From 5ea7ac2cf36d91951e1f3f6b6a8fb248408d3328 Mon Sep 17 00:00:00 2001
From: "microsoft-playwright-automation[bot]"
 <203992400+microsoft-playwright-automation[bot]@users.noreply.github.com>
Date: Wed, 9 Sep 2026 14:54:56 +0100
Subject: [PATCH] feat(firefox): roll to r1544 (#42631)

Co-authored-by: microsoft-playwright-automation[bot] <203992400+microsoft-playwright-automation[bot]@users.noreply.github.com>
---
 browser_patches/firefox/UPSTREAM_CONFIG.sh    |   2 +-
 .../firefox/juggler/NetworkObserver.js        |  10 +-
 .../firefox/juggler/TargetRegistry.js         |   2 +-
 .../firefox/juggler/components/Juggler.js     |   2 +-
 .../firefox/juggler/content/Runtime.js        |  50 +-
 .../firefox/juggler/content/WorkerMain.js     |   4 +
 .../firefox/patches/bootstrap.diff            | 579 ++++++++++--------
 .../firefox/preferences/playwright.cfg        |   7 +-
 packages/playwright-core/browsers.json        |   2 +-
 9 files changed, 376 insertions(+), 282 deletions(-)

diff --git a/browser_patches/firefox/UPSTREAM_CONFIG.sh b/browser_patches/firefox/UPSTREAM_CONFIG.sh
index ab997865af..98c9002b25 100644
--- a/browser_patches/firefox/UPSTREAM_CONFIG.sh
+++ b/browser_patches/firefox/UPSTREAM_CONFIG.sh
@@ -1,3 +1,3 @@
 REMOTE_URL="https://github.com/mozilla-firefox/firefox"
 BASE_BRANCH="release"
-BASE_REVISION="f1b6c0f86b96b7e0688c26f65803576f27cdaf88"
+BASE_REVISION="d065a04bc5610f496762935dee56604a78b91b51"
diff --git a/browser_patches/firefox/juggler/NetworkObserver.js b/browser_patches/firefox/juggler/NetworkObserver.js
index 464bfdd8ee..2b4b3c5463 100644
--- a/browser_patches/firefox/juggler/NetworkObserver.js
+++ b/browser_patches/firefox/juggler/NetworkObserver.js
@@ -542,6 +542,9 @@ class NetworkRequest {
     try {
       remoteIPAddress = this.httpChannel.remoteAddress;
       remotePort = this.httpChannel.remotePort;
+      // Gecko reports bare IPv6 addresses, bracket them to match Chromium.
+      if (remoteIPAddress && remoteIPAddress.includes(':'))
+        remoteIPAddress = `[${remoteIPAddress}]`;
     } catch (e) {
       // remoteAddress is not defined for cached requests.
     }
@@ -906,7 +909,12 @@ class ResponseStorage {
     // Note: fulfilled request comes with decoded body right away.
     if ((request.httpChannel instanceof Ci.nsIEncodedChannel) && request.httpChannel.contentEncodings && !request.httpChannel.applyConversion && !request._fulfilled) {
       const encodingHeader = request.httpChannel.getResponseHeader("Content-Encoding");
-      encodings = encodingHeader.split(/\s*\t*,\s*\t*/);
+      // Firefox itself skips "identity" and empty encodings when applying content
+      // conversions, and there is no stream converter registered for them.
+      encodings = encodingHeader.split(/\s*\t*,\s*\t*/).filter(encoding => {
+        const normalized = encoding.trim().toLowerCase();
+        return normalized && normalized !== 'identity' && normalized !== 'x-identity';
+      });
     }
     this._responses.set(request.requestId, {
       body,
diff --git a/browser_patches/firefox/juggler/TargetRegistry.js b/browser_patches/firefox/juggler/TargetRegistry.js
index 0511315cf2..582f4e62f1 100644
--- a/browser_patches/firefox/juggler/TargetRegistry.js
+++ b/browser_patches/firefox/juggler/TargetRegistry.js
@@ -4,7 +4,7 @@
 
 const {Helper} = ChromeUtils.importESModule('chrome://juggler/content/Helper.js');
 const {Preferences} = ChromeUtils.importESModule("resource://gre/modules/Preferences.sys.mjs");
-const {ContextualIdentityService} = ChromeUtils.importESModule("resource://gre/modules/ContextualIdentityService.sys.mjs");
+const {ContextualIdentityService} = ChromeUtils.importESModule("moz-src:///toolkit/components/contextualidentity/ContextualIdentityService.sys.mjs");
 const {NetUtil} = ChromeUtils.importESModule('resource://gre/modules/NetUtil.sys.mjs');
 const {AppConstants} = ChromeUtils.importESModule("resource://gre/modules/AppConstants.sys.mjs");
 
diff --git a/browser_patches/firefox/juggler/components/Juggler.js b/browser_patches/firefox/juggler/components/Juggler.js
index 7595958619..ac9e6c26b7 100644
--- a/browser_patches/firefox/juggler/components/Juggler.js
+++ b/browser_patches/firefox/juggler/components/Juggler.js
@@ -40,6 +40,7 @@ ActorManagerParent.addJSWindowActors({
       },
     },
     allFrames: true,
+    safeForUntrustedWebProcess: true,
   },
 });
 
@@ -158,4 +159,3 @@ const jugglerInstance = new Juggler();
 export var JugglerFactory = function() {
   return jugglerInstance;
 };
-
diff --git a/browser_patches/firefox/juggler/content/Runtime.js b/browser_patches/firefox/juggler/content/Runtime.js
index a29af41b20..78c05de7ac 100644
--- a/browser_patches/firefox/juggler/content/Runtime.js
+++ b/browser_patches/firefox/juggler/content/Runtime.js
@@ -56,6 +56,10 @@ const disallowedMessageCategories = new Set([
 class Runtime {
   constructor(isWorker = false) {
     this._debugger = new Debugger();
+    // A debuggee global with these flags unset is pinned to the debuggable wasm/asm.js
+    // baseline tier, with the optimizing compiler disabled entirely.
+    this._debugger.allowUnobservedWasm = true;
+    this._debugger.allowUnobservedAsmJS = true;
     this._pendingPromises = new Map();
     this._executionContexts = new Map();
     this._windowToExecutionContext = new Map();
@@ -257,29 +261,37 @@ class Runtime {
       resolve = a;
       reject = b;
     });
-    this._pendingPromises.set(obj.promiseID, {resolve, reject, executionContext, exceptionDetails});
+    this._pendingPromises.set(obj.promiseID, {resolve, reject, executionContext, exceptionDetails, promiseObj: obj});
+    // Debugger.onPromiseSettled hook was removed in Bug 2044167. Instead, attach
+    // reactions inside the debuggee that run a `debugger;` statement upon settling,
+    // and sweep pending promises from the onDebuggerStatement hook. Unlike
+    // dereferencing the promise and adding reactions from the privileged
+    // compartment, this also works in workers where there are no Xrays.
     if (this._pendingPromises.size === 1)
-      this._debugger.onPromiseSettled = this._onPromiseSettled.bind(this);
+      this._debugger.onDebuggerStatement = this._onDebuggerStatement.bind(this);
+    executionContext._debuggee.executeInGlobalWithBindings(
+        'p.then(() => { debugger; }, () => { debugger; })', {p: obj}, {useInnerBindings: true});
     return await promise;
   }
 
-  _onPromiseSettled(obj) {
-    const pendingPromise = this._pendingPromises.get(obj.promiseID);
-    if (!pendingPromise)
-      return;
-    this._pendingPromises.delete(obj.promiseID);
+  _onDebuggerStatement() {
+    for (const [promiseID, pendingPromise] of this._pendingPromises) {
+      const obj = pendingPromise.promiseObj;
+      if (obj.promiseState === 'pending')
+        continue;
+      this._pendingPromises.delete(promiseID);
+      if (obj.promiseState === 'fulfilled') {
+        pendingPromise.resolve({success: true, obj: obj.promiseValue});
+        continue;
+      }
+      const debuggee = pendingPromise.executionContext._debuggee;
+      const errorInfo = debuggee.executeInGlobalWithBindings('({m: e?.message, s: e?.stack})', {e: obj.promiseReason}, {useInnerBindings: true}).return;
+      pendingPromise.exceptionDetails.text = errorInfo.getOwnPropertyDescriptor('m').value;
+      pendingPromise.exceptionDetails.stack = errorInfo.getOwnPropertyDescriptor('s').value;
+      pendingPromise.resolve({success: false, obj: null});
+    }
     if (!this._pendingPromises.size)
-      this._debugger.onPromiseSettled = undefined;
-
-    if (obj.promiseState === 'fulfilled') {
-      pendingPromise.resolve({success: true, obj: obj.promiseValue});
-      return;
-    };
-    const debuggee = pendingPromise.executionContext._debuggee;
-    const errorInfo = debuggee.executeInGlobalWithBindings('({m: e?.message, s: e?.stack})', {e: obj.promiseReason}, {useInnerBindings: true}).return;
-    pendingPromise.exceptionDetails.text = errorInfo.getOwnPropertyDescriptor('m').value;
-    pendingPromise.exceptionDetails.stack = errorInfo.getOwnPropertyDescriptor('s').value;
-    pendingPromise.resolve({success: false, obj: null});
+      this._debugger.onDebuggerStatement = undefined;
   }
 
   createExecutionContext(domWindow, contextGlobal, auxData) {
@@ -307,7 +319,7 @@ class Runtime {
       }
     }
     if (!this._pendingPromises.size)
-      this._debugger.onPromiseSettled = undefined;
+      this._debugger.onDebuggerStatement = undefined;
     this._debugger.removeDebuggee(destroyedContext._contextGlobal);
     this._executionContexts.delete(destroyedContext._id);
     if (destroyedContext._domWindow)
diff --git a/browser_patches/firefox/juggler/content/WorkerMain.js b/browser_patches/firefox/juggler/content/WorkerMain.js
index 99a6623e76..555a97a874 100644
--- a/browser_patches/firefox/juggler/content/WorkerMain.js
+++ b/browser_patches/firefox/juggler/content/WorkerMain.js
@@ -22,6 +22,10 @@ const runtime = new Runtime(true /* isWorker */);
   // Create execution context in the runtime only when the script
   // source was actually evaluated in it.
   const dbg = new Debugger(global);
+  // A debuggee global with these flags unset is pinned to the debuggable wasm/asm.js
+  // baseline tier, with the optimizing compiler disabled entirely.
+  dbg.allowUnobservedWasm = true;
+  dbg.allowUnobservedAsmJS = true;
   if (dbg.findScripts({global}).length) {
     runtime.createExecutionContext(null /* domWindow */, global, {});
   } else {
diff --git a/browser_patches/firefox/patches/bootstrap.diff b/browser_patches/firefox/patches/bootstrap.diff
index bf56dc51a6..be41cd9731 100644
--- a/browser_patches/firefox/patches/bootstrap.diff
+++ b/browser_patches/firefox/patches/bootstrap.diff
@@ -31,7 +31,7 @@ index 8337336dc894b44ea696bb780e448dfbdd8b6357..9eb83f33bb0415f28d1bcf66507d33d0
    DWORD creationFlags = CREATE_SUSPENDED | CREATE_UNICODE_ENVIRONMENT;
  
 diff --git a/browser/installer/allowed-dupes.mn b/browser/installer/allowed-dupes.mn
-index 96706c155f4dd317d93d7e5bf18f67598cce66a4..8f61011841cf06689a59210fb021d23f81db4fa1 100644
+index 3bc36691ce4b754fb80fa7d81d47dba786669dac..dbd3d465f66801e167e6e26d6eb6c474b4b1532c 100644
 --- a/browser/installer/allowed-dupes.mn
 +++ b/browser/installer/allowed-dupes.mn
 @@ -66,6 +66,12 @@ browser/chrome/browser/builtin-addons/webcompat/shims/empty-shim.txt
@@ -48,10 +48,10 @@ index 96706c155f4dd317d93d7e5bf18f67598cce66a4..8f61011841cf06689a59210fb021d23f
  browser/chrome/browser/content/activity-stream/data/content/tippytop/favicons/allegro-pl.ico
  browser/defaults/settings/main/search-config-icons/96327a73-c433-5eb4-a16d-b090cadfb80b
 diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
-index 203811a0fb980b47f113729cb1a16f56f376bfe5..83ac2cc8cdae99006fbc34319ed854c8ef88fcc4 100644
+index 9944fbec40229fe327cd311eb74be04f1d0f8b92..b3b60437eeb7ee729a3be040b8af7f0f738fa6c8 100644
 --- a/browser/installer/package-manifest.in
 +++ b/browser/installer/package-manifest.in
-@@ -204,6 +204,9 @@
+@@ -195,6 +195,9 @@
  @RESPATH@/chrome/remote.manifest
  #endif
  
