I was doing some research on design patterns for delegates verses interfaces and one page tab in particular caused an all to familiar message.

Just from habit I started to make a mental note of all the tabs I had open as I figured IE was about to go completely belly up and I would lose everything. Much to my delight, however, a simple message popped up indicating that the tab was about to be restarted and all my other sessions were intact.

I know this is not new to Firefox users but I have stubbornly stuck with IE (through thick and thin) and this marks one of those truly helpfully things that they are ultimately embarrassed to not already have.