Examine source code of bulett.net

{
  "theme": {
    "images": {
      "theme_frame": "bulett.png"
    },
    "colors": {
      "frame": "#c4ff00",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "bulett.net",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/28ef7294aa525dec0f2f76fb16d99777da89dea08a5fbbeee62fc4bd191c8ee3/http%3A//bulett.net\" rel=\"nofollow\">bulett.net</a>!"
}