Examine source code of Esca_future

{
  "theme": {
    "images": {
      "theme_frame": "eskff.jpg"
    },
    "colors": {
      "frame": "#616161",
      "tab_background_text": "#616161"
    }
  },
  "version": "2.0",
  "name": "Esca_future",
  "manifest_version": 2,
  "description": "エスカレーターが可愛かったので"
}