This page lists events that are only available in Gecko Chrome code (and sometimes in other privileged circumstances, eg. UA widgets).

MozBeforePaint
Gecko 2.0 adds a new method for performing JavaScript controlled animations that synchronize not only with one another, but also with CSS transitions and SMIL animations being performed within the same window.
MozScrolledAreaChanged
The MozScrolledAreaChanged event is fired when the document view has been scrolled or resized.
smartcard-insert
The smartcard-insert event is fired when the insertion of a smart card has been detected
smartcard-remove
The smartcard-remove event is fired when the removal of a smart card has been detected.