After a very long development phase, Mozilla has finally officially relased Firefox 4.0. The binaries were already up on the FTP sites yesterday, but today the release became official. Firefox 4.0 packs a heck of a lot of new features, including an entirely new user interface.
The interface has been entirely redone and looks nothing like Firefox 3.x. It’s not just skin-deep; new features have been added such as Panorama for easier tab management, searching for open tabs within the URL bar, and App Tabs, which allows you to pin websites as permanent tabs in your browsers (much like Chrome’s ‘pin’ feature).
There’s a lot more in Firefox 4, so I suggest you update your installation, or download the new version from Mozilla.