[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)
-------------------------------------------------+-------------------------
 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:10 cypherpunks]:
 > So, that's due to Firefox doesn't recognize Win 10 renderer:
 > {{{
 > D3D11_COMPOSITING Blocklisted; failure code
 BLOCKLIST_FEATURE_FAILURE_UNKNOWN_DEVICE_VENDOR
 > }}}
 https://hg.mozilla.org/mozilla-
 central/file/06ee65d8ccdef77673ccc43098525565a11ce370/widget/windows/GfxInfo.cpp#l1415
 `Microsoft Basic Render Driver` is a system device, therefore it doesn't
 have `VendorID`.
 Vendor lock by Mozilla. What a shame!
 > that changes the fingerprint and triggers:
 > {{{
 > Error: WebGL warning: Disallowing antialiased backbuffers due to
 blacklisting.  canvas.js:180:11
 > }}}
 There is a strong opinion to disable it everywhere:
 https://bugzilla.mozilla.org/show_bug.cgi?id=809550
 > Forcing MSAA fixes that error, but doesn't change the fingerprint.
 Bad Mozilla. You need two:
 "To force-enable WebGL, go to about:config and set webgl.force-
 enabled=true.
 To force-enable WebGL anti-aliasing, go to about:config and set webgl
 .msaa-force=true."
 https://wiki.mozilla.org/Blocklisting/Blocked_Graphics_Drivers
 #How_to_force-enable_blocked_graphics_features
 to finally get `224a8abee799ec6381e06293de4565f6`.

 Related issues (still not fixed):
 https://bugzilla.mozilla.org/show_bug.cgi?id=1429587
 https://bugzilla.mozilla.org/show_bug.cgi?id=1383295
 https://bugzilla.mozilla.org/show_bug.cgi?id=1419111

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30537#comment:11>
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