@@ -109,10 +109,10 @@ index 257e87fe0c618684eb4216c8028ac886ef2d5562..8c13f020100dad9bc4e093d50bd3a1f9
    const transportProvider = {
      setListener(upgradeListener) {
 diff --git a/docshell/base/BrowsingContext.cpp b/docshell/base/BrowsingContext.cpp
-index d7155e79364de64fbf90c7fa37ac1713ed00bfa3..b38aece7733011cad0eac055c560e42b85ad467b 100644
+index 6662d0e720008838d4130ce6201ddac5f8390c98..40d41d987b6d59fddaac238cff86affe720bc9ed 100644
 --- a/docshell/base/BrowsingContext.cpp
 +++ b/docshell/base/BrowsingContext.cpp
-@@ -118,8 +118,11 @@ struct ParamTraits<mozilla::dom::DisplayMode>
+@@ -119,8 +119,11 @@ struct ParamTraits<mozilla::dom::DisplayMode>
  
  template <>
  struct ParamTraits<mozilla::dom::PrefersColorSchemeOverride>
@@ -126,7 +126,7 @@ index d7155e79364de64fbf90c7fa37ac1713ed00bfa3..b38aece7733011cad0eac055c560e42b
  
  template <>
  struct ParamTraits<mozilla::dom::ForcedColorsOverride>
-@@ -489,7 +492,11 @@ already_AddRefed<BrowsingContext> BrowsingContext::CreateDetached(
+@@ -484,7 +487,11 @@ already_AddRefed<BrowsingContext> BrowsingContext::CreateDetached(
  
    fields.Get<IDX_UseErrorPages>() = true;
  
@@ -139,7 +139,7 @@ index d7155e79364de64fbf90c7fa37ac1713ed00bfa3..b38aece7733011cad0eac055c560e42b
  
    fields.Get<IDX_AllowJavascript>() =
        inherit ? inherit->GetAllowJavascript() : true;
-@@ -3544,6 +3551,15 @@ void BrowsingContext::DidSet(FieldIndex<IDX_LanguageOverride>,
+@@ -3558,6 +3565,15 @@ void BrowsingContext::DidSet(FieldIndex<IDX_LanguageOverride>,
    });
  }
  
@@ -155,17 +155,17 @@ index d7155e79364de64fbf90c7fa37ac1713ed00bfa3..b38aece7733011cad0eac055c560e42b
  void BrowsingContext::DidSet(FieldIndex<IDX_MediumOverride>,
                               nsString&& aOldValue) {
    MOZ_ASSERT(IsTop());
-@@ -3824,7 +3840,7 @@ void BrowsingContext::SetGeolocationServiceOverride(
+@@ -3838,7 +3854,7 @@ void BrowsingContext::SetGeolocationServiceOverride(
    if (aGeolocationOverride.WasPassed()) {
      if (!mGeolocationServiceOverride) {
-       mGeolocationServiceOverride = MakeRefPtr<nsGeolocationService>();
+       mGeolocationServiceOverride = MakeRefPtr<GeolocationService>();
 -      mGeolocationServiceOverride->Init();
 +      mGeolocationServiceOverride->Init(true /* isOverride */);
      }
      mGeolocationServiceOverride->Update(aGeolocationOverride.Value());
-   } else if (RefPtr<nsGeolocationService> serviceOverride =
+   } else if (RefPtr<GeolocationService> serviceOverride =
 diff --git a/docshell/base/BrowsingContext.h b/docshell/base/BrowsingContext.h
-index 6f7f58bba3be6f08b3b27e81f30864c61d683351..ac0d2dc75f3f9e99e97100958108f4504292283f 100644
+index aba8b50b04a5f8abe6670cddf16313a0f3156dbd..c9054e883de27f45796d644286f49e79210c2bf1 100644
 --- a/docshell/base/BrowsingContext.h
 +++ b/docshell/base/BrowsingContext.h
 @@ -211,11 +211,11 @@ struct EmbedderColorSchemes {
@@ -225,10 +225,10 @@ index 6f7f58bba3be6f08b3b27e81f30864c61d683351..ac0d2dc75f3f9e99e97100958108f450
    void WalkPresContexts(Callback&&);
    void PresContextAffectingFieldChanged();
 diff --git a/docshell/base/CanonicalBrowsingContext.cpp b/docshell/base/CanonicalBrowsingContext.cpp
-index 00c69a2310f1056e8ef1199156cb593140af8a63..c6f5181e71b952fe36d83640eb776aa55c31eb2c 100644
+index 4a2127ed9b7e8b16a496b56e3382d910750b7a0e..c310686b8dc17da8def684df49fc0fbfa2a13afd 100644
 --- a/docshell/base/CanonicalBrowsingContext.cpp
 +++ b/docshell/base/CanonicalBrowsingContext.cpp
-@@ -303,6 +303,11 @@ void CanonicalBrowsingContext::ReplacedBy(
+@@ -316,6 +316,11 @@ void CanonicalBrowsingContext::ReplacedBy(
    txn.SetInnerSizeSpoofedForRFP(GetInnerSizeSpoofedForRFP());
    txn.SetIPAddressSpace(GetIPAddressSpace());
    txn.SetParentalControlsEnabled(GetParentalControlsEnabled());
@@ -240,7 +240,7 @@ index 00c69a2310f1056e8ef1199156cb593140af8a63..c6f5181e71b952fe36d83640eb776aa5
  
    if (!GetLanguageOverride().IsEmpty()) {
      // Reapply language override to update the corresponding realm.
-@@ -1946,6 +1951,12 @@ void CanonicalBrowsingContext::LoadURI(nsIURI* aURI,
+@@ -1976,6 +1981,12 @@ void CanonicalBrowsingContext::LoadURI(nsIURI* aURI,
      (void)SetIsCaptivePortalTab(true);
    }
  
@@ -254,7 +254,7 @@ index 00c69a2310f1056e8ef1199156cb593140af8a63..c6f5181e71b952fe36d83640eb776aa5
  }
  
 diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
-index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9a0519489 100644
+index 5a6d13023782c1b4f677b9a8cc88491d0ea5f533..312899d39bf4d9fe2515bc32b8fa8c8da9eee652 100644
 --- a/docshell/base/nsDocShell.cpp
 +++ b/docshell/base/nsDocShell.cpp
 @@ -16,6 +16,12 @@
@@ -270,7 +270,15 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  #include "mozilla/Attributes.h"
  #include "mozilla/AutoRestore.h"
  #include "mozilla/BasePrincipal.h"
-@@ -64,6 +70,7 @@
+@@ -51,6 +57,7 @@
+ #include "mozilla/Telemetry.h"
+ 
+ #include "mozilla/WidgetUtils.h"
++#include "mozilla/GeolocationService.h"
+ 
+ #include "mozilla/dom/AutoEntryScript.h"
+ #include "mozilla/dom/ChildProcessChannelListener.h"
+@@ -64,6 +71,7 @@
  #include "mozilla/dom/DocGroup.h"
  #include "mozilla/dom/Element.h"
  #include "mozilla/dom/FragmentDirective.h"
@@ -278,7 +286,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  #include "mozilla/dom/HTMLAnchorElement.h"
  #include "mozilla/dom/HTMLIFrameElement.h"
  #include "mozilla/dom/Navigation.h"
-@@ -96,6 +103,7 @@
+@@ -96,6 +104,7 @@
  #include "mozilla/dom/DocumentBinding.h"
  #include "mozilla/glean/DocshellMetrics.h"
  #include "mozilla/ipc/ProtocolUtils.h"
@@ -286,7 +294,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  #include "mozilla/net/DocumentChannel.h"
  #include "mozilla/net/DocumentChannelChild.h"
  #include "mozilla/net/ParentChannelWrapper.h"
-@@ -120,6 +128,7 @@
+@@ -120,6 +129,7 @@
  #include "nsIDocumentViewer.h"
  #include "mozilla/dom/Document.h"
  #include "nsHTMLDocument.h"
@@ -294,7 +302,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  #include "nsIDocumentLoaderFactory.h"
  #include "nsIDOMWindow.h"
  #include "nsIEditingSession.h"
-@@ -215,6 +224,7 @@
+@@ -216,6 +226,7 @@
  #include "nsGlobalWindowInner.h"
  #include "nsGlobalWindowOuter.h"
  #include "nsJSEnvironment.h"
@@ -302,7 +310,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  #include "nsNetCID.h"
  #include "nsNetUtil.h"
  #include "nsObjectLoadingContent.h"
-@@ -355,6 +365,14 @@ nsDocShell::nsDocShell(BrowsingContext* aBrowsingContext,
+@@ -356,6 +367,14 @@ nsDocShell::nsDocShell(BrowsingContext* aBrowsingContext,
        mAllowDNSPrefetch(true),
        mAllowWindowControl(true),
        mCSSErrorReportingEnabled(false),
@@ -317,7 +325,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
        mAllowAuth(mItemType == typeContent),
        mAllowKeywordFixup(false),
        mDisableMetaRefreshWhenInactive(false),
-@@ -2976,6 +2994,174 @@ nsDocShell::GetMessageManager(ContentFrameMessageManager** aMessageManager) {
+@@ -2978,6 +2997,174 @@ nsDocShell::GetMessageManager(ContentFrameMessageManager** aMessageManager) {
    return NS_OK;
  }
  
@@ -415,7 +423,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
 +      ToSupports(element), "juggler-file-picker-shown", nullptr);
 +}
 +
-+RefPtr<nsGeolocationService> nsDocShell::GetGeolocationServiceOverride() {
++RefPtr<GeolocationService> nsDocShell::GetGeolocationServiceOverride() {
 +  return GetRootDocShell()->mGeolocationServiceOverride;
 +}
 +
@@ -423,8 +431,8 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
 +nsDocShell::SetGeolocationOverride(nsIDOMGeoPosition* aGeolocationOverride) {
 +  if (aGeolocationOverride) {
 +    if (!mGeolocationServiceOverride) {
-+      mGeolocationServiceOverride = new nsGeolocationService();
-+      mGeolocationServiceOverride->Init();
++      mGeolocationServiceOverride = new GeolocationService();
++      mGeolocationServiceOverride->Init(true /* isOverride */);
 +    }
 +    mGeolocationServiceOverride->Update(aGeolocationOverride);
 +  } else {
@@ -492,7 +500,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
  NS_IMETHODIMP
  nsDocShell::GetIsNavigating(bool* aOut) {
    *aOut = mIsNavigating;
-@@ -4655,7 +4841,7 @@ nsDocShell::GetVisibility(bool* aVisibility) {
+@@ -4671,7 +4858,7 @@ nsDocShell::GetVisibility(bool* aVisibility) {
  }
  
  void nsDocShell::ActivenessMaybeChanged() {
@@ -501,7 +509,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
    if (RefPtr<PresShell> presShell = GetPresShell()) {
      presShell->ActivenessMaybeChanged();
    }
-@@ -7651,6 +7837,12 @@ nsresult nsDocShell::PerformRetargeting(nsDocShellLoadState* aLoadState) {
+@@ -7686,6 +7873,12 @@ nsresult nsDocShell::PerformRetargeting(nsDocShellLoadState* aLoadState) {
                       true,  // aForceNoOpener
                       getter_AddRefs(newBC));
        MOZ_ASSERT(!newBC);
@@ -514,7 +522,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
        return rv;
      }
  
-@@ -8883,6 +9075,16 @@ nsresult nsDocShell::InternalLoad(nsDocShellLoadState* aLoadState,
+@@ -8926,6 +9119,16 @@ nsresult nsDocShell::InternalLoad(nsDocShellLoadState* aLoadState,
    attrs.SetFirstPartyDomain(isTopLevelDoc, aLoadState->URI());
  
    nsCOMPtr<nsIRequest> req;
@@ -531,7 +539,7 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
    rv = DoURILoad(aLoadState, aCacheKey, getter_AddRefs(req));
  
    if (NS_SUCCEEDED(rv)) {
-@@ -12019,6 +12221,9 @@ class OnLinkClickEvent : public Runnable {
+@@ -12036,6 +12239,9 @@ class OnLinkClickEvent : public CancelableRunnable, public SupportsWeakPtr {
        mHandler->OnLinkClickSync(mContent, mLoadState, mNoOpenerImplied,
                                  mTriggeringPrincipal);
      }
@@ -541,20 +549,32 @@ index 275d0ce1d33e7aa887eebeadac786aac44e0ba10..bff2b58d2169bbd40aa4ac48c656d7f9
      return NS_OK;
    }
  
-@@ -12136,6 +12341,8 @@ nsresult nsDocShell::OnLinkClick(
+@@ -12107,6 +12313,11 @@ nsresult nsDocShell::OnFormSubmit(HTMLFormElement* aForm,
+     return OnLinkClickSync(aForm, aLoadState, false, aForm->NodePrincipal());
+   }
+ 
++  nsCOMPtr<nsIObserverService> observerService =
++      mozilla::services::GetObserverService();
++  observerService->NotifyObservers(ToSupports(aForm), "juggler-link-click",
++                                   nullptr);
++
+   auto result = OnLinkClickWithLoadState(aForm, aLoadState, false,
+                                          aForm->NodePrincipal());
+   if (result.isErr()) {
+@@ -12245,6 +12456,8 @@ nsresult nsDocShell::OnLinkClick(
+       ownerDoc->GetScriptTrackingFlags());
+   loadState->SetHistoryBehavior(NavigationHistoryBehavior::Auto);
  
