Firefox 8 is the abutting adaptation of Mozilla Firefox web browser. Mozilla aggregation congenital several PPAs for accepted and approaching Firefox versions.

The constant PPA contains accustomed adjustment of Firefox(current is firefox 7) and supports old versions of Ubuntu. Normally, the latest Ubuntu absolution auto-upgrade Firefox to the latest constant version.

The abutting PPA contains releases of Firefox from the beta channel. Now, we can get Firefox 8 from this ppa, but it will abate anterior installed verison. When Firefox 8 become stable, it should be abashed into constant ppa and I ahead it will be absence in abutting Ubuntu version.

So to install Firefox 8, add this ppa with following commands in terminal:

sudo add-apt-repository ppa:mozillateam/firefox-next
sudo apt-get update
sudo apt-get install firefox

The Firefox Aurora PPA contains builds of Firefox from the aurora channel, currently it is firefox 9. If you want to try it, you can add this ppa. But it will remove previous installed Firefox version.

The Daily build PPA contains packages for both Firefox and Thunderbird. Currently, they’re Firefox 11.0 alpha1 and Thunderbird 11.0 alhpa1(The package named 11.0, but it’s 10.0 in my installed about page). It’s an independent installation, it won’t remove previous installed Firefox verion.

You Can Ubuntu Guide http://ubuntuguide.net/wp-content/uploads/2011/11/Firefox-Aurora.png