So it's Firefox-specific, but the way it works is that the add-on basically has "containers" that each have their own profiles, including their own log-ins.
So you can make a different "container" for each account. Then you can just open any link (ie, any tag) in the appropriate container and tag away.
Mine I guess got borked on install so it's a pain in the ass for me to add more containers :| Other people apparently find it very easy and straightforward though!
So you can make a different "container" for each account. Then you can just open any link (ie, any tag) in the appropriate container and tag away.