Firefox 8 officially releases on Mozilla's site on November 8th, but technology blog GHacks discovered this morning that the Firefox 8.0 final version is already available for download for Windows, Mac and Linux on Mozilla's FTP servers.
The biggest new feature is that Firefox itself now handles third-party add-on installations to avoid security problems from sketchy extensions. Also included in the new version is built-in support to search Twitter messages in the browser's address bar.
Only a few of the normal Firefox mirror sites have version 8 available and the FTP servers will probably be hit hard between now and the official release on Tuesday. If you're not in a hurry you may want to wait for then.
Firefox 6 is a free download for Windows, Mac and Linux from Mozilla's FTP server at the link below.