Examine source code of SentimentStocks

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "https://www.alphavantage.co/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f3d0b5a2-5c0b-1e4d-5b1e-2c1f30dfb5ab}"
    }
  }
}