Examine source code of Ducks Day

{
  "theme": {
    "images": {
      "theme_frame": "DuckDayHCustom.jpg"
    },
    "colors": {
      "frame": "#ccff99",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Ducks Day",
  "manifest_version": 2,
  "description": "ducks, duckling, flowers, butterfly, country, farm, green, nature, field, summer, spring. My wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/52cec1e68f59ac321200287301d0f7049fa21a4da02d1306bbe010a896a63e6b/http%3A//nature.desktopnexus.com/wallpaper/783779/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/783779/</a>"
}