Backed out 2 changesets (bug 1899874) It is crashing the browser on windows and linux, Bug 1906687. CLOSED TREE

Backed out changeset cd0e7d18bbff (bug 1899874)
Backed out changeset 347c3fe4a18f (bug 1899874)

dom/base/nsContentUtils.cpp

@@ -425,7 +425,6 @@ nsIXPConnect* nsContentUtils::sXPConnect;
 nsIScriptSecurityManager* nsContentUtils::sSecurityManager;
 nsIPrincipal* nsContentUtils::sSystemPrincipal;
 nsIPrincipal* nsContentUtils::sNullSubjectPrincipal;
-nsIPrincipal* nsContentUtils::sFingerprintingProtectionPrincipal;
 nsIConsoleService* nsContentUtils::sConsoleService;
 
 static nsTHashMap<RefPtr<nsAtom>, EventNameMapping>* sAtomEventTable;
@@ -819,15 +818,6 @@ nsresult nsContentUtils::Init() {
 
   nullPrincipal.forget(&sNullSubjectPrincipal);
 
-  RefPtr<nsIPrincipal> fingerprintingProtectionPrincipal =
-      BasePrincipal::CreateContentPrincipal(
-          "about:fingerprintingprotection"_ns);
-  if (!fingerprintingProtectionPrincipal) {
-    return NS_ERROR_FAILURE;
-  }
-
-  fingerprintingProtectionPrincipal.forget(&sFingerprintingProtectionPrincipal);
-
   if (!InitializeEventTable()) return NS_ERROR_FAILURE;
 
   if (!sEventListenerManagersHash) {
@@ -1982,7 +1972,6 @@ void nsContentUtils::Shutdown() {
   NS_IF_RELEASE(sSecurityManager);
   NS_IF_RELEASE(sSystemPrincipal);
   NS_IF_RELEASE(sNullSubjectPrincipal);
-  NS_IF_RELEASE(sFingerprintingProtectionPrincipal);
 
   sBidiKeyboard = nullptr;
 

dom/base/nsContentUtils.h

@@ -2164,13 +2164,6 @@ class nsContentUtils {
     return sNullSubjectPrincipal;
   }
 
-  /**
-   * Gets the about:fingerprintingprotection principal.
-   */
-  static nsIPrincipal* GetFingerprintingProtectionPrincipal() {
-    return sFingerprintingProtectionPrincipal;
-  }
-
   /**
    * *aResourcePrincipal is a principal describing who may access the contents
    * of a resource. The resource can only be consumed by a principal that
@@ -3648,7 +3641,6 @@ class nsContentUtils {
   static nsIScriptSecurityManager* sSecurityManager;
   static nsIPrincipal* sSystemPrincipal;
   static nsIPrincipal* sNullSubjectPrincipal;
-  static nsIPrincipal* sFingerprintingProtectionPrincipal;
 
   static nsIConsoleService* sConsoleService;
 

dom/canvas/CanvasRenderingContext2D.cpp

@@ -1121,7 +1121,6 @@ void CanvasRenderingContext2D::GetContextAttributes(
 
   aSettings.mAlpha = mContextAttributesHasAlpha;
   aSettings.mWillReadFrequently = mWillReadFrequently;
-  aSettings.mForceSoftwareRendering = mForceSoftwareRendering;
 
   // We don't support the 'desynchronized' and 'colorSpace' attributes, so
   // those just keep their default values.
@@ -1472,7 +1471,7 @@ bool CanvasRenderingContext2D::BorrowTarget(const IntRect& aPersistedRect,
   // acceleration, then we skip trying to use this provider so that it will be
   // recreated by EnsureTarget later.
   if (!mBufferProvider || mBufferProvider->RequiresRefresh() ||
-      (mBufferProvider->IsAccelerated() && UseSoftwareRendering())) {
+      (mBufferProvider->IsAccelerated() && GetEffectiveWillReadFrequently())) {
     return false;
   }
   mTarget = mBufferProvider->BorrowDrawTarget(aPersistedRect);
@@ -1723,7 +1722,7 @@ bool CanvasRenderingContext2D::TryAcceleratedTarget(
   }
   // Don't try creating an accelerate DrawTarget if either acceleration failed
   // previously or if the application expects acceleration to be slow.
-  if (!mAllowAcceleration || UseSoftwareRendering()) {
+  if (!mAllowAcceleration || GetEffectiveWillReadFrequently()) {
     return false;
   }
 
