Your firefox is slow? Or crashs sometimes? And Safari doesn’t fit for you, maybe because of limited tab-browsing capabilities?

You may have heard of the brand new firefox 3. It is so new, it isn’t even released yet. So there are propably a lot of bugs. But give it a try. It will run faster than the curent version.

And you haven’t to remove firefox 2.
I just run into this little app, which helps you to install firefox 3 beta 5 in an easy way side by side with your beloved firefox 2(.0.0.14, I suppose) : http://www.dangerouslyawesome.com/2008/02/22/more-than-one-firefox-beta-to-rule-them-all-a-dave-martorana-concoction/

Or you could try it manualy with a little help of the terminal.app and this weblog
http://www.tech-recipes.com/rx/2828/os_x_install_firefox_2_firefox_3_same_computer

Windows users could follow this description
http://www.teamhackaday.com/forum/viewtopic.php?t=2843

I recommend to backup your bookmarks and your profil, just in case …

and at least the best: here is the bug tracker https://people.mozilla.com/~mconnor/PRD.html