Examine source code of Asteroids Atari 2600

{
  "theme": {
    "images": {
      "theme_frame": "Asteroids-Header-2.jpg"
    },
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Asteroids Atari 2600",
  "manifest_version": 2,
  "description": "This is the old Atari video game Asteroids."
}