1{ pkgs, user-pkgs, unstable-pkgs, ... }:
 2{
 3  programs.firefox.enable = true;
 4  programs.firefox.package = unstable-pkgs.firefox-devedition-bin;
 5
 6
 7  environment.systemPackages =
 8    (with pkgs; [
 9      vscode
10      nixpkgs-fmt
11      foot
12    ])
13    ++ [
14      user-pkgs.berkeley-mono
15      unstable-pkgs.nixd
16      unstable-pkgs.nixfmt-rfc-style
17    ];
18}