Usage of nsIScriptLoaderObserver Interface

 Add an observer for all scripts loaded through this loader.

 @param aObserver observer for all script processing.

void addObserver(in nsIScriptLoaderObserver aObserver)

 Process a script element. This will include both loading the 
 source of the element if it is not inline and evaluating
 the script itself.

 @param aElement The element representing the script to be loaded and
        evaluated.
 @param aObserver An observer for this script load only

void processScriptElement(in nsIScriptElement aElement, in nsIScriptLoaderObserver aObserver)

 Remove an observer.

 @param aObserver observer to be removed

void removeObserver(in nsIScriptLoaderObserver aObserver)