[tor-bugs] #30537 [Applications/Tor Browser]: WebGL fingerprint is different between Windows versions (and compared to non-Windows OSes)

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#30537: WebGL fingerprint is different between Windows versions (and compared to
non-Windows OSes)
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting, tbb-             |  Actual Points:
  fingerprinting-os                              |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:1 gk]:
 > comment:2:ticket:30531 reported `6992168724b997c74fc89f1e4a9301ce` (I
 guess that's a Windows 10 system?)
 Yes, the latest.
 > I got the same on a Windows 10 system inside Virtualbox.
 On every config without anti-aliasing support.
 > On a Windows 7 system both inside Virtualbox and on bare metal I get
 `224a8abee799ec6381e06293de4565f6`.
 BTW, the test gives a lot of
 {{{
 Error: WebGL warning: Exceeded 16 live WebGL contexts for this principal,
 losing the least recently used one.
 }}}
 > So, it seems we have at least a fingerprint difference between major
 Windows versions (+ the OS difference). I wonder where this is coming
 from...
 What is your renderer on Win 7? I got the same results on `Software
 Adapter Direct3D11 vs_5_0 ps_5_0`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30537#comment:2>
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