@BEBF738VD Such approach is not reliable: Can websites track me across different qubes?. See also: How does Qubes OS provide privacy? Only Whonix is reliable in providing privacy.

What advantage is there in having a qube dedicated to a particular website or having a separate qube for your password vault.
See this: Why Use Minimal Templates?
In particular:
Even though minimal templates are, ceteris paribus , more secure, I contend that most novice users shouldn’t try to use them.
The bulk of the benefit comes from using Qubes at all , even in its default configuration. Everything after that is of comparatively minor benefit.