Right. Many times I had to use 2 different browsers to test things on my vB platform, because it was not possible to stay logged in as admin and login with a test account in a new browser-[tab]. Most of the times this hassle of being forced to use 2 browsers irritated me (like discussed here 5 years ago... I guess Feldon is still deeply dreaming ) and I think a default solution for this would prove to be very handy for a lot of admins really.Even with a simple permission scheme, something like this might just bring a bit of peace to an admin to make sure they've set things up properly.
We have a very powerful permission system, but power can bring complexity. I think this is a good approach to dealing with it, without the privacy-type issues of actually logging into the account. While a test account works, it can be hard to replicate everything (such as user-specific permissions).
I hope more people press [Like] on the first posting.