Examine source code of Orthohedron

{
  "theme": {
    "images": {
      "theme_frame": "hdorth.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Orthohedron",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Orthohedron” wallpaper. \n\n3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. \n\nWallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/b05f8b65f8e15da765d88e5f7d4f2640d598dbd853e8421126f0e64f0584d2db/http%3A//digitalblasphemy.com/preview.shtml%3Fi=orthohedron\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=orthohedron</a>"
}