Issue 5339 - Properly select element for pseudo-element

chrome/content/elemHideEmulation.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 271 matching lines @@
   *findPropsSelectors(styles, prefix, regexp)
   {
     let actualPrefix = (prefix && !incompletePrefixRegexp.test(prefix)) ?
         prefix + " " : prefix;
     for (let style of styles)
       if (regexp.test(style.style))
         for (let subSelector of style.subSelectors)
         {
           if (subSelector == "*")
             subSelector = "";
+          else
+          {
+            let idx = subSelector.lastIndexOf("::");
+            if (idx != -1)
+              subSelector = subSelector.substr(0, idx);
+          }
           yield actualPrefix + subSelector;
         }
   },
 
   *getSelectors(prefix, subtree, styles)
   {
     for (let selector of this.findPropsSelectors(styles, prefix, this._regexp))
       yield [selector, subtree];
   }
 };
@@ skipping 209 matching lines @@
 
       if (this.patterns.length > 0)
       {
         let {document} = this.window;
         this.addSelectors();
         document.addEventListener("load", this.onLoad.bind(this), true);
       }
     });
   }
 };