is an internet browser based on Mozilla Firefox configured to protect the users’ anonimity, via Tor and Vidalia. The bundle also includes 3 Firefox extensions: Torbutton, NoScript and HTTPS-Everywhere.
The software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning your physical location, and it lets you access sites which are blocked.
Source Tor Homepage.
To install Tor just run the following commands via your systems Terminal.
sudo add-apt-repository ppa:webupd8team/tor-browser
sudo apt-get update
sudo apt-get install tor-browser
That's It EnJoy!