Issue 5760 - Use relative require paths

lib/utils.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 46 matching lines @@
     return this.readingDirection;
   },
   generateChecksum(lines)
   {
     // We cannot calculate MD5 checksums yet :-(
     return null;
   },
 
   getDocLink(linkID)
   {
-    let docLink = require("prefs").Prefs.documentation_link;
+    let docLink = require("./prefs").Prefs.documentation_link;
     return docLink.replace(/%LINK%/g, linkID)
                   .replace(/%LANG%/g, Utils.appLocale);
   },
 
   yield()
   {
   }
 };