[tor-bugs] #26670 [Applications/Tor Browser]: Cannot allow Canvas Image Extract in tbb 8.0a9

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#26670: Cannot allow Canvas Image Extract in tbb 8.0a9
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 Reporter:  Ephraim                   |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  High                      |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  ff60-esr                  |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by Ephraim):

 Unfortunately not a public site, but any site using canvas extract should
 do it.
 for example this:

 https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_canvas_getimagedata

 the endless loop is just caused by the site I'm using is frequently using
 getImageData
 to scroll a graph, but as you can see on the w3schools page, the Allow
 option doesn't
 work, and the prompt appears again when you click the copy button again.

 So it's sufficient for testing

 And yes, in TBB 7.5 it just works fine. TBB 7.5 prompts, I select "Allow
 in the future" and it works and doesn't ask again for the current session
 (even though the very first getImageData was blocked anyway)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26670#comment:6>
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