Issue 4684 - Allow { and } in attribute and property selectors

chrome/content/elemHideEmulation.js

 var propertySelectorRegExp = /\[\-abp\-properties=(["'])([^"']+)\1\]/;
 
 function splitSelector(selector)
 {
   if (selector.indexOf(",") == -1)
     return [selector];
 
   var selectors = [];
   var start = 0;
   var level = 0;
@@ skipping 119 matching lines @@
       {
         var pattern = patterns[i];
         var match = propertySelectorRegExp.exec(pattern.selector);
         if (!match)
           continue;
 
         var propertyExpression = match[2];
         var regexpString;
         if (propertyExpression.length >= 2 && propertyExpression[0] == "/" &&
             propertyExpression[propertyExpression.length - 1] == "/")
-          regexpString = propertyExpression.slice(1, -1);
+          regexpString = propertyExpression.slice(1, -1)
+              .replace("\\x7B ", "{").replace("\\x7D ", "}");
         else
           regexpString = filterToRegExp(propertyExpression);
 
         this.patterns.push({
           text: pattern.text,
           regexp: new RegExp(regexpString, "i"),
           prefix: pattern.selector.substr(0, match.index),
           suffix: pattern.selector.substr(match.index + match[0].length)
         });
       }
 
       callback();
     }.bind(this));
   },
 
   apply: function()
   {
     if (this.patterns.length > 0)
     {
       var document = this.window.document;
       this.addSelectors(document.styleSheets);
       document.addEventListener("load", this.onLoad.bind(this), true);
     }
   }
 };