-   RefPtr ev = MakeRefPtr<OnLinkClickEvent>(
-       this, aContent, loadState, noOpenerImplied, aTriggeringPrincipal);
 +  nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
 +  observerService->NotifyObservers(ToSupports(aContent), "juggler-link-click", nullptr);
-   return Dispatch(ev.forget());
- }
- 
+   auto result = OnLinkClickWithLoadState(aContent, loadState, noOpenerImplied,
+                                          aTriggeringPrincipal);
+   return result.isErr() ? result.unwrapErr() : NS_OK;
 diff --git a/docshell/base/nsDocShell.h b/docshell/base/nsDocShell.h
-index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f28cc8c952 100644
+index 5b17b1b5a7b61f6032ad05fbc65fb6672a64c09c..008d49bd6d6f1a8e7290ca1b59a8babe988dfd9f 100644
 --- a/docshell/base/nsDocShell.h
 +++ b/docshell/base/nsDocShell.h
-@@ -15,6 +15,7 @@
+@@ -16,6 +16,7 @@
  #include "mozilla/dom/BrowsingContext.h"
  #include "mozilla/dom/NavigationBinding.h"
  #include "mozilla/dom/SessionHistoryEntry.h"
@@ -562,15 +582,15 @@ index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f2
  #include "mozilla/dom/WindowProxyHolder.h"
  #include "nsCOMPtr.h"
  #include "nsCharsetSource.h"
-@@ -84,6 +85,7 @@ class nsCommandManager;
- class nsDocShellEditorData;
- class nsDOMNavigationTiming;
- class nsDSURIContentListener;
-+class nsGeolocationService;
- class nsGlobalWindowOuter;
+@@ -42,6 +43,7 @@
  
- class FramingChecker;
-@@ -397,6 +399,15 @@ class nsDocShell final : public nsDocLoader,
+ namespace mozilla {
+ class Encoding;
++class GeolocationService;
+ class HTMLEditor;
+ class ObservedDocShell;
+ class ScrollContainerFrame;
+@@ -383,6 +385,15 @@ class nsDocShell final : public nsDocLoader,
    void SetWillChangeProcess() { mWillChangeProcess = true; }
    bool WillChangeProcess() { return mWillChangeProcess; }
  
@@ -581,12 +601,12 @@ index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f2
 +
 +  bool IsBypassCSPEnabled();
 +
-+  RefPtr<nsGeolocationService> GetGeolocationServiceOverride();
++  RefPtr<mozilla::GeolocationService> GetGeolocationServiceOverride();
 +
    // Creates a real network channel (not a DocumentChannel) using the specified
    // parameters.
    // Used by nsDocShell when not using DocumentChannel, by DocumentLoadListener
-@@ -988,6 +999,8 @@ class nsDocShell final : public nsDocLoader,
+@@ -1000,6 +1011,8 @@ class nsDocShell final : public nsDocLoader,
  
    bool CSSErrorReportingEnabled() const { return mCSSErrorReportingEnabled; }
  
@@ -595,7 +615,7 @@ index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f2
    // Handles retrieval of subframe session history for nsDocShell::LoadURI. If a
    // load is requested in a subframe of the current DocShell, the subframe
    // loadType may need to reflect the loadType of the parent document, or in
-@@ -1299,6 +1312,16 @@ class nsDocShell final : public nsDocLoader,
+@@ -1323,6 +1336,16 @@ class nsDocShell final : public nsDocLoader,
    bool mAllowDNSPrefetch : 1;
    bool mAllowWindowControl : 1;
    bool mCSSErrorReportingEnabled : 1;
@@ -604,7 +624,7 @@ index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f2
 +  bool mBypassCSPEnabled : 1;
 +  bool mForceActiveState : 1;
 +  bool mDisallowBFCache : 1;
-+  RefPtr<nsGeolocationService> mGeolocationServiceOverride;
++  RefPtr<mozilla::GeolocationService> mGeolocationServiceOverride;
 +  ReducedMotionOverride mReducedMotionOverride;
 +  ForcedColorsOverride mForcedColorsOverride;
 +  ContrastOverride mContrastOverride;
@@ -613,7 +633,7 @@ index aa834b35a1fb2ff6fe3cdd6de9582e48da510be5..ee2f86ddd28a9e18ee33cf509438b5f2
    bool mAllowKeywordFixup : 1;
    bool mDisableMetaRefreshWhenInactive : 1;
 diff --git a/docshell/base/nsIDocShell.idl b/docshell/base/nsIDocShell.idl
-index 4aa56b4ce16915d334f32c18953604765699e05a..ef80a46511d870c909dda6182e332c155a8e250c 100644
+index db0721841de3732d297b1ca31ae009e9e6a5356b..2c95a3ebbc437d31d393b5243b923f4f6a1f3483 100644
 --- a/docshell/base/nsIDocShell.idl
 +++ b/docshell/base/nsIDocShell.idl
 @@ -43,6 +43,7 @@ interface nsIURI;
@@ -667,10 +687,10 @@ index 4aa56b4ce16915d334f32c18953604765699e05a..ef80a46511d870c909dda6182e332c15
     * This attempts to save any applicable layout history state (like
     * scroll position) in the nsISHEntry. This is normally done
 diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
-index 1081a150609c6068cde605228da6e95f84f06d6b..f51d5f53ea1d8985e7f75e4aba2a6996ac594d21 100644
+index 9602541b0cb109fdfb0051ac0419f1a2b3d9527e..50e4b92b62e557880d6e75dfeda5a3f1e5528838 100644
 --- a/dom/base/Document.cpp
 +++ b/dom/base/Document.cpp
-@@ -3655,6 +3655,9 @@ void Document::SendToConsole(nsCOMArray<nsISecurityConsoleMessage>& aMessages) {
+@@ -3845,6 +3845,9 @@ void Document::SendToConsole(nsCOMArray<nsISecurityConsoleMessage>& aMessages) {
  }
  
  void Document::ApplySettingsFromCSP(bool aSpeculative) {
@@ -680,7 +700,7 @@ index 1081a150609c6068cde605228da6e95f84f06d6b..f51d5f53ea1d8985e7f75e4aba2a6996
    nsresult rv = NS_OK;
    if (!aSpeculative) {
      nsIContentSecurityPolicy* csp = PolicyContainer::GetCSP(mPolicyContainer);
-@@ -3752,6 +3755,11 @@ nsresult Document::InitCSP(nsIChannel* aChannel) {
+@@ -3942,6 +3945,11 @@ nsresult Document::InitCSP(nsIChannel* aChannel) {
    MOZ_ASSERT(mPolicyContainer,
               "Policy container must be initialized before CSP!");
  
@@ -692,7 +712,7 @@ index 1081a150609c6068cde605228da6e95f84f06d6b..f51d5f53ea1d8985e7f75e4aba2a6996
    // If this is a data document - no need to set CSP.
    if (mLoadedAsData) {
      return NS_OK;
-@@ -4722,6 +4730,10 @@ bool Document::HasFocus(ErrorResult& rv) const {
+@@ -4923,6 +4931,10 @@ bool Document::HasFocus(ErrorResult& rv) const {
      return false;
    }
  
@@ -704,10 +724,10 @@ index 1081a150609c6068cde605228da6e95f84f06d6b..f51d5f53ea1d8985e7f75e4aba2a6996
      return false;
    }
 diff --git a/dom/base/Navigator.cpp b/dom/base/Navigator.cpp
-index 079746f77996ca03464c8f30b00cd34817b8430d..770a58853159c5d4972aab6002ab68254ee22360 100644
+index 818005d2cf111f84d891d7f4f925fbaa193ad873..ccf2153d03a77e322d9d771cbce2ec4758718ac4 100644
 --- a/dom/base/Navigator.cpp
 +++ b/dom/base/Navigator.cpp
-@@ -2381,7 +2381,8 @@ bool Navigator::Webdriver() {
+@@ -2371,7 +2371,8 @@ bool Navigator::Webdriver() {
    }
  #endif
  
@@ -718,10 +738,10 @@ index 079746f77996ca03464c8f30b00cd34817b8430d..770a58853159c5d4972aab6002ab6825
  
  AutoplayPolicy Navigator::GetAutoplayPolicy(AutoplayPolicyMediaType aType) {
 diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
-index 55a786dd5bb66d2bb51568407bc942c8ac2e5fe4..c73e34868b03a11b44d195f419fb3fb2e7869965 100644
+index d5c7b398dfb967c4cf283264857c3037fa47f16f..9e1a463705fe962c4266463df1aebb18b914fbfc 100644
 --- a/dom/base/nsContentUtils.cpp
 +++ b/dom/base/nsContentUtils.cpp
-@@ -9873,6 +9873,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
+@@ -10380,6 +10380,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
    EventMessage msg;
    Maybe<WidgetMouseEvent::ExitFrom> exitFrom;
    bool contextMenuKey = false;
@@ -729,7 +749,7 @@ index 55a786dd5bb66d2bb51568407bc942c8ac2e5fe4..c73e34868b03a11b44d195f419fb3fb2
    if (aType.EqualsLiteral("mousedown")) {
      msg = eMouseDown;
    } else if (aType.EqualsLiteral("mouseup")) {
-@@ -9899,13 +9900,26 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
+@@ -10406,13 +10407,26 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
      msg = eMouseHitTest;
    } else if (aType.EqualsLiteral("MozMouseExploreByTouch")) {
      msg = eMouseExploreByTouch;
@@ -757,7 +777,7 @@ index 55a786dd5bb66d2bb51568407bc942c8ac2e5fe4..c73e34868b03a11b44d195f419fb3fb2
      if (MOZ_UNLIKELY(aOptions.mIsWidgetEventSynthesized)) {
        MOZ_ASSERT_UNREACHABLE(
            "The event shouldn't be dispatched as a synthesized event");
-@@ -9933,6 +9947,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
+@@ -10440,6 +10454,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
    mozilla::widget::AutoSynthesizedEventCallbackNotifier notifier(callback);
  
    WidgetMouseEvent& mouseOrPointerEvent =
@@ -765,7 +785,7 @@ index 55a786dd5bb66d2bb51568407bc942c8ac2e5fe4..c73e34868b03a11b44d195f419fb3fb2
        pointerEvent.isSome() ? pointerEvent.ref() : mouseEvent.ref();
    mouseOrPointerEvent.pointerId = aMouseEventData.mIdentifier;
    mouseOrPointerEvent.mModifiers =
-@@ -9958,6 +9973,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
+@@ -10465,6 +10480,7 @@ Result<bool, nsresult> nsContentUtils::SynthesizeMouseEvent(
        aOptions.mIsDOMEventSynthesized;
    mouseOrPointerEvent.mExitFrom = std::move(exitFrom);
    mouseOrPointerEvent.mCallbackId = notifier.SaveCallback();
@@ -774,10 +794,10 @@ index 55a786dd5bb66d2bb51568407bc942c8ac2e5fe4..c73e34868b03a11b44d195f419fb3fb2
    nsPresContext* presContext = aPresShell->GetPresContext();
    if (!presContext) {
 diff --git a/dom/base/nsFocusManager.cpp b/dom/base/nsFocusManager.cpp
-index ed255ae7f0f3c3465f4d38a8af2a7899e0dbf3b9..aa60b5bdc059121ac7a9163a40f0d9d23afa5195 100644
+index c9a6ee9c507129ab6fdd1deca98b368eb48170d5..a312a2d1bfdc1d6551d78242b1ddf03975249408 100644
 --- a/dom/base/nsFocusManager.cpp
 +++ b/dom/base/nsFocusManager.cpp
-@@ -1875,6 +1875,10 @@ Maybe<uint64_t> nsFocusManager::SetFocusInner(Element* aNewContent,
+@@ -1867,6 +1867,10 @@ Maybe<uint64_t> nsFocusManager::SetFocusInner(Element* aNewContent,
          (GetActiveBrowsingContext() == newRootBrowsingContext);
    }
  
@@ -788,7 +808,7 @@ index ed255ae7f0f3c3465f4d38a8af2a7899e0dbf3b9..aa60b5bdc059121ac7a9163a40f0d9d2
    // Exit fullscreen if a website focuses another window
    if (StaticPrefs::full_screen_api_exit_on_windowRaise() &&
        !isElementInActiveWindow && (aFlags & FLAG_RAISE)) {
-@@ -2436,6 +2440,7 @@ bool nsFocusManager::BlurImpl(BrowsingContext* aBrowsingContextToClear,
+@@ -2428,6 +2432,7 @@ bool nsFocusManager::BlurImpl(BrowsingContext* aBrowsingContextToClear,
                                bool aIsLeavingDocument, bool aAdjustWidget,
                                bool aRemainActive, Element* aElementToFocus,
                                uint64_t aActionId) {
@@ -796,7 +816,7 @@ index ed255ae7f0f3c3465f4d38a8af2a7899e0dbf3b9..aa60b5bdc059121ac7a9163a40f0d9d2
    LOGFOCUS(("<<Blur begin actionid: %" PRIu64 ">>", aActionId));
  
    // hold a reference to the focused content, which may be null
-@@ -2479,6 +2484,11 @@ bool nsFocusManager::BlurImpl(BrowsingContext* aBrowsingContextToClear,
+@@ -2471,6 +2476,11 @@ bool nsFocusManager::BlurImpl(BrowsingContext* aBrowsingContextToClear,
      return true;
    }
  
@@ -808,7 +828,7 @@ index ed255ae7f0f3c3465f4d38a8af2a7899e0dbf3b9..aa60b5bdc059121ac7a9163a40f0d9d2
    // Keep a ref to presShell since dispatching the DOM event may cause
    // the document to be destroyed.
    RefPtr<PresShell> presShell = docShell->GetPresShell();
-@@ -3181,7 +3191,9 @@ void nsFocusManager::RaiseWindow(nsPIDOMWindowOuter* aWindow,
+@@ -3180,7 +3190,9 @@ void nsFocusManager::RaiseWindow(nsPIDOMWindowOuter* aWindow,
      }
    }
  
