I tried Firefox for awhile last year. Gave it an honest try for about 2 weeks. Got so frustrated with things not working correctly and it being slow (On a brand new machine w/ 4 gig of RAM on Vista 64-bit), I just gave up. Uninstalled and went back to IE7. Life was good again. About a month ago I finally installed IE8 at home. I like it a lot. Don't see a lot of new feature over 7 other than now it will color code your tabs together and some of the menu are rearranged. I've now installed it at work as well because there is talk of deploying it here, so I thought I should start testing it with our application.