Examine source code of Metropolis 2006

{
  "theme": {
    "images": {
      "theme_frame": "hdmetro.jpg"
    },
    "colors": {
      "frame": "#b3b3b3",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Metropolis 2006",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Metropolis (2006)” 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/d43d8ba5eee0bda7d53b905991d367572b39cd879567f23c3802a1df8e2962b6/http%3A//digitalblasphemy.com/preview.shtml%3Fi=metropolis2k6\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=metropolis2k6</a>"
}