Examine source code of RetroWorld2

{
  "theme": {
    "images": {
      "theme_frame": "kopfbereich.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "RetroWorld2",
  "manifest_version": 2,
  "description": "offizielles Persona von <a href=\"https://outgoing.prod.mozaws.net/v1/3f33a82e9e9eb506cea1be80c03796929ca681b2ec49a7e7e465acc7fb633752/http%3A//www.retroworld2.us\" rel=\"nofollow\">www.retroworld2.us</a>"
}