Disable video statistics in Tor Browser
A commenter on our blog was complaining that we still have
media.video_stats.enabled set to
true (https://blog.torproject.org/blog/tor-browser-408-released#comment-92426). There is no need for this fingerprinting vector (a test (borrows from Chris Pearce) can be found on: https://people.torproject.org/~gk/misc/video-paint-stats.html) and Mozilla made this pref at least with having us in mind (see: https://bugzilla.mozilla.org/show_bug.cgi?id=654550 for the discussion).