The question is two-fold. How secure do you want the password to be determines what system to use.

For example:

Banking - I never store a password or username for these. It’s always one I can remember. The password is lengthy, multi-factor authentification is turned on etc… I don’t trust any system.

Finanial webpages other than banks, , taxes, healthcare, etc, stuff that would hurt me personally if stolen, I use a stand alone password manager.

Anything else goes into Firefox password manager. Stuff I don’t give a fuck about if somebody hacks my password.