LINGUAS="de" having set, firefox and thunderbird both neatly install their German language pack. They even come with it enabled by default - however, all of the interface keeps speaking English to the linguistically ungifted. Not happy with this, simply dis-/enabling the language pack does not have any effect at all. After some head scratching it turns out there is one system setting responsible for this: $ cat /etc/env.d/02locale LANG="de_AT.UTF-8" LC_MESSAGES="en_GB.UTF-8" LC_COLLATE="C" Naturally, I don't want to have system messages in any other language than English, however it seems that firefox and thunderbird take that variable into account at startup. Taken from the URL, changing the following settings in about:config solved it for me: -general.useragent.locale;en-US +general.useragent.locale;de-AT -intl.locale.matchOS;true +intl.locale.matchOS;false I am not sure if there could be a sane default value for those that works for everyone. An elog message based on LINGUAS and LC_MESSAGE could suffice.
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