[tbb-bugs] #26598 [Applications/Tor Browser]: disable User Timing API in ESR60

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#26598: disable User Timing API in ESR60
-------------------------------------+-------------------------------------
     Reporter:  mcs                  |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-fingerprinting-
     Severity:  Normal               |  time-
                                     |  highres,ff60-esr,TorBrowserTeam201806
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In #16336, we disabled the User Timing API by setting
 `odm.enable_user_timing` = `false`. Support for this pref was removed as
 of Firefox 55; see https://bugzilla.mozilla.org/show_bug.cgi?id=1344669.

 We should do patch Firefox to resurrect support for this pref or do
 something else to mitigate the fingerprinting potential of this feature.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26598>
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