Examine source code of Tropical theme

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Tropical theme",
  "manifest_version": 2,
  "description": "Here is a skin for Firefox integrate the theme \"Tropical\" for Gnome Linux desktop.\nYou can find it here: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/d3d327a9ee1638dda7ea882bdd42293fd9fe03f982e68d09b304a5d1193219ef/http%3A//francois.vogelweith.com\">http://francois.vogelweith.com</a>\nIt uses the wallpaper of this artist: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/faacf542e0db4ee3c84be6781120b7f96479ff90bbf807910fd28ea170bda535/http%3A//bobbyperux.deviantart.com/\">http://bobbyperux.deviantart.com/</a>\n\nThank you to François VOGELWEITH and  Roberto ABRIL."
}