Examine source code of digg.com blue.

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "digg.com blue.",
  "manifest_version": 2,
  "description": "An unofficial <a href=\"https://outgoing.prod.mozaws.net/v1/6d717df6d22253f18e4217652121ee63da829ac5c7c47dc013ad592f898ab07a/http%3A//digg.com\" rel=\"nofollow\">digg.com</a> Persona. All hail MrBabyMan!"
}