Tor Browser Bundle Ubuntu PPA Web Upd8 : Ubuntu / Linux blog
▻http://www.webupd8.org/2013/12/tor-browser-bundle-ubuntu-ppa.html

Tor Browser Bundle is a web browser based on Firefox ESR (Firefox with extended support), configured to protect users’ privacy and anonymity by using Tor and Vidalia, tools that come bundled with it. The bundle also includes 4 Firefox extensions : TorButton, TorLauncher, NoScript and HTTPS-Everywhere.