Examine source code of Colorwheel

{
  "theme": {
    "images": {
      "theme_frame": "hdcolourwheel.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#dbdbdb"
    }
  },
  "version": "2.0",
  "name": "Colorwheel",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Colorwheel” 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/v1/4c9c8020dec3d4323fcea25af1c85940824c29e11a4be185be88b5fe7f4626b3/http%3A//digitalblasphemy.com/preview.shtml%3Fi=colorwheel\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=colorwheel</a>"
}