Makes me feel even more secure, which is why I use Firefox in the first place! Sometimes it makes things tricky though when one container will have a link/redirect to a page that you have set to another container. I combined my shopping/bank tab because I pay with Paypal whenever I can, and the redirects from checkout pages to Paypal would consistently mess up because Paypal was set to banking but I was using a shopping tab and my cart was in the shopping container.