Examine source code of Hockerrocker

{
  "theme": {
    "images": {
      "theme_frame": "firefox_design_1.jpg"
    },
    "colors": {
      "frame": "#141313",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Hockerrocker",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/50d6323e9ef75dc68e3079d92676dffe45feea43a3e52829e6c83788aa703cf9/http%3A//www.hockerrocker.de\" rel=\"nofollow\">www.hockerrocker.de</a>"
}