[tbb-bugs] #23104 [Applications/Tor Browser]: CSS line-height reveals the platform Tor Browser is running on

[Tor Bug Tracker & Wiki]

#23104: CSS line-height reveals the platform Tor Browser is running on
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-
                                          |  fingerprinting-os
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Dr. Neal Krawetz reported via HackerOne that it is possible to detect the
 platform a Tor Browser is running with the CSS `line-height` attribute:
 19px is used on Linux, 19.5167px on macOS, and 19.2px or 20px on Windows.

 We could think about adjusting that to 20px independent of the platform
 Tor Browser is running on.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23104>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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