Examine source code of It's a Boy

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c0d1e0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "It's a Boy",
  "manifest_version": 2,
  "description": "Stock credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/0d1853fc1a0a2b9e0ea902e7892390b3ebbb67a4bc2f4afd1f004cba63ca21e2/http%3A//www.freepik.com/balasoiu\">Claudia Balasoiu</a>"
}