Password Manager in the Microsoft Edge is sufficient and you don't need any third-party program and when there is a spyware infection, they are using different ways to steal your password and even if you don't use password manager. It is good idea to make sure your Anti-Malware product is updated and running. Authenticator provides additional layer of protection which is a good idea in protecting your identity. In addition, in case your password has been leaked or stolen, Microsoft Edge has a Password Monitor feature which informs you about such incident. Have a look at Use Password Monitor to help protect your passwords in Microsoft Edge.