAND_GRABBING;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_HAND_GRABBING);
       break;
     case eCursor_spinning:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "progress");
-      if (!gdkcursor) newType = MOZ_CURSOR_SPINNING;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_SPINNING);
       break;
     case eCursor_zoom_in:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "zoom-in");
-      if (!gdkcursor) newType = MOZ_CURSOR_ZOOM_IN;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ZOOM_IN);
       break;
     case eCursor_zoom_out:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "zoom-out");
-      if (!gdkcursor) newType = MOZ_CURSOR_ZOOM_OUT;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_ZOOM_OUT);
       break;
     case eCursor_not_allowed:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "not-allowed");
-      if (!gdkcursor) newType = MOZ_CURSOR_NOT_ALLOWED;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NOT_ALLOWED);
       break;
     case eCursor_no_drop:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "no-drop");
@@ -7943,12 +8175,12 @@ static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
       if (!gdkcursor) {
         gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "circle");
       }
-      if (!gdkcursor) newType = MOZ_CURSOR_NOT_ALLOWED;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NOT_ALLOWED);
       break;
     case eCursor_vertical_text:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "vertical-text");
       if (!gdkcursor) {
-        newType = MOZ_CURSOR_VERTICAL_TEXT;
+        fallbackType.emplace(MOZ_CURSOR_VERTICAL_TEXT);
       }
       break;
     case eCursor_all_scroll:
@@ -7956,11 +8188,11 @@ static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
       break;
     case eCursor_nesw_resize:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "nesw-resize");
-      if (!gdkcursor) newType = MOZ_CURSOR_NESW_RESIZE;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NESW_RESIZE);
       break;
     case eCursor_nwse_resize:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "nwse-resize");
-      if (!gdkcursor) newType = MOZ_CURSOR_NWSE_RESIZE;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NWSE_RESIZE);
       break;
     case eCursor_ns_resize:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "ns-resize");
@@ -7976,7 +8208,7 @@ static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
       break;
     case eCursor_none:
       gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "none");
-      if (!gdkcursor) newType = MOZ_CURSOR_NONE;
+      if (!gdkcursor) fallbackType.emplace(MOZ_CURSOR_NONE);
       break;
     default:
       NS_ASSERTION(aCursor, "Invalid cursor type");
@@ -7984,51 +8216,26 @@ static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
       break;
   }
 
-  // If by now we don't have a xcursor, this means we have to make a custom
-  // one. First, we try creating a named cursor based on the hash of our
-  // custom bitmap, as libXcursor has some magic to convert bitmapped cursors
-  // to themed cursors
-  if (newType != 0xFF && GtkCursors[newType].hash) {
-    gdkcursor =
-        gdk_cursor_new_from_name(defaultDisplay, GtkCursors[newType].hash);
+  if (!gdkcursor && fallbackType.isSome()) {
+    LOGW("get_gtk_cursor_from_name(): Failed to get cursor %d, try fallback",
+         aCursor);
+    gdkcursor = get_gtk_cursor_from_type(*fallbackType);
   }
 
-  // If we still don't have a xcursor, we now really create a bitmap cursor
-  if (newType != 0xff && !gdkcursor) {
-    GdkPixbuf* cursor_pixbuf =
-        gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, 32, 32);
-    if (!cursor_pixbuf) {
-      return nullptr;
-    }
-
-    guchar* data = gdk_pixbuf_get_pixels(cursor_pixbuf);
-
-    // Read data from GtkCursors and compose RGBA surface from 1bit bitmap and
-    // mask GtkCursors bits and mask are 32x32 monochrome bitmaps (1 bit for
-    // each pixel) so it's 128 byte array (4 bytes for are one bitmap row and
-    // there are 32 rows here).
-    const unsigned char* bits = GtkCursors[newType].bits;
-    const unsigned char* mask_bits = GtkCursors[newType].mask_bits;
-
-    for (int i = 0; i < 128; i++) {
-      char bit = (char)*bits++;
-      char mask = (char)*mask_bits++;
-      for (int j = 0; j < 8; j++) {
-        unsigned char pix = ~(((bit >> j) & 0x01) * 0xff);
-        *data++ = pix;
-        *data++ = pix;
-        *data++ = pix;
-        *data++ = (((mask >> j) & 0x01) * 0xff);
-      }
-    }
+  return gdkcursor;
+}
 
-    gdkcursor = gdk_cursor_new_from_pixbuf(
-        gdk_display_get_default(), cursor_pixbuf, GtkCursors[newType].hot_x,
-        GtkCursors[newType].hot_y);
+static GdkCursor* get_gtk_cursor(nsCursor aCursor) {
+  GdkCursor* gdkcursor = nullptr;
 
-    g_object_unref(cursor_pixbuf);
+  if ((gdkcursor = gCursorCache[aCursor])) {
+    return gdkcursor;
   }
 
+  gdkcursor = StaticPrefs::widget_gtk_legacy_cursors_enabled()
+                  ? get_gtk_cursor_legacy(aCursor)
+                  : get_gtk_cursor_from_name(aCursor);
+
   gCursorCache[aCursor] = gdkcursor;
 
   return gdkcursor;
@@ -8214,6 +8421,10 @@ static gboolean button_press_event_cb(GtkWidget* widget,
                                       GdkEventButton* event) {
   UpdateLastInputEventTime(event);
 
+  if (event->button == 2 && !StaticPrefs::widget_gtk_middle_click_enabled()) {
+    return FALSE;
+  }
+
   RefPtr<nsWindow> window = GetFirstNSWindowForGDKWindow(event->window);
   if (!window) {
     return FALSE;
@@ -8232,6 +8443,10 @@ static gboolean button_release_event_cb(GtkWidget* widget,
                                         GdkEventButton* event) {
   UpdateLastInputEventTime(event);
 
+  if (event->button == 2 && !StaticPrefs::widget_gtk_middle_click_enabled()) {
+    return FALSE;
+  }
+
   RefPtr<nsWindow> window = GetFirstNSWindowForGDKWindow(event->window);
   if (!window) {
     return FALSE;
@@ -8579,28 +8794,26 @@ gboolean WindowDragMotionHandler(GtkWidget* aWidget,
                                  GdkDragContext* aDragContext, gint aX, gint aY,
                                  guint aTime) {
   RefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
-  if (!window) {
+  if (!window || !window->GetGdkWindow()) {
     return FALSE;
   }
 
-  // figure out which internal widget this drag motion actually happened on
-  nscoord retx = 0;
-  nscoord rety = 0;
-
-  GdkWindow* innerWindow = get_inner_gdk_window(gtk_widget_get_window(aWidget),
-                                                aX, aY, &retx, &rety);
-  RefPtr<nsWindow> innerMostWindow = get_window_for_gdk_window(innerWindow);
-  if (!innerMostWindow) {
-    innerMostWindow = window;
+  // We're getting aX,aY in mShell coordinates space.
+  // mContainer is shifted by CSD decorations so translate the coords
+  // to mContainer space where our content lives.
+  if (aWidget == window->GetGtkWidget()) {
+    int x, y;
+    gdk_window_get_geometry(window->GetGdkWindow(), &x, &y, nullptr, nullptr);
+    aX -= x;
+    aY -= y;
   }
-  LOGDRAG("WindowDragMotionHandler target nsWindow [%p]",
-          innerMostWindow.get());
+
+  LOGDRAG("WindowDragMotionHandler target nsWindow [%p]", window.get());
 
   RefPtr<nsDragService> dragService = nsDragService::GetInstance();
   nsDragService::AutoEventLoop loop(dragService);
   if (!dragService->ScheduleMotionEvent(
-          innerMostWindow, aDragContext,
-          GetWindowDropPosition(innerMostWindow, retx, rety), aTime)) {
+          window, aDragContext, GetWindowDropPosition(window, aX, aY), aTime)) {
     return FALSE;
   }
   return TRUE;
@@ -8656,28 +8869,25 @@ static void drag_leave_event_cb(GtkWidget* aWidget,
 gboolean WindowDragDropHandler(GtkWidget* aWidget, GdkDragContext* aDragContext,
                                gint aX, gint aY, guint aTime) {
   RefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
-  if (!window) {
+  if (!window || !window->GetGdkWindow()) {
     return FALSE;
   }
 
-  // figure out which internal widget this drag motion actually happened on
-  nscoord retx = 0;
-  nscoord rety = 0;
-
-  GdkWindow* innerWindow = get_inner_gdk_window(gtk_widget_get_window(aWidget),
-                                                aX, aY, &retx, &rety);
-  RefPtr<nsWindow> innerMostWindow = get_window_for_gdk_window(innerWindow);
-
-  if (!innerMostWindow) {
-    innerMostWindow = window;
+  // We're getting aX,aY in mShell coordinates space.
+  // mContainer is shifted by CSD decorations so translate the coords
+  // to mContainer space where our content lives.
+  if (aWidget == window->GetGtkWidget()) {
+    int x, y;
+    gdk_window_get_geometry(window->GetGdkWindow(), &x, &y, nullptr, nullptr);
+    aX -= x;
+    aY -= y;
   }
 
-  LOGDRAG("WindowDragDropHandler nsWindow [%p]", innerMostWindow.get());
+  LOGDRAG("WindowDragDropHandler nsWindow [%p]", window.get());
   RefPtr<nsDragService> dragService = nsDragService::GetInstance();
   nsDragService::AutoEventLoop loop(dragService);
   return dragService->ScheduleDropEvent(
-      innerMostWindow, aDragContext,
-      GetWindowDropPosition(innerMostWindow, retx, rety), aTime);
+      window, aDragContext, GetWindowDropPosition(window, aX, aY), aTime);
 }
 
 static gboolean drag_drop_event_cb(GtkWidget* aWidget,
@@ -8710,27 +8920,6 @@ static nsresult initialize_prefs(void) {
   return NS_OK;
 }
 
-// TODO: Can we simplify it for mShell/mContainer only scenario?
-static GdkWindow* get_inner_gdk_window(GdkWindow* aWindow, gint x, gint y,
-                                       gint* retx, gint* rety) {
-  gint cx, cy, cw, ch;
-  GList* children = gdk_window_peek_children(aWindow);
-  for (GList* child = g_list_last(children); child;
-       child = g_list_previous(child)) {
-    auto* childWindow = (GdkWindow*)child->data;
-    if (get_window_for_gdk_window(childWindow)) {
-      gdk_window_get_geometry(childWindow, &cx, &cy, &cw, &ch);
-      if ((cx < x) && (x < (cx + cw)) && (cy < y) && (y < (cy + ch)) &&
-          gdk_window_is_visible(childWindow)) {
-        return get_inner_gdk_window(childWindow, x - cx, y - cy, retx, rety);
-      }
-    }
-  }
-  *retx = x;
-  *rety = y;
-  return aWindow;
-}
-
 #ifdef ACCESSIBILITY
 void nsWindow::CreateRootAccessible() {
   if (!mRootAccessible) {
@@ -9548,8 +9737,19 @@ void nsWindow::GetCompositorWidgetInitData(
 
   LOG("nsWindow::GetCompositorWidgetInitData");
 
+  Window window = GetX11Window();
+#ifdef MOZ_X11
+  // We're bit hackish here. Old GLX backend needs XWindow when GLContext
+  // is created so get XWindow now before map signal.
+  // We may see crashes/errors when nsWindow is unmapped (XWindow is
+  // invalidated) but we can't do anything about it.
+  if (!window && !gfxVars::UseEGL()) {
+    window =
+        gdk_x11_window_get_xid(gtk_widget_get_window(GTK_WIDGET(mContainer)));
+  }
+#endif
   *aInitData = mozilla::widget::GtkCompositorWidgetInitData(
-      GetX11Window(), displayName, GetShapedState(), GdkIsX11Display(),
+      window, displayName, GetShapedState(), GdkIsX11Display(),
       GetClientSize());
 
 #ifdef MOZ_X11
@@ -9927,38 +10127,42 @@ void nsWindow::DisableRendering() {
   LOG("nsWindow::DisableRendering()");
 
   if (mGdkWindow) {
-    if (mIMContext) {
-      mIMContext->SetGdkWindow(nullptr);
-    }
     g_object_set_data(G_OBJECT(mGdkWindow), "nsWindow", nullptr);
     mGdkWindow = nullptr;
   }
 
+  // Until Bug 1654938 is fixed we delete layer manager for hidden popups,
+  // otherwise it can easily hold 1GB+ memory for long time.
+  if (mWindowType == WindowType::Popup) {
+    DestroyLayerManager();
+    mSurfaceProvider.CleanupResources();
+  } else {
 #ifdef MOZ_WAYLAND
-  // Widget is backed by OpenGL EGLSurface created over wl_surface
-  // owned by mContainer.
-  // RenderCompositorEGL::Resume() deletes recent EGLSurface based on
-  // wl_surface owned by mContainer and creates a new fallback EGLSurface.
-  // Then we can delete wl_surface in moz_container_wayland_unmap().
-  // We don't want to pause compositor as it may lead to whole
-  // browser freeze (Bug 1777664).
-  ///
-  // We don't need to do such operation for SW backend as
-  // WindowSurfaceWaylandMB::Commit() gets wl_surface from
-  // MozContainer every commit.
-  if (moz_container_wayland_has_egl_window(mContainer) &&
-      mCompositorWidgetDelegate) {
-    if (CompositorBridgeChild* remoteRenderer = GetRemoteRenderer()) {
-      // Call DisableRendering() to make GtkCompositorWidget hidden.
-      // Then SendResume() will create fallback EGLSurface, see
-      // GLContextEGL::CreateEGLSurfaceForCompositorWidget().
-      mCompositorWidgetDelegate->DisableRendering();
-      remoteRenderer->SendResume();
-      mCompositorWidgetDelegate->EnableRendering(GetX11Window(),
-                                                 GetShapedState());
+    // Widget is backed by OpenGL EGLSurface created over wl_surface
+    // owned by mContainer.
+    // RenderCompositorEGL::Resume() deletes recent EGLSurface based on
+    // wl_surface owned by mContainer and creates a new fallback EGLSurface.
+    // Then we can delete wl_surface in moz_container_wayland_unmap().
+    // We don't want to pause compositor as it may lead to whole
+    // browser freeze (Bug 1777664).
+    ///
+    // We don't need to do such operation for SW backend as
+    // WindowSurfaceWaylandMB::Commit() gets wl_surface from
+    // MozContainer every commit.
+    if (moz_container_wayland_has_egl_window(mContainer) &&
+        mCompositorWidgetDelegate) {
+      if (CompositorBridgeChild* remoteRenderer = GetRemoteRenderer()) {
+        // Call DisableRendering() to make GtkCompositorWidget hidden.
+        // Then SendResume() will create fallback EGLSurface, see
+        // GLContextEGL::CreateEGLSurfaceForCompositorWidget().
+        mCompositorWidgetDelegate->DisableRendering();
+        remoteRenderer->SendResume();
+        mCompositorWidgetDelegate->EnableRendering(GetX11Window(),
+                                                   GetShapedState());
+      }
     }
-  }
 #endif
+  }
 }
 
 // Apply workaround for Mutter compositor bug (mzbz#1777269).
diff --git a/widget/gtk/nsWindow.h b/widget/gtk/nsWindow.h
index e235d12c08..f8fe344f09 100644
--- a/widget/gtk/nsWindow.h
+++ b/widget/gtk/nsWindow.h
@@ -113,6 +113,7 @@ class CurrentX11TimeGetter;
 #endif
 
 namespace widget {
+class DBusMenuBar;
 class Screen;
 }  // namespace widget
 }  // namespace mozilla
@@ -373,6 +374,10 @@ class nsWindow final : public nsBaseWidget {
   void UpdateWindowDraggingRegion(
       const LayoutDeviceIntRegion& aRegion) override;
 
+#ifdef MOZ_ENABLE_DBUS
+  void SetDBusMenuBar(RefPtr<mozilla::widget::DBusMenuBar> aDbusMenuBar);
+#endif
+
   // HiDPI scale conversion
   gint GdkCeiledScaleFactor();
   double FractionalScaleFactor();
@@ -654,6 +659,7 @@ class nsWindow final : public nsBaseWidget {
   bool mIsDragPopup : 1;
   bool mCompositedScreen : 1;
   bool mIsAccelerated : 1;
+  bool mIsAlert : 1;
   bool mWindowShouldStartDragging : 1;
   bool mHasMappedToplevel : 1;
   bool mRetryPointerGrab : 1;
@@ -904,6 +910,10 @@ class nsWindow final : public nsBaseWidget {
   RefPtr<nsWindow> mWaylandPopupNext;
   RefPtr<nsWindow> mWaylandPopupPrev;
 
+#ifdef MOZ_ENABLE_DBUS
+  RefPtr<mozilla::widget::DBusMenuBar> mDBusMenuBar;
+#endif
+
   // When popup is resized by Gtk by move-to-rect callback,
   // we store final popup size here. Then we use mMoveToRectPopupSize size
   // in following popup operations unless mLayoutPopupSizeCleared is set.
diff --git a/widget/gtk/wayland/moz.build b/widget/gtk/wayland/moz.build
index e033187a3b..b9ea6a4f70 100644
--- a/widget/gtk/wayland/moz.build
+++ b/widget/gtk/wayland/moz.build
@@ -15,6 +15,7 @@ SOURCES += [
     "relative-pointer-unstable-v1-protocol.c",
     "viewporter-protocol.c",
     "xdg-activation-v1-protocol.c",
+    "xdg-dbus-annotation-v1-protocol.c",
     "xdg-output-unstable-v1-protocol.c",
 ]
 
@@ -26,6 +27,7 @@ EXPORTS.mozilla.widget += [
     "relative-pointer-unstable-v1-client-protocol.h",
     "viewporter-client-protocol.h",
     "xdg-activation-v1-client-protocol.h",
+    "xdg-dbus-annotation-v1-client-protocol.h",
     "xdg-output-unstable-v1-client-protocol.h",
 ]
 
diff --git a/widget/gtk/wayland/xdg-dbus-annotation-v1-client-protocol.h b/widget/gtk/wayland/xdg-dbus-annotation-v1-client-protocol.h
new file mode 100644
index 0000000000..fe5567cf8e
--- /dev/null
+++ b/widget/gtk/wayland/xdg-dbus-annotation-v1-client-protocol.h
@@ -0,0 +1,284 @@
+/* Generated by wayland-scanner 1.19.0 */
+
+#ifndef XDG_DBUS_ANNOTATION_V1_CLIENT_PROTOCOL_H
+#define XDG_DBUS_ANNOTATION_V1_CLIENT_PROTOCOL_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "wayland-client.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @page page_xdg_dbus_annotation_v1 The xdg_dbus_annotation_v1 protocol
+ * Wayland protocol for associating DBus objects with toplevels
+ *
+ * @section page_desc_xdg_dbus_annotation_v1 Description
+ *
+ * This description provides a high-level overview of the interplay between
+ * the interfaces defined in this protocol. For details, see the protocol
+ * specification.
+ *
+ * The dbus_annotation_manager allows a client to request the creation of an
+ * annotation object associated with an wl_surface or itself. The annotation
+ * object allows a client to notify the compositor of a DBus object associated
+ * with itself.
+ *
+ * Clients should request the creation of an dbus_annotation object when they
+ * create a DBus object associated with an wl_surface or themselves, and should
+ * release the object when they destroy a DBus object associated with their
+ * wl_surface or themselves.
+ *
+ * Clients should only own at most one dbus_annotation object with a given name
+ * for each of their wl_surface objects or themselves. A protocol error will be
+ * raised if a client requests more than one dbus_annotation object for an
+ * wl_surface or themselves with a given name.
+ *
+ * @section page_ifaces_xdg_dbus_annotation_v1 Interfaces
+ * - @subpage page_iface_xdg_dbus_annotation_manager_v1 - controller object for
+ * registering dbus objects associated with wl_surfaces or clients
+ * - @subpage page_iface_xdg_dbus_annotation_v1 - controller object for
+ * associating dbus objects with an wl_surface
+ * @section page_copyright_xdg_dbus_annotation_v1 Copyright
+ * <pre>
+ *
+ * Copyright © 2017 David Edmundson
+ * Copyrihgt © 2023 Janet Blackquill
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ * </pre>
+ */
+struct wl_surface;
+struct xdg_dbus_annotation_manager_v1;
+struct xdg_dbus_annotation_v1;
+
+#ifndef XDG_DBUS_ANNOTATION_MANAGER_V1_INTERFACE
+#  define XDG_DBUS_ANNOTATION_MANAGER_V1_INTERFACE
+/**
+ * @page page_iface_xdg_dbus_annotation_manager_v1
+ * xdg_dbus_annotation_manager_v1
+ * @section page_iface_xdg_dbus_annotation_manager_v1_desc Description
+ *
+ * An object that provides access to the creation of dbus_annotation objects.
+ * @section page_iface_xdg_dbus_annotation_manager_v1_api API
+ * See @ref iface_xdg_dbus_annotation_manager_v1.
+ */
+/**
+ * @defgroup iface_xdg_dbus_annotation_manager_v1 The
+ * xdg_dbus_annotation_manager_v1 interface
+ *
+ * An object that provides access to the creation of dbus_annotation objects.
+ */
+extern const struct wl_interface xdg_dbus_annotation_manager_v1_interface;
+#endif
+#ifndef XDG_DBUS_ANNOTATION_V1_INTERFACE
+#  define XDG_DBUS_ANNOTATION_V1_INTERFACE
+/**
+ * @page page_iface_xdg_dbus_annotation_v1 xdg_dbus_annotation_v1
+ * @section page_iface_xdg_dbus_annotation_v1_desc Description
+ *
+ * An object that provides access to clients to notify the compositor of
+ * associated DBus objects for an wl_surface.
+ *
+ * If not applicable, clients should remove this object.
+ * @section page_iface_xdg_dbus_annotation_v1_api API
+ * See @ref iface_xdg_dbus_annotation_v1.
+ */
+/**
+ * @defgroup iface_xdg_dbus_annotation_v1 The xdg_dbus_annotation_v1 interface
+ *
+ * An object that provides access to clients to notify the compositor of
+ * associated DBus objects for an wl_surface.
+ *
+ * If not applicable, clients should remove this object.
+ */
+extern const struct wl_interface xdg_dbus_annotation_v1_interface;
+#endif
+
+#ifndef XDG_DBUS_ANNOTATION_MANAGER_V1_ERROR_ENUM
+#  define XDG_DBUS_ANNOTATION_MANAGER_V1_ERROR_ENUM
+enum xdg_dbus_annotation_manager_v1_error {
+  /**
+   * given wl_surface or client already has a dbus_annotation with the same
+   * interface
+   */
+  XDG_DBUS_ANNOTATION_MANAGER_V1_ERROR_ALREADY_ANNOTATED = 0,
+  /**
+   * given wl_surface is invalid
+   */
+  XDG_DBUS_ANNOTATION_MANAGER_V1_ERROR_BAD_TARGET = 1,
+};
+#endif /* XDG_DBUS_ANNOTATION_MANAGER_V1_ERROR_ENUM */
+
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_DESTROY 0
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_CLIENT 1
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_SURFACE 2
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ */
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_DESTROY_SINCE_VERSION 1
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ */
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_CLIENT_SINCE_VERSION 1
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ */
+#define XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_SURFACE_SINCE_VERSION 1
+
+/** @ingroup iface_xdg_dbus_annotation_manager_v1 */
+static inline void xdg_dbus_annotation_manager_v1_set_user_data(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1,
+    void* user_data) {
+  wl_proxy_set_user_data((struct wl_proxy*)xdg_dbus_annotation_manager_v1,
+                         user_data);
+}
+
+/** @ingroup iface_xdg_dbus_annotation_manager_v1 */
+static inline void* xdg_dbus_annotation_manager_v1_get_user_data(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1) {
+  return wl_proxy_get_user_data(
+      (struct wl_proxy*)xdg_dbus_annotation_manager_v1);
+}
+
+static inline uint32_t xdg_dbus_annotation_manager_v1_get_version(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1) {
+  return wl_proxy_get_version((struct wl_proxy*)xdg_dbus_annotation_manager_v1);
+}
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ *
+ * Destroy the xdg_dbus_annotation_manager object. xdg_dbus_annotation objects
+ * created from this object remain valid and should be destroyed separately.
+ */
+static inline void xdg_dbus_annotation_manager_v1_destroy(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1) {
+  wl_proxy_marshal((struct wl_proxy*)xdg_dbus_annotation_manager_v1,
+                   XDG_DBUS_ANNOTATION_MANAGER_V1_DESTROY);
+
+  wl_proxy_destroy((struct wl_proxy*)xdg_dbus_annotation_manager_v1);
+}
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ *
+ * The interface other DBus clients can expect the object specified by the
+ * annotation to implement.
+ */
+static inline struct xdg_dbus_annotation_v1*
+xdg_dbus_annotation_manager_v1_create_client(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1,
+    const char* interface) {
+  struct wl_proxy* id;
+
+  id = wl_proxy_marshal_constructor(
+      (struct wl_proxy*)xdg_dbus_annotation_manager_v1,
+      XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_CLIENT,
+      &xdg_dbus_annotation_v1_interface, interface, NULL);
+
+  return (struct xdg_dbus_annotation_v1*)id;
+}
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_manager_v1
+ *
+ * The surface to associate the annotation with
+ */
+static inline struct xdg_dbus_annotation_v1*
+xdg_dbus_annotation_manager_v1_create_surface(
+    struct xdg_dbus_annotation_manager_v1* xdg_dbus_annotation_manager_v1,
+    const char* interface, struct wl_surface* toplevel) {
+  struct wl_proxy* id;
+
+  id = wl_proxy_marshal_constructor(
+      (struct wl_proxy*)xdg_dbus_annotation_manager_v1,
+      XDG_DBUS_ANNOTATION_MANAGER_V1_CREATE_SURFACE,
+      &xdg_dbus_annotation_v1_interface, interface, NULL, toplevel);
+
+  return (struct xdg_dbus_annotation_v1*)id;
+}
+
+#define XDG_DBUS_ANNOTATION_V1_DESTROY 0
+#define XDG_DBUS_ANNOTATION_V1_SET_ADDRESS 1
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_v1
+ */
+#define XDG_DBUS_ANNOTATION_V1_DESTROY_SINCE_VERSION 1
+/**
+ * @ingroup iface_xdg_dbus_annotation_v1
+ */
+#define XDG_DBUS_ANNOTATION_V1_SET_ADDRESS_SINCE_VERSION 1
+
+/** @ingroup iface_xdg_dbus_annotation_v1 */
+static inline void xdg_dbus_annotation_v1_set_user_data(
+    struct xdg_dbus_annotation_v1* xdg_dbus_annotation_v1, void* user_data) {
+  wl_proxy_set_user_data((struct wl_proxy*)xdg_dbus_annotation_v1, user_data);
+}
+
+/** @ingroup iface_xdg_dbus_annotation_v1 */
+static inline void* xdg_dbus_annotation_v1_get_user_data(
+    struct xdg_dbus_annotation_v1* xdg_dbus_annotation_v1) {
+  return wl_proxy_get_user_data((struct wl_proxy*)xdg_dbus_annotation_v1);
+}
+
+static inline uint32_t xdg_dbus_annotation_v1_get_version(
+    struct xdg_dbus_annotation_v1* xdg_dbus_annotation_v1) {
+  return wl_proxy_get_version((struct wl_proxy*)xdg_dbus_annotation_v1);
+}
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_v1
+ */
+static inline void xdg_dbus_annotation_v1_destroy(
+    struct xdg_dbus_annotation_v1* xdg_dbus_annotation_v1) {
+  wl_proxy_marshal((struct wl_proxy*)xdg_dbus_annotation_v1,
+                   XDG_DBUS_ANNOTATION_V1_DESTROY);
+
+  wl_proxy_destroy((struct wl_proxy*)xdg_dbus_annotation_v1);
+}
+
+/**
+ * @ingroup iface_xdg_dbus_annotation_v1
+ *
+ * Set or update the service name and object path corresponding to the
+ * DBus object. The DBus object should be registered on the session bus
+ * before sending this request.
+ *
+ * Strings should be formatted in Latin-1 matching the relevant DBus
+ * specifications.
+ */
+static inline void xdg_dbus_annotation_v1_set_address(
+    struct xdg_dbus_annotation_v1* xdg_dbus_annotation_v1,
+    const char* service_name, const char* object_path) {
+  wl_proxy_marshal((struct wl_proxy*)xdg_dbus_annotation_v1,
+                   XDG_DBUS_ANNOTATION_V1_SET_ADDRESS, service_name,
+                   object_path);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/widget/gtk/wayland/xdg-dbus-annotation-v1-protocol.c b/widget/gtk/wayland/xdg-dbus-annotation-v1-protocol.c
new file mode 100644
index 0000000000..af51b3b0e8
--- /dev/null
+++ b/widget/gtk/wayland/xdg-dbus-annotation-v1-protocol.c
@@ -0,0 +1,75 @@
+/* Generated by wayland-scanner 1.19.0 */
+
+/*
+ * Copyright © 2017 David Edmundson
+ * Copyrihgt © 2023 Janet Blackquill
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include "wayland-util.h"
+
+#ifndef __has_attribute
+#  define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */
+#endif
+
+#if (__has_attribute(visibility) || defined(__GNUC__) && __GNUC__ >= 4)
+#  define WL_PRIVATE __attribute__((visibility("hidden")))
+#else
+#  define WL_PRIVATE
+#endif
+
+#pragma GCC visibility push(default)
+extern const struct wl_interface wl_surface_interface;
+#pragma GCC visibility pop
+extern const struct wl_interface xdg_dbus_annotation_v1_interface;
+
+static const struct wl_interface* xdg_dbus_annotation_v1_types[] = {
+    NULL,
+    NULL,
+    NULL,
+    &xdg_dbus_annotation_v1_interface,
+    NULL,
+    &xdg_dbus_annotation_v1_interface,
+    &wl_surface_interface,
+};
+
+static const struct wl_message xdg_dbus_annotation_manager_v1_requests[] = {
+    {"destroy", "", xdg_dbus_annotation_v1_types + 0},
+    {"create_client", "sn", xdg_dbus_annotation_v1_types + 2},
+    {"create_surface", "sno", xdg_dbus_annotation_v1_types + 4},
+};
+
+WL_PRIVATE const struct wl_interface xdg_dbus_annotation_manager_v1_interface =
+    {
+        "xdg_dbus_annotation_manager_v1",        1, 3,
+        xdg_dbus_annotation_manager_v1_requests, 0, NULL,
+};
+
+static const struct wl_message xdg_dbus_annotation_v1_requests[] = {
+    {"destroy", "", xdg_dbus_annotation_v1_types + 0},
+    {"set_address", "ss", xdg_dbus_annotation_v1_types + 0},
+};
+
+WL_PRIVATE const struct wl_interface xdg_dbus_annotation_v1_interface = {
+    "xdg_dbus_annotation_v1", 1, 2, xdg_dbus_annotation_v1_requests, 0, NULL,
+};
diff --git a/widget/headless/HeadlessLookAndFeelGTK.cpp b/widget/headless/HeadlessLookAndFeelGTK.cpp
index f8f6270cd7..462a877f34 100644
--- a/widget/headless/HeadlessLookAndFeelGTK.cpp
+++ b/widget/headless/HeadlessLookAndFeelGTK.cpp
@@ -118,9 +118,6 @@ nsresult HeadlessLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
     case IntID::ScrollbarButtonAutoRepeatBehavior:
       aResult = 0;
       break;
-    case IntID::TooltipDelay:
-      aResult = 500;
-      break;
     case IntID::SwipeAnimationEnabled:
       aResult = 0;
       break;
diff --git a/widget/headless/tests/test_headless.js b/widget/headless/tests/test_headless.js
index f9183245d2..4331cb3fe7 100644
--- a/widget/headless/tests/test_headless.js
+++ b/widget/headless/tests/test_headless.js
@@ -22,7 +22,7 @@ registerCleanupFunction(() => {
 const progressListeners = new Map();
 