@@ -820,10 +840,10 @@ index ed255ae7f0f3c3465f4d38a8af2a7899e0dbf3b9..aa60b5bdc059121ac7a9163a40f0d9d2
      // care of lowering the present active window. This happens in
      // a separate runnable to avoid touching multiple windows in
 diff --git a/dom/base/nsGlobalWindowOuter.cpp b/dom/base/nsGlobalWindowOuter.cpp
-index 0fbb9d9e11c72f862d5777a0554a142336f8f17f..80ce0fc7a1b42722eb55a4a2e03af4022126a374 100644
+index b9caf10ddbecb6c3ac5d5483403a09243befcde1..7a3d9923405cee8eb4936d028c2df2c933d3293e 100644
 --- a/dom/base/nsGlobalWindowOuter.cpp
 +++ b/dom/base/nsGlobalWindowOuter.cpp
-@@ -2535,10 +2535,16 @@ nsresult nsGlobalWindowOuter::SetNewDocument(Document* aDocument,
+@@ -2534,10 +2534,16 @@ nsresult nsGlobalWindowOuter::SetNewDocument(Document* aDocument,
      }();
  
      if (!isAboutBlankInChromeDocshell) {
@@ -844,7 +864,7 @@ index 0fbb9d9e11c72f862d5777a0554a142336f8f17f..80ce0fc7a1b42722eb55a4a2e03af402
      }
    }
  
-@@ -2658,6 +2664,19 @@ void nsGlobalWindowOuter::DispatchDOMWindowCreated() {
+@@ -2657,6 +2663,19 @@ void nsGlobalWindowOuter::DispatchDOMWindowCreated() {
    }
  }
  
@@ -877,10 +897,10 @@ index fa95821e51984beb7e4672bb82038adb0f8e97d2..08b765dfee64001bde59f99704046246
    // Outer windows only.
    virtual void EnsureSizeAndPositionUpToDate() override;
 diff --git a/dom/base/nsINode.cpp b/dom/base/nsINode.cpp
-index 5b21525de8dc0cc86bd14e2b36fcd9f0059a030a..65c6027e614bb8566a7a24bac6a7b75aa93d4032 100644
+index d1564d960952c0c2b4caf9c485309f7ddfb52257..eff181a2fd215bd3e9d3d5703012e9fa3fdf4a4d 100644
 --- a/dom/base/nsINode.cpp
 +++ b/dom/base/nsINode.cpp
-@@ -1803,6 +1803,61 @@ void nsINode::GetBoxQuadsFromWindowOrigin(const BoxQuadOptions& aOptions,
+@@ -1980,6 +1980,61 @@ void nsINode::GetBoxQuadsFromWindowOrigin(const BoxQuadOptions& aOptions,
    mozilla::GetBoxQuadsFromWindowOrigin(this, aOptions, aResult, aRv);
  }
  
@@ -943,10 +963,10 @@ index 5b21525de8dc0cc86bd14e2b36fcd9f0059a030a..65c6027e614bb8566a7a24bac6a7b75a
      DOMQuad& aQuad, const GeometryNode& aFrom,
      const ConvertCoordinateOptions& aOptions, CallerType aCallerType,
 diff --git a/dom/base/nsINode.h b/dom/base/nsINode.h
-index 4c882db32fb458c4e88dc35cdf6ea4c2ce6675f0..0b5ad5cb09b36bde91ddf5390e2e520c76bf6f49 100644
+index 271c98870e2ed923dfde62635de9557eda90864c..16c69324c83735792894130bf1a8728e16d8d0b0 100644
 --- a/dom/base/nsINode.h
 +++ b/dom/base/nsINode.h
-@@ -2551,6 +2551,10 @@ class nsINode : public mozilla::dom::EventTarget {
+@@ -3057,6 +3057,10 @@ class nsINode : public mozilla::dom::EventTarget {
                                     nsTArray<RefPtr<DOMQuad>>& aResult,
                                     ErrorResult& aRv);
  
@@ -958,7 +978,7 @@ index 4c882db32fb458c4e88dc35cdf6ea4c2ce6675f0..0b5ad5cb09b36bde91ddf5390e2e520c
        DOMQuad& aQuad, const TextOrElementOrDocument& aFrom,
        const ConvertCoordinateOptions& aOptions, CallerType aCallerType,
 diff --git a/dom/chrome-webidl/BrowsingContext.webidl b/dom/chrome-webidl/BrowsingContext.webidl
-index d0508a8c29e5bd008213f781beb8eb1fcb458fb8..518580aa7a2eb355f690d904d091e80c34a98912 100644
+index 91b2d3ccaad070d887b609ef5a92147cc16a4d12..35c581dd07c3f6defc4ad87f27456189d057b4ff 100644
 --- a/dom/chrome-webidl/BrowsingContext.webidl
 +++ b/dom/chrome-webidl/BrowsingContext.webidl
 @@ -72,6 +72,17 @@ enum PrefersReducedMotionOverride {
@@ -990,10 +1010,10 @@ index d0508a8c29e5bd008213f781beb8eb1fcb458fb8..518580aa7a2eb355f690d904d091e80c
     * A unique identifier for the browser element that is hosting this
     * BrowsingContext tree. Every BrowsingContext in the element's tree will
 diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
-index f95ba91a36f5b4ac906a2d37a814d6eb42b31151..8e373d2e6eee50f60aa12c2651bf8c3fc7c35b8a 100644
+index c1f865f86435f58b29c582005f60eab739548de5..552e5358951786d6d446cc5b0b0b7d39445409cd 100644
 --- a/dom/events/EventStateManager.cpp
 +++ b/dom/events/EventStateManager.cpp
-@@ -2104,6 +2104,25 @@ static BrowserParent* GetBrowserParentAncestor(BrowserParent* aBrowserParent) {
+@@ -2110,6 +2110,25 @@ static BrowserParent* GetBrowserParentAncestor(BrowserParent* aBrowserParent) {
    return bbp->Manager();
  }
  
@@ -1019,7 +1039,7 @@ index f95ba91a36f5b4ac906a2d37a814d6eb42b31151..8e373d2e6eee50f60aa12c2651bf8c3f
  static void DispatchCrossProcessMouseExitEvents(WidgetMouseEvent* aMouseEvent,
                                                  BrowserParent* aRemoteTarget,
                                                  BrowserParent* aStopAncestor,
-@@ -2227,7 +2246,7 @@ void EventStateManager::DispatchCrossProcessEvent(WidgetEvent* aEvent,
+@@ -2233,7 +2252,7 @@ void EventStateManager::DispatchCrossProcessEvent(WidgetEvent* aEvent,
        if (mouseEvent->mReason == WidgetMouseEvent::eReal &&
            remote != oldRemote) {
          MOZ_ASSERT(mouseEvent->mMessage != eMouseExitFromWidget);
@@ -1048,15 +1068,15 @@ index 180065668131acf3738117c84b6a11117fcb6979..a4a77ca8e006fb298769270bb3342ff4
      auto& args = mArgs.as<WorkerFetchArgs>();
      mFetchDriver->SetWorkerScript(args.mWorkerScript);
 diff --git a/dom/geolocation/Geolocation.cpp b/dom/geolocation/Geolocation.cpp
-index 87b78f8d13a1a118eedb032d8feaf7d371e13844..f768f0549659263bc714b6339f9df859a1e33f9b 100644
+index 51efcf97c062e106575b88232a14f1702470fddf..1c68b997e4efd8896ec182e962c9e085ab24e7c7 100644
 --- a/dom/geolocation/Geolocation.cpp
 +++ b/dom/geolocation/Geolocation.cpp
-@@ -120,8 +120,12 @@ class nsGeolocationRequest final : public ContentPermissionRequestBase,
+@@ -103,8 +103,12 @@ class nsGeolocationRequest final : public ContentPermissionRequestBase,
  
    NS_IMETHOD GetIgnoreAllowSitePermission(
        bool* aIgnoreAllowSitePermission) override {
-+    RefPtr<nsGeolocationService> gs =
-+        nsGeolocationService::GetGeolocationService(
++    RefPtr<GeolocationService> gs =
++        GeolocationService::GetGeolocationService(
 +            mLocator->GetBrowsingContext());
      *aIgnoreAllowSitePermission =
 -        mBehavior != geolocation::SystemGeolocationPermissionBehavior::NoPrompt;
@@ -1065,99 +1085,30 @@ index 87b78f8d13a1a118eedb032d8feaf7d371e13844..f768f0549659263bc714b6339f9df859
      return NS_OK;
    }
  
-@@ -410,7 +414,9 @@ nsGeolocationRequest::Allow(JS::Handle<JS::Value> aChoices) {
+@@ -393,7 +397,11 @@ nsGeolocationRequest::Allow(JS::Handle<JS::Value> aChoices) {
          self->Cancel();
        };
  
 -  if (mBehavior != SystemGeolocationPermissionBehavior::NoPrompt) {
-+  RefPtr<nsGeolocationService> gs = nsGeolocationService::GetGeolocationService(
-+      mLocator->GetBrowsingContext());
-+  if (mBehavior != SystemGeolocationPermissionBehavior::NoPrompt && !gs->IsOverride()) {
++  RefPtr<GeolocationService> gs =
++      GeolocationService::GetGeolocationService(
++          mLocator->GetBrowsingContext());
++  if (mBehavior != SystemGeolocationPermissionBehavior::NoPrompt &&
++      !gs->IsOverride()) {
      // Asynchronously present the system dialog or open system preferences
      // (RequestGeolocationPermissionFromUser will know which to do), and wait
      // for the permission to change or the request to be canceled.  If the
-@@ -434,8 +440,6 @@ nsGeolocationRequest::Allow(JS::Handle<JS::Value> aChoices) {
+@@ -417,8 +425,6 @@ nsGeolocationRequest::Allow(JS::Handle<JS::Value> aChoices) {
      return NS_OK;
    }
  
--  RefPtr<nsGeolocationService> gs = nsGeolocationService::GetGeolocationService(
--      mLocator->GetBrowsingContext());
+-  RefPtr<GeolocationService> gs =
+-      GeolocationService::GetGeolocationService(mLocator->GetBrowsingContext());
    bool canUseCache = false;
    CachedPositionAndAccuracy lastPosition = gs->GetCachedPosition();
    if (lastPosition.position) {
-@@ -722,11 +726,16 @@ NS_INTERFACE_MAP_END
- NS_IMPL_ADDREF(nsGeolocationService)
- NS_IMPL_RELEASE(nsGeolocationService)
- 
--nsresult nsGeolocationService::Init() {
-+nsresult nsGeolocationService::Init(bool isOverride) {
-   if (!StaticPrefs::geo_enabled()) {
-     return NS_ERROR_FAILURE;
-   }
- 
-+  if (isOverride) {
-+    mIsOverride = true;
-+    mHigherAccuracy = true;
-+  }
-+
-   if (XRE_IsContentProcess()) {
-     return NS_OK;
-   }
-@@ -805,6 +814,10 @@ nsresult nsGeolocationService::Init() {
-   return NS_OK;
- }
- 
-+bool nsGeolocationService::IsOverride() {
-+  return mIsOverride;
-+}
-+
- nsGeolocationService::~nsGeolocationService() = default;
- 
- NS_IMETHODIMP
-@@ -948,6 +961,10 @@ bool nsGeolocationService::HighAccuracyRequested() {
- }
- 
- void nsGeolocationService::UpdateAccuracy(bool aForceHigh) {
-+  if (mIsOverride) {
-+    return;
-+  }
-+
-   bool highRequired = aForceHigh || HighAccuracyRequested();
- 
-   if (XRE_IsContentProcess()) {
-diff --git a/dom/geolocation/Geolocation.h b/dom/geolocation/Geolocation.h
-index 0e1d90608d55db6a3d39c730d40efa2e708a4c4a..5d49528d5925b4f9ab55531efd694f355bf5a42d 100644
---- a/dom/geolocation/Geolocation.h
-+++ b/dom/geolocation/Geolocation.h
-@@ -63,7 +63,7 @@ class nsGeolocationService final : public nsIGeolocationUpdate,
- 
-   nsGeolocationService() = default;
- 
--  nsresult Init();
-+  nsresult Init(bool isOverride = false);
- 
-   // Management of the Geolocation objects
-   void AddLocator(mozilla::dom::Geolocation* aLocator);
-@@ -88,6 +88,8 @@ class nsGeolocationService final : public nsIGeolocationUpdate,
-   void UpdateAccuracy(bool aForceHigh = false);
-   bool HighAccuracyRequested();
- 
-+  bool IsOverride();
-+
-  private:
-   ~nsGeolocationService();
- 
-@@ -114,6 +116,8 @@ class nsGeolocationService final : public nsIGeolocationUpdate,
-   // Nothing() if not being started, or a boolean reflecting the requested
-   // accuracy.
-   mozilla::Maybe<bool> mStarting;
-+
-+  bool mIsOverride = false;
- };
- 
- namespace mozilla::dom {
 diff --git a/dom/html/HTMLInputElement.cpp b/dom/html/HTMLInputElement.cpp
-index 45fa91a01ee24014c33396b4e057a797c72377b2..5e44eea99d06d2688e196ba1eb62eb1766b3cb70 100644
+index 1e697e9ced01c1ac64348fcf375821b405ad3e2a..a23d9ac19eabe70affbf79835d3612cdcfdb6727 100644
 --- a/dom/html/HTMLInputElement.cpp
 +++ b/dom/html/HTMLInputElement.cpp
 @@ -60,6 +60,7 @@
@@ -1477,10 +1428,10 @@ index 584d39da5f04f6d8fc6a87547557b0eeeb35d168..65eb7014356a90aa01ab517c9937ed65
     * returned quads are further translated relative to the window
     * origin -- which is not the layout origin. Further translation
 diff --git a/dom/webidl/Window.webidl b/dom/webidl/Window.webidl
-index ae2d14e105bc70dc4a5c7f1fa3481c550a74dd4d..83f090b0512dbf2fde42e152838d4bd8315e6616 100644
+index 87efe769a8e2d2f8d3502957127de50aed1e9971..b8545e4c788bbee7b1d53efff081289831abd1cf 100644
 --- a/dom/webidl/Window.webidl
 +++ b/dom/webidl/Window.webidl
-@@ -442,6 +442,8 @@ dictionary SynthesizeMouseEventOptions : SynthesizeEventOptions {
+@@ -444,6 +444,8 @@ dictionary SynthesizeMouseEventOptions : SynthesizeEventOptions {
    boolean ignoreRootScrollFrame = false;
    // Controls WidgetMouseEvent.mReason value.
    boolean isWidgetEventSynthesized = false;
@@ -1489,11 +1440,56 @@ index ae2d14e105bc70dc4a5c7f1fa3481c550a74dd4d..83f090b0512dbf2fde42e152838d4bd8
  };
  
