Last.fm help

Hey I been a user for last.fm (A music site) for about 4 years and recently switched to Pandora, does any one who has last.fm and pandora Know of a good Scroobler for Last.fm for Firefox (as a ad-on) so that way I could be listening to pandora on firefox and it count on last.fm (If you are looking for one for Chrome I have a good one it is called Last.fm Scroobler) If you want to Compare tastes then click the link bellow.

http://www.last.fm/user/cool7023