Upgrade Firefox on Ubuntu

To upgrade Firefox to the 5.0 (or following) version on Ubuntu you can download the source files from here, you can install UbuntuZilla (an application that provides to upgrade Firefox automatically) or you can follow this instructions:

-open the command line
- type sudo apt-get update
- type sudo apt-get upgrade

I think it's the easier way to upgrade Firefox on Ubuntu because when I download Firefox's source files I didn't find the makefile and UbuntuZilla didn't run on my pc.

Bye, Dami