Examine source code of Darkening Leaves

{
  "theme": {
    "images": {
      "theme_frame": "AutumLeavesStillSecondEd.jpg"
    },
    "colors": {
      "frame": "#c2c1be",
      "tab_background_text": "#bab7b4"
    }
  },
  "version": "2.0",
  "name": "Darkening Leaves",
  "manifest_version": 2,
  "description": "The brown-red leaves that mark the summer's end and the rise of the powers of Winter..."
}