I've been using FireFox 0.8 and 1.0 (pre release or whatever it was called) from time to time, but to tell the truth, I still preferr Netscape. As far as I know, and barring the update button, I think it is more complete than FireFox (Composer, Mail client, even a built-in chat client) the only thing I do not like is AOL IM, but I do not use it and it does not bother me. Both are based on Mozilla, so you have the same other basics, like tabbed navigation, background loading of tabs, etc.