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
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.