https://www.techradar.com/news/mozilla-launches-new-desktop-password-manager-firefox-lockwise

Mozilla has released a free password manager, Firefox Lockwise, to make it easier to manage your website logins. The launch follows the release of Lockbox – a similar tool for mobile devices

Lockwise isn't yet built into Firefox; instead it's downloadable as a browser extension. Once it's installed, you can access it by choosing 'Logins and passwords' from Firefox's main menu. Here, you'll be able to see all the login details Firefox has stored, and copy passwords or launch websites from within the extension.