I use it.
Can't provide you with as comprehensive view as Fox, though.
I use "Firefox", and find it completely functional, as easy to use as IE 6.X, no problems.
Doesn't have the feature for HZ which allows the review of links, or should I say HZ doesn't have that feature which works with Firefox.
Otherwise, I guess it's a bit like the current Presidential election - it's not MS. That's enough.
By the way, I have both browsers on my machine, got used to Firefox slowly.
Good luck.
Arf