[tor-bugs] #17446 [Tor Browser]: Canvas image extraction prompt logic

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#17446: Canvas image extraction prompt logic
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 Reporter:  arthuredelstein                      |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  Medium                               |         Status:  closed
Component:  Tor Browser                          |      Milestone:
 Severity:  Normal                               |        Version:
 Keywords:  tbb-fingerprinting,                  |     Resolution:  fixed
  PearlCrescent201511R, TorBrowserTeam201512R    |  Actual Points:
Parent ID:                                       |         Points:
  Sponsor:                                       |
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Comment (by mcs):

 See #17931 for a crash introduced by this fix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17446#comment:19>
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