Examine source code of Vofeel

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#e5e5e5"
    }
  },
  "version": "2.0",
  "name": "Vofeel",
  "manifest_version": 2,
  "description": "VOFEEL official theme of the web: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/464f2b5b8117b33ad95ef7ec3edd2ea2a2019107deaceafb2f64fd5dd94d3b34/https%3A//vofeel.com\" title=\"Vofeel international\">www.vofeel.com</a>."
}