[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-team
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Milestone:
Component:  Tor Browser         |        Version:
 Severity:  Normal              |     Resolution:
 Keywords:  tbb-fingerprinting  |  Actual Points:
Parent ID:                      |         Points:
  Sponsor:                      |
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Comment (by arthuredelstein):

 Replying to [comment:3 mcs]:
 > Replying to [comment:2 arthuredelstein]:
 > > I guess any third-party canvas extractions broken under (b) are also
 already broken by the current patch, unless that domain has previously
 been given permission as a first-party domain.
 >
 > Right, and that scenario seems unlikely.
 >
 > > This seems like an undesirable bit of linkability anyhow.
 >
 > Do you want to create a patch or should Kathy and I?

 I'm happy to give it a try, if you don't mind reviewing it. :) I'm going
 to attempt to rebase the canvas patch to mozilla-central but I'll wait
 until this fixup is settled.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17446#comment:4>
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