Examine source code of Valley 2000

{
  "theme": {
    "images": {
      "theme_frame": "hdvalley2000.jpg"
    },
    "colors": {
      "frame": "#6b86a3",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Valley 2000",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Valley (2000)” 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/fb1f619726f265797173db64a5a0f406cd49cd1afd6191e9baa86a2e5dea859a/http%3A//digitalblasphemy.com/preview.shtml%3Fi=valley2k\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=valley2k</a>"
}