Beyond the Sky

Ubuntu do not upgrade your firefox, at least until now still no update from my repository. Firfox released 2.0.0.1 which fix some security bugs, which I think is important. Luckly, you can download from firefox official website, and it works nice.

Pick your preferal language and download it from http://www.mozilla.com/en-US/firefox/all.html

For simple steps after download, you can do it with gnome terminal

sudo tar -zxvf firefox-2.0.0.1.tar.gz -C /opt/

Try out the new firefox first, check the version.

/opt/firefox/firefox

If it is working fine with all your data, now backup the old symlink and create a new symlink to your new firefox

sudo mv /usr/bin/firefox{,-old}
sudo ln -s /opt/firefox/firefox /usr/bin/firefox

If your firefox is not under /usr/bin, check it out where it come from

which firefox

Check whether is it symlink

ls -l `which firefox`

References:
Check out more command line examples at http://lne.blogdns.com/lbe
Symlink example - http://lne.blogdns.com/lbe/archives/19/how-to-create-symlink/
which example - http://lne.blogdns.com/lbe/archives/category/common/which/