This app and this app developer are behaving in a quite shady way. This "Firewall" app pops up a fake security alert within a minute about the "Apple Security & Privacy Preference" being compromised. It also goes as far as creating a fake System Notification in the upper right corner, prompting to download from antivirus.1stbytesecurity.com, which is also registered through Namecheap with WhoisGuard, exactly like the app dev's own geniusapps.online domain. Need I say more? On yes, one of this app dev's other apps--Disk Medic 1.0.1--wants to access your Contacts and Calendar, even though it's ostensibly billed as a duplicate file finder. Stay away! This scammy dev should be banned from Macupdate!