--- a/dom/webidl/WorkerGlobalScope.webidl
+++ b/dom/webidl/WorkerGlobalScope.webidl
@@ -38,9 +38,12 @@ WorkerGlobalScope implements WindowOrWor
 // Mozilla extensions
 partial interface WorkerGlobalScope {
 
   void dump(optional DOMString str);
 
   // XXXbz no spec for this yet, because the webperf WG is a bit dysfunctional
   [Constant, Cached]
   readonly attribute Performance performance;
+
+  [Func="WorkerGlobalScope::IsInAutomation", Throws]
+  object getJSTestingFunctions();
 };

--- a/dom/workers/WorkerScope.cpp
+++ b/dom/workers/WorkerScope.cpp
@@ -2,16 +2,17 @@
 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "WorkerScope.h"
 
 #include "jsapi.h"
+#include "jsfriendapi.h"
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/dom/BindingDeclarations.h"
 #include "mozilla/dom/Clients.h"
 #include "mozilla/dom/ClientState.h"
 #include "mozilla/dom/Console.h"
 #include "mozilla/dom/DedicatedWorkerGlobalScopeBinding.h"
 #include "mozilla/dom/DOMPrefs.h"
 #include "mozilla/dom/Fetch.h"
@@ -395,16 +396,36 @@ WorkerGlobalScope::GetPerformance()
 
   if (!mPerformance) {
     mPerformance = Performance::CreateForWorker(mWorkerPrivate);
   }
 
   return mPerformance;
 }
 
+bool
+WorkerGlobalScope::IsInAutomation(JSContext* aCx, JSObject* /* unused */)
+{
+  return GetWorkerPrivateFromContext(aCx)->IsInAutomation();
+}
+
+void
+WorkerGlobalScope::GetJSTestingFunctions(JSContext* aCx,
+                                         JS::MutableHandle<JSObject*> aFunctions,
+                                         ErrorResult& aRv)
+{
+  JSObject* obj = js::GetTestingFunctions(aCx);
+  if (!obj) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return;
+  }
+
+  aFunctions.set(obj);
+}
+
 already_AddRefed<Promise>
 WorkerGlobalScope::Fetch(const RequestOrUSVString& aInput,
                          const RequestInit& aInit,
                          CallerType aCallerType, ErrorResult& aRv)
 {
   return FetchRequest(this, aInput, aInit, aCallerType, aRv);
 }
 

--- a/dom/workers/WorkerScope.h
+++ b/dom/workers/WorkerScope.h
@@ -156,16 +156,21 @@ public:
 
   Performance* GetPerformance();
 
   Performance* GetPerformanceIfExists() const
   {
     return mPerformance;
   }
 
+  static bool IsInAutomation(JSContext* aCx, JSObject* /* unused */);
+  void GetJSTestingFunctions(JSContext* aCx,
+                             JS::MutableHandle<JSObject*> aFunctions,
+                             ErrorResult& aRv);
+
   already_AddRefed<Promise>
   Fetch(const RequestOrUSVString& aInput, const RequestInit& aInit,
         CallerType aCallerType, ErrorResult& aRv);
 
   already_AddRefed<IDBFactory>
   GetIndexedDB(ErrorResult& aErrorResult);
 
   already_AddRefed<cache::CacheStorage>