Examine source code of As Leaves Change

{
  "theme": {
    "images": {
      "theme_frame": "H.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "As Leaves Change",
  "manifest_version": 2,
  "description": "Fall, autumn, season, leaf, oak, maple, subtle, painted, sophisticated. The desktop wallpaper that will match this is at: <a href=\"https://outgoing.prod.mozaws.net/v1/e64f84ac485ad657c060b8de979c9f84b1c2f76d788b60e9b8a4564f8cb9bc78/http%3A//nature.desktopnexus.com/wallpaper/476590/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/476590/</a>"
}