Issue 1428 - Disable "Block Element" on non-HTML pages

popup.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 15 matching lines @@
 var isWhitelisted = require("whitelisting").isWhitelisted;
 
 var page = null;
 
 function init()
 {
   ext.pages.query({active: true, lastFocusedWindow: true}, function(pages)
   {
     page = pages[0];
 
-    // Mark page as local to hide non-relevant elements
+    // Mark page as 'local' or 'nohtml' to hide non-relevant elements
     if (!page || !/^https?:\/\//.test(page.url))
       document.body.classList.add("local");
+    else if (!backgroundPage.htmlPages.has(page))
+      document.body.classList.add("nohtml");
 
     // Ask content script whether clickhide is active. If so, show cancel button.
     // If that isn't the case, ask background.html whether it has cached filters. If so,
     // ask the user whether she wants those filters.
     // Otherwise, we are in default state.
     if (page)
     {
       if (isWhitelisted(page.url))
         document.getElementById("enabled").classList.add("off");
 
@@ skipping 75 matching lines @@
   document.body.classList.remove("clickhide-active");
   page.sendMessage({type: "clickhide-deactivate"});
 }
 
 function toggleCollapse(event)
 {
   var collapser = event.currentTarget;
   Prefs[collapser.dataset.option] = !Prefs[collapser.dataset.option];
   collapser.parentNode.classList.toggle("collapsed");
 }