Issue 4600 - Change CSS property matching to be case insensitive

chrome/content/cssProperties.js

 function splitSelector(selector)
 {
   if (selector.indexOf(",") == -1)
     return [selector];
 
   var selectors = [];
   var start = 0;
   var level = 0;
   var sep = "";
 
@@ skipping 77 matching lines @@
       if (rule.type != rule.STYLE_RULE)
         continue;
 
       var style = this.stringifyStyle(rule.style);
       for (var j = 0; j < this.patterns.length; j++)
       {
         var pattern = this.patterns[j];
         var regexp = pattern.regexp;
 
         if (typeof regexp == "string")
-          regexp = pattern.regexp = new RegExp(regexp);
+          regexp = pattern.regexp = new RegExp(regexp, "i");
 
         if (regexp.test(style))
         {
           var subSelectors = splitSelector(rule.selectorText);
           for (var k = 0; k < subSelectors.length; k++)
             selectors.push(pattern.prefix + subSelectors[k] + pattern.suffix);
           filters[pattern.text] = true;
         }
       }
     }
@@ skipping 27 matching lines @@
   apply: function()
   {
     if (this.patterns.length > 0)
     {
       var document = this.window.document;
       this.addSelectors(document.styleSheets);
       document.addEventListener("load", this.onLoad.bind(this), true);
     }
   }
 };