It happens rarely to me, but it sometimes does. Also, your machine can crash, someone can trip over a power line, ... At work, I routinely have something like

It happens rarely to me, but it sometimes does. Also, your machine can crash, someone can trip over a power line, ... At work, I routinely have something like 30-40 tabs open, if my browser can restore the session after a crash, that is very valuable to me.