Note: this post is from 2007, outbound links may be broken.
Lifehack’s Top 10 Firefox Extensions
Lifehack has a list of the Top 10 Firefox extensions to improve your productivity.
Out of these 10 I just use 3 (FlashGot, FlashBlock and Tab Mix Plus) but I think I’ll give some of the others a try as well.
Download Statusbar looks useful to me