FYI, Firefox still has a profile manager, good for separating work and personal life. That makes the password manager very portable as you can sign into different Mozilla accounts in each one, to keep distinct sets of sync data. It's easy to create a separate shortcut/launcher file that starts up a secondary profile by adding these arguments to the command:

-P yourprofilename

However, I gave up on the inbuilt password manager. It's too simple, you can't edit entry labels, edit URLs (e.g. when site's main domain changes), or store anything other than usernames and passwords (e.g. notes).