For those of you who don't read Slashdot, but use Firefox or Mozilla, here's another, more in-depth look at the extensions available.
These do work if you have the full Mozilla install, yes? Or is it just for the streamlined Firefox only?
Well, probably a little bit of both. For the most part, extensions will work on either, but I've come across some that only work on Firefox. I would imagine that as Firefox becomes more mature and diverges from the Mozilla code more, that will happen more often.