MultiAccountContainerSpecial by usefulladdons

With MultiAccountContainers, you can log into multiple accounts on the same website simultaneously, shopping, emails, etc. Color-coded distinction of self-named tabs.

NOTE:
This Addon is based on a Mozilla owned and develeoped account. The original Version did not fit into my wishes of features, so I asked Mozilla it would be ok to rework it. my work was to enhance the offered features a bit by the above described features.