[tor-bugs] #10570 [TorBrowserButton]: allow PDF.js to access canvas (without warning dialog)

[Tor Bug Tracker & Wiki]

#10570: allow PDF.js to access canvas (without warning dialog)
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 Reporter:  cypherpunks       |          Owner:  mikeperry
     Type:  defect            |         Status:  new
 Priority:  minor             |      Milestone:
Component:  TorBrowserButton  |        Version:
 Keywords:                    |  Actual Points:
Parent ID:                    |         Points:
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 As noted by Mike Perry in a comment to ticket:7265#comment:6, the "site is
 trying to access canvas" warning is sometimes displayed when viewing a PDF
 file in-browser using PDF.js.

 As the warning is a false positive here (PDF.js can safely access the
 canvas without putting the user at the risk of fingerprinting), access to
 the canvas should be allowed without any prompt or warning.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10570>
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