--- a/content/media/fmp4/MP4Reader.cpp
+++ b/content/media/fmp4/MP4Reader.cpp
@@ -140,17 +140,17 @@ MP4Reader::InitLayersBackendType()
 
   dom::HTMLMediaElement* element = owner->GetMediaElement();
   NS_ENSURE_TRUE_VOID(element);
 
   nsRefPtr<LayerManager> layerManager =
     nsContentUtils::LayerManagerForDocument(element->OwnerDoc());
   NS_ENSURE_TRUE_VOID(layerManager);
 
-  mLayersBackendType = layerManager->GetBackendType();
+  mLayersBackendType = layerManager->GetCompositorBackendType();
 }
 
 nsresult
 MP4Reader::Init(MediaDecoderReader* aCloneDonor)
 {
   MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
   PlatformDecoderModule::Init();
   mMP4Stream = new MP4Stream(mDecoder->GetResource());

--- a/content/media/fmp4/wmf/WMFVideoOutputSource.cpp
+++ b/content/media/fmp4/wmf/WMFVideoOutputSource.cpp
@@ -64,17 +64,18 @@ public:
 bool
 WMFVideoOutputSource::InitializeDXVA()
 {
   // If we use DXVA but aren't running with a D3D layer manager then the
   // readback of decoded video frames from GPU to CPU memory grinds painting
   // to a halt, and makes playback performance *worse*.
   if (!mDXVAEnabled ||
       (mLayersBackend != LayersBackend::LAYERS_D3D9 &&
-       mLayersBackend != LayersBackend::LAYERS_D3D10)) {
+       mLayersBackend != LayersBackend::LAYERS_D3D10 &&
+       mLayersBackend != LayersBackend::LAYERS_D3D11)) {
     return false;
   }
 
   // The DXVA manager must be created on the main thread.
   nsRefPtr<CreateDXVAManagerEvent> event(new CreateDXVAManagerEvent());
   NS_DispatchToMainThread(event, NS_DISPATCH_SYNC);
   mDXVA2Manager = event->mDXVA2Manager;
 

--- a/content/media/wmf/WMFReader.cpp
+++ b/content/media/wmf/WMFReader.cpp
@@ -98,18 +98,20 @@ WMFReader::InitializeDXVA()
 
   dom::HTMLMediaElement* element = owner->GetMediaElement();
   NS_ENSURE_TRUE(element, false);
 
   nsRefPtr<LayerManager> layerManager =
     nsContentUtils::LayerManagerForDocument(element->OwnerDoc());
   NS_ENSURE_TRUE(layerManager, false);
 
-  if (layerManager->GetBackendType() != LayersBackend::LAYERS_D3D9 &&
-      layerManager->GetBackendType() != LayersBackend::LAYERS_D3D10) {
+  LayersBackend backend = layerManager->GetCompositorBackendType();
+  if (backend != LayersBackend::LAYERS_D3D9 &&
+      backend != LayersBackend::LAYERS_D3D10 &&
+      backend != LayersBackend::LAYERS_D3D11) {
     return false;
   }
 
   mDXVA2Manager = DXVA2Manager::Create();
 
   return mDXVA2Manager != nullptr;
 }