>and I believe both do it in an end-to-end encrypted way.
in chrome, the end-to-end part is opt-in. https://support.google.com/chrome/answer/1181035?hl=en
Relying on your browser's password storage is very risky:
Sorry, But Your Browser Password Manager Probably Isn't Enough https://www.wired.com/2016/08/browser-password-manager-proba...
Why you shouldn't use your browser to store online passwords https://scotthelme.co.uk/storing-passwords-in-browser/
Everyone seems to treat password managers as an arcane mysterious tool and acts temporarily amnesiac to the fact that every browser that anyone has used asks if you want to save your password. Both Firefox and Chrome let you sync your passwords between multiple computers, and I believe both do it in an end-to-end encrypted way.