Examine source code of Cropmarks Studio I

{
  "theme": {
    "images": {
      "theme_frame": "firefox-03.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Cropmarks Studio I",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/8beab978073d9a3aa37643a81a72f28fa4fce54029c8f7ad1a75bb1cb450b10b/http%3A//www.cropmarkstudio.com\" rel=\"nofollow\">www.cropmarkstudio.com</a>"
}