[Bug 1317012] [NEW] Firefox 28 doesn't use intl.accept_languages defined in syspref.js

[Cs-gon]

Public bug reported:

We have system-wide settings defined in /etc/firefox/syspref.js, amongst
others the intl.accept_languages option to define the accept languages
for our environment.

Firefox 28 (28.0+build2-0ubuntu0.12.04.1) doesn't use the accept
languages (and maybe others options) defined in syspref.js, when sending
the HTTP header, even though the intl.accept_language value shown in
about:config is correct (same as in syspref.js).

It only works, if the intl.accept_languages is defined as a lockPref in
syspref.js, which we don't want, because the users should be able to
customize the setting. But we need to explicitly set the "de-de" accept
language.

This worked in previous Firefox versions (e.g. 27 or older).


the corresponding line in syspref.js is:
pref("intl.accept_languages", "de-de,de,en-us,en");

about:config shows:
intl.accept_languages =        "de-de,de,en-us,en"

accept languages, which are sent in HTTP Header (this is the default from the firefox-locale-de package) :
"de,en-us,en"

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

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Title:
  Firefox 28 doesn't use intl.accept_languages defined in syspref.js

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