Examine source code of Logo 1848er

{
  "theme": {
    "images": {
      "theme_frame": "firefox200_oben_1848er.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Logo 1848er",
  "manifest_version": 2,
  "description": "powered by <a href=\"https://outgoing.prod.mozaws.net/v1/a9fe586e1ec700a000994f5c8d8e1259e51fb8c0f81d54dccfecb1404203673f/http%3A//1848er.eu\" rel=\"nofollow\">1848er.eu</a>"
}