The final release of Firefox 4 came out today. I'm currently giving it a little test drive, although I'm not really going to start using it. I use Opera (How cool am I?).
Also, at least according to Microsoft, when IE9 came out it was downloaded a total of 2.3 Million times in the firts 24 hours.I'm pretty confident Firefox 4 can beat that (just as a reference FF3 was downloaded 8 million times the day it came out).