[tor-bugs] #28371 [Applications/Tor Browser]: verify that speculative connect on mousedown does not violate FPI

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#28371: verify that speculative connect on mousedown does not violate FPI
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     Reporter:  mcs                  |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-
     Severity:  Normal               |  linkability,ff60-esr
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In Firefox 55, Firefox added code to speculatively connect when a user
 mousedowns over a link. We should verify that the early connection does
 not bypass first party isolation (if it does, it seems like we would have
 noticed by now... but we should double-check).

 See https://bugzilla.mozilla.org/show_bug.cgi?id=1348278

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28371>
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