These extensions are killer, and are the primary reason I use Firefox. No other browsers have similar functionality at all that I've found.

For me, it's the best setup I've found in terms of cookie/session management. By default, I do want every new tab I open to come with a clean slate of no cookies, local storage, SQLite, or whatever other storage/tracking mechanisms are invented. If I need to open up a Google service, I simply open a new tab in my Google container. Combined with a good password manager to quickly login to lower security accounts, it is a marginal increase in work managing sessions, with the benefit of not tracking all your cookies and history around everywhere you go. The features aren't perfect since it's not a workflow optimized for consumer simplicity, but it works for me.