uhm, I have tested out Firefox 3. However, I would recommend not to get it yet. Considering over 89% of the sites are still using Firefox 2 standard coding... So, many of the sites won't be functioning well. o.o" It's fine if you want to test it out; however, I think it's going to take at least end of the year...
i haven't had any major problems with rc1 and i expect that the final version will have eliminated a number of the smaller problems with the addons. I really haven't had problems with any sites any more so than with firefox 2.
Currently, there's only few addons released for version 3.... uhm, visit some sites that are flash based or javascript based ones and you will understand it. o.o"
flash now works on fire fox 3 rc1 (just a little slow on sights that are entirely flash, but that could just be my crappy computer) and the addons are increasing by the day
what is a JavaScript based sight i can test it on?