Hello @flintstoned ,
The features provided by the Security Optimizer can be checked on this link:
This includes Cross-Site Scripting (XSS) attacks?this includes Content-Security-Policy, X-Content-Type-Options .
There is no feature Permissions-Policy, X-Frame-Options and Referrer-Policy. The Strict-Transport-Security was part of the plugin but we removed it as it caused issues with clients that don’t renew their SSL certificates and this caused an impact on them.
All of the above can be enabled manually under .htaccess under SiteGround servers if those are needed.
Best regards,
Georgi Ganchev
SiteGround.com