Examine source code of Just Ducky

{
  "theme": {
    "images": {
      "theme_frame": "justduckyhdr.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#e2eef0"
    }
  },
  "version": "2.0",
  "name": "Just Ducky",
  "manifest_version": 2,
  "description": "Created using Twisted Brush Pro Studio.  Can also be viewed at:\n<a href=\"https://outgoing.prod.mozaws.net/v1/2cbe54a7d1c702ec81390bf7bab4e427df156f52df8468a31f5c723763454499/http%3A//www.larryslostsoulsii.com/forum.htm\" rel=\"nofollow\">http://www.larryslostsoulsii.com/forum.htm</a>"
}