Examine source code of Cracked Earth

{
  "theme": {
    "images": {
      "theme_frame": "cracked-earth_header.jpg"
    },
    "colors": {
      "frame": "#f2e9e9",
      "tab_background_text": "#000221"
    }
  },
  "version": "2.0",
  "name": "Cracked Earth",
  "manifest_version": 2,
  "description": "Cracked earth from the badlands of South Dakota.  Snapshot by Doug Peters."
}