Issue 4230 - Don't disable element hiding if a generichide exception rule is present

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 32 matching lines @@
 
 port.on("elemhideEnabled", ({frames, isPrivate}) =>
 {
   if (!Prefs.enabled)
     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: false,
-      contentType, docDomain, thirdParty, location,
-      filter: filter.text, filterType: filter.type
-    };
+    if (contentType != "GENERICHIDE")
+    {
+      if (!isPrivate)
+        FilterStorage.increaseHitCount(filter);
+      return {
+        enabled: false,
+        contentType, docDomain, thirdParty, location,
+        filter: filter.text, filterType: filter.type
+      };
+    }
   }
-  else
-    return {enabled: true};
+
+  return {enabled: true};
 });