Whoa, Nelly! Is that a Firefox 4 download button we're looking at? Why yes... yes it is! We can't think of a much better way to wrap up one's workday than by finding out that Mozilla's own Firefox browser has finally made the official leap to 4.0, with Beta 1 going live for the adoring public today. It's ready to be sucked down and installed for those with Windows, Linux and OS X-based machines, and the changelog itself is far too lengthy for this space (though it's linked below for your perusal). You'll obviously notice an overhauled look hitting you front and center, with a new add-on manager, support for the new WebM format, improved privacy settings and crash protection headlining the "big chart o' features." Give 'er a download and toss your thoughts on the new build down in comments below, cool?

P.S. - Be warned that this may very well not work with your stable of add-ons right away, so we'd keep that stable 3.x.x build installed as a backup!