[tor-bugs] #21675 [Applications/Tor Browser]: Set window.navigator.hardwareConcurrency to a constant value

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#21675: Set window.navigator.hardwareConcurrency to a constant value
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-fingerprinting,
     Severity:  Normal               |  ff52-esr
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:  Sponsor4             |
-------------------------------------+-------------------------------------
 We should avoid leaking the amount of CPUs a user has available by asking
 `window.navigator.hardwareConcurrency`. Not sure which value we should
 give back and if we should return the same one for all users.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21675>
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