Examine source code of Echoes

{
  "theme": {
    "images": {
      "theme_frame": "Pendulis.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Echoes",
  "manifest_version": 2,
  "description": "Echos in abstract space; created with ContextFree (<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/7cc59dc15c212f4b1c7218894ea2f7d2ae81e13d98c32dc7f375f1c5e27ac61f/http%3A//www.contextfreeart.org/\">http://www.contextfreeart.org/</a>)"
}