@@ -1780,7 +1779,7 @@ bool CanvasRenderingContext2D::TrySharedTarget(
 
     aOutProvider = renderer->CreatePersistentBufferProvider(
         GetSize(), GetSurfaceFormat(),
-        !mAllowAcceleration || UseSoftwareRendering());
+        !mAllowAcceleration || GetEffectiveWillReadFrequently());
   } else if (mOffscreenCanvas) {
     if (!StaticPrefs::gfx_offscreencanvas_shared_provider()) {
       return false;
@@ -1794,7 +1793,7 @@ bool CanvasRenderingContext2D::TrySharedTarget(
 
     aOutProvider = PersistentBufferProviderShared::Create(
         GetSize(), GetSurfaceFormat(), imageBridge,
-        !mAllowAcceleration || UseSoftwareRendering(),
+        !mAllowAcceleration || GetEffectiveWillReadFrequently(),
         mOffscreenCanvas->GetWindowID());
   }
 
@@ -1815,7 +1814,7 @@ bool CanvasRenderingContext2D::TryBasicTarget(
     RefPtr<layers::PersistentBufferProvider>& aOutProvider,
     ErrorResult& aError) {
   aOutDT = gfxPlatform::GetPlatform()->CreateOffscreenCanvasDrawTarget(
-      GetSize(), GetSurfaceFormat(), UseSoftwareRendering());
+      GetSize(), GetSurfaceFormat());
   if (!aOutDT) {
     aError.ThrowInvalidStateError("Canvas could not create basic draw target.");
     return false;
@@ -2028,7 +2027,6 @@ CanvasRenderingContext2D::SetContextOptions(JSContext* aCx,
   }
 
   mWillReadFrequently = attributes.mWillReadFrequently;
-  mForceSoftwareRendering = attributes.mForceSoftwareRendering;
 
   mContextAttributesHasAlpha = attributes.mAlpha;
   UpdateIsOpaque();
@@ -6671,10 +6669,9 @@ void CanvasRenderingContext2D::SetWriteOnly() {
   }
 }
 
-bool CanvasRenderingContext2D::UseSoftwareRendering() const {
-  return (StaticPrefs::gfx_canvas_willreadfrequently_enabled_AtStartup() &&
-          mWillReadFrequently) ||
-         mForceSoftwareRendering;
+bool CanvasRenderingContext2D::GetEffectiveWillReadFrequently() const {
+  return StaticPrefs::gfx_canvas_willreadfrequently_enabled_AtStartup() &&
+         mWillReadFrequently;
 }
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CanvasPath, mParent)

dom/canvas/CanvasRenderingContext2D.h

@@ -811,7 +811,7 @@ class CanvasRenderingContext2D : public nsICanvasRenderingContextInternal,
     return CurrentState().font;
   }
 
-  bool UseSoftwareRendering() const;
+  bool GetEffectiveWillReadFrequently() const;
 
   // Member vars
   int32_t mWidth, mHeight;
@@ -857,8 +857,6 @@ class CanvasRenderingContext2D : public nsICanvasRenderingContextInternal,
   // Whether the application expects to use operations that perform poorly with
   // acceleration.
   bool mWillReadFrequently = false;
-  // Whether to force software rendering
-  bool mForceSoftwareRendering = false;
   // Whether or not we have already shutdown.
   bool mHasShutdown = false;
   // Whether or not remote canvas is currently unavailable.

dom/canvas/ClientWebGLContext.cpp

@@ -769,7 +769,6 @@ void ClientWebGLContext::GetContextAttributes(
   result.mPreserveDrawingBuffer = options.preserveDrawingBuffer;
   result.mFailIfMajorPerformanceCaveat = options.failIfMajorPerformanceCaveat;
   result.mPowerPreference = options.powerPreference;
-  result.mForceSoftwareRendering = options.forceSoftwareRendering;
 }
 