 function loadContentWindow(windowlessBrowser, uri) {
-  return new Promise((resolve, reject) => {
+  return new Promise(resolve => {
     let loadURIOptions = {
       triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
     };
@@ -46,7 +46,7 @@ function loadContentWindow(windowlessBrowser, uri) {
         progressListeners.delete(progressListener);
         contentWindow.addEventListener(
           "load",
-          event => {
+          () => {
             resolve(contentWindow);
           },
           { once: true }
diff --git a/widget/moz.build b/widget/moz.build
index 54a231c67d..557db5e288 100644
--- a/widget/moz.build
+++ b/widget/moz.build
@@ -323,7 +323,7 @@ if toolkit in {"gtk", "cocoa", "windows", "android", "uikit"}:
         "nsBaseFilePicker.cpp",
     ]
 
-if toolkit in ("gtk", "windows", "cocoa", "android"):
+if toolkit in ("gtk", "windows", "cocoa", "uikit", "android"):
     UNIFIED_SOURCES += [
         "nsNativeTheme.cpp",
     ]
diff --git a/widget/nsBaseClipboard.cpp b/widget/nsBaseClipboard.cpp
index 40af1de388..333d154e70 100644
--- a/widget/nsBaseClipboard.cpp
+++ b/widget/nsBaseClipboard.cpp
@@ -812,56 +812,124 @@ NS_IMETHODIMP nsBaseClipboard::AsyncGetData(
   return NS_OK;
 }
 
-void nsBaseClipboard::AsyncGetDataInternal(
+already_AddRefed<nsIAsyncGetClipboardData>
+nsBaseClipboard::MaybeCreateGetRequestFromClipboardCache(
     const nsTArray<nsCString>& aFlavorList, int32_t aClipboardType,
-    mozilla::dom::WindowContext* aRequestingWindowContext,
-    nsIAsyncClipboardGetCallback* aCallback) {
-  MOZ_ASSERT(nsIClipboard::IsClipboardTypeSupported(aClipboardType));
+    mozilla::dom::WindowContext* aRequestingWindowContext) {
+  MOZ_DIAGNOSTIC_ASSERT(nsIClipboard::IsClipboardTypeSupported(aClipboardType));
 
-  if (mozilla::StaticPrefs::widget_clipboard_use_cached_data_enabled()) {
-    // If we were the last ones to put something on the native clipboard, then
-    // just use the cached transferable. Otherwise clear it because it isn't
-    // relevant any more.
-    if (auto* clipboardCache = GetClipboardCacheIfValid(aClipboardType)) {
-      nsITransferable* cachedTransferable = clipboardCache->GetTransferable();
-      MOZ_ASSERT(cachedTransferable);
-
-      nsTArray<nsCString> transferableFlavors;
-      if (NS_SUCCEEDED(cachedTransferable->FlavorsTransferableCanExport(
-              transferableFlavors))) {
-        nsTArray<nsCString> results;
-        for (const auto& transferableFlavor : transferableFlavors) {
-          for (const auto& flavor : aFlavorList) {
-            // XXX We need special check for image as we always put the
-            // image as "native" on the clipboard.
-            if (transferableFlavor.Equals(flavor) ||
-                (transferableFlavor.Equals(kNativeImageMime) &&
-                 nsContentUtils::IsFlavorImage(flavor))) {
-              MOZ_CLIPBOARD_LOG("    has %s", flavor.get());
-              results.AppendElement(flavor);
-            }
-          }
-        }
+  if (!mozilla::StaticPrefs::widget_clipboard_use_cached_data_enabled()) {
+    return nullptr;
+  }
+
+  // If we were the last ones to put something on the native clipboard, then
+  // just use the cached transferable. Otherwise clear it because it isn't
+  // relevant any more.
+  ClipboardCache* clipboardCache = GetClipboardCacheIfValid(aClipboardType);
+  if (!clipboardCache) {
+    return nullptr;
+  }
+
+  nsITransferable* cachedTransferable = clipboardCache->GetTransferable();
+  MOZ_ASSERT(cachedTransferable);
+
+  nsTArray<nsCString> transferableFlavors;
+  if (NS_FAILED(cachedTransferable->FlavorsTransferableCanExport(
+          transferableFlavors))) {
+    return nullptr;
+  }
 
-        // XXX Do we need to check system clipboard for the flavors that cannot
-        // be found in cache?
-        auto asyncGetClipboardData = mozilla::MakeRefPtr<AsyncGetClipboardData>(
-            aClipboardType, clipboardCache->GetSequenceNumber(),
-            std::move(results), true, this, aRequestingWindowContext);
-        aCallback->OnSuccess(asyncGetClipboardData);
-        return;
+  nsTArray<nsCString> results;
+  for (const auto& flavor : aFlavorList) {
+    for (const auto& transferableFlavor : transferableFlavors) {
+      // XXX We need special check for image as we always put the
+      // image as "native" on the clipboard.
+      if (transferableFlavor.Equals(flavor) ||
+          (transferableFlavor.Equals(kNativeImageMime) &&
+           nsContentUtils::IsFlavorImage(flavor))) {
+        MOZ_CLIPBOARD_LOG("    has %s", flavor.get());
+        results.AppendElement(flavor);
       }
     }
+  }
 
-    // At this point we can't satisfy the request from cache data so let's look
-    // for things other people put on the system clipboard.
+  // XXX Do we need to check system clipboard for the flavors that cannot
+  // be found in cache?
+  return mozilla::MakeAndAddRef<AsyncGetClipboardData>(
+      aClipboardType, clipboardCache->GetSequenceNumber(), std::move(results),
+      true /* aFromCache */, this, aRequestingWindowContext);
+}
+
+void nsBaseClipboard::AsyncGetDataInternal(
+    const nsTArray<nsCString>& aFlavorList, int32_t aClipboardType,
+    mozilla::dom::WindowContext* aRequestingWindowContext,
+    nsIAsyncClipboardGetCallback* aCallback) {
+  MOZ_ASSERT(nsIClipboard::IsClipboardTypeSupported(aClipboardType));
+
+  if (nsCOMPtr<nsIAsyncGetClipboardData> asyncGetClipboardData =
+          MaybeCreateGetRequestFromClipboardCache(aFlavorList, aClipboardType,
+                                                  aRequestingWindowContext)) {
+    aCallback->OnSuccess(asyncGetClipboardData);
+    return;
   }
 
+  // At this point we can't satisfy the request from cache data so let's
+  // look for things other people put on the system clipboard.
   MaybeRetryGetAvailableFlavors(aFlavorList, aClipboardType, aCallback,
                                 kGetAvailableFlavorsRetryCount,
                                 aRequestingWindowContext);
 }
 
+NS_IMETHODIMP nsBaseClipboard::GetDataSnapshotSync(
+    const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
+    mozilla::dom::WindowContext* aRequestingWindowContext,
+    nsIAsyncGetClipboardData** _retval) {
+  MOZ_CLIPBOARD_LOG("%s: clipboard=%d", __FUNCTION__, aWhichClipboard);
+
+  *_retval = nullptr;
+
+  if (aFlavorList.IsEmpty()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (!nsIClipboard::IsClipboardTypeSupported(aWhichClipboard)) {
+    MOZ_CLIPBOARD_LOG("%s: clipboard %d is not supported.", __FUNCTION__,
+                      aWhichClipboard);
+    return NS_ERROR_FAILURE;
+  }
+
+  if (nsCOMPtr<nsIAsyncGetClipboardData> asyncGetClipboardData =
+          MaybeCreateGetRequestFromClipboardCache(aFlavorList, aWhichClipboard,
+                                                  aRequestingWindowContext)) {
+    asyncGetClipboardData.forget(_retval);
+    return NS_OK;
+  }
+
+  auto sequenceNumberOrError =
+      GetNativeClipboardSequenceNumber(aWhichClipboard);
+  if (sequenceNumberOrError.isErr()) {
+    MOZ_CLIPBOARD_LOG("%s: unable to get sequence number for clipboard %d.",
+                      __FUNCTION__, aWhichClipboard);
+    return sequenceNumberOrError.unwrapErr();
+  }
+
+  nsTArray<nsCString> results;
+  for (const auto& flavor : aFlavorList) {
+    auto resultOrError = HasNativeClipboardDataMatchingFlavors(
+        AutoTArray<nsCString, 1>{flavor}, aWhichClipboard);
+    if (resultOrError.isOk() && resultOrError.unwrap()) {
+      results.AppendElement(flavor);
+    }
+  }
+
+  *_retval =
+      mozilla::MakeAndAddRef<AsyncGetClipboardData>(
+          aWhichClipboard, sequenceNumberOrError.unwrap(), std::move(results),
+          false /* aFromCache */, this, aRequestingWindowContext)
+          .take();
+  return NS_OK;
+}
+
 NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard) {
   MOZ_CLIPBOARD_LOG("%s: clipboard=%d", __FUNCTION__, aWhichClipboard);
 
diff --git a/widget/nsBaseClipboard.h b/widget/nsBaseClipboard.h
index 8f90be725a..ffa68d6240 100644
--- a/widget/nsBaseClipboard.h
+++ b/widget/nsBaseClipboard.h
@@ -55,6 +55,10 @@ class nsBaseClipboard : public nsIClipboard {
       mozilla::dom::WindowContext* aRequestingWindowContext,
       nsIPrincipal* aRequestingPrincipal,
       nsIAsyncClipboardGetCallback* aCallback) override final;
+  NS_IMETHOD GetDataSnapshotSync(
+      const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
+      mozilla::dom::WindowContext* aRequestingWindowContext,
+      nsIAsyncGetClipboardData** _retval) override final;
   NS_IMETHOD EmptyClipboard(int32_t aWhichClipboard) override final;
   NS_IMETHOD HasDataMatchingFlavors(const nsTArray<nsCString>& aFlavorList,
                                     int32_t aWhichClipboard,
@@ -206,6 +210,11 @@ class nsBaseClipboard : public nsIClipboard {
                                nsIPrincipal* aRequestingPrincipal,
                                nsIAsyncClipboardGetCallback* aCallback);
 
+  already_AddRefed<nsIAsyncGetClipboardData>
+  MaybeCreateGetRequestFromClipboardCache(
+      const nsTArray<nsCString>& aFlavorList, int32_t aClipboardType,
+      mozilla::dom::WindowContext* aRequestingWindowContext);
+
   // Track the pending request for each clipboard type separately. And only need
   // to track the latest request for each clipboard type as the prior pending
   // request will be canceled when a new request is made.
diff --git a/widget/nsBaseFilePicker.cpp b/widget/nsBaseFilePicker.cpp
index 53be3d80b7..faa78f06f2 100644
--- a/widget/nsBaseFilePicker.cpp
+++ b/widget/nsBaseFilePicker.cpp
@@ -18,6 +18,7 @@
 #include "mozilla/dom/File.h"
 #include "mozilla/dom/Promise.h"
 #include "mozilla/dom/Element.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
 #include "mozilla/Components.h"
 #include "mozilla/StaticPrefs_widget.h"
 #include "WidgetUtils.h"
@@ -156,17 +157,16 @@ nsBaseFilePicker::nsBaseFilePicker()
 
 nsBaseFilePicker::~nsBaseFilePicker() = default;
 
-NS_IMETHODIMP nsBaseFilePicker::Init(
-    mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-    nsIFilePicker::Mode aMode,
-    mozilla::dom::BrowsingContext* aBrowsingContext) {
-  MOZ_ASSERT(aParent,
-             "Null parent passed to filepicker, no file "
+NS_IMETHODIMP nsBaseFilePicker::Init(BrowsingContext* aBrowsingContext,
+                                     const nsAString& aTitle,
+                                     nsIFilePicker::Mode aMode) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(aBrowsingContext,
+             "Null bc passed to filepicker, no file "
              "picker for you!");
 
-  mParent = nsPIDOMWindowOuter::From(aParent);
-
-  nsCOMPtr<nsIWidget> widget = WidgetUtils::DOMWindowToWidget(mParent);
+  nsCOMPtr<nsIWidget> widget =
+      aBrowsingContext->Canonical()->GetParentProcessWidgetContaining();
   NS_ENSURE_TRUE(widget, NS_ERROR_FAILURE);
 
   mBrowsingContext = aBrowsingContext;
@@ -462,6 +462,8 @@ nsBaseFilePicker::GetOkButtonLabel(nsAString& aLabel) {
 
 NS_IMETHODIMP
 nsBaseFilePicker::GetDomFileOrDirectory(nsISupports** aValue) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  NS_ENSURE_ARG_POINTER(mBrowsingContext);
   nsCOMPtr<nsIFile> localFile;
   nsresult rv = GetFile(getter_AddRefs(localFile));
   NS_ENSURE_SUCCESS(rv, rv);
@@ -471,7 +473,10 @@ nsBaseFilePicker::GetDomFileOrDirectory(nsISupports** aValue) {
     return NS_OK;
   }
 
-  auto* innerParent = mParent ? mParent->GetCurrentInnerWindow() : nullptr;
+  auto* innerParent =
+      mBrowsingContext->GetDOMWindow()
+          ? mBrowsingContext->GetDOMWindow()->GetCurrentInnerWindow()
+          : nullptr;
 
   if (!innerParent) {
     return NS_ERROR_FAILURE;
@@ -485,11 +490,19 @@ NS_IMETHODIMP
 nsBaseFilePicker::GetDomFileOrDirectoryEnumerator(
     nsISimpleEnumerator** aValue) {
   nsCOMPtr<nsISimpleEnumerator> iter;
+  MOZ_ASSERT(XRE_IsParentProcess());
+  NS_ENSURE_ARG_POINTER(mBrowsingContext);
   nsresult rv = GetFiles(getter_AddRefs(iter));
   NS_ENSURE_SUCCESS(rv, rv);
 
+  auto* parent = mBrowsingContext->GetDOMWindow();
+
+  if (!parent) {
+    return NS_ERROR_FAILURE;
+  }
+
   RefPtr<nsBaseFilePickerEnumerator> retIter =
-      new nsBaseFilePickerEnumerator(mParent, iter, mMode);
+      new nsBaseFilePickerEnumerator(parent, iter, mMode);
 
   retIter.forget(aValue);
   return NS_OK;
diff --git a/widget/nsBaseFilePicker.h b/widget/nsBaseFilePicker.h
index 3d26a1822e..52b8bc7798 100644
--- a/widget/nsBaseFilePicker.h
+++ b/widget/nsBaseFilePicker.h
@@ -28,9 +28,8 @@ class nsBaseFilePicker : public nsIFilePicker {
   nsBaseFilePicker();
   virtual ~nsBaseFilePicker();
 
-  NS_IMETHOD Init(mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-                  nsIFilePicker::Mode aMode,
-                  mozilla::dom::BrowsingContext* aBrowsingContext) override;
+  NS_IMETHOD Init(mozilla::dom::BrowsingContext* aBrowsingContext,
+                  const nsAString& aTitle, nsIFilePicker::Mode aMode) override;
   NS_IMETHOD IsModeSupported(nsIFilePicker::Mode aMode, JSContext* aCx,
                              mozilla::dom::Promise** aPromise) override;
 #ifndef XP_WIN
@@ -70,9 +69,6 @@ class nsBaseFilePicker : public nsIFilePicker {
   nsCOMPtr<nsIFile> mDisplayDirectory;
   nsString mDisplaySpecialDirectory;
 
-  nsCOMPtr<nsPIDOMWindowOuter> mParent;
-  // The BrowsingContext from which the file picker is being opened.
-  // Used for content analysis.
   RefPtr<mozilla::dom::BrowsingContext> mBrowsingContext;
   nsIFilePicker::Mode mMode;
   nsString mOkButtonLabel;
diff --git a/widget/nsBaseWidget.cpp b/widget/nsBaseWidget.cpp
index 35c580c106..d35afb470a 100644
--- a/widget/nsBaseWidget.cpp
+++ b/widget/nsBaseWidget.cpp
@@ -547,6 +547,12 @@ nsIWidget* nsBaseWidget::GetSheetWindowParent(void) { return nullptr; }
 
 float nsBaseWidget::GetDPI() { return 96.0f; }
 
+void nsBaseWidget::NotifyAPZOfDPIChange() {
+  if (mAPZC) {
+    mAPZC->SetDPI(GetDPI());
+  }
+}
+
 CSSToLayoutDeviceScale nsIWidget::GetDefaultScale() {
   double devPixelsPerCSSPixel = StaticPrefs::layout_css_devPixelsPerPx();
 
diff --git a/widget/nsBaseWidget.h b/widget/nsBaseWidget.h
index 8b6e8ad0eb..756f2ab7eb 100644
--- a/widget/nsBaseWidget.h
+++ b/widget/nsBaseWidget.h
@@ -354,6 +354,8 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
   // theme changes.
   void NotifyThemeChanged(mozilla::widget::ThemeChangeKind);
 
+  void NotifyAPZOfDPIChange();
+
 #ifdef ACCESSIBILITY
   // Get the accessible for the window.
   mozilla::a11y::LocalAccessible* GetRootAccessible();
@@ -365,13 +367,6 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
 
   PopupLevel GetPopupLevel() { return mPopupLevel; }
 
-  // return true if this is a popup widget with a native titlebar
-  bool IsPopupWithTitleBar() const {
-    return (mWindowType == WindowType::Popup &&
-            mBorderStyle != BorderStyle::Default &&
-            mBorderStyle & BorderStyle::Title);
-  }
-
   void ReparentNativeWidget(nsIWidget* aNewParent) override {}
 
   const SizeConstraints GetSizeConstraints() override;
diff --git a/widget/nsClipboardProxy.cpp b/widget/nsClipboardProxy.cpp
index 41f285461b..3b27d5954d 100644
--- a/widget/nsClipboardProxy.cpp
+++ b/widget/nsClipboardProxy.cpp
@@ -174,6 +174,28 @@ NS_IMETHODIMP AsyncGetClipboardDataProxy::GetData(
   return NS_OK;
 }
 
+static Result<RefPtr<AsyncGetClipboardDataProxy>, nsresult>
+CreateAsyncGetClipboardDataProxy(
+    ClipboardReadRequestOrError&& aClipboardReadRequestOrError) {
+  if (aClipboardReadRequestOrError.type() ==
+      ClipboardReadRequestOrError::Tnsresult) {
+    MOZ_ASSERT(NS_FAILED(aClipboardReadRequestOrError.get_nsresult()));
+    return Err(aClipboardReadRequestOrError.get_nsresult());
+  }
+
+  ClipboardReadRequest& request =
+      aClipboardReadRequestOrError.get_ClipboardReadRequest();
+  auto requestChild = MakeRefPtr<ClipboardReadRequestChild>(
+      std::move(request.availableTypes()));
+  if (NS_WARN_IF(
+          !ContentChild::GetSingleton()->BindPClipboardReadRequestEndpoint(
+              std::move(request.childEndpoint()), requestChild))) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  return MakeRefPtr<AsyncGetClipboardDataProxy>(requestChild);
+}
+
 }  // namespace
 
 NS_IMETHODIMP nsClipboardProxy::AsyncGetData(
@@ -198,23 +220,16 @@ NS_IMETHODIMP nsClipboardProxy::AsyncGetData(
       ->Then(
           GetMainThreadSerialEventTarget(), __func__,
           /* resolve */
-          [callback = nsCOMPtr{aCallback}](const PClipboardReadRequestOrError&
-                                               aClipboardReadRequestOrError) {
-            if (aClipboardReadRequestOrError.type() ==
-                PClipboardReadRequestOrError::Tnsresult) {
-              MOZ_ASSERT(
-                  NS_FAILED(aClipboardReadRequestOrError.get_nsresult()));
-              callback->OnError(aClipboardReadRequestOrError.get_nsresult());
+          [callback = nsCOMPtr{aCallback}](
+              ClipboardReadRequestOrError&& aClipboardReadRequestOrError) {
+            auto result = CreateAsyncGetClipboardDataProxy(
+                std::move(aClipboardReadRequestOrError));
+            if (result.isErr()) {
+              callback->OnError(result.unwrapErr());
               return;
             }
 
-            auto asyncGetClipboardData = MakeRefPtr<AsyncGetClipboardDataProxy>(
-                static_cast<ClipboardReadRequestChild*>(
-                    aClipboardReadRequestOrError.get_PClipboardReadRequest()
-                        .AsChild()
-                        .get()));
-
-            callback->OnSuccess(asyncGetClipboardData);
+            callback->OnSuccess(result.inspect());
           },
           /* reject */
           [callback = nsCOMPtr{aCallback}](
@@ -224,6 +239,35 @@ NS_IMETHODIMP nsClipboardProxy::AsyncGetData(
   return NS_OK;
 }
 
+NS_IMETHODIMP nsClipboardProxy::GetDataSnapshotSync(
+    const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
+    mozilla::dom::WindowContext* aRequestingWindowContext,
+    nsIAsyncGetClipboardData** _retval) {
+  *_retval = nullptr;
+
+  if (aFlavorList.IsEmpty()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (!nsIClipboard::IsClipboardTypeSupported(aWhichClipboard)) {
+    MOZ_CLIPBOARD_LOG("%s: clipboard %d is not supported.", __FUNCTION__,
+                      aWhichClipboard);
+    return NS_ERROR_FAILURE;
+  }
+
+  ContentChild* contentChild = ContentChild::GetSingleton();
+  ClipboardReadRequestOrError requestOrError;
+  contentChild->SendGetClipboardDataSnapshotSync(
+      aFlavorList, aWhichClipboard, aRequestingWindowContext, &requestOrError);
+  auto result = CreateAsyncGetClipboardDataProxy(std::move(requestOrError));
+  if (result.isErr()) {
+    return result.unwrapErr();
+  }
+
+  result.unwrap().forget(_retval);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsClipboardProxy::EmptyClipboard(int32_t aWhichClipboard) {
   ContentChild::GetSingleton()->SendEmptyClipboard(aWhichClipboard);
diff --git a/widget/nsFilePickerProxy.cpp b/widget/nsFilePickerProxy.cpp
index 8777f338cb..b71ad0920e 100644
--- a/widget/nsFilePickerProxy.cpp
+++ b/widget/nsFilePickerProxy.cpp
@@ -25,19 +25,19 @@ nsFilePickerProxy::nsFilePickerProxy()
 nsFilePickerProxy::~nsFilePickerProxy() = default;
 
 NS_IMETHODIMP
-nsFilePickerProxy::Init(mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-                        nsIFilePicker::Mode aMode,
-                        BrowsingContext* aBrowsingContext) {
-  BrowserChild* browserChild = BrowserChild::GetFrom(aParent);
+nsFilePickerProxy::Init(BrowsingContext* aBrowsingContext,
+                        const nsAString& aTitle, nsIFilePicker::Mode aMode) {
+  BrowserChild* browserChild =
+      BrowserChild::GetFrom(aBrowsingContext->GetDocShell());
   if (!browserChild) {
     return NS_ERROR_FAILURE;
   }
 
-  mParent = nsPIDOMWindowOuter::From(aParent);
-
+  mBrowsingContext = aBrowsingContext;
   mMode = aMode;
 
