What is d reason of mozilla n google crome getting crashed again n again?

it pisses me off wenever mozilla n google crome gets crashed|||Maybe it's because of your operating system, or a mis-behaving add-on. Make sure you are using the latest versions of Firefox and Chrome, and update your add-ons.|||Don't open as much tabs only a fewer at time than it won't crash again n again.|||the problem is your computer or that you dont do things properly