 // -----------------------
@@ -1062,7 +1061,6 @@ ClientWebGLContext::SetContextOptions(JSContext* cx,
       attributes.mFailIfMajorPerformanceCaveat;
   newOpts.xrCompatible = attributes.mXrCompatible;
   newOpts.powerPreference = attributes.mPowerPreference;
-  newOpts.forceSoftwareRendering = attributes.mForceSoftwareRendering;
   newOpts.enableDebugRendererInfo =
       StaticPrefs::webgl_enable_debug_renderer_info();
   MOZ_ASSERT(mCanvasElement || mOffscreenCanvas);
@@ -2320,7 +2318,7 @@ void ClientWebGLContext::GetParameter(JSContext* cx, GLenum pname,
         retval.set(JS::NumberValue(state.mPixelUnpackState.skipRows));
         return;
     }  // switch pname
-  }  // if webgl2
+  }    // if webgl2
 
   // -
 

dom/canvas/WebGLContext.cpp

@@ -287,11 +287,6 @@ bool WebGLContext::CreateAndInitGL(
     flags |= gl::CreateContextFlags::FORBID_SOFTWARE;
   }
 
-  if (mOptions.forceSoftwareRendering) {
-    flags |= gl::CreateContextFlags::FORBID_HARDWARE;
-    flags &= ~gl::CreateContextFlags::FORBID_SOFTWARE;
-  }
-
   if (forceEnabled) {
     flags &= ~gl::CreateContextFlags::FORBID_HARDWARE;
     flags &= ~gl::CreateContextFlags::FORBID_SOFTWARE;

dom/canvas/WebGLTypes.h

@@ -363,11 +363,9 @@ struct WebGLContextOptions final {
   dom::WebGLPowerPreference powerPreference =
       dom::WebGLPowerPreference::Default;
   std::optional<dom::PredefinedColorSpace> colorSpace;
-  bool forceSoftwareRendering = false;
   bool shouldResistFingerprinting = true;
 
   bool enableDebugRendererInfo = false;
-  PaddingField<uint8_t, 7> _padding;
 
   auto MutTiedFields() {
     // clang-format off
@@ -384,12 +382,9 @@ struct WebGLContextOptions final {
 
       powerPreference,
       colorSpace,
-      forceSoftwareRendering,
       shouldResistFingerprinting,
 
-      enableDebugRendererInfo,
-
-      _padding);
+      enableDebugRendererInfo);
     // clang-format on
   }
 

dom/webidl/CanvasRenderingContext2D.webidl

@@ -34,9 +34,6 @@ dictionary CanvasRenderingContext2DSettings {
 
   // whether or not we're planning to do a lot of readback operations
   boolean willReadFrequently = false;
-
-  [Func="nsRFPService::IsSoftwareRenderingOptionExposed"]
-  boolean forceSoftwareRendering = false;
 };
 
 dictionary HitRegionOptions {

dom/webidl/WebGLRenderingContext.webidl

@@ -56,9 +56,6 @@ dictionary WebGLContextAttributes {
     // We are experimenting here, though this should be close to where we end up.
     [Pref="webgl.colorspaces.prototype"]
     PredefinedColorSpace colorSpace; // = "srgb"; Default is gfx::ColorSpace2::UNKNOWN for now.
-
-    [Func="nsRFPService::IsSoftwareRenderingOptionExposed"]
-    GLboolean forceSoftwareRendering = false;
 };
 
 [Exposed=(Window,Worker),

gfx/gl/GLContextProviderEGL.cpp

@@ -228,7 +228,7 @@ already_AddRefed<GLContext> GLContextEGLFactory::CreateImpl(
     gfxCriticalNote << "Failed[3] to load EGL library: " << failureId.get();
     return nullptr;
   }
-  const auto egl = lib->CreateDisplay(true, false, &failureId);
+  const auto egl = lib->CreateDisplay(true, &failureId);
   if (!egl) {
     gfxCriticalNote << "Failed[3] to create EGL library  display: "
                     << failureId.get();

gfx/gl/GLContextProviderGLX.cpp

@@ -887,11 +887,6 @@ static already_AddRefed<GLContextGLX> CreateOffscreenPixmapContext(
 
   auto fullDesc = GLContextDesc{desc};
   fullDesc.isOffscreen = true;
-
-  if (fullDesc.flags & CreateContextFlags::FORBID_HARDWARE) {
-    fullDesc.flags |= CreateContextFlags::REQUIRE_COMPAT_PROFILE;
-  }
-
   return GLContextGLX::CreateGLContext(fullDesc, display, pixmap, config,
                                        drawable);
 }

gfx/gl/GLContextProviderWGL.cpp

@@ -472,9 +472,7 @@ already_AddRefed<GLContext> GLContextProviderWGL::CreateHeadless(
   int chosenFormat;
   UINT foundFormats = 0;
 
