I am now finally starting to learn away from IE.
FireFox has added a few features that have caused me to want to stay...
Community created Addons, for one
The look and feel in the new BETA version
Abilities to customize the backend of FireFox
Better function of Tabs (eg: The X to close a tab doesnt disappear once you click off it)
Better History functions (abilities to open "Recently Closed Tabs" is one of my favorite)
And SPELL CHECK!
In fact, if it werent for spell check in FireFox, I wouldent even be using it.
I personally found that on this computer, IE7 loads faster than FireFox. I keep FireFox portable with me at all times just for the convenience of knowing Windows' "Remember my Password" wont start writing things down for me on a public computer, and I know my favorites will stay intact as well. (Oh, and ComputerHope logs in automatically without any hassle)