Examine source code of Night leaves

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.jpg"
    },
    "colors": {
      "frame": "#171717",
      "tab_background_text": "#cfcfcf"
    }
  },
  "version": "2.0",
  "name": "Night leaves",
  "manifest_version": 2,
  "description": "From a long exposure night shot of a palm tree using a 250mm telephoto zoom lens. No photoshop effects used."
}