graylox you can keep old Firefox & run new if you like I do or get Firefox 5 now
http://www.mozilla.com/en-US/firefox/channel/
Mozilla Will Let You Try Out The Latest Firefox 5 Features Today -- Here's How To Get It
Welcome to theFuture of Firefox
Download and test the build that’s right for you
Aurora , Beta , Final Release.
http://download.cnet.com/2300-2137_4-10006754.html?tag=mncol;txt
Mozilla starts on Firefox 5 designs (screenshots)
Internet Explorer's Pinned sites are set to come to Firefox 5
Tweaking the menu for site-specific
Mozilla indicates here that the changes wrought by site-specific browsers will be deeper than the pinned site analog in Internet Explorer 9 we will do it better
Site-specific tools
Mozilla's site-specific browsers will offer tools such as direct links to your photos for Facebook or the Election section of CNN's site. As implemented in IE9
Search switches
The last of the feature previews from the Web site involves changing how the search bar looks, including color-coding searches based on the search provider's most desired color choice.
Perhaps most interesting about this development is that it indicates that Mozilla probably won't be getting rid of the search bar, as Google did in Chrome. Very Good.