-  bool forbidHardware =
-      static_cast<bool>(desc.flags & CreateContextFlags::FORBID_HARDWARE);
-  if (!foundFormats && forbidHardware) {
+  if (!foundFormats) {
     const int kAttribs[] = {LOCAL_WGL_DRAW_TO_PBUFFER_ARB,
                             true,
                             LOCAL_WGL_SUPPORT_OPENGL_ARB,

gfx/gl/GLLibraryEGL.cpp

@@ -868,27 +868,26 @@ std::shared_ptr<EglDisplay> GLLibraryEGL::DefaultDisplay(
   auto ret = mDefaultDisplay.lock();
   if (ret) return ret;
 
-  ret = CreateDisplayLocked(false, false, out_failureId, lock);
+  ret = CreateDisplayLocked(false, out_failureId, lock);
   mDefaultDisplay = ret;
   return ret;
 }
 
 std::shared_ptr<EglDisplay> GLLibraryEGL::CreateDisplay(
-    const bool forceAccel, const bool forceSoftware,
-    nsACString* const out_failureId) {
+    const bool forceAccel, nsACString* const out_failureId) {
   StaticMutexAutoLock lock(sMutex);
-  return CreateDisplayLocked(forceAccel, forceSoftware, out_failureId, lock);
+  return CreateDisplayLocked(forceAccel, out_failureId, lock);
 }
 
 std::shared_ptr<EglDisplay> GLLibraryEGL::CreateDisplayLocked(
-    const bool forceAccel, const bool forceSoftware,
-    nsACString* const out_failureId, const StaticMutexAutoLock& aProofOfLock) {
+    const bool forceAccel, nsACString* const out_failureId,
+    const StaticMutexAutoLock& aProofOfLock) {
   std::shared_ptr<EglDisplay> ret;
 
   if (IsExtensionSupported(EGLLibExtension::ANGLE_platform_angle_d3d)) {
     nsCString accelAngleFailureId;
     bool accelAngleSupport = IsAccelAngleSupported(&accelAngleFailureId);
-    bool shouldTryAccel = (forceAccel || accelAngleSupport) && !forceSoftware;
+    bool shouldTryAccel = forceAccel || accelAngleSupport;
     bool shouldTryWARP = !forceAccel;  // Only if ANGLE not supported or fails
 
     // If WARP preferred, will override ANGLE support
@@ -933,7 +932,7 @@ std::shared_ptr<EglDisplay> GLLibraryEGL::CreateDisplayLocked(
   } else {
     void* nativeDisplay = EGL_DEFAULT_DISPLAY;
 #ifdef MOZ_WIDGET_GTK
-    if (!ret && (!gfx::gfxVars::WebglUseHardware() || forceSoftware)) {
+    if (!ret && !gfx::gfxVars::WebglUseHardware()) {
       // Initialize a swrast egl device such as llvmpipe
       ret = GetAndInitSoftwareDisplay(*this, aProofOfLock);
     }

gfx/gl/GLLibraryEGL.h

@@ -152,13 +152,13 @@ class GLLibraryEGL final {
   void InitLibExtensions();
 
   std::shared_ptr<EglDisplay> CreateDisplayLocked(
-      bool forceAccel, bool forceSoftware, nsACString* const out_failureId,
+      bool forceAccel, nsACString* const out_failureId,
       const StaticMutexAutoLock& aProofOfLock);
 
  public:
   Maybe<SymbolLoader> GetSymbolLoader() const;
 
-  std::shared_ptr<EglDisplay> CreateDisplay(bool forceAccel, bool forceSoftware,
+  std::shared_ptr<EglDisplay> CreateDisplay(bool forceAccel,
                                             nsACString* const out_failureId);
   std::shared_ptr<EglDisplay> CreateDisplay(ID3D11Device*);
   std::shared_ptr<EglDisplay> DefaultDisplay(nsACString* const out_failureId);

gfx/layers/client/TextureClient.cpp

@@ -312,15 +312,13 @@ static TextureType ChooseTextureType(gfx::SurfaceFormat aFormat,
 #endif
 
