Examine source code of 49erFootball

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#241f1f",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "49erFootball",
  "manifest_version": 2,
  "description": "Another 49er themed persona! Includes some of my favorite players and photos from <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/f44739058d23ad27a3aee7dbfca42f0d64306fb38cba49ccacfd547ec99ae31c/http%3A//49er.com\">49er.com</a>."
}