[Bug 1755918] [NEW] Firefox 59 does not change UI language

Launchpad Bug Tracker 1755918 at bugs.launchpad.net
Thu Mar 15 15:56:54 UTC 2018

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Symptom: Since updating to Firefox 59, the Firefox UI items will be
English only. E.g. all items under Peferences. Switching from en_US to
de does no longer work.

The Firefox packages firefox, firefox-locale-en, firefox-locale-de are
installed. All 3 packages have been updated from 58.0.2 to 59.0 by the

When still on Firefox 58.0.2, the following settings existed and made sure my Firefox UI was localied to German (de)
intl.locale.matchOS=true (boolean, default)
general.useragent.locale=de (string, default)

After the update to Firefox 59.0 the second parameter is no longer set. It is simply not present any longer in about:config.
Adding it and restarting Firefox 59 does not have any effect.
The UI will remain English only and the parameter is gone.

This affects both Firefox packages:
firefox 59.0+build5-0ubuntu0.16.04.1
firefox 59.0+build5-0ubuntu0.14.04.1

Ubuntu releases:
Ubuntu 16.04.4 32-bit
Ubuntu 14.04.5 32-bit

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment
Firefox 59 does not change UI language
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