Version 6.0’s major new feature is the Permissions Manager, accessible by typing about:permissions into the Address bar. This allows you to set permissions regarding cookies, passwords, pop-up windows, offline storage and your location for individual websites you’ve previously visited, allowing you to grant more access to trusted sites without having to open yourself up to others in the process.
Version 6.0 also sees a raft of support for more HTML5 and CSS3 features, an improved about:memory dialog that allows you to manually rein in Firefox’s ever-increasing memory demands. As with the last two releases, performance is improved while developers also get to play with a “scratchpad” that allows live testing of Javascript code - access it from the Developers sub-menu or by hitting [Shift] + [F4].
Not all add-ons will work with this release (they’ll be automatically disabled during the update process), and because it’s an unfinished version, we recommend you back up your existing Firefox settings using a tool like MozBackup before installing it over the top of your existing stable installation.
Note that this is the portable edition of Firefox 6
