I have been using Firefox for a while now. I can't live without tabs. It's really nice and easy to add-on. The skins are fun to play with also. Pop-ups are rare and I didn't even have to install any add-ons for that! I've had no technical problems from it at all which is rare for my hodge-podge PC. I don't hate IE, I just love Firefox.
[EDIT] I just ran my website through the validator. It was full of errors! I had no idea! It's true about Frontpage. Unfortunatly I am horrible at manual HTML coding. Is there a better program for creating websites that won't have so many errors? I want to make sure my site is bug-free.