Rated 2 out of 5 stars
It does what it's supposed to do but it incredibly slows down my whole Firefox, especially switching to panels with some heavy page. I disabled all settings which were marked that they could affect performance but it didn't help. So bye bye. (Firefox 6, Linux)
I'm sorry your seeing this. Unfortunately with later versions of Firefox, things have gotten slower and slower.
It's in dire need of a rewrite, but I don't have time.