 #ifdef XP_MACOSX
-  if (StaticPrefs::gfx_use_iosurface_textures_AtStartup() &&
-      !aKnowsCompositor->UsingSoftwareWebRender()) {
+  if (StaticPrefs::gfx_use_iosurface_textures_AtStartup()) {
     return TextureType::MacIOSurface;
   }
 #endif
 
 #ifdef MOZ_WIDGET_ANDROID
-  if (StaticPrefs::gfx_use_surfacetexture_textures_AtStartup() &&
-      !aKnowsCompositor->UsingSoftwareWebRender()) {
+  if (StaticPrefs::gfx_use_surfacetexture_textures_AtStartup()) {
     return TextureType::AndroidNativeWindow;
   }
 #endif
@@ -1494,7 +1492,6 @@ already_AddRefed<TextureClient> TextureClient::CreateForRawBufferAccess(
                            aMoz2DBackend == gfx::BackendType::DIRECT2D1_1,
                        "Unsupported TextureClient backend type");
 
-  // For future changes, check aAllocFlags aAllocFlags & ALLOC_DO_NOT_ACCELERATE
   TextureData* texData = BufferTextureData::Create(
       aSize, aFormat, gfx::BackendType::SKIA, aLayersBackend, aTextureFlags,
       aAllocFlags, aAllocator);

gfx/thebes/gfxPlatform.cpp

@@ -1678,35 +1678,19 @@ already_AddRefed<DrawTarget> gfxPlatform::CreateDrawTargetForBackend(
 }
 
 already_AddRefed<DrawTarget> gfxPlatform::CreateOffscreenCanvasDrawTarget(
-    const IntSize& aSize, SurfaceFormat aFormat, bool aRequireSoftwareRender) {
+    const IntSize& aSize, SurfaceFormat aFormat) {
   NS_ASSERTION(mPreferredCanvasBackend != BackendType::NONE, "No backend.");
 
-  BackendType backend = mFallbackCanvasBackend;
   // If we are using remote canvas we don't want to use acceleration in
   // canvas DrawTargets we are not remoting, so we always use the fallback
   // software one.
   if (!gfxPlatform::UseRemoteCanvas() ||
       !gfxPlatform::IsBackendAccelerated(mPreferredCanvasBackend)) {
-    backend = mPreferredCanvasBackend;
-  }
-
-  if (aRequireSoftwareRender) {
-    backend = gfxPlatform::IsBackendAccelerated(mPreferredCanvasBackend)
-                  ? mFallbackCanvasBackend
-                  : mPreferredCanvasBackend;
-  }
-
-#ifdef XP_WIN
-  // On Windows, the fallback backend (Cairo) should use its image backend.
-  RefPtr<DrawTarget> target =
-      Factory::CreateDrawTarget(backend, aSize, aFormat);
-#else
-  RefPtr<DrawTarget> target =
-      CreateDrawTargetForBackend(backend, aSize, aFormat);
-#endif
-
-  if (target || mFallbackCanvasBackend == BackendType::NONE) {
-    return target.forget();
+    RefPtr<DrawTarget> target =
+        CreateDrawTargetForBackend(mPreferredCanvasBackend, aSize, aFormat);
+    if (target || mFallbackCanvasBackend == BackendType::NONE) {
+      return target.forget();
+    }
   }
 
 #ifdef XP_WIN

gfx/thebes/gfxPlatform.h

@@ -265,8 +265,7 @@ class gfxPlatform : public mozilla::layers::MemoryPressureListener {
       bool aFallback = false);
 
   already_AddRefed<DrawTarget> CreateOffscreenCanvasDrawTarget(
-      const mozilla::gfx::IntSize& aSize, mozilla::gfx::SurfaceFormat aFormat,
-      bool aRequireSoftwareRender = false);
+      const mozilla::gfx::IntSize& aSize, mozilla::gfx::SurfaceFormat aFormat);
 
   already_AddRefed<DrawTarget> CreateSimilarSoftwareDrawTarget(
       DrawTarget* aDT, const IntSize& aSize,
@@ -344,7 +343,7 @@ class gfxPlatform : public mozilla::layers::MemoryPressureListener {
    * available fonts on the platform; used to pass the list from chrome to
    * content process. Currently implemented only on MacOSX and Linux.
    */
-  virtual void ReadSystemFontList(mozilla::dom::SystemFontList*) {};
+  virtual void ReadSystemFontList(mozilla::dom::SystemFontList*){};
 
