https://really-simple-ssl.com/downloads/really-simple-ssl-pro/

Extensive scan which enables you to detect the source of mixed content that couldn’t be fixed automatically, with fix buttonPremium email supportHttpOnly and secure flags to make the cookies more secureImprove security by enabling HTTP Strict Transport Security for your siteSubmit your site to the HSTS preload listWarning by email and in your SSL dashboard when your certificate is about to expireMixed content fixer for the back-end

Changelog

* Improvement: added integration with FlyingPress and Fastest Cache

* Improvement: fix exiting a filter, causing a compatibility issue with BuddyPress