Currently Firefox 4.0b2 is the latest beta version of long awaited browser that is going beat Opera, Google Chrome as well as previous versions of Firefox in safety, speed and performance. There is a bunch of improvements which are already available for testing in Firefox 4 Beta 2 on Ubuntu: tabs on the top, crash protection, full webgl support, html5 video native support and many-many more. Now it is possible to install Firefox 4.0 Beta 2 in Ubuntu using PPA repository.
Go to Ubuntu main menu –> Accessories –> Terminal and type the following command there:
sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa sudo apt-get update
These commands adds new PPA repository to your system and reloads APT database of DEB packages available for installation. If you ever decide to unlink this repository you will need to delete this file: /etc/apt/sources.list.d/ubuntu-mozilla-daily-ppa-lucid.list.
In order to install latest beta of Firefox 4.0 from PPA execute the following command:
sudo aptitude install firefox-4.0
In a few minutes you will get Firefox 4.0b2 installed on your Ubuntu. Hit Ctrl + F2, type there firefox-4.0 and press enter to load Firefox 4.0: