Firefox Lockwise or how the integrated password-manager is called, it pretty good.
The syncing is centralized, but encrypted, so no problem here. I prefer Syncthing and Keepass, but while KeepassDX works perfectly on Android, KeepassXC doesnt work at all at the moment, so I use it.
While there is an option (which should be opt-out, not opt-in!) to encrypt the passwords locally using master passwords on Desktop, there just isn't one on Mobile! This is horrible, as anyone having access to your phone could also read your passwords.
Also, phones have fingerprint sensors very often. KeepassDX has a pretty good implementation for "modern unlocking", where the fingerprint unlocks the password and decrypts the vault.
This absolutely has to be integrated into Mobile, along with a general Fingerprint-unlock. I mean, its a privacy browser, and there are different factors of privacy. People having access to your browsing history and passwords, is one of the threats some people fear.
Thank you for this browser, its the only good non-Chromium one we have.