  // Mozilla-specific stuff
+diff --git a/dom/workers/ScriptLoader.cpp b/dom/workers/ScriptLoader.cpp
+index 8c88d73aa9c65ea858e2e1a475f40a4e0dd7edd2..7058eb325322c4fe19704e9fe3aa30ad38e21340 100644
+--- a/dom/workers/ScriptLoader.cpp
++++ b/dom/workers/ScriptLoader.cpp
+@@ -1169,6 +1169,14 @@ bool WorkerScriptLoader::EvaluateScript(JSContext* aCx,
+   mWorkerRef->Private()->AssertIsOnWorkerThread();
+   MOZ_ASSERT(!IsDynamicImport(aRequest));
+ 
++  // ----- Playwright begin -----
++  ++mEvaluatingScriptCount;
++  auto decrementEvaluatingCount = MakeScopeExit([&] {
++    MOZ_ASSERT(mEvaluatingScriptCount > 0);
++    --mEvaluatingScriptCount;
++  });
++  // ----- Playwright end -------
++
+   WorkerLoadContext* loadContext = aRequest->GetWorkerLoadContext();
+ 
+   NS_ASSERTION(!loadContext->mChannel, "Should no longer have a channel!");
+diff --git a/dom/workers/ScriptLoader.h b/dom/workers/ScriptLoader.h
+index 6ea3f0a9ed4f1e31a36e9657010b694177bd79d3..496b805f198f266751f0cc9fc64035ba81be11cc 100644
+--- a/dom/workers/ScriptLoader.h
++++ b/dom/workers/ScriptLoader.h
+@@ -157,6 +157,10 @@ class WorkerScriptLoader : public JS::loader::ScriptLoaderInterface,
+   bool mExecutionAborted = false;
+   bool mMutedErrorFlag = false;
+ 
++  // ----- Playwright begin -----
++  uint32_t mEvaluatingScriptCount = 0;
++  // ----- Playwright end -------
++
+   // Count of loading module requests. mLoadingRequests doesn't keep track of
+   // child module requests.
+   // This member should be accessed on worker thread.
+@@ -228,7 +232,9 @@ class WorkerScriptLoader : public JS::loader::ScriptLoaderInterface,
+   bool ProcessPendingRequests(JSContext* aCx);
+ 
+   bool AllScriptsExecuted() {
+-    return mLoadingRequests.isEmpty() && mLoadedRequests.isEmpty();
++    // https://github.com/microsoft/playwright/issues/42565
++    return mEvaluatingScriptCount == 0 && mLoadingRequests.isEmpty() &&
++           mLoadedRequests.isEmpty();
+   }
+ 
+   bool IsDebuggerScript() const { return mWorkerScriptType == DebuggerScript; }
 diff --git a/js/src/debugger/Object.cpp b/js/src/debugger/Object.cpp
-index 57cd28a445025fb9f3a18ce7083ee683069015f0..398b82832bbf373d443b846b7b5cd4d10888d2a3 100644
+index 29e128ec723f557292f8ed0a2fc338503002f238..270ee326e169889ef5bb42dff4c3ac6eda6f0f01 100644
 --- a/js/src/debugger/Object.cpp
 +++ b/js/src/debugger/Object.cpp
-@@ -2510,7 +2510,11 @@ Maybe<Completion> DebuggerObject::call(JSContext* cx,
+@@ -2623,7 +2623,11 @@ Maybe<Completion> DebuggerObject::call(JSContext* cx,
          invokeArgs[i].set(args2[i]);
        }
  
@@ -1506,10 +1502,10 @@ index 57cd28a445025fb9f3a18ce7083ee683069015f0..398b82832bbf373d443b846b7b5cd4d1
    }
  
 diff --git a/js/src/vm/DateTime.cpp b/js/src/vm/DateTime.cpp
-index 50657afb4aaf2305b01b581ee09eb9ea712b2614..38384eea6216358b40e8440fa2a78a17fca83592 100644
+index 51d1d54ee7ed08739242913a607eac8d20655213..f5f9642ef3b4fe5c7c9b01ed88bb2666a1e20605 100644
 --- a/js/src/vm/DateTime.cpp
 +++ b/js/src/vm/DateTime.cpp
-@@ -810,7 +810,6 @@ void js::DateTimeInfo::internalResyncICUDefaultTimeZone() {
+@@ -809,7 +809,6 @@ void js::DateTimeInfo::internalResyncICUDefaultTimeZone() {
  #if JS_HAS_INTL_API
    if (const char* tzenv = std::getenv("TZ")) {
      std::string_view tz(tzenv);
@@ -1569,10 +1565,10 @@ index eaaf69687f669a4859a37f3f97b99e6ca519c420..6f965a110db3a1c86466d72f09ead23b
        // No boxes to return
        return;
 diff --git a/layout/base/PresShell.cpp b/layout/base/PresShell.cpp
-index 5b52c35994ce5167fc07b31ed9adb9b2ecc1df32..906f8c6e7a7736eed6ba149fd4a142b53522dbc9 100644
+index 0be20c4ea8b91424a98659d991038b1e5c7f1e4a..5f497118bf3c2e4e7405d82732b49acadce45a8a 100644
 --- a/layout/base/PresShell.cpp
 +++ b/layout/base/PresShell.cpp
-@@ -11835,7 +11835,9 @@ bool PresShell::ComputeActiveness() const {
+@@ -11948,7 +11948,9 @@ bool PresShell::ComputeActiveness() const {
      if (!browserChild->IsVisible()) {
        MOZ_LOG(gLog, LogLevel::Debug,
                (" > BrowserChild %p is not visible", browserChild));
@@ -1584,10 +1580,10 @@ index 5b52c35994ce5167fc07b31ed9adb9b2ecc1df32..906f8c6e7a7736eed6ba149fd4a142b5
  
      // If the browser is visible but just due to be preserving layers
 diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
-index aa6ef4435df02bad54e195607c5da02bd7ed315a..c7a3f02bf30704c53a3c6a619b2dfbee02edb0c2 100644
+index 22f2b63b9dc1a59bb6ca23f152faf42aa164f79c..17b22da2cce054b793780096fbfa10bb65b8afe8 100644
 --- a/layout/base/nsLayoutUtils.cpp
 +++ b/layout/base/nsLayoutUtils.cpp
-@@ -702,6 +702,7 @@ bool nsLayoutUtils::AllowZoomingForDocument(
+@@ -701,6 +701,7 @@ bool nsLayoutUtils::AllowZoomingForDocument(const Document* aDocument) {
        !aDocument->GetPresShell()->AsyncPanZoomEnabled()) {
      return false;
    }
@@ -1596,10 +1592,10 @@ index aa6ef4435df02bad54e195607c5da02bd7ed315a..c7a3f02bf30704c53a3c6a619b2dfbee
    // in RDM.
    BrowsingContext* bc = aDocument->GetBrowsingContext();
 diff --git a/layout/style/GeckoBindings.h b/layout/style/GeckoBindings.h
-index b8317e006298c1345a6f13d26ca20980875e5bd1..001fd4dbe5612588857924b902cf7ccb359885e5 100644
+index 574c2683cadf77b468ca9a4250bc7bc1fbb5c8f3..30c7a89a6ed08f526089a8ab40124a980fac3089 100644
 --- a/layout/style/GeckoBindings.h
 +++ b/layout/style/GeckoBindings.h
-@@ -623,6 +623,7 @@ bool Gecko_MediaFeatures_PrefersReducedMotion(const mozilla::dom::Document*);
+@@ -607,6 +607,7 @@ bool Gecko_MediaFeatures_PrefersReducedMotion(const mozilla::dom::Document*);
  bool Gecko_MediaFeatures_PrefersReducedTransparency(
      const mozilla::dom::Document*);
  bool Gecko_MediaFeatures_MacRTL(const mozilla::dom::Document*);
@@ -1633,10 +1629,10 @@ index 1f9613b8cd936fa9d884be010a8dd6167251faa6..0346bccc1c469446376c5bee3250e3dc
      return StylePrefersContrast::NoPreference;
    }
 diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
-index 3d33f9916a240af4ef5b0028b23e139dc50e9851..358b8365235dad23c08ad26d7d30cde3fd9b2bc8 100644
+index 1e0f2266c6ae3b00b44499031325a6689479069e..3e7e870cbc1884eedb41c776a9b46ab55f9a3f07 100644
 --- a/modules/libpref/init/StaticPrefList.yaml
 +++ b/modules/libpref/init/StaticPrefList.yaml
-@@ -13315,18 +13315,20 @@
+@@ -13496,18 +13496,20 @@
  # Use the libwebrtc ScreenCaptureKit desktop capture backend on Mac by default.
  # When disabled, or on a host where not supported (< macOS 14), the older
  # CoreGraphics backend is used instead.
@@ -1660,10 +1656,10 @@ index 3d33f9916a240af4ef5b0028b23e139dc50e9851..358b8365235dad23c08ad26d7d30cde3
  
  # Use the libwebrtc ScreenCaptureKit desktop capture backend on Mac for screen
 diff --git a/netwerk/base/LoadInfo.cpp b/netwerk/base/LoadInfo.cpp
-index a468108e7147e98f1037e751cb25bc5743a276c3..6b9fab4b6a07cdb9a54719bd7007e32368c485f6 100644
+index b37ab1f707c00065f4c7a688c3bf590bbfcd815b..cb888c7663a603744610a02e3e8cd4d680623c12 100644
 --- a/netwerk/base/LoadInfo.cpp
 +++ b/netwerk/base/LoadInfo.cpp
-@@ -752,7 +752,8 @@ LoadInfo::LoadInfo(const LoadInfo& rhs)
+@@ -753,7 +753,8 @@ LoadInfo::LoadInfo(const LoadInfo& rhs)
        mInterceptionInfo(rhs.mInterceptionInfo),
        mSchemelessInput(rhs.mSchemelessInput),
        mUserNavigationInvolvement(rhs.mUserNavigationInvolvement),
@@ -1673,7 +1669,7 @@ index a468108e7147e98f1037e751cb25bc5743a276c3..6b9fab4b6a07cdb9a54719bd7007e323
  }
  
  LoadInfo::LoadInfo(
-@@ -2116,4 +2117,16 @@ void LoadInfo::UpdateParentAddressSpaceInfo() {
+@@ -2117,4 +2118,16 @@ void LoadInfo::UpdateParentAddressSpaceInfo() {
    }
  }
  
@@ -1691,10 +1687,10 @@ index a468108e7147e98f1037e751cb25bc5743a276c3..6b9fab4b6a07cdb9a54719bd7007e323
 +
  }  // namespace mozilla::net
 diff --git a/netwerk/base/LoadInfo.h b/netwerk/base/LoadInfo.h
-index 797517e695981ddddfef253cd5eb227fd08e686d..93927bb84e4a81068b1772a913c4b405605cc063 100644
+index 837efb44f66e2cbe39e563a44a2807e55bab9312..97bd9e9be52510192e260580a6b5638af97a8d5b 100644
 --- a/netwerk/base/LoadInfo.h
 +++ b/netwerk/base/LoadInfo.h
-@@ -550,6 +550,8 @@ class LoadInfo final : public nsILoadInfo {
+@@ -542,6 +542,8 @@ class LoadInfo final : public nsILoadInfo {
        dom::UserNavigationInvolvement::None;
  
    bool mSkipHTTPSUpgrade = false;
@@ -1704,10 +1700,10 @@ index 797517e695981ddddfef253cd5eb227fd08e686d..93927bb84e4a81068b1772a913c4b405
  // This is exposed solely for testing purposes and should not be used outside of
  // LoadInfo
 diff --git a/netwerk/base/TRRLoadInfo.cpp b/netwerk/base/TRRLoadInfo.cpp
-index 8acc7468ae67a75c53569c8d9498b0b27d6bcaa2..5cf23f8a3906f923c0368e8cf5b8fc99df4858f5 100644
+index 9a4cf0648708633b6b826312b262df9d3b6c163f..574aceb5700b47325ef9ceafeab647b2d166a609 100644
 --- a/netwerk/base/TRRLoadInfo.cpp
 +++ b/netwerk/base/TRRLoadInfo.cpp
-@@ -555,5 +555,15 @@ TRRLoadInfo::GetFetchDestination(nsACString& aDestination) {
+@@ -556,5 +556,15 @@ TRRLoadInfo::GetFetchDestination(nsACString& aDestination) {
    return NS_ERROR_NOT_IMPLEMENTED;
  }
  
