[tor-bugs] #16285 [Applications/Tor Browser]: Make sure EME is no tracking risk in Tor Browser

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#16285: Make sure EME is no tracking risk in Tor Browser
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 Reporter:  gk                                   |          Owner:  gk
     Type:  task                                 |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, tbb-linkability,           |  Actual Points:
  GeorgKoppen201605, TorBrowserTeam201606        |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 There have been quite some changes in EME-land since esr45. macOS and
 Linux have now DRM support as well and it seems EME is treated differently
 build-wise: now it is only disabled by pref:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1300654. That might be
 related to clearkey getting built now even if we specify --disable-eme` in
 the .mozconfig file (adding exposure to security vulnerabilities:
 https://www.mozilla.org/en-US/security/advisories/mfsa2016-77/). And there
 is a different download path available in case AUS is down:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1267495.

 That's just mentioning the "top highlights". We need to have a close look
 at EME for esr52.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16285#comment:21>
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