Firefox 3.0rc1
I just installed the latest Firefox, and man am I happy. The previous beta version (5) was really leaking memory like a sieve. After upgrading to hardy heron (the latest version of Ubuntu), my hard drive was just going crazy. Thinking that I just needed more RAM (my laptop only has 512) just to have eclipse running with firefox and my email open, I went out and bought another GB. After upgrading to rc1 things are MUCH more responsive.