stop using polipo in iceweasel

polipo has painful bugs, Tails has transparent Tor-ification and torified DNS resolution, and Torbutton 1.3.x has a "I’m using a transparent firewall-based torifying setup" => we could simply stop using polipo in Iceweasel right now.

But if we use the transparent proxy, then we don’t use our firewall as a fallback anymore but as the only stuff we rely on so the traffic goes to Tor. This doesn’t sounds safe.

So we decided to wait until we ship Iceweasel 5.0 or later, which fixes SOCKS support.

Side note: since we’re not willing to rely on the firewall only for transparent torification, applications that are not SOCKS-aware still need to be explicitly torified using the http_proxy -style environment variables, so we cannot entirely remove polipo from Tails.

done in Tails 0.10.

Original created by @tails on 5776 (Redmine)