I love this plug in. I use to open a local app in Firefox and then in IE so I would have different sessions. I also used Private browsing to do the same but it didn't keep cookies and settings from session to session. I use containers to contain those companies that have a network of different sites. For example a company like "MyBook" that also has a messaging site called "Mymessager" I can put both of those in one container, that way "MyBook" is not getting info from my web browsing, or purchasing habits.