Today I downloaded my copy of Firefox version 3. After installation most of my Add-ons and all of my themes got out of order with newer version compatibility issues. Ya it needs some time to get all stuff up to date. The interface changes are cool in new version.
Have you tried new Firefox 3?
RC Download: http://www.mozilla.com/en-US/firefox/all-rc.html
Download records: http://www.spreadfirefox.com/en-US/worldrecord/
Release notes: http://www.mozilla.com/en-US/firefox/3.0rc3/releasenotes/