[tbb-bugs] #22659 [Applications/Tor Browser]: Changes to `intl.accept.languages` get overwritten after restart

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#22659: Changes to `intl.accept.languages` get overwritten after restart
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-7.0-issues, tbb-regression,      |  Actual Points:
  TorBrowserTeam201706, GeorgKoppen201706        |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 There is nothing obviously wrong with the logic. The same works in Tor
 Browser 6.5.x but in Tor Browser 7 doing
 {{{
 m_tb_prefs.clearUserPref("intl.accept_languages");
 }}}
 does not give us back the `intl.accept_languages` value which is in
 `chrome://global/locale/intl.properties` (in case one has a non-en-US
 bundle) but `en-US, en`. It's not clear yet where that new value is coming
 from.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22659#comment:1>
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