If you are having problems with “mixed content”. where some content is loading via HTTPS and others via HTTP.
This error is not caused by Security Ninja, the plugin does not try to load over HTTP specifically. it uses the prefix entered in settings of the website.
If you see this problem, please go to Settings -> General and verify your site is using HTTPS and not HTTP.
Even if your website otherwise enforces HTTPS in other ways, via a plugin, server setting or automatically redirecting HTTP visitors to HTTPS via the.htaccess file this does not change how the plugin loads dependent files.