--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -12395,24 +12395,22 @@ nsGlobalWindow::GetScrollFrame()
   if (presShell) {
     return presShell->GetRootScrollFrameAsScrollable();
   }
   return nullptr;
 }
 
 nsresult
 nsGlobalWindow::BuildURIfromBase(const char *aURL, nsIURI **aBuiltURI,
-                                 bool *aFreeSecurityPass,
                                  JSContext **aCXused)
 {
   nsIScriptContext *scx = GetContextInternal();
   JSContext *cx = nullptr;
 
   *aBuiltURI = nullptr;
-  *aFreeSecurityPass = false;
   if (aCXused)
     *aCXused = nullptr;
 
   // get JSContext
   NS_ASSERTION(scx, "opening window missing its context");
   NS_ASSERTION(mDoc, "opening window missing its document");
   if (!scx || !mDoc)
     return NS_ERROR_FAILURE;
@@ -12443,47 +12441,49 @@ nsGlobalWindow::BuildURIfromBase(const c
   if (cx) {
     nsIScriptContext *scriptcx = nsJSUtils::GetDynamicScriptContext(cx);
     if (scriptcx)
       sourceWindow = do_QueryInterface(scriptcx->GetGlobalObject());
   }
 
   if (!sourceWindow) {
     sourceWindow = this;
-    *aFreeSecurityPass = true;
-  }
-
-  if (sourceWindow) {
-    nsCOMPtr<nsIDocument> doc = sourceWindow->GetDoc();
-    if (doc) {
-      baseURI = doc->GetDocBaseURI();
-      charset = doc->GetDocumentCharacterSet();
-    }
+  }
+
+  nsCOMPtr<nsIDocument> doc = sourceWindow->GetDoc();
+  if (doc) {
+    baseURI = doc->GetDocBaseURI();
+    charset = doc->GetDocumentCharacterSet();
   }
 
   if (aCXused)
     *aCXused = cx;
   return NS_NewURI(aBuiltURI, nsDependentCString(aURL), charset.get(), baseURI);
 }
 
 nsresult
 nsGlobalWindow::SecurityCheckURL(const char *aURL)
 {
   JSContext       *cxUsed;
-  bool             freePass;
   nsCOMPtr<nsIURI> uri;
 
-  if (NS_FAILED(BuildURIfromBase(aURL, getter_AddRefs(uri), &freePass, &cxUsed)))
+  if (NS_FAILED(BuildURIfromBase(aURL, getter_AddRefs(uri), &cxUsed))) {
     return NS_ERROR_FAILURE;
+  }
+
+  if (!cxUsed) {
+    return NS_OK;
+  }
 
   AutoPushJSContext cx(cxUsed);
 
-  if (!freePass && NS_FAILED(nsContentUtils::GetSecurityManager()->
-        CheckLoadURIFromScript(cx, uri)))
+  if (NS_FAILED(nsContentUtils::GetSecurityManager()->
+        CheckLoadURIFromScript(cx, uri))) {
     return NS_ERROR_FAILURE;
+  }
 
   return NS_OK;
 }
 
 void
 nsGlobalWindow::FlushPendingNotifications(mozFlushType aType)
 {
   if (mDoc) {

--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -1165,19 +1165,18 @@ protected:
   void InsertTimeoutIntoList(nsTimeout *aTimeout);
   static void TimerCallback(nsITimer *aTimer, void *aClosure);
 
   // Helper Functions
   already_AddRefed<nsIDocShellTreeOwner> GetTreeOwner();
   already_AddRefed<nsIBaseWindow> GetTreeOwnerWindow();
   already_AddRefed<nsIWebBrowserChrome> GetWebBrowserChrome();
   nsresult SecurityCheckURL(const char *aURL);
-  nsresult BuildURIfromBase(const char *aURL,
-                            nsIURI **aBuiltURI,
-                            bool *aFreeSecurityPass, JSContext **aCXused);
+  nsresult BuildURIfromBase(const char *aURL, nsIURI **aBuiltURI,
+                            JSContext **aCXused);
   bool PopupWhitelisted();
   PopupControlState RevisePopupAbuseLevel(PopupControlState);
   void     FireAbuseEvents(bool aBlocked, bool aWindow,
                            const nsAString &aPopupURL,
                            const nsAString &aPopupWindowName,
                            const nsAString &aPopupWindowFeatures);
   void FireOfflineStatusEvent();