Examine source code of losbones.net

{
  "theme": {
    "images": {
      "theme_frame": "bonesfirefox.jpg"
    },
    "colors": {
      "frame": "#614c4c",
      "tab_background_text": "#967d7d"
    }
  },
  "version": "2.0",
  "name": "losbones.net",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/738a2cb6c7b67274ee80e8b705475c06fbbc2e7d19e07ea8f7f786acfc846420/http%3A//losbones.net\" rel=\"nofollow\">losbones.net</a>"
}