Examine source code of kulach.de persona

{
  "theme": {
    "images": {
      "theme_frame": "persona1.png"
    },
    "colors": {
      "frame": "#545151",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "kulach.de persona",
  "manifest_version": 2,
  "description": "persona for <a href=\"https://outgoing.prod.mozaws.net/v1/e227a62a9762b85c916b9a1ce7aa257fc1ccbe5e67bf2a21bd6404aba96692d6/http%3A//kulach.de\" rel=\"nofollow\">kulach.de</a>"
}