Ever faced difficulty in opening multiple session/logins of your favourite website? A well known trick is that you can do that by opening another browser windows in private/incognito mode and login into website. Now no more need for secondary browsers or private sessions because there is an browser extension that helps you open multiple active sessions of the same website in different tab in the same browser, called as SessionBox.
Tabs are managed by SessionBox do not use shared storage, variables are handled by the extension. Other tabs therefore cannot hijack your sessions. The only thing that is not available in free service is Synchronization. You can get it in pro-service, with that your sessions are securely synchronized between your devices. You can also use different proxies for different tab sessions in pro-service.
SessionBox is available for Chrome, Firefox and Opera browsers.