A beta version of Firefox 4.0 has been released with a new look and new features It's been a while in the coming but a beta version of Firefox 4.0 is now out. The most noticeable changes to the browser are the interface ones. Although the interface changes are not available in all beta versions yet they are included in the Windows-specific release.
The latest Firefox 4.0 Beta 2 pre brings a long awaited feature: app tabs. This feature is very similar to the "Pin tab" option in Chrome: the app tabs use only favicons for the tabs and all the links you open from an app tab are opened to the right of all the app tabs.