Examine source code of Rekordmeister

{
  "theme": {
    "images": {
      "theme_frame": "RM2Kopie.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rekordmeister",
  "manifest_version": 2,
  "description": "official pictures <a href=\"https://outgoing.prod.mozaws.net/v1/6c19e9c6523d9b4dac4ac1b700c6e627fa374928f1fae80aded291a7feb46704/http%3A//rekordmeister.ch\" rel=\"nofollow\">rekordmeister.ch</a>"
}