Issue 3828 - Ignore simulated clicks on abp:subscribe links

subscriptionLink.postload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 11 matching lines @@
 // whether variable ext exists before continuing to avoid
 // "Uncaught ReferenceError: ext is not defined". See https://crbug.com/416907
 if ("ext" in window && document instanceof HTMLDocument)
 {
   document.addEventListener("click", function(event)
   {
     // Ignore right-clicks
     if (event.button == 2)
       return;
 
+    // Ignore simulated clicks.
+    if (event.isTrusted == false)
+      return;
+
     // Search the link associated with the click
     var link = event.target;
     while (!(link instanceof HTMLAnchorElement))
     {
       link = link.parentNode;
 
       if (!link)
         return;
     }
 
@@ skipping 41 matching lines @@
     if (!/^(https?|ftp):/.test(url))
       return;
 
     ext.backgroundPage.sendMessage({
       type: "add-subscription",
       title: title,
       url: url
     });
   }, true);
 }