Examine source code of River Valley Dawn

{
  "theme": {
    "images": {
      "theme_frame": "hdrivervalleydawn.jpg"
    },
    "colors": {
      "frame": "#a7463d",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "River Valley Dawn",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “River Valley Dawn” wallpaper. 3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/0e8d193992c05900208137e9604bfae0280145c5fc8b1ea086076d4e4eb45a67/http%3A//digitalblasphemy.com/preview.shtml%3Fi=rivervalley2dawn\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=rivervalley2dawn</a>"
}