Examine source code of Ball 13

{
  "theme": {
    "images": {
      "theme_frame": "Gold3capov.Ball13scritta.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Ball 13",
  "manifest_version": 2,
  "description": "Palla, Biliardo, Tredici, Thirteen, Balls, Palle, Billiard, Billard, Boule, Boules, Treize"
}