Firefox 2 is the next generation release of the award-winning Firefox web browser from Mozilla.
This update fixes several security issues and among that makes Firefox more resource friendly (i.e. less memory usage and maybe less CPU usage).
Download: Firefox 2.0.0.1
View: Fix List | Release Notes
Homepage: Mozilla
Amarjeet Rai's Blog 
Firefox 3 is going to be out soon !
Find your pick here :
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/?C=M;O=D