Examine source code of VITALS.com

{
  "theme": {
    "images": {
      "theme_frame": "vitals.png"
    },
    "colors": {
      "frame": "#636363",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "VITALS.com",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/27a9b067808a2668458dfb11e3bf6fbd384a72179e4099a0081d1de8852eacd8/http%3A//www.vitals.com\" rel=\"nofollow\">www.vitals.com</a>"
}