Firefox has been updated to version 3.5.
This version boasts of a few cool features, such as HTML5 Support and Geo-location. Get more details at
http://lifehacker.com/5295655/top-10-firefox-35-features
http://www.mozilla.com/en-US/firefox/3.5/releasenotes/

Check out this video of what HTML5 can do.
http://hacks.mozilla.org/2009/06/connecting-html5-video/

Of course, a version upgrade is never complete without breaking something. My upgrade listed the following extensions as incompatible. Hopefully, these extensions will get upgraded soon.

• Aardvark
• Current Site IP
• Evernote Web Clipper
• feedly
• Google Gears
• Google Notebook
• mediaplayerconnectivity
• PostRank
• Tab Mix Plus
• YSlow