[tor-bugs] #18597 [Quality Assurance and Testing]: Enhance performance timing tests for esr45

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#18597: Enhance performance timing tests for esr45
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     Reporter:  gk                             |      Owner:  boklm
         Type:  task                           |     Status:  new
     Priority:  Medium                         |  Milestone:
    Component:  Quality Assurance and Testing  |    Version:
     Severity:  Normal                         |   Keywords:  ff45-esr
Actual Points:                                 |  Parent ID:
       Points:                                 |   Reviewer:
      Sponsor:                                 |
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 We currently have tests for making sure the Navigation Timing and Resource
 Timing APIs are disabled. We should enhance these tests to make sure

 a) the `getEntries` methods are not working to get timing information back
 (done in the resource timing test)
 b) the Performance Observer
 (https://bugzilla.mozilla.org/show_bug.cgi?id=1165796) does not provide a
 way to get this data
 c) write a corresponding test for the User Timing API (we had #16336 for
 disabling the preference).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18597>
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