You can try FireFox Beta here. I downloaded firefox-4.0b9.tar.bz2 and ran a few of commands:
tar xf firefox-4.0b9.tar
and voila! FireFox was running quite nicely. Very crisp.
I visited a few sites and found everything worked as needed. I was using it in a virtual machine and found it quite crisp. It still lacks the combined address/search box of Chrome Browser which saves me a click often enough.
According to one source, Beta9 fixed 661 bugs. It looks pretty good to me at the moment. It’s good to have multiple browsers available.
Congratulations to Mozilla for really tuning things up. FF4 is a great browser.