Just a little gotcha with Tails - they have for some reason decided to enable Javascript; one does wonder if they have done so to help FBI?

You can configure your copies of Tor Browser Bundle however you want to. However, we recommend that even users who know how to use NoScript leave JavaScript enabled if possible, because a website or exit node can easily distinguish users who disable JavaScript from users who use Tor Browser bundle with its default settings (thus users who disable JavaScript are less anonymous).

Disabling JavaScript by default, then allowing a few websites to run scripts, is especially bad for your anonymity: the set of websites which you allow to run scripts is very likely to uniquely identify your browser.