How to install firefox 4 to Ubuntu

Mozilla has released Firefox 4 for Windows, Linux and Mac.

Ubuntu 10.04 and 10.10 users can update by adding firefox-stable repository.

Copy and paste to terminal:

sudo add-apt-repository ppa:mozillateam/firefox-stable

sudo apt-get update && sudo apt-get upgrade

Or:

Ubuntu 10.04: System -> Administration -> Software Sources

Select Other Software and Add.

Ubuntu 10.10: System -> Administration -> Update Manager -> Settings -> Other Software -> Add

Write to the dialog: ppa:mozillateam/firefox-stable

Then update your system using Update Manager