Enable Safe Search Enforcement
Many search engines have a safe search setting that filters out adult images and videos for search query return traffic. You can configure Safe Search Enforcement the Palo Alto Networks next-generation firewall to prevent search requests that do not have the strictest safe search settings enabled.
The Safe Search Enforcement for Google and YouTube Searches using a Virtual IP Address is not compatible with Safe Search Enforcement on the firewall.
There are two ways to enforce Safe Search on the firewall:

Related Documentation