[tbb-bugs] #21657 [Applications/Tor Browser]: Test to make sure we isolate or disable all speculative connects

[Tor Bug Tracker & Wiki]

#21657: Test to make sure we isolate or disable all speculative connects
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     Reporter:  arthuredelstein           |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 There are a variety of speculative connect features in Tor Browser that we
 want to make sure are isolated by first-party or disabled. These include
 {{{
   link rel=preconnect
   link rel=prefetch
   link rel=prerender
 }}}
 and possibly more.
 We should test this for the ESR45 and ESR52 versions of Tor Browser,
 because isolation will have different mechanisms.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21657>
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