Examine source code of Winter Joy

{
  "name": "Winter Joy",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "JoyfulWinterH.jpg"
    },
    "colors": {
      "frame": "rgba(214, 210, 210, 0.94)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(214, 210, 210, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(214, 210, 210, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(227, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9a661af-2d76-4499-9a9f-c7a6fbb16e81}"
    }
  }
}