New comment by eoli3n on void-packages repository

https://github.com/void-linux/void-packages/issues/27255#issuecomment-748595035

Comment:
From https://firefox-source-docs.mozilla.org/intl/locale.html#requested-locales
> After the sanitization, the value will be stored in a pref intl.locale.requested.
> [...]
> - If the pref is not set at all, Gecko will use the default locale as the requested one.

It seems that PKGBUILD does this as shown in my previous comment: [Use LANG env var](https://github.com/archlinux/svntogit-packages/blob/packages/firefox/trunk/PKGBUILD#L153).
Void package fallback to [default locale](https://firefox-source-docs.mozilla.org/intl/locale.html#default-locale) (?) because no ``intl.locale.requested`` is set.
We can also read:
> If the developer wants to programmatically request the app to follow OS locales, they can assign null to requestedLocales.