I'm typing this post from my newly installed Firefox 2 Beta 1 Candidate which is available from Mozilla's FTP site. The UI hasn't changed much but they have now added a spell checker (though it doesn't know the word "Mozilla") as well as an Anti Phising option. I'm still working through the features at the moment but the install was pretty painless. Any Add-Ons that could be updated have, the rest are all disabled which has left me without the Web Dev Toolbar!