nixos-system-config/overlays/nixpkgs/firefox.nix

# Shamelessly stolen most parts from https://github.com/schizofox/schizofox

{ pkgs, ... }: final: prev: {
  firefox-esr = let
    sandboxed-firefox-esr = pkgs.mkNixPak {
      config = { sloth, pkgs, ... }: {
        app.package = pkgs.firefox-esr;
      };
    };
  in
    [sandboxed-firefox-esr];
}