I agree with samyotix, it is a very good idea and looks very convenient, as long it is hidden away until it is needed. I don't think it is necessary to have a password option just sitting there unless you are logging into wherever.
The tab groups sound very convenient and efficient for those using it. When I am using edge though, I always accidently create group tabs, and it feels impossible to ungroup them. Advice from a regular user, try to make it as easy as possible to ungr...
