Are you using Ubuntu and want to use the latest versions of Mozilla’s Firefox and Thunderbird? If you don’t want to wait for the Ubuntu repositories to be updated, you can use repositories straight from Mozilla. Check out the Ubuntu wiki for more information on installing the new versions of Mozilla Firefox and Thunderbird. The MozillaTeam also has a wiki page that lists all the Ubuntu packages.
For Hardy users, add the following repository to your /etc/apt/sources.list
deb http://ppa.launchpad.net/mozillateam/ubuntu hardy main universe
For Gutsy users, add the following repository to your /etc/apt/sources.list
deb http://ppa.launchpad.net/mozillateam/ubuntu gutsy main universe
For Feisty users, add the following repository to your /etc/apt/sources.list
deb http://ppa.launchpad.net/mozillateam/ubuntu feisty main universe
For Dapper users, add the following repository to your /etc/apt/sources.list
deb http://ppa.launchpad.net/mozillateam/ubuntu dapper main universe
If you use Gutsy or Hardy, simply install the ‘firefox-3.0‘ package to get the latest testing release of Firefox 3.0. Currently, the latest version is 3.0b3pre. The repositories also contain the latest official release of Thunderbird (2.0.0.12).
If you use an older version of Ubuntu, Feisty or Dapper, the repositories should at least have the latest stable version of Firefox and Thunderbird (2.0.0.12).

Once you have Firefox 3.0 installed, you will need to install Flash.
First make sure you have the Adobe Flash plugin installed, since it is not included with any version of Firefox.
sudo update-flashplugin
sudo apt-get install flashplugin-nonfree
The flashplugin-nonfree was made before the Firefox3 pre-releases, therefore, the only way to install Flash is to manually add it to the libraries. To do this, we will link the libraries from the default install location. This way, if you upgrade flashplugin-nonfree in the future, it will automaticaly be updated for Firefox 3.0 as well.
sudo ln -s /usr/lib/firefox/plugins/flashplugin-alternative.so /usr/lib/firefox-3.0b3/plugins/flashplugin-alternative.so
If you receive an error then you are probably using a different version of Firefox 3.0 and you will need to change this command. The best way to find out what this line should read is to navigate to /usr/lib/ and locate the firefox-3.0 folder. This folder name might be slightly different. Once you know the folder name, you can substitute it in the previous command for ‘firefox-3.0b3′. Once you have done this, close Firefox, reopen it and go to Adobe’s test site. This will test to ensure you successfully linked flashplugin-nonfree to Firefox 3.0.
Information on how to install Flash for Firefox 3.0 was taken from the following website.
If you use one of the older versions of Ubuntu and still want to have Firefox 3.0, try some of the following links.
Pictures were taken from the following website respectively:
http://www.library.drexel.edu/blogs/librarylog/firefox.jpg
http://static.howstuffworks.com
http://newtech.aurum3.com/images/firefox-3.jpg
http://www.basement.org/
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Written by Eric
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