Ubuntuzilla is a python script that allows the user to install (or upgrade to) the latest versions of Mozilla Firefox, Mozilla SeaMonkey, and Mozilla Thunderbird on Ubuntu Linux and derivative distros, with minimal disturbance to the system.
Open a Terminal (Applications->Accessories->Terminal) and copy+paste the following line:
sudo apt-get install libstdc++5 libnotify-bin
Download ubuntuzilla .deb package or Visit the download page for the latest version.
Run ubuntuzilla.py in command line by simply typing: ubuntuzilla.py in your Terminal.
Then it will show up the latest version of firefox, that is Firefox 3.5. Just follow the instructions (answer with y or n)
When you are prompted to choose the language of choice, if you dont know the one you want, just type 14 (Default en – US).
Thats it, reboot your system then goto Applications > Internet > Firefox , and you will have your latest frefox 3.5 up and running, and will even prompt you with latest updates (you can disable this feature anytime).
To uninstall:
Open a Terminal (Applications->Accessories->Terminal) and copy+paste the following line:
ubuntuzilla.py -a remove -p firefox
Only the mozilla build version of firefox that you just installed will be removed and your old Firefox version will be restored.