@@ -1724,10 +1720,10 @@ index 8acc7468ae67a75c53569c8d9498b0b27d6bcaa2..5cf23f8a3906f923c0368e8cf5b8fc99
  }  // namespace net
  }  // namespace mozilla
 diff --git a/netwerk/base/nsILoadInfo.idl b/netwerk/base/nsILoadInfo.idl
-index f6a22a498d99ee75c7c9985e278b4331ec3eddc4..cbc8f92fabc7272a2f04b0e37214e7a51a9a0dda 100644
+index f5e892979d77d608fb499f963872076f7d122f76..f48a0d48d880453bb882d97114482dba2bf6bdbf 100644
 --- a/netwerk/base/nsILoadInfo.idl
 +++ b/netwerk/base/nsILoadInfo.idl
-@@ -1720,4 +1720,6 @@ interface nsILoadInfo : nsISupports
+@@ -1704,4 +1704,6 @@ interface nsILoadInfo : nsISupports
        return static_cast<mozilla::dom::UserNavigationInvolvement>(userNavigationInvolvement);
      }
  %}
@@ -1756,10 +1752,10 @@ index 3654f3ed20f6b22d36c4238be40417e77e8f6867..f685e7668ad3310cac8bc8425124a6fe
       * Set the status and reason for the forthcoming synthesized response.
       * Multiple calls overwrite existing values.
 diff --git a/netwerk/ipc/DocumentLoadListener.cpp b/netwerk/ipc/DocumentLoadListener.cpp
-index 1df2115be38c8e4c71635581f486c0efb0a48d2d..6a8e39d7b3504b05b463ba218b038455ff52bf2a 100644
+index 090ea90b4dbfcb47b3029142ceb9aaae04df3374..f0d161f4519841a85b38a34bb2c4c6fce893f4cc 100644
 --- a/netwerk/ipc/DocumentLoadListener.cpp
 +++ b/netwerk/ipc/DocumentLoadListener.cpp
-@@ -196,6 +196,7 @@ static auto CreateDocumentLoadInfo(CanonicalBrowsingContext* aBrowsingContext,
+@@ -205,6 +205,7 @@ static auto CreateDocumentLoadInfo(CanonicalBrowsingContext* aBrowsingContext,
        aLoadState->GetTextDirectiveUserActivation() ||
        aLoadState->HasLoadFlags(nsIWebNavigation::LOAD_FLAGS_FROM_EXTERNAL));
    loadInfo->SetIsMetaRefresh(aLoadState->IsMetaRefresh());
@@ -1768,10 +1764,10 @@ index 1df2115be38c8e4c71635581f486c0efb0a48d2d..6a8e39d7b3504b05b463ba218b038455
    return loadInfo.forget();
  }
 diff --git a/netwerk/protocol/http/InterceptedHttpChannel.cpp b/netwerk/protocol/http/InterceptedHttpChannel.cpp
-index 60626cc9b3f7495b3f0ffc13346d1319ffd86dab..99c85a483d9e325bc3f7fd86bf772968ece31724 100644
+index f094d87b789e0a9e1984aaf30718bff64f24ef94..d1f7fdaff06e62a7e96bd5c9dc6ea39d2ea593a5 100644
 --- a/netwerk/protocol/http/InterceptedHttpChannel.cpp
 +++ b/netwerk/protocol/http/InterceptedHttpChannel.cpp
-@@ -726,10 +726,33 @@ NS_IMPL_ISUPPORTS(ResetInterceptionHeaderVisitor, nsIHttpHeaderVisitor)
+@@ -727,10 +727,33 @@ NS_IMPL_ISUPPORTS(ResetInterceptionHeaderVisitor, nsIHttpHeaderVisitor)
  
  }  // anonymous namespace
  
@@ -1805,7 +1801,7 @@ index 60626cc9b3f7495b3f0ffc13346d1319ffd86dab..99c85a483d9e325bc3f7fd86bf772968
    if (mCanceled) {
      return mStatus;
    }
-@@ -1143,11 +1166,18 @@ InterceptedHttpChannel::OnStartRequest(nsIRequest* aRequest) {
+@@ -1148,11 +1171,18 @@ InterceptedHttpChannel::OnStartRequest(nsIRequest* aRequest) {
      GetCallback(mProgressSink);
    }
  
@@ -1825,7 +1821,7 @@ index 60626cc9b3f7495b3f0ffc13346d1319ffd86dab..99c85a483d9e325bc3f7fd86bf772968
    if (mPump && mLoadFlags & LOAD_CALL_CONTENT_SNIFFERS) {
      RefPtr<nsInputStreamPump> pump(mPump);
 diff --git a/netwerk/protocol/http/InterceptedHttpChannel.h b/netwerk/protocol/http/InterceptedHttpChannel.h
-index 430646881b927d2dddda1e0bcf5fd3427580224f..6b5bbb2a411794e9275d1ab83ea02d4cfca88e0e 100644
+index ab440756a6745ce3c4785f211db32173c6bd27c5..2ba8db70059b5143e72063ffb588c55dd2734c62 100644
 --- a/netwerk/protocol/http/InterceptedHttpChannel.h
 +++ b/netwerk/protocol/http/InterceptedHttpChannel.h
 @@ -89,6 +89,11 @@ class InterceptedHttpChannel final
@@ -1841,7 +1837,7 @@ index 430646881b927d2dddda1e0bcf5fd3427580224f..6b5bbb2a411794e9275d1ab83ea02d4c
     *  InterceptionTimeStamps is used to record the time stamps of the
     *  interception.
 diff --git a/netwerk/protocol/http/nsHttpChannel.cpp b/netwerk/protocol/http/nsHttpChannel.cpp
-index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a99d3b2ba 100644
+index 0941cf9dc3933cd0c0e85647fd9531e18a3bcffb..10298f22fe713638b1c96f587b7d7be844f276e4 100644
 --- a/netwerk/protocol/http/nsHttpChannel.cpp
 +++ b/netwerk/protocol/http/nsHttpChannel.cpp
 @@ -942,11 +942,9 @@ nsresult nsHttpChannel::OnBeforeConnect() {
@@ -1868,7 +1864,7 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
  
    if (mURI->SchemeIs("https") || aShouldUpgrade || !LoadUseHTTPSSVC() ||
        forceOffline) {
-@@ -1531,15 +1527,14 @@ nsresult nsHttpChannel::ContinueConnect() {
+@@ -1541,15 +1537,14 @@ nsresult nsHttpChannel::ContinueConnect() {
                       "CORS preflight must have been finished by the time we "
                       "do the rest of ContinueConnect");
  
@@ -1886,7 +1882,7 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
            BYPASS_LOCAL_CACHE(mLoadFlags, LoadPreferCacheLoadOverBypass())) {
          return NS_ERROR_OFFLINE;
        }
-@@ -1581,7 +1576,7 @@ nsresult nsHttpChannel::ContinueConnect() {
+@@ -1591,7 +1586,7 @@ nsresult nsHttpChannel::ContinueConnect() {
    }
  
    // We're about to hit the network. Don't if we're forced offline.
@@ -1895,7 +1891,7 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
      return NS_ERROR_OFFLINE;
    }
  
-@@ -1689,12 +1684,9 @@ void nsHttpChannel::SpeculativeConnect() {
+@@ -1699,12 +1694,9 @@ void nsHttpChannel::SpeculativeConnect() {
    // don't speculate if we are offline, when doing http upgrade (i.e.
    // websockets bootstrap), or if we can't do keep-alive (because then we
    // couldn't reuse the speculative connection anyhow).
@@ -1909,7 +1905,7 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
      return;
    }
  
-@@ -5007,7 +4999,7 @@ nsresult nsHttpChannel::OpenCacheEntryInternal(bool isHttps) {
+@@ -5060,7 +5052,7 @@ nsresult nsHttpChannel::OpenCacheEntryInternal(bool isHttps) {
      return NS_OK;
    }
  
@@ -1918,7 +1914,7 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
    if (offline || (mLoadFlags & INHIBIT_CACHING) || forceOffline) {
      if (BYPASS_LOCAL_CACHE(mLoadFlags, LoadPreferCacheLoadOverBypass()) &&
          !offline && !forceOffline) {
-@@ -8306,6 +8298,20 @@ void nsHttpChannel::MaybeStartDNSPrefetch() {
+@@ -8534,6 +8526,20 @@ void nsHttpChannel::MaybeStartDNSPrefetch() {
    }
  }
  
@@ -1940,10 +1936,10 @@ index c6d926448e399e0cb3032180efad3cddaf785fc0..7148ba816bf0dab3224323736001237a
  nsHttpChannel::GetEncodedBodySize(uint64_t* aEncodedBodySize) {
    if (mCacheEntry && !LoadCacheEntryIsWriteOnly()) {
 diff --git a/netwerk/protocol/http/nsHttpChannel.h b/netwerk/protocol/http/nsHttpChannel.h
-index 602a3def6eab873986afc17ec92073eb476a43fb..4b267ff4859ebc3eecb169b7f793e60ac8ba1728 100644
+index cb5da1a630eb49624078262917d34146c6367444..b826374a2d0dc2814b2fd85efaed941ec63edb54 100644
 --- a/netwerk/protocol/http/nsHttpChannel.h
 +++ b/netwerk/protocol/http/nsHttpChannel.h
-@@ -306,6 +306,10 @@ class nsHttpChannel final : public HttpBaseChannel,
+@@ -317,6 +317,10 @@ class nsHttpChannel final : public HttpBaseChannel,
    void MaybeResolveProxyAndBeginConnect();
    void MaybeStartDNSPrefetch();
  
@@ -1955,10 +1951,10 @@ index 602a3def6eab873986afc17ec92073eb476a43fb..4b267ff4859ebc3eecb169b7f793e60a
    // end server host name.
    nsIHttpChannelInternal::ProxyDNSStrategy ComputeProxyDNSStrategy();
 diff --git a/parser/html/nsHtml5TreeOpExecutor.cpp b/parser/html/nsHtml5TreeOpExecutor.cpp
-index ed63fe936c1c0fa38329c19c7adada56fd756f2d..b492aa20dd7ded36472b3816ea181d9a991b8d6f 100644
+index 8c376eb269cc152bebf4ddb24fee9bda26d4bac8..e52a4768d92c254f07196c903ee9355f464c91b1 100644
 --- a/parser/html/nsHtml5TreeOpExecutor.cpp
 +++ b/parser/html/nsHtml5TreeOpExecutor.cpp
-@@ -1449,6 +1449,10 @@ void nsHtml5TreeOpExecutor::UpdateReferrerInfoFromMeta(
+@@ -1450,6 +1450,10 @@ void nsHtml5TreeOpExecutor::UpdateReferrerInfoFromMeta(
  void nsHtml5TreeOpExecutor::AddSpeculationCSP(const nsAString& aCSP) {
    NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
  
@@ -1970,10 +1966,10 @@ index ed63fe936c1c0fa38329c19c7adada56fd756f2d..b492aa20dd7ded36472b3816ea181d9a
    nsCOMPtr<nsIContentSecurityPolicy> preloadCsp = mDocument->GetPreloadCsp();
    if (!preloadCsp) {
 diff --git a/security/manager/ssl/nsCertOverrideService.cpp b/security/manager/ssl/nsCertOverrideService.cpp
-index 068d9702fd015c974d698d2c8c741b5d2b0d8316..9ff49d6de9d712b7e5ab9711da7f22269dc2fe49 100644
+index 79a5989f6949505878cfbee21e6609cf2cdbaf37..fb2c56c9bb8047468773c421d3ccca37b873c035 100644
 --- a/security/manager/ssl/nsCertOverrideService.cpp
 +++ b/security/manager/ssl/nsCertOverrideService.cpp
-@@ -624,6 +624,8 @@ void nsCertOverrideService::CountPermanentOverrideTelemetry(
+@@ -615,6 +615,8 @@ void nsCertOverrideService::CountPermanentOverrideTelemetry(
  }
  
  static bool IsDebugger() {
@@ -1983,10 +1979,10 @@ index 068d9702fd015c974d698d2c8c741b5d2b0d8316..9ff49d6de9d712b7e5ab9711da7f2226
    nsCOMPtr<nsIMarionette> marionette = do_GetService(NS_MARIONETTE_CONTRACTID);
    if (marionette) {
 diff --git a/services/settings/Utils.sys.mjs b/services/settings/Utils.sys.mjs
-index 76f69ab74eba9f704b95a7e3c7b27c39a887bf5a..cf0b9223baed50bff6a08497fe571ca153efaeb0 100644
+index 40e919a997a5e112ec9a83aa72680451d4739367..e0d91833af2392adc236f069a60808615ffb8287 100644
 --- a/services/settings/Utils.sys.mjs
 +++ b/services/settings/Utils.sys.mjs
-@@ -99,7 +99,7 @@ const _cdnURLs = {};
+@@ -105,7 +105,7 @@ function _isUndefined(value) {
  
  export var Utils = {
    get SERVER_URL() {
@@ -1995,7 +1991,7 @@ index 76f69ab74eba9f704b95a7e3c7b27c39a887bf5a..cf0b9223baed50bff6a08497fe571ca1
        ? // eslint-disable-next-line mozilla/valid-lazy
          lazy.gServerURL
        : AppConstants.REMOTE_SETTINGS_SERVER_URLS[0];
-@@ -113,6 +113,9 @@ export var Utils = {
+@@ -119,6 +119,9 @@ export var Utils = {
    log,
  
