Mozilla is currently on schedule to release Firefox 6 on August 16th but it looks like the final version has already been signed off and is unofficially available on Mozilla's servers.
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Mozilla is working on an accelerated release date for its Firefox browser which basically means we will see a new version of Firefox every six weeks. To put things in perspective, Mozilla released Firefox 4 on March 21st and Firefox 5 on June 18th. Mozilla plans to release Firefox 7 on September 27th.
So whats new in Firefox 6? Several noticeable changes are included including the highlighting of domain names in the browser's address bar and reduced start-up time when users rely on Panorama, which is the browser's multi-tab organizer. Firefox 6 is expected to bring better control over permissions, faster start-up times, faster performance in Linux, better plugin management, and HTML5 support. Firefox 6 Final does not bring any new changes to user interface but there are a ton of speed improvements compared to Firefox 5.
Since we are installing the final version of Firefox 6 before its official date, you will still see "Welcome to Firefox 6 beta" on the launch page. That page will be updated to reflect the final release soon enough.
Download Firefox 6.0 releases (http://www.mozilla.com/en-US/firefox/all-beta.html)