Hello, let's work together to fix the issue
Firstly, I must tell that such a functionality can't be implemented without additional binary in firefox quantum
Secondly, you might check it with VirusTotal.com - it checks a binary with more than 50 different antiviruses
And last, could you please tell me the name of your antivirus so I can work with them and prove that my app isn't doing anything wrong?

I'm sorry you have troubles using my extension

P.S. Thank you for the update, I'll get it fixed