[tor-bugs] #16285 [Tor Browser]: Make sure EME is no tracking risk in Tor Browser based on ESR 38

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#16285: Make sure EME is no tracking risk in Tor Browser based on ESR 38
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 Reporter:  gk                         |          Owner:  gk
     Type:  task                       |         Status:  new
 Priority:  normal                     |      Milestone:
Component:  Tor Browser                |        Version:
 Keywords:  ff38-esr, tbb-linkability  |  Actual Points:
Parent ID:                             |         Points:
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 The EME architecture got uplifted to Firefox 37
 (https://bugzilla.mozilla.org/show_bug.cgi?id=1137045) in is included in
 ESR 38 as well. We should make sure there are no accompanying
 tracking/fingerprinting risks. The best plan is probably to disable EME as
 Mozilla is doing in its ESR 38 release. We may need a custom patch as
 Mozilla is basically enabling it
 {{{
 #if !defined(MOZ_UPDATE_CHANNEL) || MOZ_UPDATE_CHANNEL != esr
 }}}
 While we may want to take a deeper look at it when we switch to ESR 45 we
 should make sure that everything related to EME is really disabled if the
 respective prefs are set to `false`

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16285>
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