Examine source code of FreeStyle

{
  "theme": {
    "images": {
      "theme_frame": "FreeStyle.jpg"
    },
    "colors": {
      "frame": "#679911",
      "tab_background_text": "#4cdded"
    }
  },
  "version": "2.0",
  "name": "FreeStyle",
  "manifest_version": 2,
  "description": "Fractal art\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/e9294d52e633e0e06c31a23c214117aa2d19a962fe5ee3a3b3b657f9eb56b8f6/http%3A//sundaymay.deviantart.com/\">http://sundaymay.deviantart.com/</a>"
}