Examine source code of ACF Tools (Copy Sub Fields fix)

{
  "manifest_version": 3,
  "name": "ACF Tools (With Fix for Copy Sub Fields)",
  "version": "4.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "acf-tools@puszka.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "static/popup.html",
    "default_title": "Toggle ACF Tools settings",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/wp-admin/*",
        "*://*/**/wp-admin/*"
      ],
      "css": [
        "styles/style.css",
        "styles/modal.css",
        "styles/highlight.css"
      ],
      "js": [
        "lib/jquery-4.0.0.min.js",
        "lib/highlight.min.js",
        "scripts/app.js",
        "scripts/user-settings.js",
        "scripts/misc.js",
        "scripts/fields.js",
        "scripts/i18n.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "static/modals/*"
      ],
      "matches": [],
      "extension_ids": []
    }
  ]
}