It is a very nice browser. I've been a fan of the Mozilla project for a while. They make excellent products and they're free! Thunderbird is great...better than Mail.app in some respects, and Firebird is maturing nicely. I'm thinking Firebird might replace Camino as my new backup. I don't notice the huge speed gains you noticed, but it is very comparable on to Safari on my PB. And with the Pinstripe theme for Firebird, it makes the browser much more OS X-like. Kudos to the whole development team and the theme maker.