isolated browser sessions

hi, question
say i have multiple office 365 web credentials
and i want to open each one tabbed in RDM
problem is, that when i open one session and login, the next one after is actually the same session (like in any other regular browser). and the credentials used is actually same as the first tab (and not even asked)
is there a way to isolate them? so that each tab will be it's own browser session?

thank you