Did you know...
If your client only supports scrobbling to a single host but you'd like to scrobble to both Libre.fm and Last.fm you can configure Libre.fm to forward all of your scrobbles on to Last.fm for you. Simply visit the connections settings on your profile editing page.
Try Firefox Aurora
Firefox Aurora is the best way to try the latest and greatest additions to Firefox, before they're released to the general public.