Examine source code of Luigi 2

{
  "theme": {
    "images": {
      "theme_frame": "FFThemeLuigi2.jpg"
    },
    "colors": {
      "frame": "#474747",
      "tab_background_text": "#6b6b6b"
    }
  },
  "version": "2.0",
  "name": "Luigi 2",
  "manifest_version": 2,
  "description": "Fixed version of Luigi 1. Better on smaller monitors."
}