Issue 1587 - Escape curly brackets for elemhide filters

include.postload.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 10 matching lines @@
 var currentElement = null;
 var clickHideFilters = null;
 var highlightedElementsSelector = null;
 var clickHideFiltersDialog = null;
 var lastRightClickEvent = null;
 
 function escapeChar(chr)
 {
   var code = chr.charCodeAt(0);
 
-  if (code <= 0x1F || code == 0x7F || /\d/.test(chr))
+  // Control characters and leading digits must be escaped based on
+  // their char code in CSS. Moreover, curly brackets aren't allowed
+  // in elemhide filters, and therefore must be escaped based on their
+  // char code as well.
+  if (code <= 0x1F || code == 0x7F || /[\d\{\}]/.test(chr))
     return "\\" + code.toString(16) + " ";
 
   return "\\" + chr;
 }
 
 function quote(value)
 {
-  return '"' + value.replace(/["\\\x00-\x1F\x7F]/g, escapeChar) + '"';
+  return '"' + value.replace(/["\\\{\}\x00-\x1F\x7F]/g, escapeChar) + '"';
 }
 
 function escapeCSS(s)
 {
   return s.replace(/^[\d\-]|[^\w\-\u0080-\uFFFF]/g, escapeChar);
 }
 
 function supportsShadowRoot(element)
 {
   if (!("createShadowRoot" in element))
@@ skipping 620 matching lines @@
         break;
       default:
         sendResponse({});
         break;
     }
   });
 
   if (window == window.top)
     ext.backgroundPage.sendMessage({type: "report-html-page"});
 }