-  browserChild->SendPFilePickerConstructor(this, aTitle, aMode);
+  browserChild->SendPFilePickerConstructor(this, aTitle, aMode,
+                                           aBrowsingContext);
 
   mIPCActive = true;
   return NS_OK;
@@ -155,8 +155,9 @@ nsFilePickerProxy::Close() {
 
 mozilla::ipc::IPCResult nsFilePickerProxy::Recv__delete__(
     const MaybeInputData& aData, const nsIFilePicker::ResultCode& aResult) {
-  nsPIDOMWindowInner* inner =
-      mParent ? mParent->GetCurrentInnerWindow() : nullptr;
+  auto* inner = mBrowsingContext->GetDOMWindow()
+                    ? mBrowsingContext->GetDOMWindow()->GetCurrentInnerWindow()
+                    : nullptr;
 
   if (NS_WARN_IF(!inner)) {
     return IPC_OK();
diff --git a/widget/nsFilePickerProxy.h b/widget/nsFilePickerProxy.h
index 1b6aef13ed..9f12ded3ab 100644
--- a/widget/nsFilePickerProxy.h
+++ b/widget/nsFilePickerProxy.h
@@ -34,9 +34,8 @@ class nsFilePickerProxy : public nsBaseFilePicker,
   NS_DECL_ISUPPORTS
 
   // nsIFilePicker (less what's in nsBaseFilePicker)
-  NS_IMETHOD Init(mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-                  nsIFilePicker::Mode aMode,
-                  mozilla::dom::BrowsingContext* aBrowsingContext) override;
+  NS_IMETHOD Init(mozilla::dom::BrowsingContext* aBrowsingContext,
+                  const nsAString& aTitle, nsIFilePicker::Mode aMode) override;
   NS_IMETHOD AppendFilter(const nsAString& aTitle,
                           const nsAString& aFilter) override;
   NS_IMETHOD GetCapture(nsIFilePicker::CaptureTarget* aCapture) override;
diff --git a/widget/nsIClipboard.idl b/widget/nsIClipboard.idl
index 5ed2d22600..a34f0f9298 100644
--- a/widget/nsIClipboard.idl
+++ b/widget/nsIClipboard.idl
@@ -178,6 +178,31 @@ interface nsIClipboard : nsISupports
                       in nsIPrincipal aRequestingPrincipal,
                       in nsIAsyncClipboardGetCallback aCallback);
 
+    /**
+     * Requests getting data from the native clipboard. This does not actually
+     * retreive the data, but returns a nsIAsyncGetClipboardData contains
+     * current avaiable data formats. If the native clipboard is updated, either
+     * by us or other application, the existing nsIAsyncGetClipboardData becomes
+     * invalid.
+     *
+     * @param  aFlavorList
+     *         Specific data formats ('flavors') that can be retrieved from the
+     *         clipboard.
+     * @param  aWhichClipboard
+     *         Specifies the clipboard to which this operation applies.
+     * @param  aRequestingWindowContext [optional]
+     *         The window context window that is requesting the clipboard, which is
+     *         used for content analysis. Passing null means that the content is
+     *         exempt from content analysis. (for example, scripted clipboard read by
+     *         system code) This parameter should not be null when calling this from a
+     *         content process.
+     * @return nsIAsyncSetClipboardData if successful.
+     * @throws if the request can not be made.
+     */
+    nsIAsyncGetClipboardData getDataSnapshotSync(in Array<ACString> aFlavorList,
+                                                 in long aWhichClipboard,
+                                                 [optional] in WindowContext aRequestingWindowContext);
+
    /**
     * This empties the clipboard and notifies the clipboard owner.
     * This empties the "logical" clipboard. It does not clear the native clipboard.
diff --git a/widget/nsIFilePicker.idl b/widget/nsIFilePicker.idl
index e9bdedfd42..db5ac9f7bd 100644
--- a/widget/nsIFilePicker.idl
+++ b/widget/nsIFilePicker.idl
@@ -66,19 +66,13 @@ interface nsIFilePicker : nsISupports
   * Initialize the file picker widget.  The file picker is not valid until this
   * method is called.
   *
-  * @param      parent   mozIDOMWindow parent.  This dialog will be dependent
-  *                      on this parent. parent must be non-null.
-  * @param      title    The title for the file widget
-  * @param      mode     load, save, or get folder
-  * @param      browsingContext [optional]
-  *             The context in which the file picker is being shown. This is
-  *             used for content analysis and can be omitted if chrome is
-  *             showing the file picker.
-  */
-  void init(in mozIDOMWindowProxy parent,
-            in AString title,
-            in nsIFilePicker_Mode mode,
-            [optional] in BrowsingContext browsingContext);
+  * @param      browsingContext   The context in which the file picker is being
+  *                               shown, must be non-null.
+  * @param      title             The title for the file widget
+  * @param      mode              load, save, or get folder
+  *
+  */
+  void init(in BrowsingContext browsingContext, in AString title, in nsIFilePicker_Mode mode);
 
   /**
    * Returns a Promise that resolves to true if the passed nsIFilePicker mode
diff --git a/widget/nsIGfxInfo.idl b/widget/nsIGfxInfo.idl
index 4f4f0b7e1e..0df8696da7 100644
--- a/widget/nsIGfxInfo.idl
+++ b/widget/nsIGfxInfo.idl
@@ -19,6 +19,8 @@ interface nsIGfxInfo : nsISupports
   readonly attribute AString AzureCanvasBackend;
   readonly attribute AString AzureContentBackend;
   readonly attribute boolean usingGPUProcess;
+  readonly attribute boolean usingRemoteCanvas;
+  readonly attribute boolean usingAcceleratedCanvas;
   readonly attribute boolean hasBattery;
   readonly attribute AString DWriteVersion;
   readonly attribute AString cleartypeParameters;
@@ -215,8 +217,12 @@ interface nsIGfxInfo : nsISupports
   const long FEATURE_VIDEO_SOFTWARE_OVERLAY = 46;
   /* Whether WebGL is allowed to use hardware rendering, otherwise software fallbacks. */
   const long FEATURE_WEBGL_USE_HARDWARE = 47;
+  /* Whether overlay is allowed to VideoProcessor-HDR on SDR content */
+  const long FEATURE_OVERLAY_VP_AUTO_HDR = 48;
+  /* Whether overlay is allowed to VideoProcessor Super Resolution */
+  const long FEATURE_OVERLAY_VP_SUPER_RESOLUTION = 49;
   /* the maximum feature value. */
-  const long FEATURE_MAX_VALUE = FEATURE_WEBGL_USE_HARDWARE;
+  const long FEATURE_MAX_VALUE = FEATURE_OVERLAY_VP_SUPER_RESOLUTION;
 
   /*
    * A set of return values from GetFeatureStatus
diff --git a/widget/nsIPrintDialogService.idl b/widget/nsIPrintDialogService.idl
index 1c79ddd76b..b1e318b948 100644
--- a/widget/nsIPrintDialogService.idl
+++ b/widget/nsIPrintDialogService.idl
@@ -56,11 +56,3 @@ interface nsIPrintDialogService : nsISupports
                            in nsIPrintSettings aPrintSettings);
 
 };
-
-%{C++
-#define NS_PRINTDIALOGSERVICE_IID \
- {0x88af6712, 0xa9fd, 0x4393, { 0x9a, 0xf3, 0x3f, 0xfb, 0xb1, 0xf2, 0xca, 0xaf}}
-
-#define NS_PRINTDIALOGSERVICE_CONTRACTID \
-  ("@mozilla.org/widget/printdialog-service;1")
-%}
diff --git a/widget/nsIPrintSettingsService.idl b/widget/nsIPrintSettingsService.idl
index 3b33724c34..7e57c6766e 100644
--- a/widget/nsIPrintSettingsService.idl
+++ b/widget/nsIPrintSettingsService.idl
@@ -143,9 +143,3 @@ interface nsIPrintSettingsService : nsISupports
                                   in nsIPrintSettings aPrintSettings);
 
 };
-
-%{C++
-// {841387C8-72E6-484b-9296-BF6EEA80D58A}
-#define NS_PRINTSETTINGSSERVICE_IID \
- {0x841387c8, 0x72e6, 0x484b, { 0x92, 0x96, 0xbf, 0x6e, 0xea, 0x80, 0xd5, 0x8a}}
-%}
diff --git a/widget/nsISound.idl b/widget/nsISound.idl
index 8b4a2f29c0..c3aca6674d 100644
--- a/widget/nsISound.idl
+++ b/widget/nsISound.idl
@@ -23,10 +23,6 @@ interface nsISound : nsISupports
   /**
    * In some situations, playEventSound will be called.  Then, each
    * implementations will play a system sound for the event if it's necessary.
-   *
-   * NOTE: Don't change these values because they are used in
-   * nsPIPromptService.idl. So, if they are changed, that makes big impact for
-   * the embedders.
    */
   const unsigned long EVENT_NEW_MAIL_RECEIVED           = 0;
   const unsigned long EVENT_ALERT_DIALOG_OPEN           = 1;
diff --git a/widget/nsNativeTheme.cpp b/widget/nsNativeTheme.cpp
index 2484f802cd..6900414ff3 100644
--- a/widget/nsNativeTheme.cpp
+++ b/widget/nsNativeTheme.cpp
@@ -57,6 +57,12 @@ NS_IMPL_ISUPPORTS(nsNativeTheme, nsITimerCallback, nsINamed)
         aAppearance == StyleAppearance::ButtonArrowPrevious ||
         aAppearance == StyleAppearance::ButtonArrowNext ||
         aAppearance == StyleAppearance::ButtonArrowUp ||
+#ifdef MOZ_WIDGET_GTK
+        aAppearance == StyleAppearance::MozWindowButtonClose ||
+        aAppearance == StyleAppearance::MozWindowButtonMinimize ||
+        aAppearance == StyleAppearance::MozWindowButtonRestore ||
+        aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+#endif
         aAppearance == StyleAppearance::ButtonArrowDown) {
       aFrame = aFrame->GetParent();
       frameContent = aFrame->GetContent();
diff --git a/widget/nsPrinterBase.cpp b/widget/nsPrinterBase.cpp
index 7e01b9e12f..0c8f71d574 100644
--- a/widget/nsPrinterBase.cpp
+++ b/widget/nsPrinterBase.cpp
@@ -10,6 +10,7 @@
 #include "nsIPrintSettings.h"
 #include "nsPrintSettingsService.h"
 #include "PrintBackgroundTask.h"
+#include "mozilla/EnumeratedArrayCycleCollection.h"
 #include "mozilla/dom/Promise.h"
 
 using namespace mozilla;
@@ -83,25 +84,6 @@ NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPrinterInfo)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPrinterInfo)
 
-template <typename Index, Index Size, typename Value>
-inline void ImplCycleCollectionTraverse(
-    nsCycleCollectionTraversalCallback& aCallback,
-    EnumeratedArray<Index, Size, Value>& aArray, const char* aName,
-    uint32_t aFlags = 0) {
-  aFlags |= CycleCollectionEdgeNameArrayFlag;
-  for (Value& element : aArray) {
-    ImplCycleCollectionTraverse(aCallback, element, aName, aFlags);
-  }
-}
-
-template <typename Index, Index Size, typename Value>
-inline void ImplCycleCollectionUnlink(
-    EnumeratedArray<Index, Size, Value>& aArray) {
-  for (Value& element : aArray) {
-    ImplCycleCollectionUnlink(element);
-  }
-}
-
 namespace mozilla {
 
 template <>
@@ -143,8 +125,8 @@ nsresult nsPrinterBase::AsyncPromiseAttributeGetter(
     BackgroundTask<T, Args...> aBackgroundTask, Args... aArgs) {
   MOZ_ASSERT(NS_IsMainThread());
 
-  static constexpr EnumeratedArray<AsyncAttribute, AsyncAttribute::Last,
-                                   nsLiteralCString>
+  static constexpr EnumeratedArray<AsyncAttribute, nsLiteralCString,
+                                   size_t(AsyncAttribute::Last)>
       attributeKeys{"SupportsDuplex"_ns, "SupportsColor"_ns,
                     "SupportsMonochrome"_ns, "SupportsCollation"_ns,
                     "PrinterInfo"_ns};
diff --git a/widget/nsPrinterBase.h b/widget/nsPrinterBase.h
index abd4f82705..8ce1f8a90d 100644
--- a/widget/nsPrinterBase.h
+++ b/widget/nsPrinterBase.h
@@ -104,8 +104,8 @@ class nsPrinterBase : public nsIPrinter {
       const mozilla::gfx::SizeDouble& aSize) const;
 
  private:
-  mozilla::EnumeratedArray<AsyncAttribute, AsyncAttribute::Last,
-                           RefPtr<Promise>>
+  mozilla::EnumeratedArray<AsyncAttribute, RefPtr<Promise>,
+                           size_t(AsyncAttribute::Last)>
       mAsyncAttributePromises;
   // List of built-in, commonly used paper sizes.
   const RefPtr<const mozilla::CommonPaperInfoArray> mCommonPaperInfo;
diff --git a/widget/nsXPLookAndFeel.cpp b/widget/nsXPLookAndFeel.cpp
index 05b8952b04..9eabbd84b6 100644
--- a/widget/nsXPLookAndFeel.cpp
+++ b/widget/nsXPLookAndFeel.cpp
@@ -57,7 +57,7 @@ using FontID = mozilla::LookAndFeel::FontID;
 
 template <typename Index, typename Value, Index kEnd>
 class EnumeratedCache {
-  mozilla::EnumeratedArray<Index, kEnd, Value> mEntries;
+  mozilla::EnumeratedArray<Index, Value, size_t(kEnd)> mEntries;
   std::bitset<size_t(kEnd)> mValidity;
 
  public:
@@ -161,7 +161,6 @@ static const char sIntPrefs[][45] = {
     "ui.SpellCheckerUnderlineStyle",
     "ui.menuBarDrag",
     "ui.scrollbarButtonAutoRepeatBehavior",
-    "ui.tooltipDelay",
     "ui.swipeAnimationEnabled",
     "ui.scrollbarDisplayOnMouseMove",
     "ui.scrollbarFadeBeginDelay",
@@ -185,6 +184,7 @@ static const char sIntPrefs[][45] = {
     "ui.systemScrollbarSize",
     "ui.touchDeviceSupportPresent",
     "ui.titlebarRadius",
+    "ui.titlebarButtonSpacing",
     "ui.dynamicRange",
     "ui.videoDynamicRange",
     "ui.panelAnimations",
diff --git a/widget/tests/browser/browser_test_clipboard_contextmenu.js b/widget/tests/browser/browser_test_clipboard_contextmenu.js
index 4d268d5be4..80e8c33282 100644
--- a/widget/tests/browser/browser_test_clipboard_contextmenu.js
+++ b/widget/tests/browser/browser_test_clipboard_contextmenu.js
@@ -63,7 +63,7 @@ async function clipboardAsyncGetData(aBrowser, aClipboardType) {
             "nsIAsyncClipboardGetCallback",
           ]),
           // nsIAsyncClipboardGetCallback
-          onSuccess: aAsyncGetClipboardData => {
+          onSuccess: () => {
             resolve();
           },
           onError: aResult => {
diff --git a/widget/tests/browser/browser_test_clipboardcache.js b/widget/tests/browser/browser_test_clipboardcache.js
index 8cb6adb8b5..64deb99608 100644
--- a/widget/tests/browser/browser_test_clipboardcache.js
+++ b/widget/tests/browser/browser_test_clipboardcache.js
@@ -103,6 +103,10 @@ async function testCopyPaste(isPrivate) {
     document.execCommand("paste");
     return pastePromise;
   });
+
+  // Don't use Assert.strictEqual here because the test starts timing out,
+  // because the logging creates lots of copies of this very huge string.
+  // eslint-disable-next-line mozilla/no-comparison-or-assignment-inside-ok
   ok(readStr === Ipsum, "Read what we pasted");
 
   if (isPrivate) {
diff --git a/widget/tests/browser/browser_test_swipe_gesture.js b/widget/tests/browser/browser_test_swipe_gesture.js
index 0ac85d80c8..0f45672206 100644
--- a/widget/tests/browser/browser_test_swipe_gesture.js
+++ b/widget/tests/browser/browser_test_swipe_gesture.js
@@ -123,9 +123,9 @@ add_task(async () => {
   computedOpacity = window
     .getComputedStyle(gHistorySwipeAnimation._prevBox)
     .getPropertyValue("opacity");
-  ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+  Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
   opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-  ok(opacity == 0, "element.style opacity of prevbox 0");
+  Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
   if (isTranslatingIcon) {
     // We don't have a transition for translate property so that we still have
@@ -232,9 +232,9 @@ add_task(async () => {
   computedOpacity = window
     .getComputedStyle(gHistorySwipeAnimation._prevBox)
     .getPropertyValue("opacity");
-  ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+  Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
   opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-  ok(opacity == 0, "element.style opacity of prevbox 0");
+  Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
   // Make sure the gesture triggered going back to the previous page.
   await Promise.all([startLoadingPromise, stoppedLoadingPromise]);
@@ -317,9 +317,9 @@ add_task(async () => {
     let computedOpacity = window
       .getComputedStyle(gHistorySwipeAnimation._prevBox)
       .getPropertyValue("opacity");
-    ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+    Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
     let opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-    ok(opacity == 0, "element.style opacity of prevbox 0");
+    Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
     // Make sure the gesture triggered going back to the previous page.
     await Promise.all([startLoadingPromise, stoppedLoadingPromise]);
@@ -343,7 +343,7 @@ add_task(async () => {
     }
     numTries--;
   }
-  ok(numTries > 0, "never ran the test");
+  Assert.greater(numTries, 0, "never ran the test");
   await SpecialPowers.popPrefEnv();
 });
 
@@ -576,7 +576,7 @@ add_task(async () => {
 
   await panLeftToRightBegin(tab.linkedBrowser, 100, 100, 100);
 
-  ok(gHistorySwipeAnimation._prevBox != null, "should have prevbox");
+  Assert.notEqual(gHistorySwipeAnimation._prevBox, null, "should have prevbox");
   let transitionCancelPromise = new Promise(resolve => {
     gHistorySwipeAnimation._prevBox.addEventListener(
       "transitioncancel",
@@ -635,7 +635,7 @@ add_task(async () => {
 
   await panRightToLeftBegin(tab.linkedBrowser, 100, 100, 100);
 
-  ok(gHistorySwipeAnimation._nextBox != null, "should have nextbox");
+  Assert.notEqual(gHistorySwipeAnimation._nextBox, null, "should have nextbox");
   transitionCancelPromise = new Promise(resolve => {
     gHistorySwipeAnimation._nextBox.addEventListener(
       "transitioncancel",
@@ -1131,7 +1131,7 @@ add_task(async () => {
 
   // Set up an APZ aware event listener and...
   await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
-    content.document.documentElement.addEventListener("wheel", e => {}, {
+    content.document.documentElement.addEventListener("wheel", () => {}, {
       passive: false,
     });
     await content.wrappedJSObject.promiseApzFlushedRepaints();
diff --git a/widget/tests/chrome.toml b/widget/tests/chrome.toml
index 08d02d3c36..8706a67185 100644
--- a/widget/tests/chrome.toml
+++ b/widget/tests/chrome.toml
@@ -9,9 +9,6 @@ support-files = [
 
 # Privacy relevant
 
-["test_bug1123480.xhtml"]
-skip-if = ["win11_2009 && bits == 32"]
-
 ["test_bug343416.xhtml"]
 skip-if = ["debug"]
 
@@ -66,8 +63,8 @@ run-if = ["os == 'mac'"] # Cocoa widget test
 
 ["test_bug760802.xhtml"]
 
-["test_clipboard_chrome.html"]
-support-files = "file_test_clipboard.js"
+["test_bug1123480.xhtml"]
+skip-if = ["win11_2009 && bits == 32"]
 
 ["test_clipboard_asyncGetData_chrome.html"]
 support-files = "file_test_clipboard_asyncGetData.js"
@@ -77,11 +74,20 @@ support-files = "file_test_clipboard_asyncSetData.js"
 
 ["test_clipboard_cache_chrome.html"]
 
+["test_clipboard_chrome.html"]
+support-files = "file_test_clipboard.js"
+
+["test_clipboard_getDataSnapshotSync_chrome.html"]
+support-files = "file_test_clipboard_getDataSnapshotSync.js"
+
 ["test_clipboard_owner_chrome.html"]
 
 ["test_composition_text_querycontent.xhtml"]
 support-files = ["window_composition_text_querycontent.xhtml"]
 
+["test_ime_focus_with_multiple_contenteditable.html"]
+support-files = ["file_ime_state_test_helper.js"]
+
 ["test_ime_state_in_contenteditable_on_readonly_change_in_parent.html"]
 support-files = [
   "file_ime_state_test_helper.js",
diff --git a/widget/tests/clipboard_helper.js b/widget/tests/clipboard_helper.js
index 96787468fb..76ed2aeb37 100644
--- a/widget/tests/clipboard_helper.js
+++ b/widget/tests/clipboard_helper.js
@@ -157,11 +157,21 @@ function getClipboardData(aFlavor, aClipboardType) {
   }
 }
 
-function asyncGetClipboardData(aClipboardType) {
+function getClipboardDataSnapshotSync(aClipboardType) {
+  return clipboard.getDataSnapshotSync(
+    ["text/plain", "text/html", "image/png"],
+    aClipboardType
+  );
+}
+
+function asyncGetClipboardData(
+  aClipboardType,
+  aFormats = ["text/plain", "text/html", "image/png"]
+) {
   return new Promise((resolve, reject) => {
     try {
       clipboard.asyncGetData(
-        ["text/plain", "text/html", "image/png"],
+        aFormats,
         aClipboardType,
         null,
         SpecialPowers.Services.scriptSecurityManager.getSystemPrincipal(),
diff --git a/widget/tests/file_test_clipboard_asyncGetData.js b/widget/tests/file_test_clipboard_asyncGetData.js
index e7f2e5f0f1..3ff5700e1a 100644
--- a/widget/tests/file_test_clipboard_asyncGetData.js
+++ b/widget/tests/file_test_clipboard_asyncGetData.js
@@ -94,7 +94,7 @@ clipboardTypes.forEach(function (type) {
       () => {
         ok(false, "asyncClipboardRequestGetData should not success");
       },
-      e => {
+      () => {
         ok(true, "asyncClipboardRequestGetData should reject");
       }
     );
@@ -133,7 +133,7 @@ clipboardTypes.forEach(function (type) {
       () => {
         ok(false, "asyncClipboardRequestGetData should not success");
       },
-      e => {
+      () => {
         ok(true, "asyncClipboardRequestGetData should reject");
       }
     );
diff --git a/widget/tests/file_test_clipboard_getDataSnapshotSync.js b/widget/tests/file_test_clipboard_getDataSnapshotSync.js
new file mode 100644
index 0000000000..92d7475e9c
--- /dev/null
+++ b/widget/tests/file_test_clipboard_getDataSnapshotSync.js
@@ -0,0 +1,153 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* import-globals-from clipboard_helper.js */
+
+"use strict";
+
+clipboardTypes.forEach(function (type) {
+  if (!clipboard.isClipboardTypeSupported(type)) {
+    add_task(async function test_clipboard_requestGetData_not_support() {
+      info(`Test getDataSnapshotSync request throwing on ${type}`);
+      SimpleTest.doesThrow(
+        () => clipboard.getDataSnapshotSync(["text/plain"], type),
+        "Passing unsupported clipboard type should throw"
+      );
+    });
+    return;
+  }
+
+  add_task(async function test_clipboard_getDataSnapshotSync_throw() {
+    info(`Test getDataSnapshotSync request throwing on ${type}`);
+    SimpleTest.doesThrow(
+      () => clipboard.getDataSnapshotSync([], type),
+      "Passing empty flavor list should throw"
+    );
+  });
+
+  add_task(
+    async function test_clipboard_getDataSnapshotSync_no_matched_flavor() {
+      info(`Test getDataSnapshotSync have no matched flavor on ${type}`);
+      cleanupAllClipboard();
+      is(
+        getClipboardData("text/plain", type),
+        null,
+        "ensure clipboard is empty"
+      );
+
+      writeRandomStringToClipboard("text/plain", type);
+      let request = clipboard.getDataSnapshotSync(["text/html"], type);
+      isDeeply(request.flavorList, [], "Check flavorList");
+    }
+  );
+
+  add_task(async function test_empty_data() {
+    info(`Test getDataSnapshotSync request with empty data on ${type}`);
+    cleanupAllClipboard();
+    is(getClipboardData("text/plain", type), null, "ensure clipboard is empty");
+
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, [], "Check flavorList");
+    await asyncClipboardRequestGetData(request, "text/plain", true).catch(
+      () => {}
+    );
+  });
+
+  add_task(async function test_clipboard_getDataSnapshotSync_after_write() {
+    info(`Test getDataSnapshotSync request after write on ${type}`);
+
+    let str = writeRandomStringToClipboard("text/plain", type);
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+    ok(request.valid, "request should still be valid");
+    // Requesting a flavor that is not in the list should throw error.
+    await asyncClipboardRequestGetData(request, "text/html", true).catch(
+      () => {}
+    );
+    ok(request.valid, "request should still be valid");
+
+    // Writing a new data should invalid existing get request.
+    str = writeRandomStringToClipboard("text/plain", type);
+    await asyncClipboardRequestGetData(request, "text/plain").then(
+      () => {
+        ok(false, "asyncClipboardRequestGetData should not success");
+      },
+      () => {
+        ok(true, "asyncClipboardRequestGetData should reject");
+      }
+    );
+    ok(!request.valid, "request should no longer be valid");
+
+    info(`check clipboard data again`);
+    request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+
+    cleanupAllClipboard();
+  });
+
+  add_task(async function test_clipboard_getDataSnapshotSync_after_empty() {
+    info(`Test getDataSnapshotSync request after empty on ${type}`);
+
+    let str = writeRandomStringToClipboard("text/plain", type);
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+    ok(request.valid, "request should still be valid");
+
+    // Empty clipboard data
+    emptyClipboardData(type);
+    is(getClipboardData("text/plain", type), null, "ensure clipboard is empty");
+
+    await asyncClipboardRequestGetData(request, "text/plain").then(
+      () => {
+        ok(false, "asyncClipboardRequestGetData should not success");
+      },
+      () => {
+        ok(true, "asyncClipboardRequestGetData should reject");
+      }
+    );
+    ok(!request.valid, "request should no longer be valid");
+
+    info(`check clipboard data again`);
+    request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, [], "Check flavorList");
+
+    cleanupAllClipboard();
+  });
+});
+
+add_task(async function test_clipboard_getDataSnapshotSync_html_data() {
+  info(`Test getDataSnapshotSync request with html data`);
+
+  const html_str = `<img src="https://example.com/oops">`;
+  writeStringToClipboard(html_str, "text/html", clipboard.kGlobalClipboard);
+
+  let request = getClipboardDataSnapshotSync(clipboard.kGlobalClipboard);
+  isDeeply(request.flavorList, ["text/html"], "Check flavorList");
+  is(
+    await asyncClipboardRequestGetData(request, "text/html"),
+    // On Windows, widget adds extra data into HTML clipboard.
+    navigator.platform.includes("Win")
+      ? `<html><body>\n<!--StartFragment-->${html_str}<!--EndFragment-->\n</body>\n</html>`
+      : html_str,
+    "Check data"
+  );
+  // Requesting a flavor that is not in the list should throw error.
+  await asyncClipboardRequestGetData(request, "text/plain", true).catch(
+    () => {}
+  );
+});
diff --git a/widget/tests/mochitest.toml b/widget/tests/mochitest.toml
index 32dcf5c795..4a4a9d2729 100644
--- a/widget/tests/mochitest.toml
+++ b/widget/tests/mochitest.toml
@@ -25,12 +25,16 @@ skip-if = [
 support-files = ["file_test_clipboard.js"]
 
 ["test_clipboard_asyncGetData.html"]
-skip-if = ["display == 'wayland'"] # Bug 1864211
+skip-if = ["display == 'wayland'"] # Bug 1879835
 support-files = ["file_test_clipboard_asyncGetData.js"]
 
