The first release candidate of the upcoming Mozilla Firefox 1.0 has now appeared on ftp.mozilla.org :-) There are now already packages in french, english, german, spanish, polish, czech, greek and norwegian available. This is just the current state :-)
Like with the PR old extensions are again disabled (with old I mean for example those that worked with the preview release ;-) ).
Edit: The extensions seem to work. There is just a message that you have old extensions installed.