Full Screen all the time

(Using latest Opera on latest OS X.)

Is there any way to get Opera to default to Full Screen?  Every time 
the last window is closed the next window that opens is not in Full 
Screen.  Its like telling a child to stop doing something irritating 
and they don't listen.  Over and over you have to activate something 
that should never have been deactivated.  

Many of us want FULL Screen ALL the time.  When you insert the Address 
Bar on the top with the Progress Bar within it, it gives me all the 
info I need.  And all the space possible.  Keyboard shortcuts handle 
the rest.  This is an excellent combination if only Opera would let it 
STICK!  

Perhaps there is plist I can edit so the screen is set?  There must be 
a way.  Height is very valuable, especially as many of us are going