[tor-bugs] #15563 [Applications/Tor Browser]: ServiceWorkers violate first party isolation, probably

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#15563: ServiceWorkers violate first party isolation, probably
-------------------------------------------------+-------------------------
 Reporter:  arthuredelstein                      |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-linkability, ff68-esr, tbb-9.0   |  Actual Points:
  -must-alpha                                    |
Parent ID:                                       |         Points:  1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor44-can
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Changes (by acat):

 * status:  new => needs_information


Comment:

 AFAIK, service workers APIs should not be usable in private browsing mode,
 `navigator.serviceWorker` is not present in that case. So in mobile they
 have flipped the serviceworker pref but as long as we only have private
 windows it should not be usable. Should we still investigate this for
 `browser.privatebrowsing.autostart = false`?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15563#comment:18>
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