--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -426,24 +426,16 @@ TabChild::TabChild(nsIContentChild* aMan
     }
   }
 
   for (uint32_t idx = 0; idx < NUMBER_OF_AUDIO_CHANNELS; idx++) {
     mAudioChannelsActive.AppendElement(false);
   }
 }
 
-const CompositorOptions&
-TabChild::GetCompositorOptions() const
-{
-  // If you're calling this before mCompositorOptions is set, well.. don't.
-  MOZ_ASSERT(mCompositorOptions);
-  return mCompositorOptions.ref();
-}
-
 bool
 TabChild::AsyncPanZoomEnabled() const
 {
   // By the time anybody calls this, we must have had InitRenderingState called
   // already, and so mCompositorOptions should be populated.
   MOZ_RELEASE_ASSERT(mCompositorOptions);
   return mCompositorOptions->UseAPZ();
 }

--- a/dom/ipc/TabChild.h
+++ b/dom/ipc/TabChild.h
@@ -615,17 +615,16 @@ public:
 
   bool IPCOpen() const { return mIPCOpen; }
 
   bool ParentIsActive() const
   {
     return mParentIsActive;
   }
 
-  const mozilla::layers::CompositorOptions& GetCompositorOptions() const;
   bool AsyncPanZoomEnabled() const;
 
   virtual ScreenIntSize GetInnerSize() override;
 
   // Call RecvShow(nsIntSize(0, 0)) and block future calls to RecvShow().
   void DoFakeShow(const TextureFactoryIdentifier& aTextureFactoryIdentifier,
                   const uint64_t& aLayersId,
                   PRenderFrameChild* aRenderFrame,

--- a/widget/PuppetWidget.cpp
+++ b/widget/PuppetWidget.cpp
@@ -602,20 +602,17 @@ PuppetWidget::GetLayerManager(PLayerTran
     if (XRE_IsParentProcess()) {
       // On the parent process there is no CompositorBridgeChild which confuses
       // some layers code, so we use basic layers instead. Note that we create
       // a non-retaining layer manager since we don't care about performance.
       mLayerManager = new BasicLayerManager(BasicLayerManager::BLM_OFFSCREEN);
       return mLayerManager;
     }
 
-    bool useWebRender = mTabChild
-        ? mTabChild->GetCompositorOptions().UseWebRender()
-        : gfxVars::UseWebRender();
-    if (useWebRender) {
+    if (gfxVars::UseWebRender()) {
       mLayerManager = new WebRenderLayerManager(this);
     } else {
       mLayerManager = new ClientLayerManager(this);
     }
   }
 
   // Attach a shadow forwarder if none exists.
   ShadowLayerForwarder* lf = mLayerManager->AsShadowForwarder();
@@ -629,17 +626,17 @@ PuppetWidget::GetLayerManager(PLayerTran
 LayerManager*
 PuppetWidget::RecreateLayerManager(PLayerTransactionChild* aShadowManager)
 {
   // Force the old LM to self destruct, otherwise if the reference dangles we
   // could fail to revoke the most recent transaction.
   DestroyLayerManager();
 
   MOZ_ASSERT(mTabChild);
-  if (mTabChild->GetCompositorOptions().UseWebRender()) {
+  if (gfxVars::UseWebRender()) {
     mLayerManager = new WebRenderLayerManager(this);
   } else {
     mLayerManager = new ClientLayerManager(this);
   }
   if (ShadowLayerForwarder* lf = mLayerManager->AsShadowForwarder()) {
     lf->SetShadowManager(aShadowManager);
   }
   return mLayerManager;