I’ve been using FireFox now, off and on, since March of this year. As a Mac user, I first tried it because it allowed me to work with Typepad’s java thingys for composing entries. For some reason, they didn’t work properly with Omniweb or Safari.
Slowly I have come to like it very much. It has not, as yet replaced OmniWeb (the mercedes of web browser’s as far as the Mac goes) as my favorite browser, but I call on it way more than Safari. The only drawback I can find is the lack of integration with the Mac’s system wide spellchecker. Otherwise it’s a great browser, and it’s cross platform.