Examine source code of Nitestar.de

{
  "theme": {
    "images": {
      "theme_frame": "top.jpg"
    },
    "colors": {
      "frame": "#bdbdbd",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Nitestar.de",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/5f5e3cd948a74308abf6c8a643fa0a92cb314fc2e28011da2510e6c2ce0484b6/http%3A//Nitestar.de\" rel=\"nofollow\">Nitestar.de</a> Firefox-Design powered by <a href=\"https://outgoing.prod.mozaws.net/v1/9a6c5e47c3fd43b619e898668202203571b1109d783f7989e90041fb2111053e/http%3A//Nitestar-Designs.de\" rel=\"nofollow\">Nitestar-Designs.de</a>"
}