[tor-bugs] #12684 [Firefox Patch Issues]: Make "Not Now" the default button for TorBrowser's canvas permission dialogue

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#12684: Make "Not Now" the default button for TorBrowser's canvas permission
dialogue
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     Reporter:  isis                 |      Owner:  isis
         Type:  defect               |     Status:  needs_review
     Priority:  critical             |  Milestone:
    Component:  Firefox Patch        |    Version:
  Issues                             |   Keywords:  tbb-usability, tbb-
   Resolution:                       |  linkability, MikePerry201408R,
Actual Points:                       |  TorBrowserTeam201408
       Points:                       |  Parent ID:
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Comment (by lunar):

 “HTML5 canvas” is a technical concept. Maybe it would be worth giving an
 example of when HTML5 canvas are useful past tracking users? I'm thinking
 of something like: ''Unless this website performs complex drawings (e.g. a
 game), you should not allow it to proceed.''

 But then, while I'm thinking about it, the current UI might be entirely
 wrong here. HTML5 canvas access should be blocked by default. A small
 warning should be displayed on the top of the page (like when NoScript
 blocks XSS), alongside an “Option” button where access can be allowed. “I
 can see the website does not work as it should, I need allow this thing
 that has been blocked.” And then I don't need to get a deep understanding
 of what “HTML5 canvases” are.

 But the recent changes are already improvements and the latter idea should
 probably belongs to a separate ticket.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12684#comment:33>
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