   /**
    * Rebuilds the system font lists (if aFullRebuild is true), or just notifies
@@ -780,7 +779,7 @@ class gfxPlatform : public mozilla::layers::MemoryPressureListener {
   virtual void OnMemoryPressure(
       mozilla::layers::MemoryPressureReason aWhy) override;
 
-  virtual void EnsureDevicesInitialized() {};
+  virtual void EnsureDevicesInitialized(){};
   virtual bool DevicesInitialized() { return true; };
 
   virtual bool IsWaylandDisplay() { return false; }

toolkit/components/resistfingerprinting/UserCharacteristicsPageService.sys.mjs

@@ -160,7 +160,7 @@ export class UserCharacteristicsPageService {
 
   shutdown() {}
 
-  createContentPage(principal) {
+  createContentPage() {
     lazy.console.debug("called createContentPage");
 
     lazy.console.debug("Registering actor");
@@ -184,6 +184,7 @@ export class UserCharacteristicsPageService {
         let { promise, resolve } = Promise.withResolvers();
         this._backgroundBrowsers.set(browser, resolve);
 
+        let principal = Services.scriptSecurityManager.getSystemPrincipal();
         let loadURIOptions = {
           triggeringPrincipal: principal,
         };

toolkit/components/resistfingerprinting/nsIUserCharacteristicsPageService.idl

@@ -3,7 +3,6 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 #include "nsISupports.idl"
-#include "nsIPrincipal.idl"
 
 webidl BrowsingContext;
 
@@ -14,7 +13,7 @@ interface nsIUserCharacteristicsPageService : nsISupports {
      * Create the UserCharacteristics about: page as a HiddenFrame
      * and begin the data collection.
      */
-    Promise createContentPage(in nsIPrincipal principal);
+    Promise createContentPage();
 
     /*
      * Called when the UserCharacteristics about: page has been loaded

toolkit/components/resistfingerprinting/nsRFPService.cpp

@@ -1888,22 +1888,6 @@ bool nsRFPService::CheckSuspiciousFingerprintingActivity(
   return cnt > kSuspiciousFingerprintingActivityThreshold;
 }
 
-/* static */
-bool nsRFPService::IsSoftwareRenderingOptionExposed(JSContext* aCx,
-                                                    JSObject* aObj) {
-  if (!NS_IsMainThread()) {
-    return false;
-  }
-
-  nsIPrincipal* principal = nsContentUtils::ObjectPrincipal(aObj);
-  if (nsContentUtils::SubjectPrincipal(aCx)->IsSystemPrincipal()) {
-    return true;
-  }
-
-  return principal->Equals(
-      nsContentUtils::GetFingerprintingProtectionPrincipal());
-}
-
 /* static */
 nsresult nsRFPService::CreateOverrideDomainKey(
     nsIFingerprintingOverride* aOverride, nsACString& aDomainKey) {

toolkit/components/resistfingerprinting/nsRFPService.h

@@ -221,8 +221,6 @@ class nsRFPService final : public nsIObserver, public nsIRFPService {
       bool aIsPrivateMode, RFPTarget aTarget,
       const Maybe<RFPTarget>& aOverriddenFingerprintingSettings);
 
-  static bool IsSoftwareRenderingOptionExposed(JSContext*, JSObject*);
-
   // --------------------------------------------------------------------------
   static double TimerResolution(RTPCallerType aRTPCallerType);
 

toolkit/components/resistfingerprinting/nsUserCharacteristics.cpp

@@ -109,9 +109,7 @@ RefPtr<PopulatePromise> ContentPageStuff() {
 
   RefPtr<PopulatePromise> populatePromise = new PopulatePromise(__func__);
   RefPtr<mozilla::dom::Promise> promise;
-  nsresult rv = ucp->CreateContentPage(
-      nsContentUtils::GetFingerprintingProtectionPrincipal(),
-      getter_AddRefs(promise));
+  nsresult rv = ucp->CreateContentPage(getter_AddRefs(promise));
   if (NS_FAILED(rv)) {
     MOZ_LOG(gUserCharacteristicsLog, mozilla::LogLevel::Error,
             ("Could not create Content Page"));