After over a year of development, FireFox 4 has been released to the masses. Check for updates in your existing FireFox installation, or head to http://getfirefox.com (http://getfirefox.com) to grab your copy.
Microsoft claimed that 2.4 million people downloaded the recent Internet Explorer 9 within the first 24 hours of availability, but Mozilla is already well ahead of that number just ~10.5 hours after today's release. You too can track the download stats (in near real-time!) over at http://glow.mozilla.com (http://glow.mozilla.com).
My own (extremely rudimentary, aka SunSpider (http://www.webkit.org/perf/sunspider/sunspider.html)) tests show JavaScript performance to be about 13% faster than Chrome 10 and 600% faster than its predecessor FireFox 3.6! IE9 is the leader however, coming in 10% faster than FF4. The Acid3 test is still only scoring 97/100, but it's still better than IE9's 95/100 and FF3.6's 94/100. Chrome wins the Acid test with a perfect 100/100. No matter which one you prefer, you have to love the competition in the browser market these days!
(http://www.firefox10.com/images/hot-firefox-girl.jpg)