Examine source code of Niflheim DB

{
  "theme": {
    "images": {
      "theme_frame": "hdnifheim.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Niflheim DB",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Niflheim” wallpaper.\n\n3D artwork by Ryan Bliss.\n\nPersona Designed by Mark Hamilton for Digital Blasphemy.\n\nWallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/94de82310555ce368a3afe5a0073c0e4e0dc34dbf66c54a197abbf4426e3d9cf/http%3A//digitalblasphemy.com/preview.shtml%3Fi=niflheim1\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=niflheim1</a>"
}