nsIDocNavStartProgressCallback callback

The callback, if non-null, used when globalProgressListenerEnabled is true. Setting this to null has the side effect of unqueueing any pending events for which a callback would be notified; setting it to any other value, however, will not unqueue any events.

PRUint32 delay

Number of ms to wait after receiving a doc load event and calling the callback. Even when set to zero, we set a timer so the call will fire asynchronously. Defaults to 0.

PRBool globalProgressListenerEnabled

Set to true to enable this component. Defaults to false (disabled). When you set this to true, the listener will be attached to the docloader and the callback can start getting events.