Examine source code of spartanpixel.com header

{
  "theme": {
    "images": {
      "theme_frame": "sp_header3.jpg"
    },
    "colors": {
      "frame": "#5e5d5d",
      "tab_background_text": "#a8a6a6"
    }
  },
  "version": "2.0",
  "name": "spartanpixel.com header",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/d8e8bcd0f82fc55e14b0ab051882352be3f8887e5689307fe83908f8a36fce4f/http%3A//spartanpixel.com\" rel=\"nofollow\">spartanpixel.com</a> header"
}