Mozilla are still hard at work, today releasing Firefox 4 Beta 4 tot the public which is packed with several new features.
New in the latest release is Firefox Panorama, which lets you arrange and organise your tabs at the click of a mouse button.
Also new in this release is the inclusion of Firefox Sync, which syncs bookmarks, tabs, history and passwords between different computers you use. Previously this has been available as an add-on for Firefox, but as of now it is included directly with the browser.
Firefox 4 Beta 4 is available for Windows, Mac and Linux users right now. A full list of changes can be read in the release notes.