[tbb-bugs] #26606 [Applications/Tor Browser]: investigate fingerprinting and linkability risks of the Intersection Observer API

[Tor Bug Tracker & Wiki]

#26606: investigate fingerprinting and linkability risks of the Intersection
Observer API
-------------------------------------+-------------------------------------
     Reporter:  mcs                  |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-fingerprinting,tbb-
     Severity:  Normal               |  linkability,ff60-esr,TorBrowserTeam201807
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 ​Support the Intersection Observer API was added was added during the
 ESR60 development cycle. This API "provides a way to asynchronously
 observe changes in the intersection of a target element with an ancestor
 element or with a top-level document's viewport." and may add linkability
 or fingerprinting risks. See:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1321865
  ​https://developer.mozilla.org/en-
 US/docs/Web/API/Intersection_Observer_API

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26606>
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