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

Wed Sep 12 23:00:53 UTC 2018

#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:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff60-esr, tbb-fingerprinting-os,     |  Actual Points:
  tbb-8.0-issues                                 |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by arthuredelstein):

 Replying to [comment:40 tom]:
 > Replying to [comment:37 fufufu]:
 > >  I can only find a small reference in Whonix documentation to
 detecting fonts via "CSS introspection". Can gk or somebody else provide
 more information about how this works?

 > A CSS trick to do this would be something like
 https://arthuredelstein.github.io/tordemos/media-query-fingerprint.html
 but I bet you can d the same in canvas and in SVG.

 Here is a pure CSS demo for detecting the OS:
 https://arthuredelstein.github.io/tordemos/os-detection-font-css.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26146#comment:47>
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