Examine source code of delicious.com laters

{
  "theme": {
    "images": {
      "theme_frame": "Delicious_Persona_header1.png"
    },
    "colors": {
      "frame": "#d4d4d4",
      "tab_background_text": "#363636"
    }
  },
  "version": "2.0",
  "name": "delicious.com laters",
  "manifest_version": 2,
  "description": "An initial persona for the social bookmarking site Delicious (aka <a href=\"https://outgoing.prod.mozaws.net/v1/fa14e1865a956374b564170429fd9a0b3d948579309783668814e70a516ed636/http%3A//del.icio.us\" rel=\"nofollow\">del.icio.us</a>)."
}