Examine source code of Sandberg

{
  "theme": {
    "images": {
      "theme_frame": "persona_header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sandberg",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/3a63e3aa4eaf7cae171ab834a4a2711ce6d3d7d2ab39ecf82803724c027d025d/http%3A//www.sandberg.it\" rel=\"nofollow\">www.sandberg.it</a>"
}