FireFox 3.5 has been released! 
http://www.mozilla.com/en-US/firefox/upgrade.html
If you want to see what is new before upgrading, check here:
http://en-us.www.mozilla.com/en-US/firefox/3.5/releasenotes/
http://www.mozilla.com/en-US/firefox/upgrade.html
If you want to see what is new before upgrading, check here:
http://en-us.www.mozilla.com/en-US/firefox/3.5/releasenotes/