Related discussion: Saving passwords in Tor?
Is it possible to add a Password Manager to TOR, as I am not able to get the passwords to save?
While the password saving functionality is disabled in Tor Browser, you can still install password-manager browser extensions. I’d highly discourage adding external add-ons to Tor Browser though as this will alter your browser fingerprint.
Another alternative is using a standalone password manager (for example, KeepassXC) . One benefit of standalone password managers is that your passwords are not tied into one single browser.