Mozilla is currently offering its Firefox 4 beta 2 browser to users who are keen to give it a test drive, and one of the more noticeable interface changes will be placing the tabs on top for the Mac users, something that was already offered to Windows users in the first beta. Another more interesting feature will be the inclusion of App Tabs, which allows users to flag a tab to be always available on the left, similar to Google Chrome’s Pin Tab feature. Startup times should also have been improved, and the rendering engine now recognizes CSS3 transition effects. The release is already available for Linux, Mac, and Windows PCs, so you’re free to give it a try, though Mozilla hasn’t committed to a specific launch date for the completed browser just yet. You can check out a video featuring App Tabs after the jump.
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