// ==UserScript==
// @name          MZF No sid=
// @namespace     http://loucypher.wordpress.com/
// @include       http://forums.mozillazine.org/*sid=*
// @exclude       http://forums.mozillazine.org/posting.php*
// @description	  foo
// ==/UserScript==

location.replace(location.href.replace(/[\?|\&]sid\=\w+/, ""));