But wait! Don’t go to mozilla.org quite yet! The older Firefox’s can update themselves remember 😉 . Just go into Tools -> Options… and look under the updates stuff. You’ll find a button to check for new updates which will get you the new version from the Automatic Update Service.
The great news for developers and testers, is that more focus will now go on trunk and the nightlies, get ready for new features galore! (I hope)