Using beta 4 now, started using FF3 around beta 2 I think. It's gotten quicker every update.
re add-ons: b4 is the first version of FF3 were IE tab works! It's a godsend at some ******** websites that fail to display properly in Firefox. Now, I could just boycott such sites, but unfortunately my Uni has a few important sites like that.
Now the only add-on I used that doesn't work yet is the Dutch dictionary. I can live without it anyway.