It does seem to be rather fashionable to slate Firefox at the moment.

I've tried using Chrome and Safari 4 but have gone back to Firefox (on mac). It looks fine on a mac with the GrApple themes Fission and the PDF Plugin. The addons I use are few genuinely useful (lasttab, FireGestures).

Safari still doesn't even remember the tabs I had open last time.

I'm all for competition though, I just don't think that it necessarily means that Firefox will disappear. IE still has by far the largest share of the market.