these 4 derivations will be built:
  /nix/store/6nrrcrfc2m851b66vy7jdasmklbaln5m-hm-firefox-extensions.drv
  /nix/store/8iyrq6h22g6122yxd2xh2sfcb6i618y8-hm-firefox-extensions.drv
  /nix/store/njj4cz99xwqxj92h8j4bxymxy0yb4nxf-home-manager-files.drv
  /nix/store/kxd4jznkl5dvkn97m4939hisinplykhc-home-manager-generation.drv