Debian Linux (Squeeze) Install Firefox 4

My Debian Linux 6 (64 bit) has Epiphany installed which is the GNOME web browser. Epiphany aims to be simple to use and standards compliant but I want all other Firefox extensions. How do I install the latest version of Firefox 4 under Debian Linux version 6?

Debian Linux Project rebranded the Mozilla Firefox program as Iceweasel for Mozilla Firefox. It is almost same program. It can be installed easily using the apt-get or aptitude command line option. This program works with all Firefox add-ons such as ABP, Noscripts, and many other popular add-ons as Iceweasel is a fork of Firefox.

How Do I Install Iceweasel 4 Under Debian 6?

You need to add the following entry in /etc/apt/sources.list, enter:
# echo 'deb http://mozilla.debian.net/ squeeze-backports iceweasel-4.0' >> /etc/apt/sources.list
To type the following command:
# apt-get install -t squeeze-backports iceweasel
To start it, enter:
$ /usr/bin/firefox
OR
$ /usr/bin/iceweasel
You can visit Application > Internet > Iceweasel Web Browser to start the same from Gnome menu.

HowTo: Debian Linux Squeeze Install Iceweasel 4