How to install firefox 7 stable in Ubuntu 11.10 = 10.10 = 10.04

Step by Step

1) First, uninstall your previous firefox:- 

Open Terminal ( Applications > Accessories > Terminal )

a)  sudo apt-get autoremove firefox

2) Then follow these command:
a)  sudo add-apt-repository ppa:mozillateam/firefox-stable

b)  sudo apt-get update

c)  sudo apt-get install firefox




So, Enjoy Lastes Firefox 7 ...................