In our web app, If I use a single browser, login to our application as user A, open another tab and login as user B - User A loses his session data. I assume this is due to
I don't exactly know what do you need this for, but as a developer I sometimes have to log into an application with multiple users. To do that I usually use incognito mode or if its more than 2 users I had some luck using this extension in chrome.
I know its not an answer to your question but it just might be what your looking for.