Examine source code of poppyfield

{
  "theme": {
    "images": {
      "theme_frame": "poppy-1.jpg"
    },
    "colors": {
      "frame": "#f2baba",
      "tab_background_text": "#0d0436"
    }
  },
  "version": "2.0",
  "name": "poppyfield",
  "manifest_version": 2,
  "description": "Poppy field at Austria"
}