```
  systemd.user.services.xssproxy = {
    Unit = {
      Description = "xssproxy";
      After = [ "graphical-session-pre.target" ];
      PartOf = [ "graphical-session.target" ];
    };

    Install.WantedBy = [ "graphical-session.target" ];
    Service.ExecStart = "${pkgs.xssproxy}/bin/xssproxy";
  };
```