Examine source code of The Cubes

{
  "theme": {
    "images": {
      "theme_frame": "PersonasHeaderCubes.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The Cubes",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/9137cdfcbd81da4c2521d8a25523f24a9186091f7ea5a943b3ffeba02783a809/http%3A//peter.beckert.ch/\" rel=\"nofollow\">http://peter.beckert.ch/</a>"
}