    get shouldSkipRemoteActivity() {
@@ -2006,35 +2002,37 @@ index 76f69ab74eba9f704b95a7e3c7b27c39a887bf5a..cf0b9223baed50bff6a08497fe571ca1
        (lazy.isRunningTests || Cu.isInAutomation) &&
        this.SERVER_URL == "data:,#remote-settings-dummy/v1"
 diff --git a/toolkit/components/browser/nsIWebBrowserChrome.idl b/toolkit/components/browser/nsIWebBrowserChrome.idl
-index a665bd039d49aeeb6896e224080a7cc00b0eacbc..099c3b08d7de697cc8edcd5bb1d8000fc28aeefb 100644
+index 11f7f8a614bd9dc99ec23dec1d7b45527331bec0..e222d1be610db5e00ca7380c4f35259caaced091 100644
 --- a/toolkit/components/browser/nsIWebBrowserChrome.idl
 +++ b/toolkit/components/browser/nsIWebBrowserChrome.idl
-@@ -87,6 +87,9 @@ interface nsIWebBrowserChrome : nsISupports
-     // Whether this is a Document Picture-in-Picture window
-     const unsigned long CHROME_DOCUMENT_PIP           = 1 << 22;
- 
-+    // Whether this window has "width" or "height" defined in features
-+    const unsigned long JUGGLER_WINDOW_EXPLICIT_SIZE  = 1 << 23;
-+
-     // Prevents new window animations on MacOS and Windows. Currently
+@@ -99,7 +99,10 @@ interface nsIWebBrowserChrome : nsISupports
      // ignored for Linux.
      const unsigned long CHROME_SUPPRESS_ANIMATION     = 1 << 24;
+ 
+-    // Two bits are free here.
++    // Whether this window has "width" or "height" defined in features
++    const unsigned long JUGGLER_WINDOW_EXPLICIT_SIZE  = 1 << 26;
++
++    // One bit is free here.
+ 
+     const unsigned long CHROME_CENTER_SCREEN          = 1 << 27;
+ 
 diff --git a/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.sys.mjs b/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.sys.mjs
-index 217d51f4c765e0aac2107246f7142099d21d984e..1b623f956c178904945cddeceec9f737a01c053f 100644
+index 7c5bde49c469a6645e4694bc523dab24302694ba..812311051343beb44883e48d8670545c5beb8d71 100644
 --- a/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.sys.mjs
 +++ b/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.sys.mjs
-@@ -115,7 +115,9 @@ EnterprisePoliciesManager.prototype = {
+@@ -113,7 +113,9 @@ EnterprisePoliciesManager.prototype = {
        Services.prefs.clearUserPref(PREF_POLICIES_APPLIED);
      }
  
--    let provider = this._chooseProvider();
+-    let provider = this._buildProvider();
 +    // --- Playwright begin ---
 +    let provider = new PlaywrightPoliciesProvider();
 +    // --- Playwright end ---
  
      if (provider.failed) {
        this.status = Ci.nsIEnterprisePolicies.FAILED;
-@@ -736,6 +738,19 @@ class JSONPoliciesProvider {
+@@ -760,6 +762,19 @@ class JSONPoliciesProvider extends PoliciesProvider {
    }
  }
  
@@ -2051,11 +2049,74 @@ index 217d51f4c765e0aac2107246f7142099d21d984e..1b623f956c178904945cddeceec9f737
 +  }
 +}
 +
- class WindowsGPOPoliciesProvider {
+ class WindowsGPOPoliciesProvider extends PoliciesProvider {
    constructor() {
-     this._policies = null;
+     super();
+diff --git a/toolkit/components/geolocation/GeolocationService.cpp b/toolkit/components/geolocation/GeolocationService.cpp
+index 70af7ec0c23833766fdee173c1bcf35448e3af85..1e587ebb60f4591402566f6749426d296d0992b9 100644
+--- a/toolkit/components/geolocation/GeolocationService.cpp
++++ b/toolkit/components/geolocation/GeolocationService.cpp
+@@ -52,11 +52,16 @@ NS_INTERFACE_MAP_END
+ NS_IMPL_ADDREF(GeolocationService)
+ NS_IMPL_RELEASE(GeolocationService)
+ 
+-nsresult GeolocationService::Init() {
++nsresult GeolocationService::Init(bool aIsOverride) {
+   if (!StaticPrefs::geo_enabled()) {
+     return NS_ERROR_FAILURE;
+   }
+ 
++  if (aIsOverride) {
++    mIsOverride = true;
++    mHigherAccuracy = true;
++  }
++
+   if (XRE_IsContentProcess()) {
+     return NS_OK;
+   }
+@@ -277,6 +282,10 @@ bool GeolocationService::HighAccuracyRequested() {
+ }
+ 
+ void GeolocationService::UpdateAccuracy(bool aForceHigh) {
++  if (mIsOverride) {
++    return;
++  }
++
+   bool highRequired = aForceHigh || HighAccuracyRequested();
+ 
+   if (XRE_IsContentProcess()) {
+diff --git a/toolkit/components/geolocation/GeolocationService.h b/toolkit/components/geolocation/GeolocationService.h
+index ab90326ccabc727b72ac3b2b43ee354ef18e20a2..17ff228f0037687cf68c3c55ab56ab2b3d686d0c 100644
+--- a/toolkit/components/geolocation/GeolocationService.h
++++ b/toolkit/components/geolocation/GeolocationService.h
+@@ -42,7 +42,7 @@ class GeolocationService final : public nsIGeolocationService,
+ 
+   GeolocationService() = default;
+ 
+-  nsresult Init();
++  nsresult Init(bool aIsOverride = false);
+ 
+   // Management of the Geolocation objects
+   void AddLocator(mozilla::dom::Geolocation* aLocator);
+@@ -66,6 +66,7 @@ class GeolocationService final : public nsIGeolocationService,
+   // Update the accuracy and notify the provider if changed
+   void UpdateAccuracy(bool aForceHigh = false);
+   bool HighAccuracyRequested();
++  bool IsOverride() const { return mIsOverride; }
+ 
+  private:
+   ~GeolocationService();
+@@ -93,6 +94,8 @@ class GeolocationService final : public nsIGeolocationService,
+   // Nothing() if not being started, or a boolean reflecting the requested
+   // accuracy.
+   mozilla::Maybe<bool> mStarting;
++
++  bool mIsOverride = false;
+ };
+ 
+ }  // namespace mozilla
 diff --git a/toolkit/components/startup/nsAppStartup.cpp b/toolkit/components/startup/nsAppStartup.cpp
-index d0f9c88dcdaca07c6e10139b50b092bf80fc8c3e..f6d1a5ff8f241abdd931f47508d0fffaadce0391 100644
+index b0f1e285ad6b89cf72c8a98fb564d474f5601c4e..52a080d8c16c8531aadf8714b30a31ef60537c46 100644
 --- a/toolkit/components/startup/nsAppStartup.cpp
 +++ b/toolkit/components/startup/nsAppStartup.cpp
 @@ -377,7 +377,7 @@ nsAppStartup::Quit(uint32_t aMode, int aExitCode, bool* aUserAllowedQuit) {
@@ -2083,24 +2144,28 @@ index efe8ff5541915c0fc632e75572d1e3968c60139d..e0157515ded811e47d21705f13f475d6
                                          int32_t aMaxSelfProgress,
                                          int32_t aCurTotalProgress,
 diff --git a/toolkit/components/windowwatcher/nsWindowWatcher.cpp b/toolkit/components/windowwatcher/nsWindowWatcher.cpp
-index d5ebdf4413568c89e93d89279510ae910bcdf9fd..a1dbe7916e39fd6bc0292d6262787d39a5c8015d 100644
+index d493fc20e19390e94e5609556f1c6878ee3f66d5..1df133fa362d6d1eb3cb35780403150138626aed 100644
 --- a/toolkit/components/windowwatcher/nsWindowWatcher.cpp
 +++ b/toolkit/components/windowwatcher/nsWindowWatcher.cpp
-@@ -1917,7 +1917,11 @@ uint32_t nsWindowWatcher::CalculateChromeFlagsForContent(
-   // behavior of other browsers and avoids breaking sites like Gmail that
-   // open a Compose popout via Shift+click.
-   *aIsPopupRequested = true;
--  return nsIWebBrowserChrome::CHROME_MINIMAL_POPUP;
-+  uint32_t chromeFlags = 0;
+@@ -1902,8 +1902,14 @@ uint32_t nsWindowWatcher::CalculateChromeFlagsForContent(
+     return nsIWebBrowserChrome::CHROME_DOCUMENT_PICTURE_IN_PICTURE_FLAGS;
+   }
+   *aIsPopupRequested = ShouldOpenPopup(aFeatures);
+-  return *aIsPopupRequested ? nsIWebBrowserChrome::CHROME_MINIMAL_POPUP
+-                            : nsIWebBrowserChrome::CHROME_ALL;
++  if (!*aIsPopupRequested) {
++    return nsIWebBrowserChrome::CHROME_ALL;
++  }
++  uint32_t chromeFlags = nsIWebBrowserChrome::CHROME_MINIMAL_POPUP;
 +  if (aFeatures.Exists("width") || aFeatures.Exists("height")) {
 +    chromeFlags |= nsIWebBrowserChrome::JUGGLER_WINDOW_EXPLICIT_SIZE;
 +  }
-+  return chromeFlags | nsIWebBrowserChrome::CHROME_MINIMAL_POPUP;
++  return chromeFlags;
  }
  
  /**
 diff --git a/toolkit/mozapps/update/UpdateService.sys.mjs b/toolkit/mozapps/update/UpdateService.sys.mjs
-index db167b74f040cdb477f68c87c4dfe50ef1173c32..78690b35f701df5a683ea3e392b2f7757f66c73e 100644
+index 266f3ea153d578c20a8d96b3e0a0a319baab7468..9a2e98c5deb895fcacdd68bb1eaba39da22c4303 100644
 --- a/toolkit/mozapps/update/UpdateService.sys.mjs
 +++ b/toolkit/mozapps/update/UpdateService.sys.mjs
 @@ -4024,6 +4024,8 @@ export class UpdateService {
@@ -2177,10 +2242,10 @@ index 524451a83e03f8a9a83103b1f3d87850ad411515..a44b3c5da20f6a0bf9c892d4289a07ac
                // nsDocumentViewer::LoadComplete that doesn't do various things
                // that are not relevant here because this wasn't an actual
 diff --git a/uriloader/exthandler/nsExternalHelperAppService.cpp b/uriloader/exthandler/nsExternalHelperAppService.cpp
-index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3e7e62808 100644
+index 566509f9ef17ac0a1d9830a5315b751266db6aee..fc659b901334b0ff63ad244bcbff779415bd3813 100644
 --- a/uriloader/exthandler/nsExternalHelperAppService.cpp
 +++ b/uriloader/exthandler/nsExternalHelperAppService.cpp
-@@ -111,6 +111,7 @@
+@@ -115,6 +115,7 @@
  
  #include "mozilla/Components.h"
  #include "mozilla/ClearOnShutdown.h"
@@ -2188,7 +2253,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
  #include "mozilla/Preferences.h"
  #include "mozilla/ipc/URIUtils.h"
  
-@@ -879,6 +880,12 @@ NS_IMETHODIMP nsExternalHelperAppService::ApplyDecodingForExtension(
+@@ -890,6 +891,12 @@ NS_IMETHODIMP nsExternalHelperAppService::ApplyDecodingForExtension(
    return NS_OK;
  }
  
@@ -2201,7 +2266,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
  nsresult nsExternalHelperAppService::GetFileTokenForPath(
      const char16_t* aPlatformAppPath, nsIFile** aFile) {
    nsDependentString platformAppPath(aPlatformAppPath);
-@@ -1514,7 +1521,12 @@ nsresult nsExternalAppHandler::SetUpTempFile(nsIChannel* aChannel) {
+@@ -1568,7 +1575,12 @@ nsresult nsExternalAppHandler::SetUpTempFile(nsIChannel* aChannel) {
    // Strip off the ".part" from mTempLeafName
    mTempLeafName.Truncate(mTempLeafName.Length() - std::size(".part") + 1);
  
@@ -2214,7 +2279,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
    mSaver =
        do_CreateInstance(NS_BACKGROUNDFILESAVERSTREAMLISTENER_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
-@@ -1698,7 +1710,36 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
+@@ -1752,7 +1764,36 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
      return NS_OK;
    }
  
@@ -2252,7 +2317,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
    if (NS_FAILED(rv)) {
      nsresult transferError = rv;
  
-@@ -1760,6 +1801,9 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
+@@ -1814,6 +1855,9 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
  
    bool alwaysAsk = true;
    mMimeInfo->GetAlwaysAskBeforeHandling(&alwaysAsk);
@@ -2262,7 +2327,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
    if (alwaysAsk) {
      // But we *don't* ask if this mimeInfo didn't come from
      // our user configuration datastore and the user has said
-@@ -2276,6 +2320,15 @@ nsExternalAppHandler::OnSaveComplete(nsIBackgroundFileSaver* aSaver,
+@@ -2330,6 +2374,15 @@ nsExternalAppHandler::OnSaveComplete(nsIBackgroundFileSaver* aSaver,
      NotifyTransfer(aStatus);
    }
  
@@ -2278,7 +2343,7 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
    return NS_OK;
  }
  
-@@ -2761,6 +2814,14 @@ NS_IMETHODIMP nsExternalAppHandler::Cancel(nsresult aReason) {
+@@ -2815,6 +2868,14 @@ NS_IMETHODIMP nsExternalAppHandler::Cancel(nsresult aReason) {
      }
    }
  
