Greasemonkey script for filtering out results from experteer.com
If you want to maximize the speed, to iterate big arrays, use

for (var i = 0, l = array.length; i &lt; l; i++)


instead of

for (var i = 0; i &lt; array.length; i++)


Moreover, if you want to get the elements of a class, there's no need to use querySelectorAll, you can use the faster getElementsByClassName (see benchmark)