Add a "temporary container" option

[briand]

I love love love the container tabs. Extremely useful for an IT tech like me to be able to easily access lots of different 0365 tenants at the same time. Was just helping someone set up and use containers in Brave, which are lacking in some respects compared to the Firefox containers, but had the very useful-sounding option of opening a temporary container when you right-click the new tab button. That would be very helpful to me. I already have a specific container designated for temporary purposes that I delete and recreate occasionally, just to start fresh. 

[Jon]

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