Ok you just need to use the correct whitelist rule format, which is to have a comma and space between each whitelist rule…
/wp-sonic-defender/ajax.php, /sonicreply/js/front.js
…And then do the rest of the Plugin Firewall setup steps…
Plugin Firewall Manual Setup Steps
1. —
2. Click the Save Whitelist Data button.
3. Click the Create Firewall Master File button.
4. Select the Plugin Firewall BulletProof Mode Radio button.
5. Click the Activate|Deactivate button to activate the Plugin Firewall.