Thread:Extension talk:WYSIWYG/Is there any tip/setting to prevent page exit without confirmation when editing ?

I used CKeditor before and think I remember I had an option to prevent accidental page exit during edition... Does anyone know if the 1.21+ mediawiki compatible version of WYSIWYG offers such a useful feature ? (fed up with loosing my changes while hitting the backspace key...) Thanks for your advices. JL