Issue 5090 - Use user stylesheets for element hiding if possible

ext/background.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 590 matching lines @@
   chrome.runtime.onMessage.addListener((message, rawSender, sendResponse) =>
   {
     let sender = {};
 
     // Add "page" and "frame" if the message was sent by a content script.
     // If sent by popup or the background page itself, there is no "tab".
     if ("tab" in rawSender)
     {
       sender.page = new Page(rawSender.tab);
       sender.frame = {
+        id: rawSender.frameId,
         url: new URL(rawSender.url),
         get parent()
         {
           let frames = framesOfTabs[rawSender.tab.id];
 
           if (!frames)
             return null;
 
           let frame = frames[rawSender.frameId];
           if (frame)
@@ skipping 103 matching lines @@
   ext.windows = {
     create(createData, callback)
     {
       chrome.windows.create(createData, createdWindow =>
       {
         afterTabLoaded(callback)(createdWindow.tabs[0]);
       });
     }
   };
 }());