Examine source code of icethunder.net

{
  "theme": {
    "images": {
      "theme_frame": "header24.jpg"
    },
    "colors": {
      "frame": "#fc0000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "icethunder.net",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/454272ad3c03e1b05c25069310f06f685db00e7660132fcebe1d9c71a1c996dd/http%3A//icethunder.net\" rel=\"nofollow\">icethunder.net</a> default personas theme"
}