[tor-bugs] #21778 [Applications/Tor Browser]: Canvas prompt is not showing up anymore in Tor Browser based in ESR52

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#21778: Canvas prompt is not showing up anymore in Tor Browser based in ESR52
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, tbb-7.0-must-alpha, tbb-   |  Actual Points:
  e10s, TorBrowserTeam201704R                    |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by arthuredelstein):

 Replying to [comment:5 mcs]:
 > It took a lot longer than we expected to find a working solution, but
 here is a fix for review:
 > https://gitweb.torproject.org/user/brade/tor-
 browser.git/commit/?h=bug21778-01&id=04b228b078c98cabedc0ccc179d627d693884a42

 Nice work! Looks good to me.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21778#comment:7>
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