Install latest firefox in ubuntu......and stay upadted!!!

For ubuntu 9.04 or later

open a terminal and type

echo -e "\ndeb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main" | sudo tee -a /etc/apt/sources.list > /dev/null

Then add this key:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C1289A29

Then update:

sudo apt-get update

then run this command

sudo apt-get install firefox-mozilla-build

The best thing is that when ever a new version comes it updates automatically.

source:http://sourceforge.net/apps/mediawiki/ubuntuzilla/index.php?title=Main_Page#Installation