Examine source code of The Three funny Four

{
  "theme": {
    "images": {
      "theme_frame": "persona-Firefox.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "The Three funny Four",
  "manifest_version": 2,
  "description": "The Three funny Four,\n\nSimson-Reisen und Touren durch Europa.\n<a href=\"https://outgoing.prod.mozaws.net/v1/49bdda38e09e5410e9d52806a649bee719454c61f28a758455e544a300d9a2be/http%3A//www.thethreefunnyfour.com\" rel=\"nofollow\">www.thethreefunnyfour.com</a>"
}