Examine source code of Fireworks I

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Fireworks I",
  "manifest_version": 2,
  "description": "celebrate, Independence Day, bright, 4th of July, night, lights, neon, wedding, colors, loud, fire, sky, holiday\t\n\nDesigned by MaDonna\n\nMy wallpaper to match is at: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/aa185826fcfd52c3e59a321e5d9cc943a63745457c037aecfe2cba361491920b/http%3A//abstract.desktopnexus.com/wallpaper/1498122/\">http://abstract.desktopnexus.com/wallpaper/1498122/</a>"
}