To protect your network from new sources of threat or malware, you can use
External Dynamic List
in URL Filtering profiles to block or allow, or to define granular actions such as continue, alert, or override for URLs, before you attach the profile to a Security policy rule. Unlike the allow list, block list, or a custom URL category on the firewall, an external dynamic list gives you the ability to update the list without a configuration change or commit on the firewall. The firewall dynamically imports the list at the configured interval and enforces policy for the URLs (IP addresses or domains will be ignored) in the list. For URL formatting guidelines, see
URL Category Exception Lists.