Examine source code of nature

{
  "name": "nature",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "pexels-gabriele-niek-688131453-17959888.jpg"
    },
    "colors": {
      "frame": "rgba(39, 54, 89, 1)",
      "tab_background_text": "rgba(196, 196, 196, 1)",
      "toolbar": "rgba(94, 94, 94, 1)",
      "bookmark_text": "rgba(186, 186, 186, 1)",
      "toolbar_field": "rgba(75, 73, 143, 1)",
      "toolbar_field_text": "rgba(125, 125, 125, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c553431f-497b-4893-a255-86af3e1764a5}"
    }
  }
}