[tbb-bugs] #15562 [Tor Browser]: SharedWorker (and probably ServiceWorker) violate first party isolation

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#15562: SharedWorker (and probably ServiceWorker) violate first party isolation
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 Reporter:  arthuredelstein  |          Owner:  tbb-team
     Type:  defect           |         Status:  new
 Priority:  normal           |      Milestone:
Component:  Tor Browser      |        Version:
 Keywords:  tbb-linkability  |  Actual Points:
Parent ID:                   |         Points:
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 Running a SharedWorker from an iframe allows passing of information via
 JavaScript between two websites. Here's a demo, where two tabs from
 different domains share uniquely identifying information. The first tab
 generates a random number, and the second tab displays the same random
 number.

 https://arthuredelstein.github.io/tordemos/sharedworker-parent.html

 I haven't looked at ServiceWorkers closely yet, but they appear to offer
 similar (possibly worse) ways to violate first party isolation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15562>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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