 ["test_clipboard_asyncSetData.html"]
 support-files = ["file_test_clipboard_asyncSetData.js"]
 
+["test_clipboard_getDataSnapshotSync.html"]
+skip-if = ["display == 'wayland'"] # Bug 1879835
+support-files = "file_test_clipboard_getDataSnapshotSync.js"
+
 ["test_contextmenu_by_mouse_on_unix.html"]
 run-if = ["os == 'linux'"]
 skip-if = ["headless"] # headless widget doesn't dispatch contextmenu event by mouse event.
diff --git a/widget/tests/standalone_native_menu_window.xhtml b/widget/tests/standalone_native_menu_window.xhtml
index 4155126ad5..36c65b0e2c 100644
--- a/widget/tests/standalone_native_menu_window.xhtml
+++ b/widget/tests/standalone_native_menu_window.xhtml
@@ -141,13 +141,13 @@
       let popupShowingFired = false;
       let itemActivated = false;
 
-      menupopup.addEventListener("popupshowing", function (e) {
+      menupopup.addEventListener("popupshowing", function () {
         popupShowingFired = true;
 
         let menuitem = document.createElementNS(XUL_NS, "menuitem");
         menuitem.setAttribute("label", "detached menu item");
         /* eslint-disable-next-line no-shadow */
-        menuitem.addEventListener("command", function (e) {
+        menuitem.addEventListener("command", function () {
           itemActivated = true;
         })
         menupopup.appendChild(menuitem);
diff --git a/widget/tests/test_bug343416.xhtml b/widget/tests/test_bug343416.xhtml
index bf4dbbb9b4..32e717d6e5 100644
--- a/widget/tests/test_bug343416.xhtml
+++ b/widget/tests/test_bug343416.xhtml
@@ -30,7 +30,7 @@ SimpleTest.waitForExplicitFinish();
 var idleObserver =
 {
     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
-    observe: function _observe(subject, topic, data)
+    observe: function _observe(subject, topic)
     {
         if (topic != "idle")
             return;
diff --git a/widget/tests/test_clipboard_cache_chrome.html b/widget/tests/test_clipboard_cache_chrome.html
index 55b6d41589..81d7a652b6 100644
--- a/widget/tests/test_clipboard_cache_chrome.html
+++ b/widget/tests/test_clipboard_cache_chrome.html
@@ -37,7 +37,12 @@ function testClipboardCache(aClipboardType, aAsync, aIsSupportGetFromCachedTrans
     addStringToTransferable("text/foo", string, trans);
     // XXX macOS caches the transferable to implement kSelectionCache type, too,
     // so it behaves differently than other types.
-    if (aClipboardType == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+    if (
+      navigator.platform.includes("Mac") &&
+      aClipboardType == clipboard.kSelectionCache &&
+      !aIsSupportGetFromCachedTransferable &&
+      !SpecialPowers.isHeadless
+    ) {
       todo_is(getClipboardData("text/foo", aClipboardType),
               aIsSupportGetFromCachedTransferable ? string : null,
               `Check text/foo data on clipboard ${aClipboardType}`);
@@ -66,7 +71,12 @@ function testClipboardCache(aClipboardType, aAsync, aIsSupportGetFromCachedTrans
        `Check text/plain data on clipboard ${aClipboardType} again`);
     // XXX macOS caches the transferable to implement kSelectionCache type, too,
     // so it behaves differently than other types.
-    if (aClipboardType == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+    if (
+      navigator.platform.includes("Mac") &&
+      aClipboardType == clipboard.kSelectionCache &&
+      !aIsSupportGetFromCachedTransferable &&
+      !SpecialPowers.isHeadless
+    ) {
       todo_is(getClipboardData("text/foo", aClipboardType),
               aIsSupportGetFromCachedTransferable ? string : null,
               `Check text/foo data on clipboard ${aClipboardType} again`);
@@ -118,7 +128,12 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
          `Check if there is text/plain flavor on clipboard ${type}`);
       // XXX macOS caches the transferable to implement kSelectionCache type, too,
       // so it behaves differently than other types.
-      if (type == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kSelectionCache &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
         todo_is(clipboard.hasDataMatchingFlavors(["text/foo"], type),
                 aIsSupportGetFromCachedTransferable,
                 `Check if there is text/foo flavor on clipboard ${type}`);
@@ -147,7 +162,12 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
          `Check if there is text/plain flavor on clipboard ${type}`);
       // XXX macOS caches the transferable to implement kSelectionCache type, too,
       // so it behaves differently than other types.
-      if (type == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kSelectionCache &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
         todo_is(clipboard.hasDataMatchingFlavors(["text/foo"], type),
                 aIsSupportGetFromCachedTransferable,
                 `Check if there is text/foo flavor on clipboard ${type}`);
@@ -212,6 +232,33 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
       await testClipboardData(await asyncGetClipboardData(type), clipboardData);
     });
 
+    add_task(async function test_flavorList_order() {
+      info(`test_flavorList_order with pref ` +
+           `${aIsSupportGetFromCachedTransferable ? "enabled" : "disabled"}`);
+
+      const trans = generateNewTransferable("text/plain", generateRandomString());
+      addStringToTransferable("text/html", `<div>${generateRandomString()}</div>`, trans);
+
+      info(`Writedata to clipboard ${type}`);
+      clipboard.setData(trans, null, type);
+
+      // Read with reverse order.
+      let flavors = trans.flavorsTransferableCanExport().reverse();
+      let request = await asyncGetClipboardData(type, flavors);
+      // XXX Not all clipboard type supports html format, e.g. kFindClipboard
+      // on macOS only support writing text/plain.
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kFindClipboard &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
+        isDeeply(request.flavorList, ["text/plain"], "check flavor orders");
+      } else {
+        isDeeply(request.flavorList, flavors, "check flavor orders");
+      }
+    });
+
     // Test sync set clipboard data.
     testClipboardCache(type, false, aIsSupportGetFromCachedTransferable);
 
diff --git a/widget/tests/test_clipboard_getDataSnapshotSync.html b/widget/tests/test_clipboard_getDataSnapshotSync.html
new file mode 100644
index 0000000000..e800f6a1b0
--- /dev/null
+++ b/widget/tests/test_clipboard_getDataSnapshotSync.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1858627
+-->
+<head>
+<title>Test for Bug 1858627</title>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="clipboard_helper.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<!-- Tests are in file_test_clipboard_getDataSnapshotSync.js -->
+<script src="file_test_clipboard_getDataSnapshotSync.js"></script>
+</body>
+</html>
diff --git a/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html b/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html
new file mode 100644
index 0000000000..fbc283ccb3
--- /dev/null
+++ b/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1858627
+-->
+<head>
+<title>Test for Bug 1858627</title>
+<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script src="clipboard_helper.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<!-- Tests are in file_test_clipboard_getDataSnapshotSync.js -->
+<script src="file_test_clipboard_getDataSnapshotSync.js"></script>
+</body>
+</html>
diff --git a/widget/tests/test_clipboard_owner_chrome.html b/widget/tests/test_clipboard_owner_chrome.html
index 4759b2b14c..2991646616 100644
--- a/widget/tests/test_clipboard_owner_chrome.html
+++ b/widget/tests/test_clipboard_owner_chrome.html
@@ -20,7 +20,7 @@ function testClipboardOwner(aClipboardType, aAsync) {
   const clipboardOwner = {
     QueryInterface: ChromeUtils.generateQI(["nsIClipboardOwner"]),
     // nsIClipboardOwner
-    LosingOwnership(aTransferable) {
+    LosingOwnership() {
       losingOwnership = true;
     },
   };
diff --git a/widget/tests/test_contextmenu_by_mouse_on_unix.html b/widget/tests/test_contextmenu_by_mouse_on_unix.html
index 2b1f643dfc..04bca8116c 100644
--- a/widget/tests/test_contextmenu_by_mouse_on_unix.html
+++ b/widget/tests/test_contextmenu_by_mouse_on_unix.html
@@ -60,7 +60,7 @@ async function process_contextmenu_event({ isMousedown, preventEvent }) {
         is(count++, 1, "The second event is contextmenu");
         e.preventDefault();
       }, { once: true });
-      target.addEventListener("mouseup", e => {
+      target.addEventListener("mouseup", () => {
         is(count++, 2, "The third event is mouseup");
 	resolve();
       }, { once: true} );
diff --git a/widget/tests/test_ime_focus_with_multiple_contenteditable.html b/widget/tests/test_ime_focus_with_multiple_contenteditable.html
new file mode 100644
index 0000000000..6b435a1a2e
--- /dev/null
+++ b/widget/tests/test_ime_focus_with_multiple_contenteditable.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1872863
+-->
+<head>
+<title>Test IME state and focus with multiple contenteditable elements</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+  <script src="file_ime_state_test_helper.js"></script>
+<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+
+<style>
+#div0 {
+  width: 200px;
+  height: 50px;
+}
+
+#div3 {
+  background-color: blue;
+  width: 200px;
+  height: 100px;
+}
+
+#div4 {
+  width: 200px;
+  height: 50px;
+}
+</style>
+<script>
+add_task(async function test_modify_contenteditable_on_focused_element() {
+  await SimpleTest.promiseFocus();
+
+  const tipWrapper = new TIPWrapper(window);
+  ok(tipWrapper.isAvailable(), "TextInputProcessor should've been initialized");
+
+  const div1 = document.getElementById("div1");
+  const div2 = document.getElementById("div2");
+  const div3 = document.getElementById("div3");
+
+  div1.addEventListener("mousedown", () => {
+    div2.contentEditable = true;
+  });
+  div3.addEventListener("mousedown", e => {
+    div2.contentEditable = false;
+    e.preventDefault();
+  });
+
+  // Set focus by mouse then contenteditable becomes true by script.
+
+  const promiseFocus = new Promise(resolve => {
+    div2.addEventListener("focus", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div1, {});
+  await promiseFocus;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_ENABLED,
+    "IMEStatus is enabled on contenteditable=true"
+  );
+  ok(tipWrapper.IMEHasFocus, "IME has focus");
+
+  // Move focus by mouse then contenteditable becomes false by script.
+
+  const promiseMouseUp = new Promise(resolve => {
+    div3.addEventListener("mouseup", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div3, {});
+  await promiseMouseUp;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_DISABLED,
+    "IMEStatus is disabled on contenteditable=false"
+  );
+  ok(!tipWrapper.IMEHasFocus, "IME losts focus after contenteditable=false");
+
+  // contenteditable changes to true on focused element.
+
+  const promiseMouseUp2 = new Promise(resolve => {
+    div1.addEventListener("mouseup", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div1, {});
+  await promiseMouseUp2;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_ENABLED,
+    "IMEStatus is enabled on contenteditable=true"
+  );
+
+  ok(tipWrapper.IMEHasFocus, "IME has focus after contenteditable=true again");
+});
+</script>
+</head>
+<body>
+<div id="div0"><div id="div1">
+<div id="div2" contenteditable="false"><div>foo</div></div>
+</div></div>
+<div id="div3"></div>
+<div id="div4" contenteditable></div>
+</body>
+</html>
diff --git a/widget/tests/test_ime_state_others_in_parent.html b/widget/tests/test_ime_state_others_in_parent.html
index e6ae0ab272..e71ef90556 100644
--- a/widget/tests/test_ime_state_others_in_parent.html
+++ b/widget/tests/test_ime_state_others_in_parent.html
@@ -96,7 +96,7 @@ function runTestPasswordFieldOnDialog() {
   WindowObserver.prototype = {
     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
 
-    observe(subject, topic, data) {
+    observe(subject, topic) {
       if (topic === "domwindowopened") {
         ok(true, "dialog window is created");
         dialog = subject;
diff --git a/widget/tests/test_key_event_counts.xhtml b/widget/tests/test_key_event_counts.xhtml
index 6eda6a52fb..e50164ddfd 100644
--- a/widget/tests/test_key_event_counts.xhtml
+++ b/widget/tests/test_key_event_counts.xhtml
@@ -24,7 +24,7 @@
     var gKeyPressEventCount = 0;
     var gKeyDownEventCount = 0;
 
-    function onKeyDown(e)
+    function onKeyDown()
     {
       gKeyDownEventCount++;
     }
diff --git a/widget/tests/test_keycodes.xhtml b/widget/tests/test_keycodes.xhtml
index aea6aaae98..5adb07b4d8 100644
--- a/widget/tests/test_keycodes.xhtml
+++ b/widget/tests/test_keycodes.xhtml
@@ -519,14 +519,14 @@ function* runKeyEventTests()
   document.addEventListener("keypress", onKeyEvent);
   document.addEventListener("keyup",    onKeyEvent);
   // Prevent almost all shortcut key handlers.
-  SpecialPowers.addSystemEventListener(document, "keypress", consumer, true);
+  SpecialPowers.wrap(document).addEventListener("keypress", consumer, { capture: true, mozSystemGroup: true });
 
   function cleanup()
   {
     document.removeEventListener("keydown",  onKeyEvent);
     document.removeEventListener("keypress", onKeyEvent);
     document.removeEventListener("keyup",    onKeyEvent);
-    SpecialPowers.removeSystemEventListener(document, "keypress", consumer, true);
+    SpecialPowers.wrap(document).removeEventListener("keypress", consumer, { capture: true, mozSystemGroup: true });
   }
 
   function* testKeysOnMac()
@@ -4802,7 +4802,7 @@ function* runAccessKeyTests()
   var button = document.getElementById("button");
   var activationCount;
 
-  function onClick(e)
+  function onClick()
   {
     ++activationCount;
   }
@@ -4968,10 +4968,10 @@ function* runXULKeyTests()
   buttonParent.addEventListener("keypress", onKeyInDefaultEventGroup, true);
   buttonParent.addEventListener("keydown", onKeyInDefaultEventGroup);
   buttonParent.addEventListener("keypress", onKeyInDefaultEventGroup);
-  SpecialPowers.addSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, true);
-  SpecialPowers.addSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, true);
-  SpecialPowers.addSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, false);
-  SpecialPowers.addSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, false);
+  SpecialPowers.wrap(buttonParent).addEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
 
   function finializeKeyElementTest()
   {
@@ -4979,10 +4979,10 @@ function* runXULKeyTests()
     buttonParent.removeEventListener("keypress", onKeyInDefaultEventGroup, true);
     buttonParent.removeEventListener("keydown", onKeyInDefaultEventGroup);
     buttonParent.removeEventListener("keypress", onKeyInDefaultEventGroup);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, true);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, true);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, false);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, false);
+    SpecialPowers.wrap(buttonParent).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
   }
 
   // If aKeyElement is empty string, this function tests if the event kicks
@@ -5218,10 +5218,10 @@ function* runReservedKeyTests()
     contents[i].addEventListener("keypress", onKeyInDefaultEventGroup, true);
     contents[i].addEventListener("keydown", onKeyInDefaultEventGroup);
     contents[i].addEventListener("keypress", onKeyInDefaultEventGroup);
-    SpecialPowers.addSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, true);
-    SpecialPowers.addSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, true);
-    SpecialPowers.addSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, false);
-    SpecialPowers.addSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, false);
+    SpecialPowers.wrap(contents[i]).addEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
   }
 
   var keyEvents = [];
@@ -5256,10 +5256,10 @@ function* runReservedKeyTests()
       contents[i].removeEventListener("keypress", onKeyInDefaultEventGroup, true);
       contents[i].removeEventListener("keydown", onKeyInDefaultEventGroup);
       contents[i].removeEventListener("keypress", onKeyInDefaultEventGroup);
-      SpecialPowers.removeSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, true);
-      SpecialPowers.removeSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, true);
-      SpecialPowers.removeSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, false);
-      SpecialPowers.removeSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, false);
+      SpecialPowers.wrap(contents[i]).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
     }
   }
 
diff --git a/widget/tests/test_native_key_bindings_mac.html b/widget/tests/test_native_key_bindings_mac.html
index 8767a5a77d..81a13aea0e 100644
--- a/widget/tests/test_native_key_bindings_mac.html
+++ b/widget/tests/test_native_key_bindings_mac.html
@@ -292,7 +292,7 @@
            aElement.id + ": Incorrect selection end");
       }
 
-      function* testRun(aElement, aSelectionCheck, aCallback) {
+      function* testRun(aElement, aSelectionCheck) {
         if (document.activeElement) {
           document.activeElement.blur();
         }
diff --git a/widget/tests/test_sizemode_events.xhtml b/widget/tests/test_sizemode_events.xhtml
index bd1e3a38d1..c1224fbf70 100644
--- a/widget/tests/test_sizemode_events.xhtml
+++ b/widget/tests/test_sizemode_events.xhtml
@@ -31,7 +31,7 @@ const kAsyncChanges = kIsLinux || kIsMacOS;
 let gSizeModeDidChange = false;
 let gSizeModeDidChangeTo = 0;
 
-function sizemodeChanged(e) {
+function sizemodeChanged() {
   gSizeModeDidChange = true;
   gSizeModeDidChangeTo = gWindow.windowState;
 }
diff --git a/widget/tests/window_bug478536.xhtml b/widget/tests/window_bug478536.xhtml
index 7318eb0bff..206226ec74 100644
--- a/widget/tests/window_bug478536.xhtml
+++ b/widget/tests/window_bug478536.xhtml
@@ -177,7 +177,7 @@ function fireWheelScrollEvent(aForward)
   }, window);
 }
 
-function onScrollView(aEvent)
+function onScrollView()
 {
   if (gIgnoreScrollEvent)
     return;
@@ -187,7 +187,7 @@ function onScrollView(aEvent)
   gTimer = setTimeout(runNextTest, 0);
 }
 
-function onMouseScrollFailed(aEvent)
+function onMouseScrollFailed()
 {
   clearTimer();
   gIgnoreScrollEvent = true;
@@ -197,7 +197,7 @@ function onMouseScrollFailed(aEvent)
   runNextTest();
 }
 
-function onTransactionTimeout(aEvent)
+function onTransactionTimeout()
 {
   if (!gTimer)
     return;
diff --git a/widget/tests/window_composition_text_querycontent.xhtml b/widget/tests/window_composition_text_querycontent.xhtml
index db3b10ea30..4806d0d187 100644
--- a/widget/tests/window_composition_text_querycontent.xhtml
+++ b/widget/tests/window_composition_text_querycontent.xhtml
@@ -6270,7 +6270,7 @@ function runQueryContentEventRelativeToInsertionPoint()
   synthesizeComposition({ type: "compositioncommitasis" });
 
   // Move start of composition at first compositionupdate event.
-  function onCompositionUpdate(aEvent)
+  function onCompositionUpdate()
   {
     startOffset = textarea.selectionStart = textarea.selectionEnd = textarea.selectionStart - 1;
     textarea.removeEventListener("compositionupdate", onCompositionUpdate);
diff --git a/widget/tests/window_imestate_iframes.html b/widget/tests/window_imestate_iframes.html
index c8b182977f..3c2d0908ae 100644
--- a/widget/tests/window_imestate_iframes.html
+++ b/widget/tests/window_imestate_iframes.html
@@ -49,6 +49,8 @@ function onUnload() {
 
 var gFocusObservingElement = null;
 var gBlurObservingElement = null;
+var canTabMoveFocusToRootElement =
+  !SpecialPowers.getBoolPref("dom.disable_tab_focus_to_root_element");
 
 function onFocus(aEvent) {
   if (aEvent.target != gFocusObservingElement) {
@@ -201,18 +203,30 @@ function runTests() {
   root = iframe.contentDocument.documentElement;
   resetFocusToInput("initializing for iframe_not_editable");
 
-  testTabKey(true, root, false, prev, true,
-             false, "input#prev[readonly] -> html");
-  testTabKey(true, editor, true, root, false,
-             true, "html -> input in the subdoc");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, prev, true,
+               false, "input#prev[readonly] -> html");
+    testTabKey(true, editor, true, root, false,
+               true, "html -> input in the subdoc");
+  } else {
+    testTabKey(true, editor, true, prev, true,
+               true, "input#prev[readonly] -> input in the subdoc");
+  }
   testTabKey(true, next, true, editor, true,
              false, "input in the subdoc -> input#next[readonly]");
   testTabKey(false, editor, true, next, true,
              true, "input#next[readonly] -> input in the subdoc");
-  testTabKey(false, root, false, editor, true,
-             false, "input in the subdoc -> html");
-  testTabKey(false, prev, true, root, false,
-             false, "html -> input#next[readonly]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, root, false, editor, true,
+               false, "input in the subdoc -> html");
+    testTabKey(false, prev, true, root, false,
+               false, "html -> input#next[readonly]");
+  } else {
+    testTabKey(false, prev, true, editor, true,
+               false, "input in the subdoc -> input#prev[readonly]");
+    testTabKey(false, next, true, prev, true,
+               false, "input#prev[readonly] -> input#next[readonly]");
+  }
 
   iframe.style.display = "none";
 
@@ -236,8 +250,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_html");
   testTabKey(true, editor, true, html, false,
              true, "html of parent -> html[contentediable=true]");
-  testTabKey(false, html, false, editor, true,
-             false, "html[contenteditable=true] -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, editor, true,
+               false, "html[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, editor, true,
+               false, "html[contenteditable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html[contenteditable=true]");
 
@@ -270,8 +289,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_designMode");
   testTabKey(true, root, false, html, false,
              true, "html of parent -> html in designMode");
-  testTabKey(false, html, false, root, false,
-             false, "html in designMode -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, root, false,
+               false, "html[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, root, false,
+               false, "html in designMode -> html of parent");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html in designMode");
 
@@ -302,8 +326,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_body");
   testTabKey(true, editor, true, html, false,
              true, "html of parent -> body[contentediable=true]");
-  testTabKey(false, html, false, editor, true,
-             false, "body[contenteditable=true] -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, editor, true,
+               false, "body[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, editor, true,
+               false, "body[contenteditable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> body[contenteditable=true]");
 
@@ -321,25 +350,44 @@ function runTests() {
   root = iframe.contentDocument.documentElement;
   resetFocusToInput("initializing for iframe_p");
 
-  testTabKey(true, root, false, prev, true,
-             false, "input#prev[readonly] -> html (has p[contenteditable=true])");
-  testTabKey(true, editor, true, root, false,
-             true, "html (has p[contenteditable=true]) -> p[contentediable=true]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, prev, true,
+               false, "input#prev[readonly] -> html (has p[contenteditable=true])");
+    testTabKey(true, editor, true, root, false,
+               true, "html (has p[contenteditable=true]) -> p[contentediable=true]");
+  } else {
+    testTabKey(true, editor, true, prev, true,
+               true, "input#prev[readonly] -> p[contenteditable=true]");
+  }
   testTabKey(true, next, true, editor, true,
              false, "p[contentediable=true] -> input#next[readonly]");
   testTabKey(false, editor, true, next, true,
              true, "input#next[readonly] -> p[contentediable=true]");
-  testTabKey(false, root, false, editor, true,
-             false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
-  testTabKey(false, prev, true, root, false,
-             false, "html (has p[contenteditable=true]) -> input#prev[readonly]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, root, false, editor, true,
+               false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
+    testTabKey(false, prev, true, root, false,
+               false, "html (has p[contenteditable=true]) -> input#prev[readonly]");
+  } else {
+    testTabKey(false, prev, true, editor, true,
+               false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
+    testTabKey(false, next, true, prev, true,
+               false, "html (has p[contenteditable=true]) -> input#next[readonly]");
+  }
   prev.style.display = "none";
 
   resetFocusToParentHTML("testing iframe_p");
-  testTabKey(true, root, false, html, false,
-             false, "html of parent -> html (has p[contentediable=true])");
-  testTabKey(false, html, false, root, false,
-             false, "html (has p[contentediable=true]) -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, html, false,
+               false, "html of parent -> html (has p[contentediable=true])");
+    testTabKey(false, html, false, root, false,
+               false, "html (has p[contentediable=true]) -> html of parent");
+  } else {
+    testTabKey(true, editor, true, html, false,
+               true, "html of parent -> p[contentediable=true]");
+    testTabKey(false, next, true, editor, true,
+               false, "p[contentediable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html (has p[contentediable=true])");
 
diff --git a/widget/tests/window_mouse_scroll_win.html b/widget/tests/window_mouse_scroll_win.html
index bf90abb1b5..48ccc1fed4 100644
--- a/widget/tests/window_mouse_scroll_win.html
+++ b/widget/tests/window_mouse_scroll_win.html
@@ -214,7 +214,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -234,7 +234,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -250,7 +250,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -270,7 +270,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -1100,7 +1100,7 @@ var gDeactiveWindowTests = [
       SpecialPowers.setIntPref(kVAmountPref, 3);
       SpecialPowers.setIntPref(kHAmountPref, 3);
     },
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       var fm = Services.focus;
       is(fm.activeWindow, gOtherWindow, "The other window isn't activated");
     },
diff --git a/widget/uikit/GfxInfo.cpp b/widget/uikit/GfxInfo.cpp
index d797e4f4a0..cb378915aa 100644
--- a/widget/uikit/GfxInfo.cpp
+++ b/widget/uikit/GfxInfo.cpp
@@ -17,9 +17,19 @@ GfxInfo::GfxInfo() {}
 
 GfxInfo::~GfxInfo() {}
 
-nsresult GfxInfo::GetD2DEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
+NS_IMETHODIMP
+GfxInfo::GetD2DEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+GfxInfo::GetDWriteEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
 
-nsresult GfxInfo::GetDWriteEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
+NS_IMETHODIMP
+GfxInfo::GetEmbeddedInFirefoxReality(bool* aEmbeddedInFirefoxReality) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetHasBattery(bool* aHasBattery) { return NS_ERROR_NOT_IMPLEMENTED; }
 
 NS_IMETHODIMP
 GfxInfo::GetDWriteVersion(nsAString& aDwriteVersion) {
@@ -32,6 +42,14 @@ GfxInfo::GetCleartypeParameters(nsAString& aCleartypeParams) {
 }
 
 NS_IMETHODIMP
+GfxInfo::GetWindowProtocol(nsAString& aWindowProtocol) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetTestType(nsAString& aTestType) { return NS_ERROR_NOT_IMPLEMENTED; }
+
+NS_IMETHODIMP
 GfxInfo::GetAdapterDescription(nsAString& aAdapterDescription) {
   return NS_ERROR_FAILURE;
 }
@@ -48,6 +66,16 @@ NS_IMETHODIMP
 GfxInfo::GetAdapterRAM2(uint32_t* aAdapterRAM) { return NS_ERROR_FAILURE; }
 
 NS_IMETHODIMP
+GfxInfo::GetAdapterDriverVendor(nsAString& aAdapterDriverVendor) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriverVendor2(nsAString& aAdapterDriverVendor2) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
 GfxInfo::GetAdapterDriver(nsAString& aAdapterDriver) {
   return NS_ERROR_FAILURE;
 }
@@ -90,7 +118,6 @@ GfxInfo::GetAdapterVendorID2(nsAString& aAdapterVendorID) {
 NS_IMETHODIMP
 GfxInfo::GetAdapterDeviceID(nsAString& aAdapterDeviceID) {
   return NS_ERROR_FAILURE;
-  return NS_OK;
 }
 
 NS_IMETHODIMP
@@ -111,12 +138,18 @@ GfxInfo::GetAdapterSubsysID2(nsAString& aAdapterSubsysID) {
 NS_IMETHODIMP
 GfxInfo::GetIsGPU2Active(bool* aIsGPU2Active) { return NS_ERROR_FAILURE; }
 
