@ricci
It's awesome and I use it all the time, but there are some gotchas to be aware of.

For example let's say you're on eBay and it's opened in a "shopping" container.
If you've set "paypal" to open in a different container then trying to buy something on ebay using paypal will bork, as the containers can't talk to one another to verify the session tokens. They need to be in the same container.

Just something to be aware of. Still worth using!!!