Maybe it's just me, but I will always prefer Firefox over any browser (have USED them all like they were my only browser). Been using Firefox since it's conception. I don't care about the little webpage real estate I lose with Firefox (just formatted, haven't had a chance to add my add-ons yet to make it sleeker than any browser out now)
But, here are my findings as of 2 minutes ago for the Acid3 test(all browsers up-to-date):
Chrome: 100
Opera: 100
Safari: 100
FF 3.6 & 4B: 97
IE8: 20
This leads me to believe that Microsoft is not in the "loop" with everyone else. Though knew about IE and the Acid test for quit some time now. But still can't believe to this day that they are that behind, considering it's Microsoft.
Though, still find it funny that for the past 6+ months, Mozilla hasn't been able to get a 100 rating, but it's close enough for me.
But, on the subject of IE, they are still behind everyone, even if this is a TRUE test of IE9.