Examine source code of ballooninghistory.com

{
  "theme": {
    "images": {
      "theme_frame": "Header3.jpg"
    },
    "colors": {
      "frame": "#dae7ed",
      "tab_background_text": "#1a1f40"
    }
  },
  "version": "2.0",
  "name": "ballooninghistory.com",
  "manifest_version": 2,
  "description": "Based on the site background of <a href=\"https://outgoing.prod.mozaws.net/v1/12c2fd462f0ebc0055697469314373cd003520d885e4187f392d24ff2cdd26ea/http%3A//www.ballooninghistory.com\" rel=\"nofollow\">www.ballooninghistory.com</a>.  Tried it out, liked it, and thought what the heck - maybe someone out there will like it, too."
}