If you’re a Firefox browser user, you’ll be happy to know that while they haven’t officially announced it, Firefox 4 for the Mac is already available for download.

Firefox 4 brings a wealth of updates, including faster launch times, faster JavaScript engine, account syncing (for those with multiple Macs that want to keep their bookmarks and prefs in sync), tabs on top and tab pinning, and a host of under-the-hood updates.