Examine source code of Roof Cat

{
  "theme": {
    "images": {
      "theme_frame": "haeder.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Roof Cat",
  "manifest_version": 2,
  "description": "Roof Cat\nChat sur le toit\nOriginal : <a href=\"https://outgoing.prod.mozaws.net/v1/474ddad10feaf8ae38ef0ef9c46a940b29ec4a6246dd3af1a9ec794bce68fc45/http%3A//www.flickr.com/photos/arthur-caranta/4644524040/\" rel=\"nofollow\">http://www.flickr.com/photos/arthur-caranta/4644524040/</a>"
}