Mozilla Firefox 6 final is available for general public; however the official announcement yet to be done on August 16, 2011.
A band new page about:permissions is added to Firefox 6, which is similar to other Firefox internal pages like about:config etc. The page brings more control over privacy settings.
about:permissions is a Permissions Manager; lets user to configure passwords, locations, cookies, pop-ups, and offline storage access on a per-site basis and for all at once.
You can access this page by simply typing about:permissions in address bar.
Want to know about Mozilla Firefox? Check its Special URLs or Pages of Firefox.