Examine source code of Chatferno.de

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Chatferno.de",
  "manifest_version": 2,
  "description": "Die Persona für <a href=\"https://outgoing.prod.mozaws.net/v1/affdf8dfbaa599990956439a8f737b67ac189befc5026aa47567691e21d2c961/http%3A//Chatferno.de\" rel=\"nofollow\">Chatferno.de</a>"
}