Examine source code of Hylus.com

{
  "theme": {
    "images": {
      "theme_frame": "PersonaHeader.jpg"
    },
    "colors": {
      "frame": "#670270",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Hylus.com",
  "manifest_version": 2,
  "description": "The official <a href=\"https://outgoing.prod.mozaws.net/v1/bd932b8bbfc4ceca9f4b9b02588fc47642218a92fff4677b24a9f32af88a199b/http%3A//Hylus.com\" rel=\"nofollow\">Hylus.com</a> Persona Theme"
}