+NS_IMETHODIMP
+GfxInfo::GetDrmRenderDevice(nsACString& aDrmRenderDevice) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
 const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
   if (sDriverInfo->IsEmpty()) {
     APPEND_TO_DRIVER_BLOCKLIST2(
         OperatingSystem::Ios, DeviceFamily::All,
         nsIGfxInfo::FEATURE_OPENGL_LAYERS, nsIGfxInfo::FEATURE_STATUS_OK,
-        DRIVER_COMPARISON_IGNORED, GfxDriverInfo::allDriverVersions);
+        DRIVER_COMPARISON_IGNORED, GfxDriverInfo::allDriverVersions,
+        "FEATURE_OK_FORCE_OPENGL");
   }
 
   return *sDriverInfo;
@@ -124,7 +157,7 @@ const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
 
 nsresult GfxInfo::GetFeatureStatusImpl(
     int32_t aFeature, int32_t* aStatus, nsAString& aSuggestedDriverVersion,
-    const nsTArray<GfxDriverInfo>& aDriverInfo,
+    const nsTArray<GfxDriverInfo>& aDriverInfo, nsACString& aFailureId,
     OperatingSystem* aOS /* = nullptr */) {
   NS_ENSURE_ARG_POINTER(aStatus);
   aSuggestedDriverVersion.SetIsVoid(true);
@@ -145,7 +178,7 @@ nsresult GfxInfo::GetFeatureStatusImpl(
   }
 
   return GfxInfoBase::GetFeatureStatusImpl(
-      aFeature, aStatus, aSuggestedDriverVersion, aDriverInfo, aOS);
+      aFeature, aStatus, aSuggestedDriverVersion, aDriverInfo, aFailureId, aOS);
 }
 
 #ifdef DEBUG
diff --git a/widget/uikit/GfxInfo.h b/widget/uikit/GfxInfo.h
index fe75e28d23..55deb58544 100644
--- a/widget/uikit/GfxInfo.h
+++ b/widget/uikit/GfxInfo.h
@@ -29,18 +29,26 @@ class GfxInfo : public GfxInfoBase {
  public:
   GfxInfo();
 
+  OperatingSystem GetOperatingSystem() override { return OperatingSystem::Ios; }
+
   // We only declare the subset of nsIGfxInfo that we actually implement. The
   // rest is brought forward from GfxInfoBase.
   NS_IMETHOD GetD2DEnabled(bool* aD2DEnabled) override;
   NS_IMETHOD GetDWriteEnabled(bool* aDWriteEnabled) override;
+  NS_IMETHOD GetEmbeddedInFirefoxReality(
+      bool* aEmbeddedInFirefoxReality) override;
+  NS_IMETHOD GetHasBattery(bool* aHasBattery) override;
   NS_IMETHOD GetDWriteVersion(nsAString& aDwriteVersion) override;
   NS_IMETHOD GetCleartypeParameters(nsAString& aCleartypeParams) override;
+  NS_IMETHOD GetWindowProtocol(nsAString& aWindowProtocol) override;
+  NS_IMETHOD GetTestType(nsAString& aTestType) override;
   NS_IMETHOD GetAdapterDescription(nsAString& aAdapterDescription) override;
   NS_IMETHOD GetAdapterDriver(nsAString& aAdapterDriver) override;
   NS_IMETHOD GetAdapterVendorID(nsAString& aAdapterVendorID) override;
   NS_IMETHOD GetAdapterDeviceID(nsAString& aAdapterDeviceID) override;
   NS_IMETHOD GetAdapterSubsysID(nsAString& aAdapterSubsysID) override;
   NS_IMETHOD GetAdapterRAM(uint32_t* aAdapterRAM) override;
+  NS_IMETHOD GetAdapterDriverVendor(nsAString& aAdapterDriverVendor) override;
   NS_IMETHOD GetAdapterDriverVersion(nsAString& aAdapterDriverVersion) override;
   NS_IMETHOD GetAdapterDriverDate(nsAString& aAdapterDriverDate) override;
   NS_IMETHOD GetAdapterDescription2(nsAString& aAdapterDescription) override;
@@ -49,10 +57,12 @@ class GfxInfo : public GfxInfoBase {
   NS_IMETHOD GetAdapterDeviceID2(nsAString& aAdapterDeviceID) override;
   NS_IMETHOD GetAdapterSubsysID2(nsAString& aAdapterSubsysID) override;
   NS_IMETHOD GetAdapterRAM2(uint32_t* aAdapterRAM) override;
+  NS_IMETHOD GetAdapterDriverVendor2(nsAString& aAdapterDriverVendor) override;
   NS_IMETHOD GetAdapterDriverVersion2(
       nsAString& aAdapterDriverVersion) override;
   NS_IMETHOD GetAdapterDriverDate2(nsAString& aAdapterDriverDate) override;
   NS_IMETHOD GetIsGPU2Active(bool* aIsGPU2Active) override;
+  NS_IMETHOD GetDrmRenderDevice(nsACString& aDrmRenderDevice) override;
   using GfxInfoBase::GetFeatureStatus;
   using GfxInfoBase::GetFeatureSuggestedDriverVersion;
 
@@ -62,11 +72,12 @@ class GfxInfo : public GfxInfoBase {
 #endif
 
  protected:
-  virtual nsresult GetFeatureStatusImpl(
-      int32_t aFeature, int32_t* aStatus, nsAString& aSuggestedDriverVersion,
-      const nsTArray<GfxDriverInfo>& aDriverInfo,
-      OperatingSystem* aOS = nullptr);
-  virtual const nsTArray<GfxDriverInfo>& GetGfxDriverInfo();
+  nsresult GetFeatureStatusImpl(int32_t aFeature, int32_t* aStatus,
+                                nsAString& aSuggestedDriverVersion,
+                                const nsTArray<GfxDriverInfo>& aDriverInfo,
+                                nsACString& aFailureId,
+                                OperatingSystem* aOS = nullptr) override;
+  const nsTArray<GfxDriverInfo>& GetGfxDriverInfo() override;
 };
 
 }  // namespace widget
diff --git a/widget/uikit/MediaKeysEventSourceFactory.cpp b/widget/uikit/MediaKeysEventSourceFactory.cpp
new file mode 100644
index 0000000000..b52919d4cc
--- /dev/null
+++ b/widget/uikit/MediaKeysEventSourceFactory.cpp
@@ -0,0 +1,17 @@
+/* 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 "MediaKeysEventSourceFactory.h"
+
+namespace mozilla {
+namespace widget {
+
+mozilla::dom::MediaControlKeySource* CreateMediaControlKeySource() {
+  // GeckoView uses MediaController.webidl for media session events and control,
+  // see bug 1623715.
+  return nullptr;
+}
+
+}  // namespace widget
+}  // namespace mozilla
diff --git a/widget/uikit/TextInputHandler.h b/widget/uikit/TextInputHandler.h
new file mode 100644
index 0000000000..1f27bf11f0
--- /dev/null
+++ b/widget/uikit/TextInputHandler.h
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et 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 TextInputHandler_h_
+#define TextInputHandler_h_
+
+#import <UIKit/UITextInput.h>
+
+#include "mozilla/EventForwards.h"
+#include "mozilla/TextEventDispatcherListener.h"
+#include "mozilla/widget/IMEData.h"
+#include "nsCOMPtr.h"
+
+class nsWindow;
+
+namespace mozilla::widget {
+class TextEventDispatcher;
+
+// This is the temporary input class. When implementing UITextInpt protocol, we
+// should share this class with Cocoa's version.
+class TextInputHandler final : public TextEventDispatcherListener {
+ public:
+  explicit TextInputHandler(nsWindow* aWidget);
+  TextInputHandler() = delete;
+
+  NS_DECL_ISUPPORTS
+
+  NS_IMETHOD NotifyIME(TextEventDispatcher* aTextEventDispatcher,
+                       const IMENotification& aNotification) override;
+  NS_IMETHOD_(IMENotificationRequests) GetIMENotificationRequests() override;
+  NS_IMETHOD_(void)
+  OnRemovedFrom(TextEventDispatcher* aTextEventDispatcher) override;
+  NS_IMETHOD_(void)
+  WillDispatchKeyboardEvent(TextEventDispatcher* aTextEventDispatcher,
+                            WidgetKeyboardEvent& aKeyboardEvent,
+                            uint32_t aIndexOfKeypress, void* aData) override;
+
+  // UIKeyInput delegation
+  bool InsertText(NSString* aText);
+  bool HandleCommand(Command aCommand);
+
+  void OnDestroyed();
+
+ private:
+  virtual ~TextInputHandler() = default;
+
+  bool DispatchKeyDownEvent(uint32_t aKeyCode, KeyNameIndex aKeyNameIndex,
+                            char16_t aCharCode, nsEventStatus& aStatus);
+  bool DispatchKeyUpEvent(uint32_t aKeyCode, KeyNameIndex aKeyNameIndex,
+                          char16_t aCharCode, nsEventStatus& aStatus);
+  bool DispatchKeyPressEvent(uint32_t aKeyCode, KeyNameIndex aKeyNameIndex,
+                             char16_t aCharCode, nsEventStatus& aStatus);
+
+  bool EmulateKeyboardEvent(uint32_t aKeyCode, KeyNameIndex aKeyNameIndex,
+                            char16_t charCode);
+
+  bool Destroyed() { return !mWidget; }
+
+  nsWindow* mWidget;  // weak ref
+  RefPtr<TextEventDispatcher> mDispatcher;
+};
+
+}  // namespace mozilla::widget
+#endif
diff --git a/widget/uikit/TextInputHandler.mm b/widget/uikit/TextInputHandler.mm
new file mode 100644
index 0000000000..9a4a6ae226
--- /dev/null
+++ b/widget/uikit/TextInputHandler.mm
@@ -0,0 +1,254 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et 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 "TextInputHandler.h"
+
+#import <UIKit/UIKit.h>
+
+#include "mozilla/EventForwards.h"
+#include "mozilla/Logging.h"
+#include "mozilla/MiscEvents.h"
+#include "mozilla/TextEventDispatcher.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/WidgetUtils.h"
+#include "nsIWidget.h"
+#include "nsObjCExceptions.h"
+#include "nsString.h"
+#include "nsWindow.h"
+
+mozilla::LazyLogModule gIMELog("TextInputHandler");
+
+namespace mozilla::widget {
+
+static void GetStringForNSString(const NSString* aSrc, nsAString& aDist) {
+  NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+  if (!aSrc) {
+    aDist.Truncate();
+    return;
+  }
+
+  aDist.SetLength([aSrc length]);
+  [aSrc getCharacters:reinterpret_cast<unichar*>(aDist.BeginWriting())
+                range:NSMakeRange(0, [aSrc length])];
+
+  NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+NS_IMPL_ISUPPORTS(TextInputHandler, TextEventDispatcherListener,
+                  nsISupportsWeakReference)
+
+TextInputHandler::TextInputHandler(nsWindow* aWidget)
+    : mWidget(aWidget), mDispatcher(aWidget->GetTextEventDispatcher()) {}
+
+nsresult TextInputHandler::NotifyIME(TextEventDispatcher* aTextEventDispatcher,
+                                     const IMENotification& aNotification) {
+  return NS_OK;
+}
+
+IMENotificationRequests TextInputHandler::GetIMENotificationRequests() {
+  return IMENotificationRequests();
+}
+
+void TextInputHandler::OnRemovedFrom(
+    TextEventDispatcher* aTextEventDispatcher) {}
+
+void TextInputHandler::WillDispatchKeyboardEvent(
+    TextEventDispatcher* aTextEventDispatcher,
+    WidgetKeyboardEvent& aKeyboardEvent, uint32_t aIndexOfKeypress,
+    void* aData) {}
+
+bool TextInputHandler::InsertText(NSString* aText) {
+  nsString str;
+  GetStringForNSString(aText, str);
+
+  MOZ_LOG(gIMELog, LogLevel::Info,
+          ("%p TextInputHandler::InsertText(aText=%s)", this,
+           NS_ConvertUTF16toUTF8(str).get()));
+
+  if (Destroyed()) {
+    return false;
+  }
+
+  if (str.Length() == 1) {
+    char16_t charCode = str[0];
+    if (charCode == 0x0a) {
+      return EmulateKeyboardEvent(NS_VK_RETURN, KEY_NAME_INDEX_Enter, charCode);
+    }
+    if (charCode == 0x08) {
+      return EmulateKeyboardEvent(NS_VK_BACK, KEY_NAME_INDEX_Backspace,
+                                  charCode);
+    }
+    if (uint32_t keyCode = WidgetUtils::ComputeKeyCodeFromChar(charCode)) {
+      return EmulateKeyboardEvent(keyCode, KEY_NAME_INDEX_USE_STRING, charCode);
+    }
+  }
+
+  nsEventStatus status = nsEventStatus_eIgnore;
+  RefPtr<nsWindow> widget(mWidget);
+  if (!DispatchKeyDownEvent(NS_VK_PROCESSKEY, KEY_NAME_INDEX_Process, 0,
+                            status)) {
+    return false;
+  }
+  if (Destroyed()) {
+    return false;
+  }
+
+  mDispatcher->CommitComposition(status, &str, nullptr);
+  if (widget->Destroyed()) {
+    return false;
+  }
+
+  DispatchKeyUpEvent(NS_VK_PROCESSKEY, KEY_NAME_INDEX_Process, 0, status);
+
+  return true;
+}
+
+bool TextInputHandler::HandleCommand(Command aCommand) {
+  MOZ_LOG(gIMELog, LogLevel::Info,
+          ("%p   TextInputHandler::HandleCommand, aCommand=%s", this,
+           ToChar(aCommand)));
+
+  if (Destroyed()) {
+    return false;
+  }
+
+  if (aCommand != Command::DeleteCharBackward) {
+    return false;
+  }
+
+  nsEventStatus status = nsEventStatus_eIgnore;
+  if (!DispatchKeyDownEvent(NS_VK_BACK, KEY_NAME_INDEX_Backspace, 0, status)) {
+    return true;
+  }
+  if (Destroyed() || status == nsEventStatus_eConsumeNoDefault) {
+    return true;
+  }
+
+  // TODO: Focus check
+
+  if (!DispatchKeyPressEvent(NS_VK_BACK, KEY_NAME_INDEX_Backspace, 0, status)) {
+    return true;
+  }
+  if (Destroyed() || status == nsEventStatus_eConsumeNoDefault) {
+    return true;
+  }
+
+  // TODO: Focus check
+
+  DispatchKeyUpEvent(NS_VK_BACK, KEY_NAME_INDEX_Backspace, 0, status);
+
+  return true;
+}
+
+static uint32_t ComputeKeyModifiers(uint32_t aCharCode) {
+  if (aCharCode >= 'A' && aCharCode <= 'Z') {
+    return MODIFIER_SHIFT;
+  }
+  return 0;
+}
+
+static void InitKeyEvent(WidgetKeyboardEvent& aEvent, uint32_t aKeyCode,
+                         KeyNameIndex aKeyNameIndex, char16_t aCharCode) {
+  aEvent.mKeyCode = aKeyCode;
+  aEvent.mIsRepeat = false;
+  aEvent.mKeyNameIndex = aKeyNameIndex;
+  // TODO(m_kato):
+  // How to get native key? Then, implement NativeKeyToDOM*.h for iOS
+  aEvent.mCodeNameIndex = CODE_NAME_INDEX_UNKNOWN;
+  if (aEvent.mKeyNameIndex == KEY_NAME_INDEX_USE_STRING) {
+    aEvent.mKeyValue = aCharCode;
+  }
+  aEvent.mModifiers = ComputeKeyModifiers(aCharCode);
+  aEvent.mLocation = eKeyLocationStandard;
+  aEvent.mTimeStamp = TimeStamp::Now();
+}
+
+bool TextInputHandler::DispatchKeyDownEvent(uint32_t aKeyCode,
+                                            KeyNameIndex aKeyNameIndex,
+                                            char16_t aCharCode,
+                                            nsEventStatus& aStatus) {
+  MOZ_ASSERT(aKeyCode);
+  MOZ_ASSERT(mWidget);
+
+  WidgetKeyboardEvent keydownEvent(true, eKeyDown, mWidget);
+  InitKeyEvent(keydownEvent, aKeyCode, aKeyNameIndex, aCharCode);
+  nsresult rv = mDispatcher->BeginNativeInputTransaction();
+  if (NS_FAILED(rv)) {
+    NS_WARNING("BeginNativeInputTransaction is failed");
+    return false;
+  }
+  return mDispatcher->DispatchKeyboardEvent(eKeyDown, keydownEvent, aStatus);
+}
+
+bool TextInputHandler::DispatchKeyUpEvent(uint32_t aKeyCode,
+                                          KeyNameIndex aKeyNameIndex,
+                                          char16_t aCharCode,
+                                          nsEventStatus& aStatus) {
+  MOZ_ASSERT(aKeyCode);
+  MOZ_ASSERT(mWidget);
+
+  WidgetKeyboardEvent keyupEvent(true, eKeyUp, mWidget);
+  InitKeyEvent(keyupEvent, aKeyCode, aKeyNameIndex, aCharCode);
+  nsresult rv = mDispatcher->BeginNativeInputTransaction();
+  if (NS_FAILED(rv)) {
+    NS_WARNING("BeginNativeInputTransaction is failed");
+    return false;
+  }
+  return mDispatcher->DispatchKeyboardEvent(eKeyUp, keyupEvent, aStatus);
+}
+
+bool TextInputHandler::DispatchKeyPressEvent(uint32_t aKeyCode,
+                                             KeyNameIndex aKeyNameIndex,
+                                             char16_t aCharCode,
+                                             nsEventStatus& aStatus) {
+  MOZ_ASSERT(aKeyCode);
+  MOZ_ASSERT(mWidget);
+
+  WidgetKeyboardEvent keypressEvent(true, eKeyPress, mWidget);
+  InitKeyEvent(keypressEvent, aKeyCode, aKeyNameIndex, aCharCode);
+  nsresult rv = mDispatcher->BeginNativeInputTransaction();
+  if (NS_FAILED(rv)) {
+    NS_WARNING("BeginNativeInputTransaction is failed");
+    return false;
+  }
+  return mDispatcher->MaybeDispatchKeypressEvents(keypressEvent, aStatus);
+}
+
+bool TextInputHandler::EmulateKeyboardEvent(uint32_t aKeyCode,
+                                            KeyNameIndex aKeyNameIndex,
+                                            char16_t aCharCode) {
+  MOZ_ASSERT(aCharCode);
+
+  MOZ_LOG(gIMELog, LogLevel::Info,
+          ("%p TextInputHandler::EmulateKeyboardEvent(aKeyCode=%x, "
+           "aKeyNameIndex=%x, aCharCode=%x)",
+           this, aKeyCode, aKeyNameIndex, aCharCode));
+
+  nsEventStatus status = nsEventStatus_eIgnore;
+  if (!DispatchKeyDownEvent(aKeyCode, aKeyNameIndex, aCharCode, status)) {
+    return true;
+  }
+  if (Destroyed() || status == nsEventStatus_eConsumeNoDefault) {
+    return true;
+  }
+  // TODO: Focus check
+
+  if (!DispatchKeyPressEvent(aKeyCode, aKeyNameIndex, aCharCode, status)) {
+    return true;
+  }
+  if (Destroyed() || status == nsEventStatus_eConsumeNoDefault) {
+    return true;
+  }
+  // TODO: Focus check
+
+  DispatchKeyUpEvent(aKeyCode, aKeyNameIndex, aCharCode, status);
+  return true;
+}
+
+void TextInputHandler::OnDestroyed() { mWidget = nullptr; }
+
+}  // namespace mozilla::widget
diff --git a/widget/uikit/UIKitUtils.h b/widget/uikit/UIKitUtils.h
new file mode 100644
index 0000000000..2e34b126fd
--- /dev/null
+++ b/widget/uikit/UIKitUtils.h
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#import <UIKit/UIKit.h>
+
+#include "IMEData.h"
+
+namespace mozilla::widget {
+
+class UIKitUtils final {
+ public:
+  UIKitUtils() = delete;
+  ~UIKitUtils() = delete;
+
+  static UIKeyboardType GetUIKeyboardType(const InputContext& aContext);
+  static UIReturnKeyType GetUIReturnKeyType(const InputContext& aContext);
+  static UITextAutocapitalizationType GetUITextAutocapitalizationType(
+      const InputContext& aContext);
+};
+
+}  // namespace mozilla::widget
diff --git a/widget/uikit/UIKitUtils.mm b/widget/uikit/UIKitUtils.mm
new file mode 100644
index 0000000000..ddcd2312b0
--- /dev/null
+++ b/widget/uikit/UIKitUtils.mm
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "UIKitUtils.h"
+
+namespace mozilla::widget {
+
+// static
+UIKeyboardType UIKitUtils::GetUIKeyboardType(const InputContext& aContext) {
+  if (aContext.mHTMLInputMode.EqualsLiteral("email")) {
+    return UIKeyboardTypeEmailAddress;
+  }
+  if (aContext.mHTMLInputMode.EqualsLiteral("deciaml")) {
+    return UIKeyboardTypeDecimalPad;
+  }
+  if (aContext.mHTMLInputMode.EqualsLiteral("numeric")) {
+    return UIKeyboardTypeNumberPad;
+  }
+  if (aContext.mHTMLInputMode.EqualsLiteral("search")) {
+    return UIKeyboardTypeWebSearch;
+  }
+  if (aContext.mHTMLInputMode.EqualsLiteral("tel")) {
+    return UIKeyboardTypePhonePad;
+  }
+  if (aContext.mHTMLInputMode.EqualsLiteral("url")) {
+    return UIKeyboardTypeURL;
+  }
+
+  if (aContext.mHTMLInputType.EqualsLiteral("email")) {
+    return UIKeyboardTypeEmailAddress;
+  }
+  if (aContext.mHTMLInputType.EqualsLiteral("number")) {
+    return UIKeyboardTypeNumberPad;
+  }
+  if (aContext.mHTMLInputType.EqualsLiteral("tel")) {
+    return UIKeyboardTypePhonePad;
+  }
+  if (aContext.mHTMLInputType.EqualsLiteral("url")) {
+    return UIKeyboardTypeURL;
+  }
+
+  return UIKeyboardTypeDefault;
+}
+
+// static
+UIReturnKeyType UIKitUtils::GetUIReturnKeyType(const InputContext& aContext) {
+  if (aContext.mActionHint.EqualsLiteral("done")) {
+    return UIReturnKeyDone;
+  }
+  if (aContext.mActionHint.EqualsLiteral("go")) {
+    return UIReturnKeyGo;
+  }
+  if (aContext.mActionHint.EqualsLiteral("next") ||
+      aContext.mActionHint.EqualsLiteral("maybenext")) {
+    return UIReturnKeyNext;
+  }
+  if (aContext.mActionHint.EqualsLiteral("search")) {
+    return UIReturnKeySearch;
+  }
+  if (aContext.mActionHint.EqualsLiteral("send")) {
+    return UIReturnKeySend;
+  }
+
+  return UIReturnKeyDefault;
+}
+
+// static
+UITextAutocapitalizationType UIKitUtils::GetUITextAutocapitalizationType(
+    const InputContext& aContext) {
+  if (aContext.mAutocapitalize.EqualsLiteral("characters")) {
+    return UITextAutocapitalizationTypeAllCharacters;
+  }
+  if (aContext.mAutocapitalize.EqualsLiteral("none")) {
+    return UITextAutocapitalizationTypeNone;
+  }
+  if (aContext.mAutocapitalize.EqualsLiteral("sentences")) {
+    return UITextAutocapitalizationTypeSentences;
+  }
+  if (aContext.mAutocapitalize.EqualsLiteral("words")) {
+    return UITextAutocapitalizationTypeWords;
+  }
+  // TODO(m_kato):
+  // Infer autocapitalization type by input type like GeckoView.
+  return UITextAutocapitalizationTypeNone;
+}
+
+}  // namespace mozilla::widget
diff --git a/widget/uikit/components.conf b/widget/uikit/components.conf
new file mode 100644
index 0000000000..0a4480ee4a
--- /dev/null
+++ b/widget/uikit/components.conf
@@ -0,0 +1,28 @@
+# -*- 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/.
+
+Headers = '/widget/uikit/nsWidgetFactory.h',
+
+InitFunc = 'nsWidgetUIKitModuleCtor'
+UnloadFunc = 'nsWidgetUIKitModuleDtor'
+
+Classes = [
+    {
+        'name': 'GfxInfo',
+        'cid': '{d755a760-9f27-11df-0800-200c9a664242}',
+        'contract_ids': ['@mozilla.org/gfx/info;1'],
+        'type': 'mozilla::widget::GfxInfo',
+        'headers': ['/widget/uikit/GfxInfo.h'],
+        'init_method': 'Init',
+    },
+    {
+        'cid': '{2d96b3df-c051-11d1-a827-0040959a28c9}',
+        'contract_ids': ['@mozilla.org/widget/appshell/uikit;1'],
+        'legacy_constructor': 'nsAppShellConstructor',
+        'headers': ['/widget/uikit/nsWidgetFactory.h'],
+        'processes': ProcessSelector.ALLOW_IN_GPU_RDD_VR_SOCKET_AND_UTILITY_PROCESS,
+    },
+]
diff --git a/widget/uikit/moz.build b/widget/uikit/moz.build
index 6a3c2db994..88780c9690 100644
--- a/widget/uikit/moz.build
+++ b/widget/uikit/moz.build
@@ -7,13 +7,20 @@
 with Files("**"):
     BUG_COMPONENT = ("Core", "Widget")
 
+with Files("*TextInput*"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
 SOURCES += [
     "GfxInfo.cpp",
+    "MediaKeysEventSourceFactory.cpp",
     "nsAppShell.mm",
+    "nsBidiKeyboard.mm",
     "nsLookAndFeel.mm",
-    "nsScreenManager.mm",
+    "nsNativeThemeUIKit.mm",
     "nsWidgetFactory.mm",
     "nsWindow.mm",
+    "TextInputHandler.mm",
+    "UIKitUtils.mm",
 ]
 
 include("/ipc/chromium/chromium-config.mozbuild")
@@ -22,3 +29,11 @@ FINAL_LIBRARY = "xul"
 LOCAL_INCLUDES += [
     "/widget",
 ]
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
+
+OS_LIBS += [
+    "-framework UIKit",
+]
diff --git a/widget/uikit/nsAppShell.h b/widget/uikit/nsAppShell.h
index fd46a51025..c8ae7ce9ef 100644
--- a/widget/uikit/nsAppShell.h
+++ b/widget/uikit/nsAppShell.h
@@ -41,8 +41,8 @@ class nsAppShell : public nsBaseAppShell {
   virtual ~nsAppShell();
 
   static void ProcessGeckoEvents(void* aInfo);
-  virtual void ScheduleNativeEventCallback();
-  virtual bool ProcessNextNativeEvent(bool aMayWait);
+  void ScheduleNativeEventCallback() override;
+  bool ProcessNextNativeEvent(bool aMayWait) override;
 
