Add Tor post.

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+[Tor][] is an anonomizing proxy, see their list of [usage
+scenarios][use] if you want more details.  A basic Tor client is
+extremely easy to set up on Gentoo, just emerge `net-misc/tor`,
+possibly tweak the stock `/etc/tor/torrc`, and fire up the connection
+with
+
+    $ sudo /etc/init/tor start
+
+which (by default) opens a [SOCKS][]
+
+To use your new Tor "proxy" with Firefox, go to
+`Edit->Preferences->Advanced->Network->Connection->Settings->Manual
+proxy configuration` and set
+
+    SOCKS host: localhost
+    Port: 9050
+    Version: SOCKSv5
+
+To use remote DNS, enter `about:config` in the address bar, set the
+filter to `dns`, and set `network.proxy.socks_remote_dns` to `true` by
+double clicking.
+
+To disable cookies, which would allow the sites you're connecting to
+to track you as your exit IP changes, go to
+`Edit->Preferences->Privacy`, select `Firefox will: Use custom
+settings for history`, and make sure `Accept cookies from sites` is
+unchecked.
+
+To check that everything is properly configured, you can browse over
+to [Tor's check utility][check].
+
+[Tor]: https://www.torproject.org/
+[use]: https://www.torproject.org/about/torusers.html.en
+[SOCKS]: http://en.wikipedia.org/wiki/SOCKS
+[check]: https://check.torproject.org/
+
+[[!tag tags/linux]]
+[[!tag tags/tools]]