Examine source code of Happy Halloween

{
  "theme": {
    "images": {
      "theme_frame": "HappyHalloweenH.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Happy  Halloween",
  "manifest_version": 2,
  "description": "Halloween, black cat, bat, raven, tree, full moon, dead tree, spider, scary, spooky,haunting, dark, My wallpaper to match is at: <a href=\"https://outgoing.prod.mozaws.net/v1/0c1257ebcc13825389d6d7630c7b4a34ee14dd6df6354554e7678acad6603860/http%3A//entertainment.desktopnexus.com/wallpaper/811650/\" rel=\"nofollow\">http://entertainment.desktopnexus.com/wallpaper/811650/</a>"
}