   NSAutoreleasePool* mAutoreleasePool;
   AppShellDelegate* mDelegate;
diff --git a/widget/uikit/nsBidiKeyboard.h b/widget/uikit/nsBidiKeyboard.h
new file mode 100644
index 0000000000..3a9a6fe2fb
--- /dev/null
+++ b/widget/uikit/nsBidiKeyboard.h
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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 nsBidiKeyboard_h_
+#define nsBidiKeyboard_h_
+
+#include "nsIBidiKeyboard.h"
+
+class nsBidiKeyboard : public nsIBidiKeyboard {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIBIDIKEYBOARD
+
+  nsBidiKeyboard();
+
+ protected:
+  virtual ~nsBidiKeyboard();
+};
+
+#endif  // nsBidiKeyboard_h_
diff --git a/widget/uikit/nsBidiKeyboard.mm b/widget/uikit/nsBidiKeyboard.mm
new file mode 100644
index 0000000000..bbe1eff92f
--- /dev/null
+++ b/widget/uikit/nsBidiKeyboard.mm
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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 "nsBidiKeyboard.h"
+#include "nsIWidget.h"
+
+// This must be the last include:
+#include "nsObjCExceptions.h"
+
+using namespace mozilla::widget;
+
+NS_IMPL_ISUPPORTS(nsBidiKeyboard, nsIBidiKeyboard)
+
+nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard() { Reset(); }
+
+nsBidiKeyboard::~nsBidiKeyboard() {}
+
+NS_IMETHODIMP nsBidiKeyboard::Reset() { return NS_OK; }
+
+NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(bool* aIsRTL) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsBidiKeyboard::GetHaveBidiKeyboards(bool* aResult) {
+  // not implemented yet
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+// static
+already_AddRefed<nsIBidiKeyboard> nsIWidget::CreateBidiKeyboardInner() {
+  return do_AddRef(new nsBidiKeyboard());
+}
diff --git a/widget/uikit/nsLookAndFeel.h b/widget/uikit/nsLookAndFeel.h
index 7de7e0712b..c696502ec1 100644
--- a/widget/uikit/nsLookAndFeel.h
+++ b/widget/uikit/nsLookAndFeel.h
@@ -14,13 +14,13 @@ class nsLookAndFeel final : public nsXPLookAndFeel {
   virtual ~nsLookAndFeel();
 
   void NativeInit() final;
-  virtual void RefreshImpl();
-  nsresult NativeGetImpl(IntID aID, int32_t& aResult) override;
+  void RefreshImpl() override;
+  nsresult NativeGetInt(IntID aID, int32_t& aResult) override;
   nsresult NativeGetFloat(FloatID aID, float& aResult) override;
   nsresult NativeGetColor(ColorID, ColorScheme, nscolor& aResult) override;
   bool NativeGetFont(FontID aID, nsString& aFontName,
                      gfxFontStyle& aFontStyle) override;
-  virtual char16_t GetPasswordCharacterImpl() {
+  char16_t GetPasswordCharacterImpl() override {
     // unicode value for the bullet character, used for password textfields.
     return 0x2022;
   }
@@ -28,7 +28,6 @@ class nsLookAndFeel final : public nsXPLookAndFeel {
   static bool UseOverlayScrollbars() { return true; }
 
  private:
-  nscolor mColorTextSelectForeground;
   nscolor mColorDarkText;
 
   bool mInitialized;
diff --git a/widget/uikit/nsLookAndFeel.mm b/widget/uikit/nsLookAndFeel.mm
index 29eb52a234..b420cc9a1d 100644
--- a/widget/uikit/nsLookAndFeel.mm
+++ b/widget/uikit/nsLookAndFeel.mm
@@ -13,6 +13,8 @@
 #include "gfxFont.h"
 #include "gfxFontConstants.h"
 
+using namespace mozilla;
+
 nsLookAndFeel::nsLookAndFeel() : mInitialized(false) {}
 
 nsLookAndFeel::~nsLookAndFeel() {}
@@ -41,7 +43,8 @@ void nsLookAndFeel::RefreshImpl() {
   mInitialized = false;
 }
 
-nsresult nsLookAndFeel::NativeGetColor(ColorID, ColorScheme, nscolor& aResult) {
+nsresult nsLookAndFeel::NativeGetColor(ColorID aID, ColorScheme,
+                                       nscolor& aResult) {
   EnsureInit();
 
   nsresult res = NS_OK;
@@ -55,7 +58,7 @@ nsresult nsLookAndFeel::NativeGetColor(ColorID, ColorScheme, nscolor& aResult) {
       break;
     case ColorID::Highlighttext:
     case ColorID::MozMenuhovertext:
-      aResult = mColorTextSelectForeground;
+      aResult = NS_SAME_AS_FOREGROUND_COLOR;
       break;
     case ColorID::IMESelectedRawTextBackground:
     case ColorID::IMESelectedConvertedTextBackground:
@@ -154,11 +157,11 @@ nsresult nsLookAndFeel::NativeGetColor(ColorID, ColorScheme, nscolor& aResult) {
       aResult = NS_RGB(0xaa, 0xaa, 0xaa);
       break;
     case ColorID::Window:
-    case ColorID::MozField:
+    case ColorID::Field:
     case ColorID::MozCombobox:
       aResult = NS_RGB(0xff, 0xff, 0xff);
       break;
-    case ColorID::MozFieldtext:
+    case ColorID::Fieldtext:
     case ColorID::MozComboboxtext:
       aResult = mColorDarkText;
       break;
@@ -175,12 +178,6 @@ nsresult nsLookAndFeel::NativeGetColor(ColorID, ColorScheme, nscolor& aResult) {
     case ColorID::MozMacFocusring:
       aResult = NS_RGB(0x3F, 0x98, 0xDD);
       break;
-    case ColorID::MozMacMenutextdisable:
-      aResult = NS_RGB(0x88, 0x88, 0x88);
-      break;
-    case ColorID::MozMacMenutextselect:
-      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
-      break;
     case ColorID::MozMacDisabledtoolbartext:
       aResult = NS_RGB(0x3F, 0x3F, 0x3F);
       break;
@@ -260,6 +257,19 @@ nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
     case IntID::ScrollArrowStyle:
       aResult = eScrollArrow_None;
       break;
+    case IntID::UseOverlayScrollbars:
+    case IntID::AllowOverlayScrollbarsOverlap:
+      aResult = 1;
+      break;
+    case IntID::ScrollbarDisplayOnMouseMove:
+      aResult = 0;
+      break;
+    case IntID::ScrollbarFadeBeginDelay:
+      aResult = 450;
+      break;
+    case IntID::ScrollbarFadeDuration:
+      aResult = 200;
+      break;
     case IntID::TreeOpenDelay:
       aResult = 1000;
       break;
@@ -326,10 +336,10 @@ nsLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
 bool nsLookAndFeel::NativeGetFont(FontID aID, nsString& aFontName,
                                   gfxFontStyle& aFontStyle) {
   // hack for now
-  if (aID == FontID::Window || aID == FontID::Document) {
-    aFontStyle.style = FontSlantStyle::Normal();
-    aFontStyle.weight = FontWeight::Normal();
-    aFontStyle.stretch = FontStretch::Normal();
+  if (aID == FontID::Caption || aID == FontID::Menu) {
+    aFontStyle.style = FontSlantStyle::NORMAL;
+    aFontStyle.weight = FontWeight::NORMAL;
+    aFontStyle.stretch = FontStretch::NORMAL;
     aFontStyle.size = 14;
     aFontStyle.systemFont = true;
 
@@ -347,14 +357,6 @@ void nsLookAndFeel::EnsureInit() {
   }
   mInitialized = true;
 
-  nscolor color;
-  GetColor(ColorID::TextSelectBackground, color);
-  if (color == 0x000000) {
-    mColorTextSelectForeground = NS_RGB(0xff, 0xff, 0xff);
-  } else {
-    mColorTextSelectForeground = NS_SAME_AS_FOREGROUND_COLOR;
-  }
-
   mColorDarkText = GetColorFromUIColor([UIColor darkTextColor]);
 
   RecordTelemetry();
diff --git a/widget/uikit/nsNativeThemeUIKit.h b/widget/uikit/nsNativeThemeUIKit.h
new file mode 100644
index 0000000000..87c631a8b8
--- /dev/null
+++ b/widget/uikit/nsNativeThemeUIKit.h
@@ -0,0 +1,21 @@
+/* -*- 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 nsNativeThemeUIKit_h
+#define nsNativeThemeUIKit_h
+
+#include "nsITheme.h"
+#include "Theme.h"
+
+class nsNativeThemeUIKit final : public mozilla::widget::Theme {
+ public:
+  nsNativeThemeUIKit();
+
+ protected:
+  virtual ~nsNativeThemeUIKit() = default;
+};
+
+#endif  // nsNativeThemeUIKit_h
diff --git a/widget/uikit/nsNativeThemeUIKit.mm b/widget/uikit/nsNativeThemeUIKit.mm
new file mode 100644
index 0000000000..19cde52426
--- /dev/null
+++ b/widget/uikit/nsNativeThemeUIKit.mm
@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsNativeThemeUIKit.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::widget;
+
+nsNativeThemeUIKit::nsNativeThemeUIKit() : Theme(ScrollbarStyle()) {}
+
+already_AddRefed<Theme> do_CreateNativeThemeDoNotUseDirectly() {
+  if (gfxPlatform::IsHeadless()) {
+    return do_AddRef(new Theme(Theme::ScrollbarStyle()));
+  }
+  return do_AddRef(new nsNativeThemeUIKit());
+}
diff --git a/widget/uikit/nsScreenManager.h b/widget/uikit/nsScreenManager.h
deleted file mode 100644
index 0d19728264..0000000000
--- a/widget/uikit/nsScreenManager.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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 nsScreenManager_h_
-#define nsScreenManager_h_
-
-#include "nsBaseScreen.h"
-#include "nsIScreenManager.h"
-#include "nsCOMPtr.h"
-#include "nsRect.h"
-
-@class UIScreen;
-
-class UIKitScreen : public nsBaseScreen {
- public:
-  explicit UIKitScreen(UIScreen* screen);
-  ~UIKitScreen() {}
-
-  NS_IMETHOD GetId(uint32_t* outId) override {
-    *outId = 0;
-    return NS_OK;
-  }
-
-  NS_IMETHOD GetRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
-                     int32_t* aHeight) override;
-  NS_IMETHOD GetAvailRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
-                          int32_t* aHeight) override;
-  NS_IMETHOD GetRectDisplayPix(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
-                               int32_t* aHeight) override;
-  NS_IMETHOD GetAvailRectDisplayPix(int32_t* aLeft, int32_t* aTop,
-                                    int32_t* aWidth, int32_t* aHeight) override;
-  NS_IMETHOD GetPixelDepth(int32_t* aPixelDepth) override;
-  NS_IMETHOD GetColorDepth(int32_t* aColorDepth) override;
-  NS_IMETHOD GetContentsScaleFactor(double* aContentsScaleFactor) override;
-  NS_IMETHOD GetDefaultCSSScaleFactor(double* aScaleFactor) override {
-    return GetContentsScaleFactor(aScaleFactor);
-  }
-
- private:
-  UIScreen* mScreen;
-};
-
-class UIKitScreenManager : public nsIScreenManager {
- public:
-  UIKitScreenManager();
-
-  NS_DECL_ISUPPORTS
-
-  NS_DECL_NSISCREENMANAGER
-
-  static LayoutDeviceIntRect GetBounds();
-
- private:
-  virtual ~UIKitScreenManager() {}
-  // TODO: support >1 screen, iPad supports external displays
-  nsCOMPtr<nsIScreen> mScreen;
-};
-
-#endif  // nsScreenManager_h_
diff --git a/widget/uikit/nsScreenManager.mm b/widget/uikit/nsScreenManager.mm
deleted file mode 100644
index da37a4199d..0000000000
--- a/widget/uikit/nsScreenManager.mm
+++ /dev/null
@@ -1,104 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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/. */
-
-#import <UIKit/UIScreen.h>
-
-#include "gfxPoint.h"
-#include "nsScreenManager.h"
-#include "nsAppShell.h"
-
-static LayoutDeviceIntRect gScreenBounds;
-static bool gScreenBoundsSet = false;
-
-UIKitScreen::UIKitScreen(UIScreen* aScreen) { mScreen = [aScreen retain]; }
-
-NS_IMETHODIMP
-UIKitScreen::GetRect(int32_t* outX, int32_t* outY, int32_t* outWidth,
-                     int32_t* outHeight) {
-  return GetRectDisplayPix(outX, outY, outWidth, outHeight);
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetAvailRect(int32_t* outX, int32_t* outY, int32_t* outWidth,
-                          int32_t* outHeight) {
-  return GetAvailRectDisplayPix(outX, outY, outWidth, outHeight);
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetRectDisplayPix(int32_t* outX, int32_t* outY, int32_t* outWidth,
-                               int32_t* outHeight) {
-  nsIntRect rect = UIKitScreenManager::GetBounds();
-  *outX = rect.x;
-  *outY = rect.y;
-  *outWidth = rect.width;
-  *outHeight = rect.height;
-
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetAvailRectDisplayPix(int32_t* outX, int32_t* outY,
-                                    int32_t* outWidth, int32_t* outHeight) {
-  CGRect rect = [mScreen applicationFrame];
-  CGFloat scale = [mScreen scale];
-
-  *outX = rect.origin.x * scale;
-  *outY = rect.origin.y * scale;
-  *outWidth = rect.size.width * scale;
-  *outHeight = rect.size.height * scale;
-
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetPixelDepth(int32_t* aPixelDepth) {
-  // Close enough.
-  *aPixelDepth = 24;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetColorDepth(int32_t* aColorDepth) {
-  return GetPixelDepth(aColorDepth);
-}
-
-NS_IMETHODIMP
-UIKitScreen::GetContentsScaleFactor(double* aContentsScaleFactor) {
-  *aContentsScaleFactor = [mScreen scale];
-  return NS_OK;
-}
-
-NS_IMPL_ISUPPORTS(UIKitScreenManager, nsIScreenManager)
-
-UIKitScreenManager::UIKitScreenManager()
-    : mScreen(new UIKitScreen([UIScreen mainScreen])) {}
-
-LayoutDeviceIntRect UIKitScreenManager::GetBounds() {
-  if (!gScreenBoundsSet) {
-    CGRect rect = [[UIScreen mainScreen] bounds];
-    CGFloat scale = [[UIScreen mainScreen] scale];
-    gScreenBounds.x = rect.origin.x * scale;
-    gScreenBounds.y = rect.origin.y * scale;
-    gScreenBounds.width = rect.size.width * scale;
-    gScreenBounds.height = rect.size.height * scale;
-    gScreenBoundsSet = true;
-  }
-  printf("UIKitScreenManager::GetBounds: %d %d %d %d\n", gScreenBounds.x,
-         gScreenBounds.y, gScreenBounds.width, gScreenBounds.height);
-  return gScreenBounds;
-}
-
-NS_IMETHODIMP
-UIKitScreenManager::GetPrimaryScreen(nsIScreen** outScreen) {
-  NS_IF_ADDREF(*outScreen = mScreen.get());
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-UIKitScreenManager::ScreenForRect(int32_t inLeft, int32_t inTop,
-                                  int32_t inWidth, int32_t inHeight,
-                                  nsIScreen** outScreen) {
-  return GetPrimaryScreen(outScreen);
-}
diff --git a/widget/uikit/nsWidgetFactory.h b/widget/uikit/nsWidgetFactory.h
new file mode 100644
index 0000000000..570639e495
--- /dev/null
+++ b/widget/uikit/nsWidgetFactory.h
@@ -0,0 +1,21 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* 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 widget_uikit_nsWidgetFactory_h
+#define widget_uikit_nsWidgetFactory_h
+
+#include "nscore.h"
+#include "nsID.h"
+
+class nsISupports;
+
+nsresult nsAppShellConstructor(const nsIID& iid, void** result);
+
+void nsWidgetUIKitModuleCtor();
+void nsWidgetUIKitModuleDtor();
+
+#endif  // defined widget_uikit_nsWidgetFactory_h
diff --git a/widget/uikit/nsWidgetFactory.mm b/widget/uikit/nsWidgetFactory.mm
index 356e5b8cdf..e5b24d200f 100644
--- a/widget/uikit/nsWidgetFactory.mm
+++ b/widget/uikit/nsWidgetFactory.mm
@@ -3,51 +3,18 @@
  * 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 "nsISupports.h"
-#include "mozilla/ModuleUtils.h"
-
-#include "nsWidgetsCID.h"
-
 #include "nsAppShell.h"
 #include "nsAppShellSingleton.h"
 #include "nsLookAndFeel.h"
-#include "nsScreenManager.h"
-
-NS_GENERIC_FACTORY_CONSTRUCTOR(UIKitScreenManager)
+#include "nsWidgetFactory.h"
+#include "mozilla/WidgetUtils.h"
 
-#include "GfxInfo.h"
-namespace mozilla {
-namespace widget {
-// This constructor should really be shared with all platforms.
-NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(GfxInfo, Init)
-}  // namespace widget
-}  // namespace mozilla
+using namespace mozilla::widget;
 
-NS_DEFINE_NAMED_CID(NS_APPSHELL_CID);
-NS_DEFINE_NAMED_CID(NS_SCREENMANAGER_CID);
-NS_DEFINE_NAMED_CID(NS_GFXINFO_CID);
+void nsWidgetUIKitModuleCtor() { nsAppShellInit(); }
 
-static const mozilla::Module::CIDEntry kWidgetCIDs[] = {
-    {&kNS_APPSHELL_CID, false, nullptr, nsAppShellConstructor},
-    {&kNS_SCREENMANAGER_CID, false, nullptr, UIKitScreenManagerConstructor},
-    {&kNS_GFXINFO_CID, false, nullptr, mozilla::widget::GfxInfoConstructor},
-    {nullptr}};
-
-static const mozilla::Module::ContractIDEntry kWidgetContracts[] = {
-    {"@mozilla.org/widget/appshell/uikit;1", &kNS_APPSHELL_CID},
-    {"@mozilla.org/gfx/screenmanager;1", &kNS_SCREENMANAGER_CID},
-    {"@mozilla.org/gfx/info;1", &kNS_GFXINFO_CID},
-    {nullptr}};
-
-static void nsWidgetUIKitModuleDtor() {
+void nsWidgetUIKitModuleDtor() {
+  WidgetUtils::Shutdown();
   nsLookAndFeel::Shutdown();
   nsAppShellShutdown();
 }
-
-extern const mozilla::Module kWidgetModule = {mozilla::Module::kVersion,
-                                              kWidgetCIDs,
-                                              kWidgetContracts,
-                                              nullptr,
-                                              nullptr,
-                                              nsAppShellInit,
-                                              nsWidgetUIKitModuleDtor};
diff --git a/widget/uikit/nsWindow.h b/widget/uikit/nsWindow.h
index 5dad452930..cb5d676d7c 100644
--- a/widget/uikit/nsWindow.h
+++ b/widget/uikit/nsWindow.h
@@ -15,6 +15,10 @@
 @class UIView;
 @class ChildView;
 
+namespace mozilla::widget {
+class TextInputHandler;
+}
+
 class nsWindow final : public nsBaseWidget {
   typedef nsBaseWidget Inherited;
 
@@ -27,49 +31,47 @@ class nsWindow final : public nsBaseWidget {
   // nsIWidget
   //
 
-  [[nodiscard]] virtual nsresult Create(
+  [[nodiscard]] nsresult Create(
       nsIWidget* aParent, nsNativeWidget aNativeParent,
       const LayoutDeviceIntRect& aRect,
-      widget::InitData* aInitData = nullptr) override;
-  virtual void Destroy() override;
-  virtual void Show(bool aState) override;
-  virtual void Enable(bool aState) override {}
-  virtual bool IsEnabled() const override { return true; }
-  virtual bool IsVisible() const override { return mVisible; }
-  virtual void SetFocus(Raise, mozilla::dom::CallerType aCallerType) override;
-  virtual LayoutDeviceIntPoint WidgetToScreenOffset() override;
-
-  virtual void SetBackgroundColor(const nscolor& aColor) override;
-  virtual void* GetNativeData(uint32_t aDataType) override;
-
-  virtual void Move(double aX, double aY) override;
-  virtual nsSizeMode SizeMode() override { return mSizeMode; }
-  virtual void SetSizeMode(nsSizeMode aMode) override;
+      mozilla::widget::InitData* aInitData = nullptr) override;
+  void Destroy() override;
+  void Show(bool aState) override;
+  void Enable(bool aState) override {}
+  bool IsEnabled() const override { return true; }
+  bool IsVisible() const override { return mVisible; }
+  void SetFocus(Raise, mozilla::dom::CallerType aCallerType) override;
+  LayoutDeviceIntPoint WidgetToScreenOffset() override;
+
+  void SetBackgroundColor(const nscolor& aColor) override;
+  void* GetNativeData(uint32_t aDataType) override;
+
+  void Move(double aX, double aY) override;
+  nsSizeMode SizeMode() override { return mSizeMode; }
+  void SetSizeMode(nsSizeMode aMode) override;
   void EnteredFullScreen(bool aFullScreen);
-  virtual void Resize(double aWidth, double aHeight, bool aRepaint) override;
-  virtual void Resize(double aX, double aY, double aWidth, double aHeight,
-                      bool aRepaint) override;
-  virtual LayoutDeviceIntRect GetScreenBounds() override;
+  void Resize(double aWidth, double aHeight, bool aRepaint) override;
+  void Resize(double aX, double aY, double aWidth, double aHeight,
+              bool aRepaint) override;
+  LayoutDeviceIntRect GetScreenBounds() override;
   void ReportMoveEvent();
   void ReportSizeEvent();
   void ReportSizeModeEvent(nsSizeMode aMode);
 
   CGFloat BackingScaleFactor();
   void BackingScaleFactorChanged();
-  virtual float GetDPI() override {
+  float GetDPI() override {
     // XXX: terrible
     return 326.0f;
   }
-  virtual double GetDefaultScaleInternal() override {
-    return BackingScaleFactor();
-  }
-  virtual int32_t RoundsWidgetCoordinatesTo() override;
+  double GetDefaultScaleInternal() override { return BackingScaleFactor(); }
+  int32_t RoundsWidgetCoordinatesTo() override;
 
-  virtual nsresult SetTitle(const nsAString& aTitle) override { return NS_OK; }
+  nsresult SetTitle(const nsAString& aTitle) override { return NS_OK; }
 
-  virtual void Invalidate(const LayoutDeviceIntRect& aRect) override;
-  virtual nsresult DispatchEvent(mozilla::WidgetGUIEvent* aEvent,
-                                 nsEventStatus& aStatus) override;
+  void Invalidate(const LayoutDeviceIntRect& aRect) override;
+  nsresult DispatchEvent(mozilla::WidgetGUIEvent* aEvent,
+                         nsEventStatus& aStatus) override;
 
   void WillPaintWindow();
   bool PaintWindow(LayoutDeviceIntRegion aRegion);
@@ -78,9 +80,16 @@ class nsWindow final : public nsBaseWidget {
 
   // virtual nsresult
   // NotifyIME(const IMENotification& aIMENotification) override;
-  virtual void SetInputContext(const InputContext& aContext,
-                               const InputContextAction& aAction);
-  virtual InputContext GetInputContext();
+  void SetInputContext(const InputContext& aContext,
+                       const InputContextAction& aAction) override;
+  InputContext GetInputContext() override;
+  TextEventDispatcherListener* GetNativeTextEventDispatcherListener() override;
+
+  mozilla::widget::TextInputHandler* GetTextInputHandler() const {
+    return mTextInputHandler;
+  }
+  bool IsVirtualKeyboardDisabled() const;
+
   /*
   virtual bool ExecuteNativeKeyBinding(
                       NativeKeyBindingsType aType,
@@ -104,7 +113,9 @@ class nsWindow final : public nsBaseWidget {
   nsSizeMode mSizeMode;
   nsTArray<nsWindow*> mChildren;
   nsWindow* mParent;
-  InputContext mInputContext;
+
+  mozilla::widget::InputContext mInputContext;
+  RefPtr<mozilla::widget::TextInputHandler> mTextInputHandler;
 
   void OnSizeChanged(const mozilla::gfx::IntSize& aSize);
 
diff --git a/widget/uikit/nsWindow.mm b/widget/uikit/nsWindow.mm
index 0c1a38c27c..51b317ee61 100644
--- a/widget/uikit/nsWindow.mm
+++ b/widget/uikit/nsWindow.mm
@@ -4,6 +4,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #import <UIKit/UIEvent.h>
+#import <UIKit/UIKit.h>
 #import <UIKit/UIGraphics.h>
 #import <UIKit/UIInterface.h>
 #import <UIKit/UIScreen.h>
@@ -17,29 +18,41 @@
 #include <algorithm>
 
 #include "nsWindow.h"
-#include "nsScreenManager.h"
 #include "nsAppShell.h"
+#ifdef ACCESSIBILITY
+#  include "nsAccessibilityService.h"
+#  include "mozilla/a11y/LocalAccessible.h"
+#endif
 
 #include "nsWidgetsCID.h"
 #include "nsGfxCIID.h"
 
+#include "gfxPlatform.h"
 #include "gfxQuartzSurface.h"
 #include "gfxUtils.h"
 #include "gfxImageSurface.h"
 #include "gfxContext.h"
+#include "nsObjCExceptions.h"
 #include "nsRegion.h"
-#include "Layers.h"
 #include "nsTArray.h"
+#include "TextInputHandler.h"
+#include "UIKitUtils.h"
 
 #include "mozilla/BasicEvents.h"
 #include "mozilla/ProfilerLabels.h"
 #include "mozilla/TouchEvents.h"
 #include "mozilla/Unused.h"
 #include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/gfx/Logging.h"
+#ifdef ACCESSIBILITY
+#  include "mozilla/a11y/MUIRootAccessibleProtocol.h"
+#endif
 
 using namespace mozilla;
-using namespace mozilla::dom;
+using namespace mozilla::gfx;
 using namespace mozilla::layers;
+using mozilla::dom::Touch;
+using mozilla::widget::UIKitUtils;
 
 #define ALOG(args...)    \
   fprintf(stderr, args); \
@@ -62,18 +75,22 @@ static CGRect DevPixelsToUIKitPoints(const LayoutDeviceIntRect& aRect,
 // Used to retain a Cocoa object for the remainder of a method's execution.
 class nsAutoRetainUIKitObject {
  public:
-  nsAutoRetainUIKitObject(id anObject) { mObject = [anObject retain]; }
+  explicit nsAutoRetainUIKitObject(id anObject) { mObject = [anObject retain]; }
   ~nsAutoRetainUIKitObject() { [mObject release]; }
 
  private:
   id mObject;  // [STRONG]
 };
 
-@interface ChildView : UIView {
+#ifdef ACCESSIBILITY
+@interface ChildView : UIView <UIKeyInput, MUIRootAccessibleProtocol> {
+#else
+@interface ChildView : UIView <UIKeyInput> {
+#endif
  @public
   nsWindow* mGeckoChild;  // weak ref
   BOOL mWaitingForPaint;
-  CFMutableDictionaryRef mTouches;
+  NSMapTable<UITouch*, NSNumber*>* mTouches;
   int mNextTouchID;
 }
 // sets up our view, attaching it to its owning gecko view
@@ -93,10 +110,32 @@ class nsAutoRetainUIKitObject {
                touches:(NSSet*)aTouches
                 widget:(nsWindow*)aWindow;
 // Event handling (UIResponder)
-- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
-- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event;
-- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event;
-- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event;
+- (void)touchesBegan:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event;
+- (void)touchesCancelled:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event;
+- (void)touchesEnded:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event;
+- (void)touchesMoved:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event;
+
+- (void)activateWindow:(NSNotification*)notification;
+- (void)deactivateWindow:(NSNotification*)notification;
+
+#ifdef ACCESSIBILITY
+// MUIRootAccessible
+- (BOOL)hasRepresentedView;
+- (id)representedView;
+
+// MUIAccessible
+- (BOOL)isAccessibilityElement;
+- (NSString*)accessibilityLabel;
+- (CGRect)accessibilityFrame;
+- (NSString*)accessibilityValue;
+- (uint64_t)accessibilityTraits;
+- (NSInteger)accessibilityElementCount;
+- (nullable id)accessibilityElementAtIndex:(NSInteger)index;
+- (NSInteger)indexOfAccessibilityElement:(id)element;
+- (NSArray* _Nullable)accessibilityElements;
+- (UIAccessibilityContainerType)accessibilityContainerType;
+#endif
+
 @end
 
 @implementation ChildView
@@ -120,15 +159,29 @@ class nsAutoRetainUIKitObject {
   tapRecognizer.numberOfTapsRequired = 1;
   [self addGestureRecognizer:tapRecognizer];
 
