Examine source code of Facemet

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Facemet",
  "manifest_version": 2,
  "description": "This is a cool persona based off of the site Facemet: check it out at <a href=\"https://outgoing.prod.mozaws.net/v1/a82a6a3228b19313dd290d2b171679b0800deb7989a2433f3d9035028098f0f4/http%3A//facemet.tk/\" rel=\"nofollow\">http://facemet.tk/</a>."
}