Examine source code of age_of_empire2

{
  "theme": {
    "images": {
      "theme_frame": "Sanstitre1.jpg"
    },
    "colors": {
      "frame": "#e6e212",
      "tab_background_text": "#e8da15"
    }
  },
  "version": "2.0",
  "name": "age_of_empire2",
  "manifest_version": 2,
  "description": "for people who like the great game Age of Empire II"
}