Examine source code of S-Logo

{
  "theme": {
    "images": {
      "theme_frame": "PersonaHeader_slogo.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "S-Logo",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/1a325e8b5d59a38ab8e12acdc00d2604168ab961ae67938848a811a13c7b22ef/http%3A//www.stefan-hartelt.de\" rel=\"nofollow\">www.stefan-hartelt.de</a>"
}