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Implemented by

 nsIDownloader

 A downloader is a special implementation of a nsIStreamListener that will
 make the contents of the stream available as a file.  This may utilize the
 disk cache as an optimization to avoid an extra copy of the data on disk.
 The resulting file is valid from the time the downloader completes until
 the last reference to the downloader is released.
[scriptable, uuid(fafe41a9-a531-4d6d-89bc-588a6522fb4e)]
interface nsIDownloader : nsIStreamListener

Methods

 Initialize this downloader

 @param observer
        the observer to be notified when the download completes.
 @param downloadLocation
        the location where the stream contents should be written.
        if null, the downloader will select a location and the
        resulting file will be deleted (or otherwise made invalid)
        when the downloader object is destroyed.  if an explicit
        download location is specified then the resulting file will
        not be deleted, and it will be the callers responsibility
        to keep track of the file, etc.
void init(in nsIDownloadObserver observer, in nsIFile downloadLocation)