Examine source code of Fearsome Floors

{
  "theme": {
    "images": {
      "theme_frame": "fearsome_floors_3000x200.jpg"
    },
    "colors": {
      "frame": "#4dfb4d",
      "tab_background_text": "#4dfb4d"
    }
  },
  "version": "2.0",
  "name": "Fearsome Floors",
  "manifest_version": 2,
  "description": "Based on the board game Fearsome Floors by Friedemann Friese"
}