Examine source code of Walnut Grove

{
  "theme": {
    "images": {
      "theme_frame": "walnuthd1.jpg"
    },
    "colors": {
      "frame": "#e2c16c",
      "tab_background_text": "#f7e3af"
    }
  },
  "version": "2.0",
  "name": "Walnut Grove",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Walnut Grove” wallpaper. 3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/e970065c812c837fb3c69b607413b4d3676925802a277b3d6c36c20d93b45442/http%3A//digitalblasphemy.com/preview.shtml%3Fi=walnutgrove\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=walnutgrove</a>"
}