[tbb-bugs] #22396 [Applications/Tor Browser]: What does "never for this site" for the canvas warning really mean?

[Tor Bug Tracker & Wiki]

#22396: What does "never for this site" for the canvas warning really mean?
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     Reporter:  arma                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 When I get an html5 canvas warning in Tor Browser, it suggests that I pick
 "never for this site".

 To me, the word "never" implies that Tor Browser is writing down my
 answer, and it will use that answer forever after. Like the "permanent
 exceptions" for SSL certs.

 On the other hand, my understanding of Tor Browser behavior is that it
 wouldn't write it to disk, so my choice would be lost on the next browser
 reset or new identity click.

 There's a contradiction here. I'm assuming the second one is right. Is
 there a better phrase we can use than "never"?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22396>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online