Examine source code of Game RuneScape

{
  "theme": {
    "images": {
      "theme_frame": "my_persona.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "RuneScape Game",
  "manifest_version": 2,
  "description": "A RuneScape inspired persona",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b42aa7ff-1466-48ac-bda9-6620139dee46}"
    }
  }
}