Examine source code of Butterfly Evening

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#0b6100",
      "tab_background_text": "#001c03"
    }
  },
  "version": "2.0",
  "name": "Butterfly Evening",
  "manifest_version": 2,
  "description": "Butterflies against an evening sky."
}