[tor-bugs] #23349 [Applications/Tor Browser]: Disable navigator.send_beacon().

[Tor Bug Tracker & Wiki]

#23349: Disable navigator.send_beacon().
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     Reporter:  yawning                   |      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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 The call: https://developer.mozilla.org/en-
 US/docs/Web/API/Navigator/sendBeacon

 The pref: `beacon.enabled`

 While this is briefly touched upon in #17718, it deserves separate
 discussion.

 This API runs counter to "Transparency in Navigation Tracking", and the
 HTML equivalent (`<a ping="...">`) is currently disabled
 (`browser.send_pings` is set to false by default even with standard
 Firefox).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23349>
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