Examine source code of Copy Restart URL

{
  "manifest_version": 3,
  "name": "Copy Restart URL",
  "version": "1.0",
  "description": "アイコンクリックで about:restartrequired をコピーし、新しいタブを開きます。",
  "browser_specific_settings": {
    "gecko": {
      "id": "copy-restart-url@your-name.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "clipboardWrite",
    "tabs"
  ],
  "action": {
    "default_icon": "icon.png",
    "default_title": "コピーして新しいタブを開く",
    "default_popup": "popup.html"
  }
}