Examine source code of Firefox Cup

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxCup_Generic_Persona_Sml.jpg"
    },
    "colors": {
      "frame": "#d4cdcd",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "Firefox Cup",
  "manifest_version": 2,
  "description": "Join the Firefox Cup!  Install Personas to support your team and compete. At the end of the tournament, the team who has the most fans wins the Firefox Cup!  <a href=\"https://outgoing.prod.mozaws.net/v1/15711beb4428d8c6eaa1c391a854a23f2f1efdc5407d76f67976af5681482b46/http%3A//www.firefoxcup.com\" rel=\"nofollow\">http://www.firefoxcup.com</a>"
}