#4624 - Element hiding rules should not apply on whitelisted schemes (chrome://, file:/// etc.)

lib/elemHideFF.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 39 matching lines @@
 });
 
 port.on("getSelectorsForDomain", ([domain, specificOnly]) =>
 {
   let type = specificOnly ? ElemHide.SPECIFIC_ONLY : ElemHide.NO_UNCONDITIONAL;
   return ElemHide.getSelectorsForDomain(domain, type, true);
 });
 
 port.on("elemhideEnabled", ({frames, isPrivate}) =>
 {
-  if (!Prefs.enabled)
+  if (!Prefs.enabled || !Policy.isBlockableScheme(frames[0].location))
     return {enabled: false};
 
   let hit = Policy.isFrameWhitelisted(frames, true);
   if (hit)
   {
     let [frameIndex, contentType, docDomain, thirdParty, location, filter] = hit;
     if (!isPrivate)
       FilterStorage.increaseHitCount(filter);
     return {
       enabled: contentType == "GENERICHIDE",
@@ skipping 26 matching lines @@
 
   return {
     contentType: "ELEMHIDE",
     docDomain,
     thirdParty: false,
     location: filter.text.replace(/^.*?#/, '#'),
     filter: filter.text,
     filterType: filter.type
   };
 });