Examine source code of DiLer

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "DiLer",
  "manifest_version": 2,
  "description": "Lernplattform: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/89304fa2d45f900481e3c9f560c8d29a55731b74788d6279688d1ca8d00c0a35/http%3A//digitale-lernumgebung.de\">digitale-lernumgebung.de</a>"
}