I use both, 'cos I'm the nazi at work who forces you to use Internet Explorer, and tells you what sites you can't see
Esentially it's the old story of 1/2 dozen of one, 6 of the other:
IE7I'm typing this through IE7 at the moment, I have Firefox on my laptop, but usually default to IE as it generally has less compatability issues.
IE7 has tabs same as Firefox
Hard to get rid of Microsoft default searches, brought to you by Microsoft.
IE7.com is a link page to Firefox
IE7 looks better than Firefox in Vista
FirefoxFirefox has a lot of cool add-ons, but you need to spend a bit of time to get common viewers working that come standard with IE.
Mac users love Firefox simply because Safari which comes with OS X is rubbish.
I agree, the "restore prevous sessions" is a great feature
Better in-page search functionality
It's not Microsoft