Most of you out there have Firefox 3 and noticed some of your addons are not compatible? WTF?!?! Ah, but don’t panic. There’s a chance they are updated but just not on the Mozilla Addons site. You may have to go to the homepage of the developer of said addon. All you do is right-click and “Visit Home Page”.
Usually, they may have information about any FF3 updates or betas if not posted on the addon page.
One thing I read on Digg was that you can cheat by changing something in the about:config page. You could try that but they say it’s a big risk so… don’t do it.