http://www.mozilla.com/en-US/firefox/3.0rc3/releasenotes/#whatsnew Reproducible: Always Steps to Reproduce:
Firefox 3.0 RC3 is different from RC2 only on Mac, but identical on Windows and Linux. See http://wiki.mozilla.org/Firefox3/StatusMeetings/2008-06-10 I guess RC2 will also become the final release :)
This one has the si langpack :P In CVS.