Examine source code of Tema per Firefox

{
  "theme": {
    "images": {
      "theme_frame": "sopra5.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Tema per Firefox",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/772716912880210d9760934432ba46057d3b4e08899aa596efef23cd963b053d/http%3A//www.youtube.com/user/1926napolichannel\" rel=\"nofollow\">www.youtube.com/user/1926napolichannel</a>"
}