In reply to @jtojnar:matrix.org
-(GNU/ℝτ)-: I am almost certain it has been fixed in nixpkgs in the past but cannot find the issue/PR in Nixpkgs

In reply to @jtojnar:matrix.org
-(GNU/ℝτ)-: for the devedition, please do

What should I put in this section?

Maintainer information:
# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:

In reply to @jtojnar:matrix.org
-(GNU/ℝτ)-: check who is maintainer of firefox-devedition

i18n = {
                defaultLocale = "en_US.UTF-8";
                extraLocaleSettings = {
                        LANGUAGE = "en_US:de_DE";
                        LC_TIME = "de_DE.UTF-8";
                        LC_MEASUREMENT = "de_DE.UTF-8";
                        LC_ADDRESS = "de_DE.UTF-8";
                        LC_PAPER = "de_DE.UTF-8";
                        LC_TELEPHONE = "de_DE.UTF-8";
                };
                supportedLocales = [
                        "en_US.UTF-8/UTF-8"
                        "de_DE.UTF-8/UTF-8"
                ];
        };