-  mTouches =
-      CFDictionaryCreateMutable(kCFAllocatorDefault, 0, nullptr, nullptr);
+  mTouches = [[NSMapTable alloc] init];
   mNextTouchID = 0;
+
+  // This is managed with weak references by the notification center so that we
+  // do not need to call removeObserver.
+  // https://developer.apple.com/documentation/foundation/nsnotificationcenter/1415360-addobserver#discussion
+  [[NSNotificationCenter defaultCenter]
+      addObserver:self
+         selector:@selector(activateWindow:)
+             name:UIWindowDidBecomeKeyNotification
+           object:nil];
+  [[NSNotificationCenter defaultCenter]
+      addObserver:self
+         selector:@selector(deactivateWindow:)
+             name:UIWindowDidResignKeyNotification
+           object:nil];
+
   return self;
 }
 
 - (void)widgetDestroyed {
   mGeckoChild = nullptr;
-  CFRelease(mTouches);
+  [mTouches release];
 }
 
 - (void)delayedTearDown {
@@ -136,6 +189,30 @@ class nsAutoRetainUIKitObject {
   [self release];
 }
 
+- (void)activateWindow:(NSNotification*)notification {
+  ALOG("[[ChildView[%p] activateWindow]", (void*)self);
+
+  if (!mGeckoChild) {
+    return;
+  }
+
+  if (nsIWidgetListener* listener = mGeckoChild->GetWidgetListener()) {
+    listener->WindowActivated();
+  }
+}
+
+- (void)deactivateWindow:(NSNotification*)notification {
+  ALOG("[[ChildView[%p] deactivateWindow]", (void*)self);
+
+  if (!mGeckoChild) {
+    return;
+  }
+
+  if (nsIWidgetListener* listener = mGeckoChild->GetWidgetListener()) {
+    listener->WindowDeactivated();
+  }
+}
+
 - (void)sendMouseEvent:(EventMessage)aType
                  point:(LayoutDeviceIntPoint)aPoint
                 widget:(nsWindow*)aWindow {
@@ -144,9 +221,8 @@ class nsAutoRetainUIKitObject {
 
   event.mRefPoint = aPoint;
   event.mClickCount = 1;
-  event.button = MouseButton::ePrimary;
-  event.mTime = PR_IntervalNow();
-  event.inputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+  event.mButton = MouseButton::ePrimary;
+  event.mInputSource = mozilla::dom::MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
 
   nsEventStatus status;
   aWindow->DispatchEvent(&event, status);
@@ -169,20 +245,20 @@ class nsAutoRetainUIKitObject {
   WidgetTouchEvent event(true, aType, aWindow);
   // XXX: I think nativeEvent.timestamp * 1000 is probably usable here but
   // I don't care that much right now.
-  event.mTime = PR_IntervalNow();
   event.mTouches.SetCapacity(aTouches.count);
   for (UITouch* touch in aTouches) {
     LayoutDeviceIntPoint loc = UIKitPointsToDevPixels(
         [touch locationInView:self], [self contentScaleFactor]);
-    LayoutDeviceIntPoint radius =
-        UIKitPointsToDevPixels([touch majorRadius], [touch majorRadius]);
-    void* value;
-    if (!CFDictionaryGetValueIfPresent(mTouches, touch, (const void**)&value)) {
+    LayoutDeviceIntPoint radius = UIKitPointsToDevPixels(
+        CGPointMake([touch majorRadius], [touch majorRadius]),
+        [self contentScaleFactor]);
+    NSNumber* value = [mTouches objectForKey:touch];
+    if (value == nil) {
       // This shouldn't happen.
       NS_ASSERTION(false, "Got a touch that we didn't know about");
       continue;
     }
-    int id = reinterpret_cast<int>(value);
+    int id = [value intValue];
     RefPtr<Touch> t = new Touch(id, loc, radius, 0.0f, 1.0f);
     event.mRefPoint = loc;
     event.mTouches.AppendElement(t);
@@ -190,12 +266,12 @@ class nsAutoRetainUIKitObject {
   aWindow->DispatchInputEvent(&event);
 }
 
-- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
+- (void)touchesBegan:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event {
   ALOG("[ChildView[%p] touchesBegan", self);
   if (!mGeckoChild) return;
 
   for (UITouch* touch : touches) {
-    CFDictionaryAddValue(mTouches, touch, (void*)mNextTouchID);
+    [mTouches setObject:[NSNumber numberWithInt:mNextTouchID] forKey:touch];
     mNextTouchID++;
   }
   [self sendTouchEvent:eTouchStart
@@ -203,31 +279,31 @@ class nsAutoRetainUIKitObject {
                 widget:mGeckoChild];
 }
 
-- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
+- (void)touchesCancelled:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event {
   ALOG("[ChildView[%p] touchesCancelled", self);
   [self sendTouchEvent:eTouchCancel touches:touches widget:mGeckoChild];
   for (UITouch* touch : touches) {
-    CFDictionaryRemoveValue(mTouches, touch);
+    [mTouches removeObjectForKey:touch];
   }
-  if (CFDictionaryGetCount(mTouches) == 0) {
+  if (mTouches.count == 0) {
     mNextTouchID = 0;
   }
 }
 
-- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
+- (void)touchesEnded:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event {
   ALOG("[ChildView[%p] touchesEnded", self);
   if (!mGeckoChild) return;
 
   [self sendTouchEvent:eTouchEnd touches:touches widget:mGeckoChild];
   for (UITouch* touch : touches) {
-    CFDictionaryRemoveValue(mTouches, touch);
+    [mTouches removeObjectForKey:touch];
   }
-  if (CFDictionaryGetCount(mTouches) == 0) {
+  if (mTouches.count == 0) {
     mNextTouchID = 0;
   }
 }
 
-- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
+- (void)touchesMoved:(NSSet<UITouch*>*)touches withEvent:(UIEvent*)event {
   ALOG("[ChildView[%p] touchesMoved", self);
   if (!mGeckoChild) return;
 
@@ -236,6 +312,17 @@ class nsAutoRetainUIKitObject {
                 widget:mGeckoChild];
 }
 
+- (BOOL)canBecomeFirstResponder {
+  if (!mGeckoChild) {
+    return NO;
+  }
+
+  if (mGeckoChild->IsVirtualKeyboardDisabled()) {
+    return NO;
+  }
+  return YES;
+}
+
 - (void)setNeedsDisplayInRect:(CGRect)aRect {
   if ([self isUsingMainThreadOpenGL]) {
     // Draw without calling drawRect. This prevent us from
@@ -326,7 +413,8 @@ class nsAutoRetainUIKitObject {
   CGContextScaleCTM(aContext, 1.0 / scale, 1.0 / scale);
 
   CGSize viewSize = [self bounds].size;
-  gfx::IntSize backingSize(viewSize.width * scale, viewSize.height * scale);
+  gfx::IntSize backingSize(NSToIntRound(viewSize.width * scale),
+                           NSToIntRound(viewSize.height * scale));
 
   CGContextSaveGState(aContext);
 
@@ -339,13 +427,12 @@ class nsAutoRetainUIKitObject {
   // Create Cairo objects.
   RefPtr<gfxQuartzSurface> targetSurface;
 
-  UniquePtrPtr<gfxContext> targetContext;
+  UniquePtr<gfxContext> targetContext;
   if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(
           gfx::BackendType::CAIRO)) {
     // This is dead code unless you mess with prefs, but keep it around for
     // debugging.
     targetSurface = new gfxQuartzSurface(aContext, backingSize);
-    targetSurface->SetAllowUseAsSource(false);
     RefPtr<gfx::DrawTarget> dt =
         gfxPlatform::CreateDrawTargetForSurface(targetSurface, backingSize);
     if (!dt || !dt->IsValid()) {
@@ -399,6 +486,183 @@ class nsAutoRetainUIKitObject {
   CGContextStrokeRect(aContext, aRect);
 #endif
 }
+
+// UIKeyInput
+
+- (void)insertText:(NSString*)text {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return;
+  }
+  widget::TextInputHandler* textInputHandler =
+      mGeckoChild->GetTextInputHandler();
+  if (!textInputHandler) {
+    return;
+  }
+  textInputHandler->InsertText(text);
+}
+
+- (void)deleteBackward {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return;
+  }
+  widget::TextInputHandler* textInputHandler =
+      mGeckoChild->GetTextInputHandler();
+  if (!textInputHandler) {
+    return;
+  }
+  textInputHandler->HandleCommand(Command::DeleteCharBackward);
+}
+
+- (BOOL)hasText {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return NO;
+  }
+  widget::InputContext context = mGeckoChild->GetInputContext();
+  if (context.mIMEState.mEnabled == mozilla::widget::IMEEnabled::Disabled) {
+    return NO;
+  }
+  return YES;
+}
+
+// UITextInputTraits
+
+- (UIKeyboardType)keyboardType {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return UIKeyboardTypeDefault;
+  }
+  return UIKitUtils::GetUIKeyboardType(mGeckoChild->GetInputContext());
+}
+
+- (UIReturnKeyType)returnKeyType {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return UIReturnKeyDefault;
+  }
+  return UIKitUtils::GetUIReturnKeyType(mGeckoChild->GetInputContext());
+}
+
+- (UITextAutocapitalizationType)autocapitalizationType {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return UITextAutocapitalizationTypeNone;
+  }
+  return UIKitUtils::GetUITextAutocapitalizationType(
+      mGeckoChild->GetInputContext());
+}
+
+- (BOOL)isSecureTextEntry {
+  if (!mGeckoChild || mGeckoChild->Destroyed()) {
+    return NO;
+  }
+  if (mGeckoChild->GetInputContext().IsPasswordEditor()) {
+    return YES;
+  }
+  return NO;
+}
+
+#ifdef ACCESSIBILITY
+// MUIRootAccessible
+
+- (id<MUIRootAccessibleProtocol>)accessible {
+  if (!mGeckoChild) return nil;
+
+  id<MUIRootAccessibleProtocol> nativeAccessible = nil;
+
+  // nsAutoRetainCocoaObject kungFuDeathGrip(self);
+  RefPtr<nsWindow> geckoChild(mGeckoChild);
+  RefPtr<a11y::LocalAccessible> accessible = geckoChild->GetRootAccessible();
+  if (!accessible) return nil;
+
+  accessible->GetNativeInterface((void**)&nativeAccessible);
+
+  return nativeAccessible;
+}
+
+- (BOOL)hasRepresentedView {
+  return YES;
+}
+
+- (id)representedView {
+  return self;
+}
+
+- (BOOL)isAccessibilityElement {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super isAccessibilityElement];
+  }
+
+  return [[self accessible] isAccessibilityElement];
+}
+
+- (NSString*)accessibilityLabel {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityLabel];
+  }
+
+  return [[self accessible] accessibilityLabel];
+}
+
+- (CGRect)accessibilityFrame {
+  // Use the UIView implementation here. We rely on the position of this
+  // frame to place gecko bounds in the right offset.
+  return [super accessibilityFrame];
+}
+
+- (NSString*)accessibilityValue {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityValue];
+  }
+
+  return [[self accessible] accessibilityValue];
+}
+
+- (uint64_t)accessibilityTraits {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityTraits];
+  }
+
+  return [[self accessible] accessibilityTraits];
+}
+
+- (NSInteger)accessibilityElementCount {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityElementCount];
+  }
+
+  return [[self accessible] accessibilityElementCount];
+}
+
+- (nullable id)accessibilityElementAtIndex:(NSInteger)index {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityElementAtIndex:index];
+  }
+
+  return [[self accessible] accessibilityElementAtIndex:index];
+}
+
+- (NSInteger)indexOfAccessibilityElement:(id)element {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super indexOfAccessibilityElement:element];
+  }
+
+  return [[self accessible] indexOfAccessibilityElement:element];
+}
+
+- (NSArray* _Nullable)accessibilityElements {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityElements];
+  }
+
+  return [[self accessible] accessibilityElements];
+}
+
+- (UIAccessibilityContainerType)accessibilityContainerType {
+  if (!mozilla::a11y::ShouldA11yBeEnabled()) {
+    return [super accessibilityContainerType];
+  }
+
+  return [[self accessible] accessibilityContainerType];
+}
+#endif
+
 @end
 
 nsWindow::nsWindow()
@@ -442,20 +706,7 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
   if (parent == nullptr && nativeParent) parent = nativeParent->mGeckoChild;
   if (parent && nativeParent == nullptr) nativeParent = parent->mNativeView;
 
-  // for toplevel windows, bounds are fixed to full screen size
-  if (parent == nullptr) {
-    if (nsAppShell::gWindow == nil) {
-      mBounds = UIKitScreenManager::GetBounds();
-    } else {
-      CGRect cgRect = [nsAppShell::gWindow bounds];
-      mBounds.x = cgRect.origin.x;
-      mBounds.y = cgRect.origin.y;
-      mBounds.width = cgRect.size.width;
-      mBounds.height = cgRect.size.height;
-    }
-  } else {
-    mBounds = aRect;
-  }
+  mBounds = aRect;
 
   ALOG("nsWindow[%p]::Create bounds: %d %d %d %d", (void*)this, mBounds.x,
        mBounds.y, mBounds.width, mBounds.height);
@@ -487,6 +738,8 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
     [nsAppShell::gTopLevelViews addObject:mNativeView];
   }
 
+  mTextInputHandler = new widget::TextInputHandler(this);
+
   return NS_OK;
 }
 
@@ -498,6 +751,11 @@ void nsWindow::Destroy() {
 
   if (mParent) mParent->mChildren.RemoveElement(this);
 
+  if (mTextInputHandler) {
+    mTextInputHandler->OnDestroyed();
+  }
+  mTextInputHandler = nullptr;
+
   [mNativeView widgetDestroyed];
 
   nsBaseWidget::Destroy();
@@ -507,8 +765,6 @@ void nsWindow::Destroy() {
   TearDownView();
 
   nsBaseWidget::OnDestroy();
-
-  return NS_OK;
 }
 
 void nsWindow::Show(bool aState) {
@@ -595,16 +851,12 @@ void nsWindow::SetSizeMode(nsSizeMode aMode) {
 void nsWindow::Invalidate(const LayoutDeviceIntRect& aRect) {
   if (!mNativeView || !mVisible) return;
 
-  MOZ_RELEASE_ASSERT(
-      GetLayerManager()->GetBackendType() != LayersBackend::LAYERS_WR,
-      "Shouldn't need to invalidate with accelerated OMTC layers!");
-
   [mNativeView setNeedsLayout];
   [mNativeView setNeedsDisplayInRect:DevPixelsToUIKitPoints(
                                          mBounds, BackingScaleFactor())];
 }
 
-void nsWindow::SetFocus(Raise) {
+void nsWindow::SetFocus(Raise, mozilla::dom::CallerType) {
   [[mNativeView window] makeKeyWindow];
   [mNativeView becomeFirstResponder];
 }
@@ -649,10 +901,16 @@ void nsWindow::ReportSizeModeEvent(nsSizeMode aMode) {
 }
 
 void nsWindow::ReportSizeEvent() {
+  LayoutDeviceIntRect innerBounds = GetClientBounds();
+
   if (mWidgetListener) {
-    LayoutDeviceIntRect innerBounds = GetClientBounds();
     mWidgetListener->WindowResized(this, innerBounds.width, innerBounds.height);
   }
+
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->WindowResized(this, innerBounds.width,
+                                           innerBounds.height);
+  }
 }
 
 LayoutDeviceIntRect nsWindow::GetScreenBounds() {
@@ -672,8 +930,8 @@ LayoutDeviceIntPoint nsWindow::WidgetToScreenOffset() {
     temp = [nsAppShell::gWindow convertPoint:temp toWindow:nil];
   }
 
-  offset.x += temp.x;
-  offset.y += temp.y;
+  offset.x += static_cast<int32_t>(temp.x);
+  offset.y += static_cast<int32_t>(temp.y);
 
   return offset;
 }
@@ -682,23 +940,63 @@ nsresult nsWindow::DispatchEvent(mozilla::WidgetGUIEvent* aEvent,
                                  nsEventStatus& aStatus) {
   aStatus = nsEventStatus_eIgnore;
   nsCOMPtr<nsIWidget> kungFuDeathGrip(aEvent->mWidget);
+  mozilla::Unused << kungFuDeathGrip;  // Not used within this function
 
-  if (mWidgetListener)
+  if (mAttachedWidgetListener) {
+    aStatus = mAttachedWidgetListener->HandleEvent(aEvent, mUseAttachedEvents);
+  } else if (mWidgetListener) {
     aStatus = mWidgetListener->HandleEvent(aEvent, mUseAttachedEvents);
+  }
 
   return NS_OK;
 }
 
 void nsWindow::SetInputContext(const InputContext& aContext,
                                const InputContextAction& aAction) {
-  // TODO: actually show VKB
+  NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+  const bool changingEnabledState =
+      aContext.IsInputAttributeChanged(mInputContext);
+
   mInputContext = aContext;
+
+  if (IsVirtualKeyboardDisabled()) {
+    [mNativeView resignFirstResponder];
+    return;
+  }
+
+  [mNativeView becomeFirstResponder];
+
+  if (aAction.UserMightRequestOpenVKB() || changingEnabledState) {
+    // TODO(m_kato):
+    // It is unnecessary to call reloadInputViews with changingEnabledState if
+    // virtual keyboard is disappeared.
+    [mNativeView reloadInputViews];
+  }
+
+  NS_OBJC_END_TRY_IGNORE_BLOCK;
 }
 
-mozilla::widget::InputContext nsWindow::GetInputContext() {
+widget::InputContext nsWindow::GetInputContext() {
+  if (!mTextInputHandler) {
+    InputContext context;
+    context.mIMEState.mEnabled = IMEEnabled::Disabled;
+    context.mIMEState.mOpen = IMEState::OPEN_STATE_NOT_SUPPORTED;
+    return context;
+  }
   return mInputContext;
 }
 
+widget::TextEventDispatcherListener*
+nsWindow::GetNativeTextEventDispatcherListener() {
+  return mTextInputHandler;
+}
+
+bool nsWindow::IsVirtualKeyboardDisabled() const {
+  return mInputContext.mIMEState.mEnabled == IMEEnabled::Disabled ||
+         mInputContext.mHTMLInputMode.EqualsLiteral("none");
+}
+
 void nsWindow::SetBackgroundColor(const nscolor& aColor) {
   mNativeView.backgroundColor = [UIColor colorWithRed:NS_GET_R(aColor)
                                                 green:NS_GET_G(aColor)
diff --git a/widget/windows/GfxInfo.cpp b/widget/windows/GfxInfo.cpp
index 6f033785f5..0e1b4002d3 100644
--- a/widget/windows/GfxInfo.cpp
+++ b/widget/windows/GfxInfo.cpp
@@ -1092,25 +1092,20 @@ void GfxInfo::AddCrashReportAnnotations() {
   }
 
   nsString deviceID, vendorID, driverVersion, subsysID;
-  nsCString narrowDeviceID, narrowVendorID, narrowDriverVersion, narrowSubsysID;
 
   GetAdapterDeviceID(deviceID);
-  CopyUTF16toUTF8(deviceID, narrowDeviceID);
   GetAdapterVendorID(vendorID);
-  CopyUTF16toUTF8(vendorID, narrowVendorID);
   GetAdapterDriverVersion(driverVersion);
-  CopyUTF16toUTF8(driverVersion, narrowDriverVersion);
   GetAdapterSubsysID(subsysID);
-  CopyUTF16toUTF8(subsysID, narrowSubsysID);
 
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterVendorID,
-                                     narrowVendorID);
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterDeviceID,
-                                     narrowDeviceID);
-  CrashReporter::AnnotateCrashReport(
-      CrashReporter::Annotation::AdapterDriverVersion, narrowDriverVersion);
-  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AdapterSubsysID,
-                                     narrowSubsysID);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterVendorID, vendorID);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterDeviceID, deviceID);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterDriverVersion, driverVersion);
+  CrashReporter::RecordAnnotationNSString(
+      CrashReporter::Annotation::AdapterSubsysID, subsysID);
 
   /* Add an App Note, this contains extra information. */
   nsAutoCString note;
@@ -1741,24 +1736,6 @@ const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
         "FEATURE_UNQUALIFIED_P010_NVIDIA");
 
     ////////////////////////////////////
-    // FEATURE_VIDEO_OVERLAY - ALLOWLIST
-#ifdef EARLY_BETA_OR_EARLIER
-    APPEND_TO_DRIVER_BLOCKLIST2(
-        OperatingSystem::Windows, DeviceFamily::All,
-        nsIGfxInfo::FEATURE_VIDEO_OVERLAY, nsIGfxInfo::FEATURE_ALLOW_ALWAYS,
-        DRIVER_COMPARISON_IGNORED, V(0, 0, 0, 0), "FEATURE_ROLLOUT_ALL");
-#else
-    APPEND_TO_DRIVER_BLOCKLIST2(
-        OperatingSystem::Windows, DeviceFamily::IntelAll,
-        nsIGfxInfo::FEATURE_VIDEO_OVERLAY, nsIGfxInfo::FEATURE_ALLOW_ALWAYS,
-        DRIVER_COMPARISON_IGNORED, V(0, 0, 0, 0), "FEATURE_ROLLOUT_INTEL");
-    APPEND_TO_DRIVER_BLOCKLIST2(
-        OperatingSystem::Windows, DeviceFamily::NvidiaAll,
-        nsIGfxInfo::FEATURE_VIDEO_OVERLAY, nsIGfxInfo::FEATURE_ALLOW_ALWAYS,
-        DRIVER_COMPARISON_IGNORED, V(0, 0, 0, 0), "FEATURE_ROLLOUT_NVIDIA");
-#endif
-
-    ////////////////////////////////////
     // FEATURE_HW_DECODED_VIDEO_ZERO_COPY
 
     APPEND_TO_DRIVER_BLOCKLIST_RANGE(
@@ -1801,9 +1778,13 @@ const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
 
     ////////////////////////////////////
     // FEATURE_HW_DECODED_VIDEO_ZERO_COPY - ALLOWLIST
-
-    // XXX ZeroCopyNV12Texture is disabled with non-intel GPUs for now.
-    // See Bug 1798242
+#ifdef EARLY_BETA_OR_EARLIER
+    APPEND_TO_DRIVER_BLOCKLIST2(
+        OperatingSystem::Windows, DeviceFamily::NvidiaAll,
+        nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY,
+        nsIGfxInfo::FEATURE_ALLOW_ALWAYS, DRIVER_COMPARISON_IGNORED,
+        V(0, 0, 0, 0), "FEATURE_ROLLOUT_ALL");
+#endif
     APPEND_TO_DRIVER_BLOCKLIST2(
         OperatingSystem::Windows, DeviceFamily::IntelAll,
         nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY,
@@ -1828,6 +1809,26 @@ const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
         "Intel driver 10.18.15.*");
 
     ////////////////////////////////////
+    // FEATURE_OVERLAY_VP_AUTO_HDR
+
+    APPEND_TO_DRIVER_BLOCKLIST(
+        OperatingSystem::Windows, DeviceFamily::NvidiaAll,
+        nsIGfxInfo::FEATURE_OVERLAY_VP_AUTO_HDR,
+        nsIGfxInfo::FEATURE_BLOCKED_DRIVER_VERSION, DRIVER_LESS_THAN_OR_EQUAL,
+        V(31, 0, 15, 5050), "FEATURE_FAILURE_VP_AUTO_HDR",
+        "nVidia driver > 550.50");
+
+    ////////////////////////////////////
+    // FEATURE_OVERLAY_VP_SUPER_RESOLUTION
+
+    APPEND_TO_DRIVER_BLOCKLIST(
+        OperatingSystem::Windows, DeviceFamily::NvidiaAll,
+        nsIGfxInfo::FEATURE_OVERLAY_VP_SUPER_RESOLUTION,
+        nsIGfxInfo::FEATURE_BLOCKED_DRIVER_VERSION, DRIVER_LESS_THAN_OR_EQUAL,
+        V(31, 0, 15, 3000), "FEATURE_FAILURE_VP_AUTO_HDR",
+        "nVidia driver > 530.00");
+
+    ////////////////////////////////////
     // FEATURE_WEBRENDER
     // Block 8.56.1.15/16
     APPEND_TO_DRIVER_BLOCKLIST2(OperatingSystem::Windows, DeviceFamily::AtiAll,
diff --git a/widget/windows/JumpListBuilder.cpp b/widget/windows/JumpListBuilder.cpp
index 80b1c29aa7..e25c8c038f 100644
--- a/widget/windows/JumpListBuilder.cpp
+++ b/widget/windows/JumpListBuilder.cpp
@@ -176,8 +176,9 @@ JumpListBuilder::JumpListBuilder(const nsAString& aAppUserModelId,
   // the app, as it is set in the package manifest instead.
   if (!mozilla::widget::WinUtils::HasPackageIdentity()) {
     mIOThread->Dispatch(
-        NewRunnableMethod<nsString>(
-            "SetAppID", this, &JumpListBuilder::DoSetAppID, aAppUserModelId),
+        NewRunnableMethod<nsString>("SetAppID", this,
+                                    &JumpListBuilder::DoSetAppIDIfAvailable,
+                                    aAppUserModelId),
         NS_DISPATCH_NORMAL);
   }
 }
@@ -203,10 +204,13 @@ void JumpListBuilder::DoShutdownBackend() {
   mJumpListBackend = nullptr;
 }
 
-void JumpListBuilder::DoSetAppID(nsString aAppUserModelID) {
+void JumpListBuilder::DoSetAppIDIfAvailable(nsString aAppUserModelID) {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_ASSERT(mJumpListBackend);
-  mJumpListBackend->SetAppID(aAppUserModelID.get());
+
+  if (mJumpListBackend->IsAvailable()) {
+    mJumpListBackend->SetAppID(aAppUserModelID.get());
+  }
 }
 
 NS_IMETHODIMP
diff --git a/widget/windows/JumpListBuilder.h b/widget/windows/JumpListBuilder.h
index e228669f11..b8d5253153 100644
--- a/widget/windows/JumpListBuilder.h
+++ b/widget/windows/JumpListBuilder.h
@@ -64,7 +64,7 @@ class JumpListBuilder : public nsIJumpListBuilder, public nsIObserver {
   void DoSetupBackend();
   void DoSetupTestingBackend(RefPtr<JumpListBackend> aTestingBackend);
   void DoShutdownBackend();
-  void DoSetAppID(nsString aAppUserModelID);
+  void DoSetAppIDIfAvailable(nsString aAppUserModelID);
   void DoIsAvailable(const nsMainThreadPtrHandle<dom::Promise>& aPromiseHolder);
   void DoCheckForRemovals(
       const nsMainThreadPtrHandle<dom::Promise>& aPromiseHolder);
diff --git a/widget/windows/WinTaskbar.cpp b/widget/windows/WinTaskbar.cpp
index 56608503da..66854f3ee2 100644
--- a/widget/windows/WinTaskbar.cpp
+++ b/widget/windows/WinTaskbar.cpp
@@ -223,6 +223,11 @@ bool WinTaskbar::GenerateAppUserModelID(nsAString& aAppUserModelId,
         id.AppendInt(HashString(path));
         if (!id.IsEmpty()) {
           aAppUserModelId.Assign(id);
+
+          if (aPrivateBrowsing) {
+            aAppUserModelId.AppendLiteral(";PrivateBrowsingAUMID");
+          }
+
           return true;
         }
       }
diff --git a/widget/windows/WindowsSMTCProvider.cpp b/widget/windows/WindowsSMTCProvider.cpp
index 04d833a8e7..69915cafd8 100644
--- a/widget/windows/WindowsSMTCProvider.cpp
+++ b/widget/windows/WindowsSMTCProvider.cpp
@@ -255,6 +255,25 @@ void WindowsSMTCProvider::UnregisterEvents() {
   if (mControls && mButtonPressedToken.value != 0) {
     mControls->remove_ButtonPressed(mButtonPressedToken);
   }
+
+  if (mControls && mSeekRegistrationToken.value != 0) {
+    ComPtr<ISystemMediaTransportControls2> smtc2;
+    HRESULT hr = mControls.As(&smtc2);
+    if (FAILED(hr)) {
+      LOG("Failed to cast controls to ISystemMediaTransportControls2 (hr=%lx)",
+          hr);
+      return;
+    }
+    MOZ_ASSERT(smtc2);
+
+    hr = smtc2->remove_PlaybackPositionChangeRequested(mSeekRegistrationToken);
+    if (FAILED(hr)) {
+      LOG("SystemMediaTransportControls: Failed unregister position change "
+          "event (hr=%lx)",
+          hr);
+      return;
+    }
+  }
 }
 
 bool WindowsSMTCProvider::RegisterEvents() {
@@ -289,6 +308,48 @@ bool WindowsSMTCProvider::RegisterEvents() {
     return false;
   }
 
