[tor-bugs] #26529 [Applications/Torbutton]: TBA - Notify user about possible proxy-bypass before opening external app

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#26529: TBA - Notify user about possible proxy-bypass before opening external app
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     Reporter:  sysrqb                  |      Owner:  (none)
         Type:  defect                  |     Status:  new
     Priority:  High                    |  Milestone:
    Component:  Applications/Torbutton  |    Version:
     Severity:  Normal                  |   Keywords:  tbb-mobile
Actual Points:                          |  Parent ID:
       Points:                          |   Reviewer:
      Sponsor:                          |
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 igt0 and I already discussed this, but I don't see a ticket for this.
 Torbutton currently does this when the user asks Tor Browser to open a
 file. I doubt we can continue relying on `Ci.nsIHelperAppWarningDialog`
 for this, so we'll likely need another method for catching this action.

 I'm putting this into torbutton's component category for now, because that
 is where we catch this situation on desktop, but we may need to implement
 something directly within fennec, on mobile.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26529>
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