Examine source code of Mucha Summer

{
  "theme": {
    "images": {
      "theme_frame": "muchasummer.png"
    },
    "colors": {
      "frame": "#255250",
      "tab_background_text": "#291906"
    }
  },
  "version": "2.0",
  "name": "Mucha Summer",
  "manifest_version": 2,
  "description": "Alfons Mucha, Summer, 1896. Copyright has expired.\n\n\n<a href=\"https://outgoing.prod.mozaws.net/v1/e0c19705712076d55ad93b1ec172160c9f7b6622dee4fee8b5fe4f3d479d3391/http%3A//commons.wikimedia.org/wiki/File%3AAlfons_Mucha_-_1896_-_Summer.jpg\" rel=\"nofollow\">http://commons.wikimedia.org/wiki/File:Alfons_Mucha_-_1896_-_Summer.jpg</a>"
}