Examine source code of The Spark

{
  "theme": {
    "images": {
      "theme_frame": "sparkhead1.jpg"
    },
    "colors": {
      "frame": "#b8b8b8",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The Spark",
  "manifest_version": 2,
  "description": "Firefox Persona version of my 'The Spark' wallpaper, available at <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/1ba0a9480db5ca22051bb90c42ce31d526513821464c13a591cde6412f5b41b0/http%3A//www.digitalblasphemy.com/\">http://www.digitalblasphemy.com/</a>."
}