I like Enlightenment, and sometimes XFce. Both are small and very fast. Mostly for a browser I use Mozilla 0.9.9. Runs as fast as anything for me, and very stable. Hasn't crashed yet. I use Opera once in a while. But it takes forever to load, and it crashes for me once in a while.
Personally, for me Nautilus turns my awesome K6-2 350 (

) into a really good boat anchor. So I avoid it like the plauge.
I recommend upgrading your Mozilla to the latest milestone. But you will need to unistall your old version first then install the new version and you should be good to go.
OOPS!