Examine source code of Field Burning

{
  "theme": {
    "images": {
      "theme_frame": "0131-noyakimiru--ki-orange.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Field Burning",
  "manifest_version": 2,
  "description": "0131-noyakimiru--ki-orange\n0131futta-noyakimiru--ki-orange-sy"
}