Issue 5904 - Avoid include.preload.js running twice

include.preload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 506 matching lines @@
   }, true);
 
   document.addEventListener("load", event =>
   {
     let element = event.target;
     if (/^i?frame$/.test(element.localName))
       checkCollapse(element);
   }, true);
 }
 
-module.exports = {
-  checkCollapse,
-  elemhide,
-  typeMap,
-  getURLsFromElement
-};
+window.checkCollapse = checkCollapse;
+window.elemhide = elemhide;
+window.typeMap = typeMap;
+window.getURLsFromElement = getURLsFromElement;