Well, it does exactly what it says. I really don't know why this isn't used by many more people. Much better than the extensions, which only add an item to the context menu.
Does what it says and does it instantly with no warning.
It would be nice if there was an option to give you a warning or maybe a confirmation dialog before closing them so you don't click it by mistake, maybe don't keep it pinned. That warning should count how many get closed as well
