Examine source code of Happy Windmills

{
  "theme": {
    "images": {
      "theme_frame": "HappyWindmillsHCustom.jpg"
    },
    "colors": {
      "frame": "#080808",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Happy Windmills",
  "manifest_version": 2,
  "description": "Netherlands, Holland, wind mill, sky, trees, fence, grass, river, art, artistic, painting, nature, scenery. My wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/0334f036befdce6051dce5b8a35d77c9fc170c48a528611255f9fce511d4b649/http%3A//nature.desktopnexus.com/wallpaper/665533/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/665533/</a>"
}