Examine source code of cold winter forest

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#afdce2",
      "tab_background_text": "#424141"
    }
  },
  "version": "2.0",
  "name": "cold winter forest",
  "manifest_version": 2,
  "description": "Image from iStockPhoto - <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/fa664873b5eac344f9a342bacf96b91f1a960afe93af9d623b845046cabb26d1/http%3A//www.istockphoto.com/stock-illustration-21989965-christmas-landscape-pattern.php\">http://www.istockphoto.com/stock-illustration-21989965-christmas-landscape-pattern.php</a>"
}