Examine source code of balloon design

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "balloon design",
  "manifest_version": 2,
  "description": "To download high quality images for this theme visit our blog by clicking on below link:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/142cbef22dc906f6b57b642f99b442c0b089192cef1f954bd8d63ef80924aaa4/http%3A//vectorsplash.blogspot.in/p/mozilla-firefox-themes_20.html\">VectorSplash</a>"
}