Examine source code of Winter Solstice

{
  "theme": {
    "images": {
      "theme_frame": "WinterSolstice_hd.jpg"
    },
    "colors": {
      "frame": "#56b7ea",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Winter Solstice",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Winter Solstice” wallpaper. 3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/2c2c58d5ac79c60bbfd264d4bf3a0f0e35979e17b3ec75f078ec97cb4e8c66bc/http%3A//digitalblasphemy.com/preview.shtml%3Fi=beneath1\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=beneath1</a>"
}