Examine source code of Future World City

{
  "theme": {
    "images": {
      "theme_frame": "Ciudad-del-futuro-2.jpg"
    },
    "colors": {
      "frame": "#eeff00",
      "tab_background_text": "#ddff00"
    }
  },
  "version": "2.0",
  "name": "Future World City",
  "manifest_version": 2,
  "description": "The citys will be like this."
}