Firefox 3.6 on Ubuntu Intrepid Ibex (8.10)

Here are the steps to install Firefox 3.6 on Ubuntu Intrepid Ibex (8.10)

1. sudo vi /etc/apt/sources.list


2. Add the following:
   deb http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu intrepid main
deb-src http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu intrepid main


3. Get the gpg key: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CE49EC21


4. Update apt-get: sudo apt-get update


5. Install firefox 3.6: sudo apt-get install firefox

For other versions of Ubuntu check here:
Ubuntugeek