[tor-bugs] #16623 [Tor Browser]: Unify our external app blocker with Firefox's

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#16623: Unify our external app blocker with Firefox's
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 Reporter:  mikeperry                 |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  normal                    |      Milestone:
Component:  Tor Browser               |        Version:
 Keywords:  tbb-torbutton-conversion  |  Actual Points:
Parent ID:                            |         Points:
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 Firefox tries to prompt the user before opening external apps, but often
 fails. This is why we created the Torbutton external-app-blocker.js
 component. Can we unify this approach with the existing Firefox prefs for
 network.protocol-handler.warn-external.*?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16623>
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