diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index f4ee2f12a9f..c0d31bd7026 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -2492,6 +2492,7 @@ NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TabChildGlobal)
   NS_INTERFACE_MAP_ENTRY(nsISyncMessageSender)
   NS_INTERFACE_MAP_ENTRY(nsIContentFrameMessageManager)
   NS_INTERFACE_MAP_ENTRY(nsIScriptObjectPrincipal)
+  NS_INTERFACE_MAP_ENTRY(nsIGlobalObject)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ContentFrameMessageManager)
 NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
 
@@ -2556,10 +2557,20 @@ TabChildGlobal::GetJSContextForEventHandlers()
   return nsContentUtils::GetSafeJSContext();
 }
 
-nsIPrincipal* 
+nsIPrincipal*
 TabChildGlobal::GetPrincipal()
 {
   if (!mTabChild)
     return nullptr;
   return mTabChild->GetPrincipal();
 }
+
+JSObject*
+TabChildGlobal::GetGlobalJSObject()
+{
+  NS_ENSURE_TRUE(mTabChild, nullptr);
+  nsCOMPtr<nsIXPConnectJSObjectHolder> ref = mTabChild->GetGlobal();
+  NS_ENSURE_TRUE(ref, nullptr);
+  return ref->GetJSObject();
+}
+
diff --git a/dom/ipc/TabChild.h b/dom/ipc/TabChild.h
index cf42622b898..ab77432bcde 100644
--- a/dom/ipc/TabChild.h
+++ b/dom/ipc/TabChild.h
@@ -51,7 +51,8 @@ class ClonedMessageData;
 
 class TabChildGlobal : public nsDOMEventTargetHelper,
                        public nsIContentFrameMessageManager,
-                       public nsIScriptObjectPrincipal
+                       public nsIScriptObjectPrincipal,
+                       public nsIGlobalObject
 {
 public:
   TabChildGlobal(TabChild* aTabChild);
@@ -127,6 +128,7 @@ public:
 
   virtual JSContext* GetJSContextForEventHandlers() MOZ_OVERRIDE;
   virtual nsIPrincipal* GetPrincipal() MOZ_OVERRIDE;
+  virtual JSObject* GetGlobalJSObject() MOZ_OVERRIDE;
 
   nsCOMPtr<nsIContentFrameMessageManager> mMessageManager;
   TabChild* mTabChild;