I use Linux (Mandriva) & Windows XP, so I've tried many browsers on both sides of the fence. My favourite is Opera, with IE being a semi-close second, & Mozilla being third. I know Mozilla is now Seamonkey, but I still prefer the old Moz. As for Firefox, i was never impressed with that from the get go. Slow, clunky, not pretty at all unless you take the time to find a usable skin, takes a while to manually configure properly. Basically I always thought it was a dog, & I still do. Just my 2 pennies.
I did come across a very interesting website debunking the many myths about Firefox, in a fair & well documented manner. For those interested, it's
HERE. Give it a read if you find the time, it's quite informative.
Otis