Tails 1.2 is released and announced by Tails developers bring with new feature and improvement. As we know, Tails is a live linux distribution based on debian and focused to preserve your privacy and anonymity. It helps you to use the Internet anonymously and circumvent censorship almost anywhere you go and on any computer but leaving no trace unless you ask it to explicitly.
One of the most important changes in this release is tails 1.2 not included Iceweasel Internet browser and it replaced with Tor Browser, which is based on the latest 4.0 release and Firefox 31.2 ESR. Also, all the applications of tails 1.2 now confined with Apparmor. The Linux kernel has been updated to version 3.16.5-1, and VirtualBox guest additions should now work by default, improving the performance of the OS in a virtual machine.
For more details read the Release notes of tails 1.2.