Examine source code of Communication butterfly

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#5b8080",
      "tab_background_text": "#bee3f7"
    }
  },
  "version": "2.0",
  "name": "Communication butterfly",
  "manifest_version": 2,
  "description": "<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/5db2d543fa93b8c5bd16691f02d4aaa8500f2adf752daa0fdb90bdf6928a203c/http%3A//www.kouw.eu\">www.kouw.eu</a>"
}