@@ -2294,10 +2359,10 @@ index 1eab401455890aafc73f1da9080415fc035f1c30..d7ce1bccb117cac5d95181f6ab0ca7c3
    // OnStartRequest)
    mDialog = nullptr;
 diff --git a/uriloader/exthandler/nsExternalHelperAppService.h b/uriloader/exthandler/nsExternalHelperAppService.h
-index 3f8586ed7ee54af197a82b7a69651b4be2f84dad..929fe5b2b58ceef4055415cfc36a6698b73cba4c 100644
+index 477afd0a414b35af6b4acc13fa0321d826ae7d65..f2941eff522c0a06bb99759da375637c1196dfec 100644
 --- a/uriloader/exthandler/nsExternalHelperAppService.h
 +++ b/uriloader/exthandler/nsExternalHelperAppService.h
-@@ -269,6 +269,8 @@ class nsExternalHelperAppService : public nsIExternalHelperAppService,
+@@ -302,6 +302,8 @@ class nsExternalHelperAppService : public nsIExternalHelperAppService,
        mozilla::dom::BrowsingContext* aContentContext, bool aForceSave,
        nsIInterfaceRequestor* aWindowContext,
        nsIStreamListener** aStreamListener);
@@ -2306,7 +2371,7 @@ index 3f8586ed7ee54af197a82b7a69651b4be2f84dad..929fe5b2b58ceef4055415cfc36a6698
  };
  
  /**
-@@ -467,6 +469,9 @@ class nsExternalAppHandler final : public nsIStreamListener,
+@@ -500,6 +502,9 @@ class nsExternalAppHandler final : public nsIStreamListener,
     * Upon successful return, both mTempFile and mSaver will be valid.
     */
    nsresult SetUpTempFile(nsIChannel* aChannel);
@@ -2390,10 +2455,10 @@ index 777157e17e0db442262b1a9522b0b1b39058789a..54c4dde2ee4847e79b07fffe3ec57a34
  }
  #endif
 diff --git a/widget/cocoa/NativeKeyBindings.mm b/widget/cocoa/NativeKeyBindings.mm
-index 9711cfaf4e3e2974567ea7f7d4074b3541b0248f..34292be04676193f1b8efce45d4fa370c15e970f 100644
+index 4246b5ab669ecad8d2c24777c67470d1ece91d50..9b173d81b571d4aa25a57ca424e0ec6396ab5441 100644
 --- a/widget/cocoa/NativeKeyBindings.mm
 +++ b/widget/cocoa/NativeKeyBindings.mm
-@@ -618,6 +618,10 @@
+@@ -635,6 +635,10 @@
        break;
      case KEY_NAME_INDEX_ArrowUp:
        if (aEvent.IsControl()) {
@@ -2404,7 +2469,7 @@ index 9711cfaf4e3e2974567ea7f7d4074b3541b0248f..34292be04676193f1b8efce45d4fa370
          break;
        }
        if (aEvent.IsMeta()) {
-@@ -655,6 +659,10 @@
+@@ -672,6 +676,10 @@
        break;
      case KEY_NAME_INDEX_ArrowDown:
        if (aEvent.IsControl()) {
@@ -2416,7 +2481,7 @@ index 9711cfaf4e3e2974567ea7f7d4074b3541b0248f..34292be04676193f1b8efce45d4fa370
        }
        if (aEvent.IsMeta()) {
 diff --git a/widget/headless/HeadlessCompositorWidget.cpp b/widget/headless/HeadlessCompositorWidget.cpp
-index cbaa021c9d31cd57e253afd984c5076acab1941e..6cf72e6006e33eac7720958f7d0cd91983f2d782 100644
+index 8484851f674aa21d09e5a3ed77b9df4edaa89e12..2804831ec785a64c771946f095f855d9408851fe 100644
 --- a/widget/headless/HeadlessCompositorWidget.cpp
 +++ b/widget/headless/HeadlessCompositorWidget.cpp
 @@ -2,6 +2,8 @@
@@ -2425,10 +2490,10 @@ index cbaa021c9d31cd57e253afd984c5076acab1941e..6cf72e6006e33eac7720958f7d0cd919
  
 +#include "mozilla/gfx/2D.h"
 +#include "mozilla/layers/CompositorThread.h"
- #include "mozilla/widget/PlatformWidgetTypes.h"
  #include "HeadlessCompositorWidget.h"
+ 
  #include "VsyncDispatcher.h"
-@@ -14,9 +16,30 @@ HeadlessCompositorWidget::HeadlessCompositorWidget(
+@@ -15,9 +17,30 @@ HeadlessCompositorWidget::HeadlessCompositorWidget(
      const layers::CompositorOptions& aOptions, HeadlessWidget* aWindow)
      : CompositorWidget(aOptions),
        mWidget(aWindow),
@@ -2459,7 +2524,7 @@ index cbaa021c9d31cd57e253afd984c5076acab1941e..6cf72e6006e33eac7720958f7d0cd919
  void HeadlessCompositorWidget::ObserveVsync(VsyncObserver* aObserver) {
    if (RefPtr<CompositorVsyncDispatcher> cvd =
            mWidget->GetCompositorVsyncDispatcher()) {
-@@ -30,6 +53,59 @@ void HeadlessCompositorWidget::NotifyClientSizeChanged(
+@@ -31,6 +54,59 @@ void HeadlessCompositorWidget::NotifyClientSizeChanged(
      const LayoutDeviceIntSize& aClientSize) {
    auto size = mClientSize.Lock();
    *size = aClientSize;
@@ -2520,7 +2585,7 @@ index cbaa021c9d31cd57e253afd984c5076acab1941e..6cf72e6006e33eac7720958f7d0cd919
  
  LayoutDeviceIntSize HeadlessCompositorWidget::GetClientSize() {
 diff --git a/widget/headless/HeadlessCompositorWidget.h b/widget/headless/HeadlessCompositorWidget.h
-index 8374cd00944eddad27563624cd33bb046b6cf143..0345d19d1da862ccd31afa49b123e9f16755c886 100644
+index f9454a79f3e3ff4d9013db99cf9bb98413633330..68e7b94c3a9c75dc9fceae0d5881971497e4fc7c 100644
 --- a/widget/headless/HeadlessCompositorWidget.h
 +++ b/widget/headless/HeadlessCompositorWidget.h
 @@ -5,6 +5,7 @@
@@ -2528,10 +2593,10 @@ index 8374cd00944eddad27563624cd33bb046b6cf143..0345d19d1da862ccd31afa49b123e9f1
  #define widget_headless_HeadlessCompositorWidget_h
  
 +#include "mozilla/ReentrantMonitor.h"
+ #include "HeadlessWidget.h"
  #include "mozilla/widget/CompositorWidget.h"
  
- #include "HeadlessWidget.h"
-@@ -22,8 +23,11 @@ class HeadlessCompositorWidget final : public CompositorWidget,
+@@ -21,8 +22,11 @@ class HeadlessCompositorWidget final : public CompositorWidget,
                             HeadlessWidget* aWindow);
  
    void NotifyClientSizeChanged(const LayoutDeviceIntSize& aClientSize);
@@ -2543,7 +2608,7 @@ index 8374cd00944eddad27563624cd33bb046b6cf143..0345d19d1da862ccd31afa49b123e9f1
  
    uintptr_t GetWidgetKey() override;
  
-@@ -41,10 +45,18 @@ class HeadlessCompositorWidget final : public CompositorWidget,
+@@ -40,10 +44,18 @@ class HeadlessCompositorWidget final : public CompositorWidget,
    }
  
   private:
@@ -2563,7 +2628,7 @@ index 8374cd00944eddad27563624cd33bb046b6cf143..0345d19d1da862ccd31afa49b123e9f1
  
  }  // namespace widget
 diff --git a/widget/headless/HeadlessLookAndFeelGTK.cpp b/widget/headless/HeadlessLookAndFeelGTK.cpp
-index 34ef4bf32bc4c348bd226f1c3ea5a4f03ad4fac1..394e892cdf35c351b9d8536dcb82c1a130cb2095 100644
+index d6e94f053c22d9ed5df36b1c20cd408c2605bdc5..31fdf23775544cf1ee9e89e8dd09bcc2166b067b 100644
 --- a/widget/headless/HeadlessLookAndFeelGTK.cpp
 +++ b/widget/headless/HeadlessLookAndFeelGTK.cpp
 @@ -3,6 +3,7 @@
@@ -2588,10 +2653,10 @@ index 34ef4bf32bc4c348bd226f1c3ea5a4f03ad4fac1..394e892cdf35c351b9d8536dcb82c1a1
      default:
        aResult = 0;
 diff --git a/widget/headless/HeadlessWidget.cpp b/widget/headless/HeadlessWidget.cpp
-index 0841e299ea23692310db27acfa78f7e2050bb002..3285e16397b14400127c81c0d1a13711e536b073 100644
+index 0c28540ee6aca7f888ab505f6aeb80e61b9981d6..23458a37b6993996e43138bd0e547e9fc7df6614 100644
 --- a/widget/headless/HeadlessWidget.cpp
 +++ b/widget/headless/HeadlessWidget.cpp
-@@ -112,6 +112,8 @@ void HeadlessWidget::Destroy() {
+@@ -113,6 +113,8 @@ void HeadlessWidget::Destroy() {
      }
    }
  
@@ -2600,7 +2665,7 @@ index 0841e299ea23692310db27acfa78f7e2050bb002..3285e16397b14400127c81c0d1a13711
    nsIWidget::OnDestroy();
  
    nsIWidget::Destroy();
-@@ -573,5 +575,14 @@ nsresult HeadlessWidget::SynthesizeNativeTouchpadPan(
+@@ -574,5 +576,14 @@ nsresult HeadlessWidget::SynthesizeNativeTouchpadPan(
    return NS_OK;
  }
  
@@ -2616,7 +2681,7 @@ index 0841e299ea23692310db27acfa78f7e2050bb002..3285e16397b14400127c81c0d1a13711
  }  // namespace widget
  }  // namespace mozilla
 diff --git a/widget/headless/HeadlessWidget.h b/widget/headless/HeadlessWidget.h
-index 9daa3334e7ec6aee433ee7a28e6b86a8548f6226..0aa21a1b0a3b07548d832bfb41f73fe37a174fdc 100644
+index 05ae8d02e81e65ec22729173995968367fb026e7..236d2991b75fb613af90d699b5a8f7dcca99a7aa 100644
 --- a/widget/headless/HeadlessWidget.h
 +++ b/widget/headless/HeadlessWidget.h
 @@ -127,6 +127,9 @@ class HeadlessWidget final : public nsIWidget {
@@ -2630,10 +2695,10 @@ index 9daa3334e7ec6aee433ee7a28e6b86a8548f6226..0aa21a1b0a3b07548d832bfb41f73fe3
    ~HeadlessWidget();
    bool mEnabled;
 diff --git a/xpcom/reflect/xptinfo/xptinfo.h b/xpcom/reflect/xptinfo/xptinfo.h
-index 2888ffaf432e16d67d348ff008372fbb96c06991..cd4cce73f69bee86d4fb7cb510cd60de0cbcd0b8 100644
+index 7b1d918e86af55b5f961d839ca5009335b56d88b..3d2bc9339173a7358137fc28f0441932061d82bc 100644
 --- a/xpcom/reflect/xptinfo/xptinfo.h
 +++ b/xpcom/reflect/xptinfo/xptinfo.h
-@@ -503,7 +503,7 @@ static_assert(sizeof(nsXPTMethodInfo) == 8, "wrong size");
+@@ -504,7 +504,7 @@ static_assert(sizeof(nsXPTMethodInfo) == 8, "wrong size");
  #if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
  #  define PARAM_BUFFER_COUNT 18
  #else
diff --git a/browser_patches/firefox/preferences/playwright.cfg b/browser_patches/firefox/preferences/playwright.cfg
index f6a3cd845c..f635ae6c8f 100644
--- a/browser_patches/firefox/preferences/playwright.cfg
+++ b/browser_patches/firefox/preferences/playwright.cfg
@@ -20,6 +20,11 @@ pref("dom.security.https_first", false);
 pref("datareporting.policy.dataSubmissionEnabled", false);
 pref("datareporting.policy.dataSubmissionPolicyAccepted", false);
 pref("datareporting.policy.dataSubmissionPolicyBypassNotification", true);
+// Do not show the "Terms of Use" first-run notification (Firefox 154+).
+pref("termsofuse.bypassNotification", true);
+// Do not show the pre-onboarding splash modal in the first window; it waits
+// for Nimbus experiments to load and blocks all mouse input (Firefox 154+).
+pref("browser.preonboarding.enabled", false);
 
 // Force pdfs into downloads.
 pref("pdfjs.disabled", true);
@@ -148,7 +153,7 @@ pref("ui.use_standins_for_native_colors", true);
 // Turn off the Push service.
 pref("dom.push.serverURL", "");
 // Prevent Remote Settings (firefox.settings.services.mozilla.com) to issue non local connections.
-pref("services.settings.server", "");
+pref("services.settings.server", "data:,#remote-settings-dummy/v1");
 // Prevent location.services.mozilla.com to issue non local connections.
 pref("browser.region.network.url", "");
 pref("browser.pocket.enabled", false);
diff --git a/packages/playwright-core/browsers.json b/packages/playwright-core/browsers.json
index 537a365ae8..0636a59f78 100644
--- a/packages/playwright-core/browsers.json
+++ b/packages/playwright-core/browsers.json
@@ -17,7 +17,7 @@
     },
     {
       "name": "firefox",
-      "revision": "1543",
+      "revision": "1544",
       "installByDefault": true,
       "browserVersion": "155.0",
       "title": "Firefox"