Examine source code of Midnight gray

{
  "theme": {
    "images": {
      "theme_frame": "dark-gray2.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Midnight gray",
  "manifest_version": 2,
  "description": "A simple and easy persona made by Eivind Bergmann, <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/2bf98fdd40392a917f580802408fdc6cc92d41b0a59807b7a622ad4aadad7624/http%3A//www.twitter.com/loffern\">http://www.twitter.com/loffern</a>\n\nEnjoy!"
}