Bug 1190093 - Stop throttling frame requests for loading pages by checking Hidden(), not isShowing. r=tnikkel

dom/base/nsDocument.cpp

@@ -3755,8 +3755,8 @@ nsIDocument::ShouldThrottleFrameRequests()
     return false;
   }
 
-  if (!mIsShowing) {
-    // We're not showing (probably in a background tab or the bf cache).
+  if (Hidden()) {
+    // We're not visible (probably in a background tab or the bf cache).
     return true;
   }