Hi!
I need to switch accounts on certain sites quickly, Firefox doesn't do that.
In Vivaldi, when syncing works, and it doesn't demand both a password and an encryption password, I just click on the login name and it immediately offers the other credentials that I need, I don't have to "view saved credentials" and pick the user and the password.
This is a useful feature because it saves time, and switching between logins is not cumbersome.