nix-config/home/common/desktop/firefox.nix

{ pkgs, ... }:
{
  home.packages = with pkgs; [
    fira
  ];
  programs.firefox = {
    enable = true;

    profiles = {
      "user" = {
        userChrome = ''
          * {
            font-family: "Fira Sans";
          }
        '';
      };
    };
  };
}