Examine source code of Minimaly-Darky

{
  "name": "Minimel-Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ios-14-wwdc-2020-iphone-12-ipados-dark-red-stock-3440x1440-1446 (2).jpg"
    },
    "colors": {
      "frame": "rgba(26, 26, 26, 1)",
      "tab_background_text": "rgba(0, 161, 121, 1)",
      "toolbar": "rgba(36, 36, 36, 1)",
      "bookmark_text": "rgba(255, 94, 0, 1)",
      "toolbar_field": "rgba(66, 66, 66, 1)",
      "toolbar_field_text": "rgba(0, 166, 255, 1)",
      "tab_line": "rgba(0, 140, 121, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6199850c-15c8-4330-b05f-f163377d52b0}"
    }
  }
}