In google docs if you highlight some text and right click there are options for copy and paste. If you click them in chrome it works fine, if you click them in Firefox it says:

"These actions are unavailable using the Edit menus, but you can still use: Ctrl+C - for copy, Ctrl+X - for cut, Ctrl+V - for paste"

So for some reason some functions are just not present in other browsers. I can guarantee they could implement these functions if they wanted to.