[tbb-bugs] #19689 [Applications/Tor Browser]: plugin prompt is parented to wrong window

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#19689: plugin prompt is parented to wrong window
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 Reporter:  mcs                       |          Owner:  mcs
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Major                     |     Resolution:
 Keywords:  TorBrowserTeam201607      |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by brade):

 Replying to [comment:3 gk]:
 > However, this feature seems to be broken on Linux (at least) in general
 as `xpcom-category-entry-added` does not seem to get fired and thus
 `torbutton_confirm_plugins()` is never called. Or did I miss something?
 That's the same issue for Windows I guess?

 We did not test on Linux but we did test on Mac OS and Windows. After
 applying our fix, the prompt was displayed on Windows. We will test on
 Linux. One confusing thing is that once the prompt is displayed, it is not
 displayed a second time until the browser is restarted (`xpcom-category-
 entry-added` does not fire a second time). I wonder if there is another
 ticket already open for that issue? It did not seem too important because
 the prompt was always displayed for us the first time plugins were enabled
 on Mac and Windows.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19689#comment:4>
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