Hi i have the 3.0.1 version of firefox and cant seem to get the add ons working. I have downloaded one theme that works fine. But ive added add ons such as fast dial which either tell me after ive installed and restarted it, arnt compatible with my version even though it states they are or they add on but continue to say restart to complette installation even though i have already restarted. How do i fix this problem? Should i go back to using firefox 2?

install Nightly Tester Tools
this will give you override capability
once installed and Firefox re started you will see force compatibility or override compatibility

Ffx 3 has some problems in the add-ons department. I had several that I had to lose when I upgraded. Sometimes you have to use some tricks, such as uninstalling the add-ons, restarting Firefox, then reinstalling them. Note that some items will conflict with others. Themes seem to do this. What I have done is drop all themes and re-build my add-ons and see if they work. BTW, I'm using Fast Dial and Ffx 3 right now.