Tails 1.2.3 is the latest update of the distribution designed to preserve privacy and anonymity while browsing the Internet. Changes: upgrade to Linux 3.16.7; upgrade to Tor Browser 4.0.3 (based on Firefox 31.4.0esr); improve MAC spoofing fail-safe mechanisms, which includes preventing one more way the MAC address could be leaked; disable upgrade checking in the Unsafe Browser; fix startup of the Unsafe Browser in some locales; repair the desktop screenshot feature....

About Tails

The Amnesic Incognito Live System (Tails) is a Debian-based live CD/USB with the goal of providing complete Internet anonymity for the user. The product ships with several Internet applications, including web browser, IRC client, mail client and instant messenger, all pre-configured with security in mind and with all traffic anonymised. To achieve this, Incognito uses the Tor network to make Internet traffic very hard to trace.