[tor-bugs] #30683 [Applications/Tor Browser]: Properties in dom/locales/$lang/chrome/ allow detecting user locale

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#30683: Properties in dom/locales/$lang/chrome/ allow detecting user locale
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-locale,           |  Actual Points:
  TorBrowserTeam201907                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by acat):

 > Have you checked whether the patch is a good upstreaming idea as-is? I
 wonder in particular if the en-US strings will always be available in, say
 fr, builds that don't come with fr lang packs.

 That's a very nice point, I missed this one. Indeed, Firefox localized
 builds do not have these, I only tested with language packs... Good that
 you realized before https://phabricator.services.mozilla.com/D35815
 landed, since it was accepted.

 I'm not sure what's the best way to make this upstreamable. I think it's
 not realistic to try to make the localized messages not accessible to web
 content, so I think making available these en-US locales in localized
 builds is the only way. I will take a look and try to see how difficult it
 is to do this, and update
 https://bugzilla.mozilla.org/show_bug.cgi?id=1561322. The approach is the
 same, so whatever is accepted in that bug should also apply here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30683#comment:7>
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