If it is not indeed a new concept, it seems a great deal of people either didn't know about it, or refused to care. Rather than be annoyed at the rediscovery, perhaps a better outlook would be to rejoice that these same ideas are reaching more people through the new words than it did with the old?
cschreib
joined 4 months ago
I don't know exactly what part of a separate profile you are after, so this may not be a 100% substitute, but I found container tabs in Firefox to work quite well (with some extensions to improve UX). It's still the same profile though, so passwords and history are shared.