Examine source code of spring song

{
  "theme": {
    "images": {
      "theme_frame": "spring.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "spring song",
  "manifest_version": 2,
  "description": "spring!\n<a href=\"https://outgoing.prod.mozaws.net/v1/4f9140c26b9433f790cf67581f1ec4c22f993b3a7ef01e16508f5bd4b20c093f/http%3A//www.wendywlee.com\" rel=\"nofollow\">www.wendywlee.com</a>"
}