[Bug 1527663] Re: firefox 43 Accept-Language header does not follow preferences

[Cs-gon]

This affect us too. Our accept languages are "de,en-US,en", as provided
by the firefox-locale-de package. The accept language configuration
shows up right in the configuration dialog in Firefox and in
about:config (intl.accept_languages), but still Firefox only sends "en-
US,en;q=0.5" in the HTTP header. This doesn't happen for all of our
users though. But I have not been able to find out any differences
between those installations/configurations yet.

It has something to do with the user profile, because when moving it away, and a new profile is generated the problem goes away, and when using the old profile again, the problem reappears. Though moving away/removing prefs.js does not make a difference. 
 
In the past this problem often occurred the first time Firefox was started after an update. But now it seems to stick for some users, so even after restarting Firefox many times, the problem still persists.

This might not seem like a big issue, but it is for us. The problem is
not only the language that is displayed, but also the other localization
(dates, time of day, decimal point, etc.), when entering data into web
GUIs, when printing, etc.. And this leads to all kinds of consecutive
faults, when users don't realize this.

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Title:
  firefox 43 Accept-Language header does not follow preferences

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