Examine source code of Windmills

{
  "theme": {
    "images": {
      "theme_frame": "windmillscropped2.jpg"
    },
    "colors": {
      "frame": "#cc1a1a",
      "tab_background_text": "#261e1e"
    }
  },
  "version": "2.0",
  "name": "Windmills",
  "manifest_version": 2,
  "description": "A row of Dutch Windmills"
}