Examine source code of Wolkenschau

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#def0ff"
    }
  },
  "version": "2.0",
  "name": "Wolkenschau",
  "manifest_version": 2,
  "description": "+++Wolkenschau+++\n\nStress at work or in everyday life? Then this theme helps. Beautiful colors and contrasts bring relaxation.\n\nOther topics from me:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/5943d2eb3bc934ba5744510586379368da9dc03d41052954f0db53eb782dc199/https%3A//nico-schubert.jimdo.com/service/themendesigner/firefox/\">https://nico-schubert.jimdo.com/service/themendesigner/firefox/</a>"
}