If for some reason the Plugin Firewall Test Mode tool does not work on your website then you can use the Pro-Tools cURL Multi page scanner to scan for plugin scripts that need to be whitelisted.
I used the Pro-Tools cURL Multi page scanner to scan your website for plugin scripts that need to be whitelisted on your website. You can use the Pro-Tools cURL Multi page scanner to scan your own site or any other website. This is the only plugin script that was found on your website that needs to be whitelisted in your Plugin Firewall Whitelist Text area on your website.
/spam-free-wordpress/js/sfw-ipwd-nn.js