To install Firefox 3.1 beta 3pre in Ubuntu, first you need to add a new repository. To do so, go to System > Administration > Software Sources, to the Third-Party Software tab and add this repository:

To install it for Ubuntu Intrepid, add the following repository (System > Administration > Software Sources, Third Party Software tab, click "Add"):

To install Firefox 3 RC1 on Ubuntu Hardy, go ti System > Administration > Software Sources. Then go to Third-Party Software, click Add, and add this (auto install):

If you don’t want to wait until Banshee 1.0 is added to Gutsy/Hardy repositories, just add this to your software sources (System > Administration > Software Sources -> Third-Party Software and click Add), for Hardy:

One of the best ways to get updated software for Debian-based distros, is from GetDeb.net. They’ve recently launched an updated site for users of Ubuntu 9.04 and newer, and one of the great new benefits is that they now have a repository you can add to your sources.list.

Ailurus is a system enhancement application. It helps to install software which is outside official repository. It helps to add/remove third party repositories, and to change system settings.

This guide explains several methods on installing the latest Firefox in Ubuntu, including installing it from a PPA repository.

I. Install Firefox from the Firefox PPA repository
1. The CLI (command-line interface) way
This is probably the easiest method. Don't forget to read the Creating a new profile section below after installing Firefox.

The latest Firefox build, Firefox 3.6.2 is released. And Ubuntuzilla Repository is the easiest way to install Firefox 3.6.2 in Ubuntu. Let's get started.

The unofficial third party repository Debian Multimedia stopped using the domain debian-multimedia.org some months ago. The domain expired and it is now registered again by someone unknown to Debian. If you're still using this repository, then that unknown party has full access to your Debian system!