Examine source code of Large Interactive

{
  "theme": {
    "images": {
      "theme_frame": "firefox_header.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#333333"
    }
  },
  "version": "2.0",
  "name": "Large Interactive",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/6263daa3f3a4b647f325def8cb4e42c1c024af9f138a8bc14b431027349991c5/http%3A//www.largeinteractive.com\" rel=\"nofollow\">www.largeinteractive.com</a>"
}