Examine source code of www.lostson.at

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#848484"
    }
  },
  "version": "2.0",
  "name": "www.lostson.at",
  "manifest_version": 2,
  "description": "Do not modify the <a href=\"https://outgoing.prod.mozaws.net/v1/16cae4bd53047d1aeb16d28cfc9c6609405da0c5973997a7a90698daaa54ef93/http%3A//www.lostson.at\" rel=\"nofollow\">www.lostson.at</a> Persona!!!"
}