diff --git a/content/base/src/nsFrameMessageManager.cpp b/content/base/src/nsFrameMessageManager.cpp
index 4eebd1bc34b..e45e878687c 100644
--- a/content/base/src/nsFrameMessageManager.cpp
+++ b/content/base/src/nsFrameMessageManager.cpp
@@ -859,12 +859,6 @@ nsFrameScriptExecutor::DidCreateGlobal()
   }
 }
 
-void
-nsFrameScriptExecutor::DestroyCx()
-{
-  mGlobal = nullptr;
-}
-
 static PLDHashOperator
 CachedScriptUnrooter(const nsAString& aKey,
                        nsFrameJSScriptExecutorHolder*& aData,
diff --git a/content/base/src/nsFrameMessageManager.h b/content/base/src/nsFrameMessageManager.h
index 71dc772971b..5ee408b3da2 100644
--- a/content/base/src/nsFrameMessageManager.h
+++ b/content/base/src/nsFrameMessageManager.h
@@ -284,8 +284,6 @@ protected:
   ~nsFrameScriptExecutor()
   { MOZ_COUNT_DTOR(nsFrameScriptExecutor); }
   void DidCreateGlobal();
-  // Call this when you want to destroy mCx.
-  void DestroyCx();
   void LoadFrameScriptInternal(const nsAString& aURL);
   enum CacheFailedBehavior { EXECUTE_IF_CANT_CACHE, DONT_EXECUTE };
   void TryCacheLoadAndCompileScript(const nsAString& aURL,
diff --git a/content/base/src/nsInProcessTabChildGlobal.cpp b/content/base/src/nsInProcessTabChildGlobal.cpp
index ca39d918943..24df0424f80 100644
--- a/content/base/src/nsInProcessTabChildGlobal.cpp
+++ b/content/base/src/nsInProcessTabChildGlobal.cpp
@@ -246,9 +246,7 @@ nsInProcessTabChildGlobal::DelayedDisconnect()
 
   if (!mLoadingScript) {
     nsContentUtils::ReleaseWrapper(static_cast<EventTarget*>(this), this);
-    if (mGlobal) {
-      DestroyCx();
-    }
+    mGlobal = nullptr;
   } else {
     mDelayedDisconnect = true;
   }
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index bba5111f91a..8faac1828e1 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -1145,10 +1145,8 @@ TabChild::~TabChild()
     if (webBrowser) {
       webBrowser->SetContainerWindow(nullptr);
     }
-    if (mGlobal) {
-      DestroyCx();
-    }
-    
+    mGlobal = nullptr;
+
     if (mTabChildGlobal) {
       nsEventListenerManager* elm = mTabChildGlobal->GetListenerManager(false);
       if (elm) {