Examine source code of apples day

{
  "theme": {
    "images": {
      "theme_frame": "apple-day-modernart.jpg"
    },
    "colors": {
      "frame": "#f7f2f2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "apples day",
  "manifest_version": 2,
  "description": "apples day\nby Markus Frings German painter\n<a href=\"https://outgoing.prod.mozaws.net/v1/2189699c8b05079db1f1dc2d5229290395f594cec9d2d78755f10b4d760cb03b/http%3A//www.markusfrings-modernart.de\" rel=\"nofollow\">www.markusfrings-modernart.de</a>"
}