DON'T have "Show my windows and tabs from last time" if you want quit warning

I was getting fed up with not getting a warning about quitting if I had more than one tab open but I think I have it licked. Try this: Set all the warning options to true. NOW go to Tools - Options - General tab and make sure "Show my windows and tabs from last time" is NOT your chosen option. Either of the others seems to be okay. Click OK. Now when you attempt to close Firefox with more than one tab still open, you should get a warning message. It beats me why it's now so difficult to set this USEFUL feature on and counter-intuitive - who'd have thought you have to have that setting disabled???