Examine source code of Bingo.com

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#00e5ff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Bingo.com",
  "manifest_version": 2,
  "description": "love <a href=\"https://outgoing.prod.mozaws.net/v1/977d3dcd34c25e0188c58106b012454c5dbded00233f572281e4ae429e6f1ba4/http%3A//bingo.com\" rel=\"nofollow\">bingo.com</a> and match your browser with this fantastic theme."
}