Examine source code of Sunset by ptd

{
  "theme": {
    "images": {
      "theme_frame": "sunsetper.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Sunset by ptd",
  "manifest_version": 2,
  "description": "Made with some photos taken by <a href=\"https://outgoing.prod.mozaws.net/v1/99eebc79ecbc557a53497d5436ccecf53db6e842de7829731601b99bfa0e0633/http%3A//poisonthedragon.deviantart.com/\" rel=\"nofollow\">http://poisonthedragon.deviantart.com/</a>"
}