+  ComPtr<ISystemMediaTransportControls2> smtc2;
+  HRESULT hr = mControls.As(&smtc2);
+  if (FAILED(hr)) {
+    LOG("Failed to cast controls to ISystemMediaTransportControls2 (hr=%lx)",
+        hr);
+    return false;
+  }
+  MOZ_ASSERT(smtc2);
+
+  auto positionChangeRequested =
+      Callback<ITypedEventHandler<SystemMediaTransportControls*,
+                                  PlaybackPositionChangeRequestedEventArgs*>>(
+          [this, self](
+              ISystemMediaTransportControls*,
+              IPlaybackPositionChangeRequestedEventArgs* pArgs) -> HRESULT {
+            MOZ_ASSERT(pArgs);
+
+            TimeSpan value;
+            HRESULT hr = pArgs->get_RequestedPlaybackPosition(&value);
+            if (FAILED(hr)) {
+              LOG("SystemMediaTransportControls: Playback Position Change - "
+                  "failed to get requested position (hr=%lx)",
+                  hr);
+              return S_OK;  // Propagating the error probably wouldn't help.
+            }
+
+            double position =
+                static_cast<double>(value.Duration) / (1e6 * 10.0);
+            this->OnPositionChangeRequested(position);
+
+            return S_OK;
+          });
+
+  hr = smtc2->add_PlaybackPositionChangeRequested(positionChangeRequested.Get(),
+                                                  &mSeekRegistrationToken);
+  if (FAILED(hr)) {
+    LOG("SystemMediaTransportControls: Failed to register position change "
+        "event (hr=%lx)",
+        hr);
+    return false;
+  }
+
   return true;
 }
 
@@ -309,12 +370,14 @@ bool WindowsSMTCProvider::EnableControl(bool aEnabled) const {
   return SUCCEEDED(mControls->put_IsEnabled(aEnabled));
 }
 
-bool WindowsSMTCProvider::UpdateButtons() const {
+bool WindowsSMTCProvider::UpdateButtons() {
   static const mozilla::dom::MediaControlKey kKeys[] = {
-      mozilla::dom::MediaControlKey::Play, mozilla::dom::MediaControlKey::Pause,
+      mozilla::dom::MediaControlKey::Play,
+      mozilla::dom::MediaControlKey::Pause,
       mozilla::dom::MediaControlKey::Previoustrack,
       mozilla::dom::MediaControlKey::Nexttrack,
-      mozilla::dom::MediaControlKey::Stop};
+      mozilla::dom::MediaControlKey::Stop,
+      mozilla::dom::MediaControlKey::Seekto};
 
   bool success = true;
   for (const mozilla::dom::MediaControlKey& key : kKeys) {
@@ -347,12 +410,28 @@ bool WindowsSMTCProvider::EnableKey(mozilla::dom::MediaControlKey aKey,
       return SUCCEEDED(mControls->put_IsNextEnabled(aEnable));
     case mozilla::dom::MediaControlKey::Stop:
       return SUCCEEDED(mControls->put_IsStopEnabled(aEnable));
+    case mozilla::dom::MediaControlKey::Seekto:
+      // The callback for the event checks if the key is supported
+      return mSeekRegistrationToken.value != 0;
     default:
       LOG("No button for %s", ToMediaControlKeyStr(aKey));
       return false;
   }
 }
 
+void WindowsSMTCProvider::OnPositionChangeRequested(double aPosition) const {
+  if (!IsKeySupported(mozilla::dom::MediaControlKey::Seekto)) {
+    LOG("Seekto is not supported");
+    return;
+  }
+
+  for (const auto& listener : mListeners) {
+    listener->OnActionPerformed(
+        mozilla::dom::MediaControlAction(mozilla::dom::MediaControlKey::Seekto,
+                                         mozilla::dom::SeekDetails(aPosition)));
+  }
+}
+
 bool WindowsSMTCProvider::InitDisplayAndControls() {
   // As Open() might be called multiple times, "cache" the results of the COM
   // API
@@ -422,6 +501,100 @@ bool WindowsSMTCProvider::SetMusicMetadata(const nsString& aArtist,
   return true;
 }
 
+void WindowsSMTCProvider::SetPositionState(
+    const mozilla::Maybe<mozilla::dom::PositionState>& aState) {
+  ComPtr<ISystemMediaTransportControls2> smtc2;
+  HRESULT hr = mControls.As(&smtc2);
+  if (FAILED(hr)) {
+    LOG("Failed to cast controls to ISystemMediaTransportControls2 (hr=%lx)",
+        hr);
+    return;
+  }
+  MOZ_ASSERT(smtc2);
+
+  ComPtr<ISystemMediaTransportControlsTimelineProperties> properties;
+  hr = RoActivateInstance(
+      HStringReference(
+          RuntimeClass_Windows_Media_SystemMediaTransportControlsTimelineProperties)
+          .Get(),
+      &properties);
+  if (FAILED(hr)) {
+    LOG("Failed to create timeline properties (hr=%lx)", hr);
+    return;
+  }
+  MOZ_ASSERT(properties);
+
+  // Converts a value in seconds to a TimeSpan
+  // The TimeSpan's Duration is a value in 100ns ticks
+  // https://learn.microsoft.com/en-us/windows/win32/api/windows.foundation/ns-windows-foundation-timespan#members
+  auto toTimeSpan = [this](double seconds) {
+    constexpr double kMaxMicroseconds =
+        static_cast<double>(std::numeric_limits<LONG64>::max() / 10);
+
+    double microseconds = seconds * 1e6;
+
+    if (microseconds > kMaxMicroseconds) {
+      LOG("Failed to convert %f microseconds to TimeSpan (overflow)",
+          microseconds);
+      return TimeSpan{0};
+    }
+
+    return TimeSpan{static_cast<LONG64>(microseconds * 10.0)};
+  };
+
+  TimeSpan endTime{0};
+  TimeSpan position{0};
+  double playbackRate = 1.0;
+
+  if (aState) {
+    endTime = toTimeSpan(aState->mDuration);
+    position = toTimeSpan(aState->CurrentPlaybackPosition());
+    playbackRate = aState->mPlaybackRate;
+  }
+
+  hr = properties->put_StartTime({0});
+  if (FAILED(hr)) {
+    LOG("Failed to set the start time (hr=%lx)", hr);
+    return;
+  }
+
+  hr = properties->put_MinSeekTime({0});
+  if (FAILED(hr)) {
+    LOG("Failed to set the min seek time (hr=%lx)", hr);
+    return;
+  }
+
+  hr = properties->put_EndTime(endTime);
+  if (FAILED(hr)) {
+    LOG("Failed to set the end time (hr=%lx)", hr);
+    return;
+  }
+
+  hr = properties->put_MaxSeekTime(endTime);
+  if (FAILED(hr)) {
+    LOG("Failed to set the max seek time (hr=%lx)", hr);
+    return;
+  }
+
+  hr = properties->put_Position(position);
+  if (FAILED(hr)) {
+    LOG("Failed to set the playback position (hr=%lx)", hr);
+    return;
+  }
+
+  hr = smtc2->UpdateTimelineProperties(properties.Get());
+  if (FAILED(hr)) {
+    LOG("Failed to update timeline properties (hr=%lx)", hr);
+    return;
+  }
+
+  hr = smtc2->put_PlaybackRate(playbackRate);
+  if (FAILED(hr)) {
+    LOG("Failed to set the playback rate (hr=%lx)", hr);
+    return;
+  }
+}
+
 void WindowsSMTCProvider::LoadThumbnail(
     const nsTArray<mozilla::dom::MediaImage>& aArtwork) {
   MOZ_ASSERT(NS_IsMainThread());
diff --git a/widget/windows/WindowsSMTCProvider.h b/widget/windows/WindowsSMTCProvider.h
index 3926618d1f..2f0d1f8344 100644
--- a/widget/windows/WindowsSMTCProvider.h
+++ b/widget/windows/WindowsSMTCProvider.h
@@ -46,6 +46,9 @@ class WindowsSMTCProvider final : public mozilla::dom::MediaControlKeySource {
 
   void SetSupportedMediaKeys(const MediaKeysArray& aSupportedKeys) override;
 
+  void SetPositionState(
+      const mozilla::Maybe<mozilla::dom::PositionState>& aState) override;
+
  private:
   ~WindowsSMTCProvider();
   void UnregisterEvents();
@@ -54,12 +57,14 @@ class WindowsSMTCProvider final : public mozilla::dom::MediaControlKeySource {
   void OnButtonPressed(mozilla::dom::MediaControlKey aKey) const;
   // Enable the SMTC interface
   bool EnableControl(bool aEnabled) const;
-  // Sets the play, pause, next, previous buttons on the SMTC interface by
-  // mSupportedKeys
-  bool UpdateButtons() const;
+  // Sets the play, pause, next, previous, seekto buttons on the SMTC interface
+  // by mSupportedKeys
+  bool UpdateButtons();
   bool IsKeySupported(mozilla::dom::MediaControlKey aKey) const;
   bool EnableKey(mozilla::dom::MediaControlKey aKey, bool aEnable) const;
 
+  void OnPositionChangeRequested(double aPosition) const;
+
   bool InitDisplayAndControls();
 
   // Sets the Metadata for the currently playing media and sets the playback
@@ -122,6 +127,7 @@ class WindowsSMTCProvider final : public mozilla::dom::MediaControlKeySource {
   // EventRegistrationTokens are used to have a handle on a callback (to remove
   // it again)
   EventRegistrationToken mButtonPressedToken;
+  EventRegistrationToken mSeekRegistrationToken;
 };
 
 #endif  // __MINGW32__
diff --git a/widget/windows/filedialog/WinFileDialogChild.cpp b/widget/windows/filedialog/WinFileDialogChild.cpp
index 1a2903f8ec..a41018ff0e 100644
--- a/widget/windows/filedialog/WinFileDialogChild.cpp
+++ b/widget/windows/filedialog/WinFileDialogChild.cpp
@@ -40,11 +40,8 @@ WinFileDialogChild::~WinFileDialogChild() {
 template <size_t N>
 WinFileDialogChild::IPCResult WinFileDialogChild::MakeIpcFailure(
     HRESULT hr, const char (&what)[N]) {
-  // The crash-report annotator stringifies integer values anyway. We do so
-  // eagerly here to avoid questions about C int/long conversion semantics.
-  nsPrintfCString data("%lu", hr);
-  CrashReporter::AnnotateCrashReport(
-      CrashReporter::Annotation::WindowsFileDialogErrorCode, data);
+  CrashReporter::RecordAnnotationU32(
+      CrashReporter::Annotation::WindowsFileDialogErrorCode, hr);
 
   return IPC_FAIL(this, what);
 }
diff --git a/widget/windows/filedialog/WinFileDialogCommands.cpp b/widget/windows/filedialog/WinFileDialogCommands.cpp
index f0503ab8f0..838856893d 100644
--- a/widget/windows/filedialog/WinFileDialogCommands.cpp
+++ b/widget/windows/filedialog/WinFileDialogCommands.cpp
@@ -294,7 +294,7 @@ void LogProcessingError(LogModule* aModule, ipc::IProtocol* aCaller,
           ipc::SandboxingKind::WINDOWS_FILE_DIALOG);
     } else {
       // ... which (presumably) is us
-      CrashReporter::AnnotateCrashReport(
+      CrashReporter::AutoRecordAnnotation(
           CrashReporter::Annotation::ipc_channel_error, reason);
 
       MOZ_CRASH("IPC error");
diff --git a/widget/windows/nsFilePicker.cpp b/widget/windows/nsFilePicker.cpp
index 310c54bb40..fb4c6e80b5 100644
--- a/widget/windows/nsFilePicker.cpp
+++ b/widget/windows/nsFilePicker.cpp
@@ -19,6 +19,7 @@
 #include "mozilla/BackgroundHangMonitor.h"
 #include "mozilla/Components.h"
 #include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
 #include "mozilla/dom/Directory.h"
 #include "mozilla/Logging.h"
 #include "mozilla/ipc/UtilityProcessManager.h"
@@ -94,19 +95,14 @@ nsFilePicker::nsFilePicker() : mSelectedType(1) {}
 NS_IMPL_ISUPPORTS(nsFilePicker, nsIFilePicker)
 
 NS_IMETHODIMP nsFilePicker::Init(
-    mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-    nsIFilePicker::Mode aMode,
-    mozilla::dom::BrowsingContext* aBrowsingContext) {
+    mozilla::dom::BrowsingContext* aBrowsingContext, const nsAString& aTitle,
+    nsIFilePicker::Mode aMode) {
   // Don't attempt to open a real file-picker in headless mode.
   if (gfxPlatform::IsHeadless()) {
     return nsresult::NS_ERROR_NOT_AVAILABLE;
   }
 
-  nsCOMPtr<nsPIDOMWindowOuter> window = do_QueryInterface(aParent);
-  nsIDocShell* docShell = window ? window->GetDocShell() : nullptr;
-  mLoadContext = do_QueryInterface(docShell);
-
-  return nsBaseFilePicker::Init(aParent, aTitle, aMode, aBrowsingContext);
+  return nsBaseFilePicker::Init(aBrowsingContext, aTitle, aMode);
 }
 
 namespace mozilla::detail {
@@ -1053,7 +1049,7 @@ void nsFilePicker::RememberLastUsedDirectory() {
 }
 
 bool nsFilePicker::IsPrivacyModeEnabled() {
-  return mLoadContext && mLoadContext->UsePrivateBrowsing();
+  return mBrowsingContext && mBrowsingContext->UsePrivateBrowsing();
 }
 
 bool nsFilePicker::IsDefaultPathLink() {
diff --git a/widget/windows/nsFilePicker.h b/widget/windows/nsFilePicker.h
index 1938b8bcb6..59108bc0dd 100644
--- a/widget/windows/nsFilePicker.h
+++ b/widget/windows/nsFilePicker.h
@@ -66,9 +66,8 @@ class nsFilePicker final : public nsBaseWinFilePicker {
  public:
   nsFilePicker();
 
-  NS_IMETHOD Init(mozIDOMWindowProxy* aParent, const nsAString& aTitle,
-                  nsIFilePicker::Mode aMode,
-                  mozilla::dom::BrowsingContext* aBrowsingContext) override;
+  NS_IMETHOD Init(mozilla::dom::BrowsingContext* aBrowsingContext,
+                  const nsAString& aTitle, nsIFilePicker::Mode aMode) override;
 
   NS_DECL_ISUPPORTS
 
@@ -117,7 +116,6 @@ class nsFilePicker final : public nsBaseWinFilePicker {
   bool IsDefaultPathLink();
   bool IsDefaultPathHtml();
 
-  nsCOMPtr<nsILoadContext> mLoadContext;
   nsCOMPtr<nsIWidget> mParentWidget;
   nsString mTitle;
   nsCString mFile;
diff --git a/widget/windows/nsLookAndFeel.cpp b/widget/windows/nsLookAndFeel.cpp
index 01b126cd42..6122000c9e 100644
--- a/widget/windows/nsLookAndFeel.cpp
+++ b/widget/windows/nsLookAndFeel.cpp
@@ -409,9 +409,6 @@ nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
       // (400ms) on error.
       aResult = GetSystemParam(SPI_GETMENUSHOWDELAY, 400);
       break;
-    case IntID::TooltipDelay:
-      aResult = 500;
-      break;
     case IntID::MenusCanOverlapOSBar:
       // we want XUL popups to be able to overlap the task bar.
       aResult = 1;
diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index 1a8646d620..b304d2efac 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -175,12 +175,11 @@
 #include <zmouse.h>
 #include <richedit.h>
 
-#if defined(ACCESSIBILITY)
-
+#ifdef ACCESSIBILITY
 #  ifdef DEBUG
 #    include "mozilla/a11y/Logging.h"
 #  endif
-
+#  include "mozilla/a11y/Compatibility.h"
 #  include "oleidl.h"
 #  include <winuser.h>
 #  include "nsAccessibilityService.h"
@@ -190,7 +189,7 @@
 #  if !defined(WINABLEAPI)
 #    include <winable.h>
 #  endif  // !defined(WINABLEAPI)
-#endif    // defined(ACCESSIBILITY)
+#endif
 
 #include "WindowsUIUtils.h"
 
@@ -1221,18 +1220,19 @@ static LPWSTR const gStockApplicationIcon = MAKEINTRESOURCEW(32512);
 
 /* static */
 const wchar_t* nsWindow::ChooseWindowClass(WindowType aWindowType) {
-  switch (aWindowType) {
-    case WindowType::Invisible:
-      return RegisterWindowClass(kClassNameHidden, 0, gStockApplicationIcon);
-    case WindowType::Dialog:
-      return RegisterWindowClass(kClassNameDialog, 0, nullptr);
-    case WindowType::Popup:
-      return RegisterWindowClass(kClassNameDropShadow, 0,
-                                 gStockApplicationIcon);
-    default:
-      return RegisterWindowClass(GetMainWindowClass(), 0,
-                                 gStockApplicationIcon);
-  }
+  const wchar_t* className = [aWindowType] {
+    switch (aWindowType) {
+      case WindowType::Invisible:
+        return kClassNameHidden;
+      case WindowType::Dialog:
+        return kClassNameDialog;
+      case WindowType::Popup:
+        return kClassNameDropShadow;
+      default:
+        return GetMainWindowClass();
+    }
+  }();
+  return RegisterWindowClass(className, 0, gStockApplicationIcon);
 }
 
 /**************************************************************
@@ -1310,13 +1310,6 @@ DWORD nsWindow::WindowStyle() {
     if (mBorderStyle == BorderStyle::None ||
         !(mBorderStyle & BorderStyle::Maximize))
       style &= ~WS_MAXIMIZEBOX;
-
-    if (IsPopupWithTitleBar()) {
-      style |= WS_CAPTION;
-      if (mBorderStyle & BorderStyle::Close) {
-        style |= WS_SYSMENU;
-      }
-    }
   }
 
   if (mIsChildWindow) {
@@ -1332,7 +1325,6 @@ DWORD nsWindow::WindowStyle() {
 
 // Return nsWindow extended styles
 DWORD nsWindow::WindowExStyle() {
-  MOZ_ASSERT_IF(mIsAlert, mWindowType == WindowType::Dialog);
   switch (mWindowType) {
     case WindowType::Child:
       return 0;
@@ -1343,18 +1335,18 @@ DWORD nsWindow::WindowExStyle() {
       }
       return extendedStyle;
     }
-    case WindowType::Dialog: {
-      if (mIsAlert) {
-        return WS_EX_TOOLWINDOW | WS_EX_TOPMOST;
-      }
-      return WS_EX_WINDOWEDGE | WS_EX_DLGMODALFRAME;
-    }
     case WindowType::Sheet:
       MOZ_FALLTHROUGH_ASSERT("Sheets are macOS specific");
+    case WindowType::Dialog:
     case WindowType::TopLevel:
     case WindowType::Invisible:
       break;
   }
+  if (mIsAlert) {
+    MOZ_ASSERT(mWindowType == WindowType::Dialog,
+               "Expect alert windows to have type=dialog");
+    return WS_EX_TOOLWINDOW | WS_EX_TOPMOST;
+  }
   return WS_EX_WINDOWEDGE;
 }
 
@@ -3058,9 +3050,7 @@ void nsWindow::SetTransparencyMode(TransparencyMode aMode) {
 
 void nsWindow::UpdateWindowDraggingRegion(
     const LayoutDeviceIntRegion& aRegion) {
-  if (mDraggableRegion != aRegion) {
-    mDraggableRegion = aRegion;
-  }
+  mDraggableRegion = aRegion;
 }
 
 /**************************************************************
@@ -3674,7 +3664,7 @@ LayoutDeviceIntPoint nsWindow::WidgetToScreenOffset() {
 }
 
 LayoutDeviceIntMargin nsWindow::ClientToWindowMargin() {
-  if (mWindowType == WindowType::Popup && !IsPopupWithTitleBar()) {
+  if (mWindowType == WindowType::Popup) {
     return {};
   }
 
@@ -4420,6 +4410,17 @@ HWND nsWindow::GetTopLevelForFocus(HWND aCurWnd) {
 }
 
 void nsWindow::DispatchFocusToTopLevelWindow(bool aIsActivate) {
+  if (aIsActivate && mPickerDisplayCount) {
+    // We disable the root window when a picker opens. See PickerOpen. When the
+    // picker closes (but before PickerClosed is called), our window will get
+    // focus, but it will still be disabled. This confuses the focus system.
+    // Therefore, we ignore this focus and explicitly call this function once
+    // we re-enable the window. Rarely, the picker seems to re-enable our root
+    // window before we do, but for simplicity, we always ignore focus before
+    // the final call to PickerClosed. See bug 1883568 for further details.
+    return;
+  }
+
   if (aIsActivate) {
     sJustGotActivate = false;
   }
@@ -5039,6 +5040,44 @@ bool nsWindow::ProcessMessageInternal(UINT msg, WPARAM& wParam, LPARAM& lParam,
       break;
     }
 
+    case WM_GETTITLEBARINFOEX: {
+      if (!mCustomNonClient) {
+        break;
+      }
+      auto* info = reinterpret_cast<TITLEBARINFOEX*>(lParam);
+      const LayoutDeviceIntPoint origin = WidgetToScreenOffset();
+      auto GeckoClientToWinScreenRect =
+          [&origin](LayoutDeviceIntRect aRect) -> RECT {
+        aRect.MoveBy(origin);
+        return {
+            .left = aRect.x,
+            .top = aRect.y,
+            .right = aRect.XMost(),
+            .bottom = aRect.YMost(),
+        };
+      };
+      auto SetButton = [&](size_t aIndex, WindowButtonType aType) {
+        info->rgrect[aIndex] =
+            GeckoClientToWinScreenRect(mWindowBtnRect[aType]);
+        DWORD& state = info->rgstate[aIndex];
+        if (mWindowBtnRect[aType].IsEmpty()) {
+          state = STATE_SYSTEM_INVISIBLE;
+        } else {
+          state = STATE_SYSTEM_FOCUSABLE;
+        }
+      };
+      info->rgrect[0] = info->rcTitleBar =
+          GeckoClientToWinScreenRect(mDraggableRegion.GetBounds());
+      info->rgstate[0] = 0;
+      SetButton(2, WindowButtonType::Minimize);
+      SetButton(3, WindowButtonType::Maximize);
+      SetButton(5, WindowButtonType::Close);
+      // We don't have a help button.
+      info->rgstate[4] = STATE_SYSTEM_INVISIBLE;
+      info->rgrect[4] = {0, 0, 0, 0};
+      result = true;
+    } break;
+
     case WM_NCHITTEST: {
       if (mInputRegion.mFullyTransparent) {
         // Treat this window as transparent.
@@ -6169,6 +6208,9 @@ int32_t nsWindow::ClientMarginHitTestPoint(int32_t aX, int32_t aY) {
     if (mWindowBtnRect[WindowButtonType::Minimize].Contains(pt)) {
       testResult = HTMINBUTTON;
     } else if (mWindowBtnRect[WindowButtonType::Maximize].Contains(pt)) {
+#ifdef ACCESSIBILITY
+      a11y::Compatibility::SuppressA11yForSnapLayouts();
+#endif
       testResult = HTMAXBUTTON;
     } else if (mWindowBtnRect[WindowButtonType::Close].Contains(pt)) {
       testResult = HTCLOSE;
@@ -8168,8 +8210,23 @@ WPARAM nsWindow::wParamFromGlobalMouseState() {
   return result;
 }
 
+// WORKAROUND FOR UNDOCUMENTED BEHAVIOR: `IFileDialog::Show` disables the
+// top-level ancestor of its provided owner-window. If the modal window's
+// container process crashes, it will never get a chance to undo that.
+//
+// For simplicity's sake we simply unconditionally perform both the disabling
+// and reenabling here, synchronously, on the main thread, rather than leaving
+// it to happen in our asynchronously-operated IFileDialog.
+
 void nsWindow::PickerOpen() {
   AssertIsOnMainThread();
+
+  // Disable the root-level window synchronously before any file-dialogs get a
+  // chance to fight over doing it asynchronously.
+  if (!mPickerDisplayCount) {
+    ::EnableWindow(::GetAncestor(GetWindowHandle(), GA_ROOT), FALSE);
+  }
+
   mPickerDisplayCount++;
 }
 
@@ -8179,16 +8236,10 @@ void nsWindow::PickerClosed() {
   if (!mPickerDisplayCount) return;
   mPickerDisplayCount--;
 
-  // WORKAROUND FOR UNDOCUMENTED BEHAVIOR: `IFileDialog::Show` disables the
-  // top-level ancestor of its provided owner-window. If the modal window's
-  // container process crashes, it will never get a chance to undo that, so we
-  // do it manually here.
-  //
-  // Note that this may cause problems in the embedded case if you reparent a
-  // subtree of the native window hierarchy containing a Gecko window while that
-  // Gecko window has a file-dialog open.
+  // Once all the file-dialogs are gone, reenable the root-level window.
   if (!mPickerDisplayCount) {
     ::EnableWindow(::GetAncestor(GetWindowHandle(), GA_ROOT), TRUE);
+    DispatchFocusToTopLevelWindow(true);
   }
 
   if (!mPickerDisplayCount && mDestroyCalled) {
@@ -8528,6 +8579,7 @@ void nsWindow::ChangedDPI() {
       presShell->BackingScaleFactorChanged();
     }
   }
+  NotifyAPZOfDPIChange();
 }
 
 static Result<POINTER_FLAGS, nsresult> PointerStateToFlag(
diff --git a/widget/windows/nsWindow.h b/widget/windows/nsWindow.h
index c75c9d174d..3a521fb978 100644
--- a/widget/windows/nsWindow.h
+++ b/widget/windows/nsWindow.h
@@ -887,8 +887,8 @@ class nsWindow final : public nsBaseWidget {
   mozilla::UniquePtr<mozilla::widget::DirectManipulationOwner> mDmOwner;
 
   // Client rect for minimize, maximize and close buttons.
-  mozilla::EnumeratedArray<WindowButtonType, WindowButtonType::Count,
-                           LayoutDeviceIntRect>
+  mozilla::EnumeratedArray<WindowButtonType, LayoutDeviceIntRect,
+                           size_t(WindowButtonType::Count)>
       mWindowBtnRect;
 
   mozilla::DataMutex<Desktop> mDesktopId;
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-19 01:14:29 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-19 01:14:29 +0000
commit	fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 (patch)
tree	4c1ccaf5486d4f2009f9a338a98a83e886e29c97 /widget
parent	Releasing progress-linux version 124.0.1-1~progress7.99u1. (diff)
download	firefox-fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8.tar.xz firefox-fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8.zip