--- a/dom/bindings/BindingUtils.h
+++ b/dom/bindings/BindingUtils.h
@@ -20,16 +20,17 @@
 #include "mozilla/dom/Exceptions.h"
 #include "mozilla/dom/NonRefcountedDOMObject.h"
 #include "mozilla/dom/Nullable.h"
 #include "mozilla/dom/RootedDictionary.h"
 #include "mozilla/dom/workers/Workers.h"
 #include "mozilla/ErrorResult.h"
 #include "mozilla/Likely.h"
 #include "mozilla/MemoryReporting.h"
+#include "mozilla/CycleCollectedJSRuntime.h"
 #include "nsCycleCollector.h"
 #include "nsIXPConnect.h"
 #include "nsJSUtils.h"
 #include "nsISupportsImpl.h"
 #include "qsObjectHelper.h"
 #include "xpcpublic.h"
 #include "nsIVariant.h"
 #include "pldhash.h" // For PLDHashOperator
@@ -3074,16 +3075,38 @@ WrappedJSToDictionary(JSContext* aCx, ns
     return false;
   }
 
   JSAutoCompartment ac(aCx, obj);
   JS::Rooted<JS::Value> v(aCx, JS::ObjectValue(*obj));
   return aDictionary.Init(aCx, v);
 }
 
+template<class T>
+inline bool
+WrappedJSToDictionary(nsISupports* aObject, T& aDictionary)
+{
+  nsCOMPtr<nsIXPConnectWrappedJS> wrappedObj = do_QueryInterface(aObject);
+  NS_ENSURE_TRUE(wrappedObj, false);
+  JS::Rooted<JSObject*> obj(CycleCollectedJSRuntime::Get()->Runtime(),
+                            wrappedObj->GetJSObject());
+  NS_ENSURE_TRUE(obj, false);
+
+  nsIGlobalObject* global = xpc::NativeGlobal(obj);
+  NS_ENSURE_TRUE(global, false);
+
+  // we need this AutoEntryScript here because the spec requires us to execute
+  // getters when parsing a dictionary
+  AutoEntryScript aes(global);
+  aes.TakeOwnershipOfErrorReporting();
+
+  JS::Rooted<JS::Value> v(aes.cx(), JS::ObjectValue(*obj));
+  return aDictionary.Init(aes.cx(), v);
+}
+
 
 template<class T, class S>
 inline nsRefPtr<T>
 StrongOrRawPtr(already_AddRefed<S>&& aPtr)
 {
   return aPtr.template downcast<T>();
 }