[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:  mcs
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff60-esr, tbb-fingerprinting-os,     |  Actual Points:
  tbb-8.0-issues, tbb-8.0.1-can                  |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by arthuredelstein):

 Replying to [comment:49 fufufu]:
 > Replying to [comment:47 arthuredelstein]:
 >
 > > Here is a pure CSS demo for detecting the OS:
 > > https://arthuredelstein.github.io/tordemos/os-detection-font-css.html
 >
 > I have a few extra addons in my Tor Browser (8.0) install, but this
 doesn't work for me even with all of them disabled and JS enabled. It
 simply displays all 3 OS names simultaneously. It makes no network
 requests beyond the initial page loading either.

 I guess this doesn't work if NoScript disables remote fonts at the highest
 security setting. Here's another approach that works in Tor Browser or
 Firefox without using remote fonts or JavaScript, at least where I was
 able to test:
 https://arthuredelstein.github.io/tordemos/media-query-font-detection.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26146#comment:53>
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