diff --git a/extension/content/firebug/css/cssModule.js b/extension/content/firebug/css/cssModule.js
index 2a062914f1..ef1322fc7b 100644
--- a/extension/content/firebug/css/cssModule.js
+++ b/extension/content/firebug/css/cssModule.js
@@ -19,9 +19,7 @@ function(Firebug, Css, Events, Obj, Options, Xpcom, Module, CSSDirtyListener, Ed
 var Cc = Components.classes;
 var Ci = Components.interfaces;
 
-var reSplitCSS = new RegExp("(url\\((\\\")?.*?\\2\\))|(rgba?\\([^)]*\\)?)|(hsla?\\([^)]*\\)?)|" +
-    "(#[\\dA-Fa-f]+)|(-?\\d+(\\.\\d+)?(%|[a-z]{1,4})?)|\\\"([^\\\"]*)\\\"?|'([^']*)'?|" +
-    "([^,\\s\\/!\\(\\)]+)|(!(.*)?)");
+var reSplitCSS = /(url\((")?.*?\2\))|(rgba?\([^)]*\)?)|(#[\dA-Fa-f]+)|(hsla?\([^)]*\)?)|(-?\d+(\.\d+)?(%|[a-z]{1,4})?)|"([^"]*)"?|'([^']*)'?|([^,\s\/!\(\)]+)|(!(.*)?)/;
 var reURL = /url\((")?(.*)?\1\)/;
 var reRepeat = /no-repeat|repeat-x|repeat-y|repeat/;