Examine source code of Fractal World 19

{
  "theme": {
    "images": {
      "theme_frame": "FractalWorld19.jpg"
    },
    "colors": {
      "frame": "#ffff00",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "Fractal World 19",
  "manifest_version": 2,
  "description": "See more at <a href=\"https://outgoing.prod.mozaws.net/v1/28ab60b87bf5d7bdf2bbba86e99b09d2aa72d1427d0de6d4b01babc29efce251/http%3A//www.philofractal.com\" rel=\"nofollow\">www.philofractal.com</a>"
}