[tbb-bugs] #26146 [Applications/Tor Browser]: Setting `general.useragent.override` does not spoof the platform part anymore in ESR 60 which is confusing

[Tor Bug Tracker & Wiki]

#26146: Setting `general.useragent.override` does not spoof the platform part
anymore in ESR 60 which is confusing
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 Reporter:  gk                        |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  ff60-esr                  |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Changes (by viktorj):

 * cc: viktor_jaegerskuepper@… (added)


Comment:

 This is also bad for anonymity. With Tor Browser 8.0a9 the results on
 panopticlick.eff.org look as expected, except for "Platform" and "User
 Agent" which reveal the OS (Linux in my case).

 There is also this Mozilla bug which is about not spoofing the platform
 because TCP/IP fingerprinting reveals the OS either way:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1409269

 But this should not be relevant for Tor Browser, as I understand it.

 I think this has to be fixed before Tor Browser 8.0 is released (hopefully
 even before that although it only affects the alpha channel at the
 moment).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26146#comment:4>
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