Examine source code of Medee by Alfons Mucha

{
  "theme": {
    "images": {
      "theme_frame": "medee_header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Medee by Alfons Mucha",
  "manifest_version": 2,
  "description": "Medea theme by Alfons Mucha 1898\n\nThis image (or other media file) is in the public domain because its copyright has expired.\n\nThis applies to the United States, Australia, the European Union and those countries with a copyright term of life of the author plus 70 years."
}