Examine source code of Fiery Sunset

{
  "theme": {
    "images": {
      "theme_frame": "sunset4.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Fiery Sunset",
  "manifest_version": 2,
  "description": "Fiery sunset, based on my rendering (see <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/be27e521f8a342495ca9298aee8b4364c1574e1e9f3878aae2381d96707b5552/http%3A//dmytry.pandromeda.com\">http://dmytry.pandromeda.com</a> )."
}