Examine source code of November Snow

{
  "theme": {
    "images": {
      "theme_frame": "november1.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "November Snow",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “November Snow” wallpaper. 3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/489d5103d22b4c22a714c563ef6d15d258ee59804c4f5a2ec1088d7127614241/http%3A//digitalblasphemy.com/preview.shtml%3Fi=novembersnow\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=novembersnow</a>"
}