Firefox 3.6.9 is a regular security and stability update to Firefox 3.6.x. The main focus will be to fix any OOPP issues found in the field and fix security issues after BlackHat. (…) Read the rest of How to install firefox 3.6.9 in Ubuntu 10.04 (Lucid) (30 words) © admin for Ubuntu Geek , 2010.
How to keep your Firefox release update on your Ubuntu based ditribution
sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
sudo apt-get update
sudo apt-get dist-upgrade
This will install latest version of firefox.