Not thrilled by the recent release of Internet Explorer 9? Mozilla Firefox 4 is out of the gate today and already at nearly half a million downloads. Should you give it a try? Here’s some reasons you might want to. Firefox 4 will allow you to sync your browsing with all your mobile devices for constant surfing. The browser features a tab organization system, HTML 5 support, multitouch interactivity, 3D support, and up to six times faster browsing. Read our full Firefox 4 launch story for more details. Alternatively download the release candidate now from Firefox.