Examine source code of Bodybuilding.com

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#005479",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Bodybuilding.com",
  "manifest_version": 2,
  "description": "Does your browser even lift? Brand it with <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/594ba850817936b703f878ffc30cd3a6b152c3885ab4881c2e91287a9fe236f0/http%3A//Bodybuilding.com\">Bodybuilding.com</a> to keep you motivated."
}