[tbb-bugs] #13186 [Tor Browser]: performance.timing leak in ESR31

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#13186: performance.timing leak in ESR31
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 Reporter:  arthuredelstein               |          Owner:  tbb-team
     Type:  defect                        |         Status:  new
 Priority:  normal                        |      Milestone:
Component:  Tor Browser                   |        Version:
 Keywords:  ff31-esr, tbb-fingerprinting  |  Actual Points:
Parent ID:                                |         Points:
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 In ESR31, although we set `dom.enable_preformance` to false, I still see
 nonzero performance.timing properties: For example:

 {{{
 > performance.timing
 < PerformanceTiming { navigationStart: 0, unloadEventStart: 0,
 unloadEventEnd: 0, redirectStart: 1411030797789, redirectEnd:
 1411030797789,
 fetchStart: 1411030797789, domainLookupStart: 1411030797789,
 domainLookupEnd: 1411030797789, connectStart: 1411030797789,
 connectEnd: 1411030797789 }
 }}}

 I suppose this is a regression in Firefox.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13186>
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