Recent answers to add a userhttps://support.mozilla.org/en-US/questions/13516512021-09-24T02:08:11-07:00You can have him use your browser by letting him have access to your computer user account.
Or
you c2021-09-24T02:08:11-07:00fredmcd-hotmailhttps://support.mozilla.org/en-US/questions/1351651#answer-1445927<p>You can have him use your browser by letting him have access to your computer user account.
Or
you can set him up with his own computer user account. This way, you would each
have your own Firefox profiles. Including passwords, bookmarks, settings . . . . . .
</p>