Userscripts.org

According to jeanc, Firefox 2.x doesn't support getElementsByClassName. You can make the script compatible with it by implementing this method yourself:

document.getElementsByClassName = function (cl)
{
	var retnode = [];
	var myclass = new RegExp ('\\b' + cl + '\\b');
	var elem = this.getElementsByTagName ('*');
	for (var i = 0; i < elem.length; i++)
		if (myclass.test (elem [i].className))
			retnode.push (elem [i]);
	return retnode;
}