April 26, 2013, 1:54 PM — Here's how you can install Firefox 21 in Linux Mint 14.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo apt-get install firefox
sudo add-apt-repository ppa:mozillateam/firefox-next
sudo apt-get update
sudo apt-get upgrade
For more, see the original article at the link below.