Examine source code of Halloween Haunt

{
  "theme": {
    "images": {
      "theme_frame": "22.png"
    },
    "colors": {
      "frame": "#fbcb4b",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Halloween Haunt",
  "manifest_version": 2,
  "description": "Download the matching Halloween wallpaper at <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/3bd6e0e30539604cdb82a0dd2a02a3a5fbd44bebc7b765dc29c11a847e5c2841/http%3A//wagooh.net/freebies/halloween-personas-with-matching-wallpaper\">http://wagooh.net/freebies/halloween-personas-with-matching-wallpaper</a>"
}