diff --git a/gfx/layers/ipc/CompositorBridgeChild.cpp b/gfx/layers/ipc/CompositorBridgeChild.cpp
index 618b3d58483c..6424428024e4 100644
--- a/gfx/layers/ipc/CompositorBridgeChild.cpp
+++ b/gfx/layers/ipc/CompositorBridgeChild.cpp
@@ -1132,7 +1132,7 @@ CompositorBridgeChild::HandleFatalError(const char* aName, const char* aMsg) con
 PWebRenderBridgeChild*
 CompositorBridgeChild::AllocPWebRenderBridgeChild(const wr::PipelineId& aPipelineId, TextureFactoryIdentifier*, uint32_t *aIdNamespace)
 {
-  WebRenderBridgeChild* child = new WebRenderBridgeChild(aPipelineId, *aIdNamespace);
+  WebRenderBridgeChild* child = new WebRenderBridgeChild(aPipelineId);
   child->AddIPDLReference();
   return child;
 }
diff --git a/gfx/layers/ipc/CompositorBridgeParent.cpp b/gfx/layers/ipc/CompositorBridgeParent.cpp
index 72251a2ee853..872f503e91d3 100644
--- a/gfx/layers/ipc/CompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/CompositorBridgeParent.cpp
@@ -1591,8 +1591,8 @@ CompositorBridgeParent::AllocPWebRenderBridgeParent(const wr::PipelineId& aPipel
   RefPtr<WebRenderCompositableHolder> holder = new WebRenderCompositableHolder();
   MOZ_ASSERT(api); // TODO have a fallback
   api->SetRootPipeline(aPipelineId);
-  *aIdNamespace = api->GetNamespace().mHandle;
   mWrBridge = new WebRenderBridgeParent(this, aPipelineId, mWidget, nullptr, Move(api), Move(holder));
+  *aIdNamespace = mWrBridge->GetIdNameSpace();
 
   mCompositorScheduler = mWrBridge->CompositorScheduler();
   MOZ_ASSERT(mCompositorScheduler);
diff --git a/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp b/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp
index 76492b1ee0ed..ae91468ae656 100644
--- a/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp
@@ -228,7 +228,8 @@ CrossProcessCompositorBridgeParent::AllocPWebRenderBridgeParent(const wr::Pipeli
   sIndirectLayerTrees[pipelineHandle].mCrossProcessParent = this;
   sIndirectLayerTrees[pipelineHandle].mWrBridge = parent;
   *aTextureFactoryIdentifier = parent->GetTextureFactoryIdentifier();
-  *aIdNamespace = api->GetNamespace().mHandle;
+  *aIdNamespace = parent->GetIdNameSpace();
+
   return parent;
 }
 
diff --git a/gfx/layers/wr/WebRenderBridgeChild.cpp b/gfx/layers/wr/WebRenderBridgeChild.cpp
index 3a87b1c52cc5..ab4d9b4b2261 100644
--- a/gfx/layers/wr/WebRenderBridgeChild.cpp
+++ b/gfx/layers/wr/WebRenderBridgeChild.cpp
@@ -15,9 +15,9 @@
 namespace mozilla {
 namespace layers {
 
-WebRenderBridgeChild::WebRenderBridgeChild(const wr::PipelineId& aPipelineId, uint32_t aIdNamespace)
+WebRenderBridgeChild::WebRenderBridgeChild(const wr::PipelineId& aPipelineId)
   : mIsInTransaction(false)
-  , mIdNamespace(aIdNamespace)
+  , mIdNamespace(0)
   , mResourceId(0)
   , mIPCOpen(false)
   , mDestroyed(false)
diff --git a/gfx/layers/wr/WebRenderBridgeChild.h b/gfx/layers/wr/WebRenderBridgeChild.h
index ee9b921620ce..e251f50f8333 100644
--- a/gfx/layers/wr/WebRenderBridgeChild.h
+++ b/gfx/layers/wr/WebRenderBridgeChild.h
@@ -28,7 +28,7 @@ class WebRenderBridgeChild final : public PWebRenderBridgeChild
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WebRenderBridgeChild, override)
 
 public:
-  explicit WebRenderBridgeChild(const wr::PipelineId& aPipelineId, uint32_t aIdNamespace);
+  explicit WebRenderBridgeChild(const wr::PipelineId& aPipelineId);
 
   void AddWebRenderCommand(const WebRenderCommand& aCmd);
   void AddWebRenderCommands(const nsTArray<WebRenderCommand>& aCommands);
@@ -56,6 +56,10 @@ public:
 
   uint32_t GetNextResourceId() { return ++mResourceId; }
   uint32_t GetNamespace() { return mIdNamespace; }
+  void SetNamespace(uint32_t aIdNamespace)
+  {
+    mIdNamespace = aIdNamespace;
+  }
 
 private:
   friend class CompositorBridgeChild;
diff --git a/gfx/layers/wr/WebRenderBridgeParent.cpp b/gfx/layers/wr/WebRenderBridgeParent.cpp
index ef68812743e8..577d48dffaa0 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@@ -75,6 +75,8 @@ private:
   InfallibleTArray<OpDestroy>* mActorsToDestroy;
 };
 
+/* static */ uint32_t WebRenderBridgeParent::sIdNameSpace = 0;
+
 WebRenderBridgeParent::WebRenderBridgeParent(CompositorBridgeParentBase* aCompositorBridge,
                                              const wr::PipelineId& aPipelineId,
                                              widget::CompositorWidget* aWidget,
@@ -91,6 +93,7 @@ WebRenderBridgeParent::WebRenderBridgeParent(CompositorBridgeParentBase* aCompos
   , mChildLayerObserverEpoch(0)
   , mParentLayerObserverEpoch(0)
   , mWrEpoch(0)
+  , mIdNameSpace(++sIdNameSpace)
   , mDestroyed(false)
 {
   MOZ_ASSERT(mCompositableHolder);
diff --git a/gfx/layers/wr/WebRenderBridgeParent.h b/gfx/layers/wr/WebRenderBridgeParent.h
index 26dd1788253e..fb4440db7f29 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.h
+++ b/gfx/layers/wr/WebRenderBridgeParent.h
@@ -133,6 +133,11 @@ public:
     aNotifications->AppendElements(Move(mImageCompositeNotifications));
   }
 
+  uint32_t GetIdNameSpace()
+  {
+    return mIdNameSpace;
+  }
+
 private:
   virtual ~WebRenderBridgeParent();
 
@@ -178,8 +183,11 @@ private:
 
   std::queue<PendingTransactionId> mPendingTransactionIds;
   uint32_t mWrEpoch;
+  uint32_t mIdNameSpace;
 
   bool mDestroyed;
+
+  static uint32_t sIdNameSpace;
 };
 
 } // namespace layers
diff --git a/gfx/layers/wr/WebRenderLayerManager.cpp b/gfx/layers/wr/WebRenderLayerManager.cpp
index 39c2fe0d40eb..a19dc8c14f5c 100644
--- a/gfx/layers/wr/WebRenderLayerManager.cpp
+++ b/gfx/layers/wr/WebRenderLayerManager.cpp
@@ -228,6 +228,7 @@ WebRenderLayerManager::Initialize(PCompositorBridgeChild* aCBChild,
   LayoutDeviceIntSize size = mWidget->GetClientSize();
   WrBridge()->SendCreate(size.ToUnknownSize());
   WrBridge()->IdentifyTextureHost(textureFactoryIdentifier);
+  WrBridge()->SetNamespace(id_namespace);
   *aTextureFactoryIdentifier = textureFactoryIdentifier;
 }