Examine source code of Kingdom Castle

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#d6d6d6",
      "tab_background_text": "#1f1f1f"
    }
  },
  "version": "2.0",
  "name": "Kingdom Castle",
  "manifest_version": 2,
  "description": "This is 3 images combined for this effect. Each one giving the image it's benefits to the viewer. The mountains, castle, and finally the cloud cover to give the castle a look of unreachable elevation."
}