If you are already not convinced that firefox is better than everything out there, here are a few tips and tweaks that will make you want to switch. If you are using firefox, maybe you still didn't know about these.
Step 1: Getting Firefox
Just download and install firefox... Works with just about every operating system there is... But don't get the beta, there aren't as many themes and plugins for thosehttp://www.mozilla.com/en-US/firefox/