Mashable had a great write up on the Top 30 Firefox 3 Extensions. I agree with most of them and wanted to add a couple of my own.

I would list Mashable’s 30 but let’s be honest, I just don’t have the time. 🙂
Follow the link and read through them.

My top 5 FireFox Extensions:

FireGestures : mouse gestures to control functions in FireFox
Digg Ext: self-explanatory 🙂
GSpace : Awesome ext for using some of the 7GB of space you get on Gmail for file storage
Facebook Tool : Might as well be updated 24/7
Twitter Fox : Twitter me Firefox

Check them out. Download Firefox 3 if you haven’t already. It is pretty sweet.
If you want a run down of the entire Firefox 3 check out Doug Karr’s post here.