Linux Mac OSX Windows 
 Interface holds information about an event.
[scriptable, function, uuid(05281820-ab62-11db-abbd-0800200c9a66)]
interface extIEventItem : nsISupports

Attributes

 Can hold extra details and data associated with the event. This
 is optional and event specific. If the event does not send extra
 details, this is null.
readonly attribute nsIVariant data 
 The name of the event
readonly attribute AString type

Methods

 Cancels the event if it is cancelable.
void preventDefault()