Examine source code of MLP Fall

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "MLP Fall",
  "manifest_version": 2,
  "description": "A fall MLP persona based on this wallpaper: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/25c2fb5c8002f9c86053c3aec7b41289f4994d372e210a38d3bd7dc699ddba04/http%3A//fav.me/d6f9j13\">http://fav.me/d6f9j13</a>\n<i>MLP:FIM owned by hasbro</i>"
}