984291 - Different intl.accept_languages values with user settings

Status: UNCONFIRMED

(Firefox :: Settings UI, defect)

Description

[Kai Raven]

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:27.0) Gecko/20100101 Firefox/27.0 (Beta/Release)

Steps to reproduce:

1. intl.accept_languages;en-US, en Status:default
2. cleared the values with the language preferences window Status: user set
3. Added the values again with the language preferences window, result:
intl.accept_languages;en-us,en Staus: user set
4. Reset the values in about:config, result as expected:
intl.accept_languages;en-US, en Status:default
5. Added 'de' with the language preferences window, result:
intl.accept_languages;de,en-us,en Staus:user set


Actual results:

The actual value for intl.accept_languages depends on what you do. Not good for browser fringerprinting issues.


Expected results:

I expect, that the value 'en-US' doesn't change. Either it is always 'en-US' or 'en-us', but not both.