[tor-bugs] #30542 [Applications/Tor Browser]: Investigate fingerprinting capability of viewport API

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#30542: Investigate fingerprinting capability of viewport API
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 Reporter:  Thorin                               |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-resolution, tbb-  |  Actual Points:
  mobile, tbb-parity, ff68-esr                   |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor44-can
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Comment (by Thorin):

 FWIW, I added a keyboard and toolbar height PoC on TZP (it only shows if
 you're using android) .. and it is a bit wonky: it depends if I can catch
 the window size **with** the toolbar showing (which should happen with new
 content), but sometimes it doesn't (latency?). Once you scroll and the
 dynamic toolbar hides, I can calculate a relative height. Same if you
 click in the text box to start typing

 sysrqb had a plan for all this, but I haven't seen it yet. I'm concerned
 about keyboard height - I believe there's a lot of entropy there, and
 while it does require user gestures, it's not exactly easy for users to
 avoid using input fields. Maybe this needs it's own ticket?

 There's also differences for when you move to Fenix/GeckoView; e.g.
 - https://bugzilla.mozilla.org/show_bug.cgi?id=1514429
 - https://bugzilla.mozilla.org/show_bug.cgi?id=1523541

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30542#comment:13>
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