Fallback to the top-level frame if we don't know the frame on Chrome

chrome/ext/background.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 445 matching lines @@
 
       // the high-level code isn't interested in top frame requests and
       // since those can only be handled in Chrome, we ignore them here
       // instead of in the browser independent high-level code.
       if (details.type == "main_frame")
         return;
     }
     else
       frameId = details.frameId;
 
-    // the high-level code relies on the frame. However in case the frame can't
-    // be controlled by the extension or the extension was (re)loaded after the
-    // frame was loaded, the frame is unknown and we have to ignore the request.
     if (!(frameId in frames))
-      return;
+    {
+      // the high-level code relies on the frame. So ignore the request if we
+      // don't even know the top-level frame. That can happen for example when
+      // the extension was just (re)loaded.
+      if (!(0 in frames))
+        return;
+
+      // however when the src of the frame is a javascript: or data: URL, we
+      // don't know the frame either. But since we know the top-level frame we
+      // can just pretend that we are in the top-level frame, in order to have
+      // at least most domain-based filter rules working.
+      frameId = 0;
+      if (details.type == "sub_frame")
+        frames[details.frameId].parent = frameId;
+    }
 
     var frame = new Frame({id: frameId, tab: tab});
 
     for (var i = 0; i < ext.webRequest.onBeforeRequest._listeners.length; i++)
     {
       if (ext.webRequest.onBeforeRequest._listeners[i](details.url, details.type, tab, frame) === false)
         return {cancel: true};
     }
   }, {urls: ["<all_urls>"]}, ["blocking"]);
 
@@ skipping 77 matching lines @@
       if (isContextMenuHidden)
         return;
 
       chrome.contextMenus.removeAll();
       isContextMenuHidden = true;
     }
   };
 
   ext.onMessage = new BackgroundMessageEventTarget();
 })();