Kathleen Brade authored Jun 29, 2016 and Georg Koppen committed Jul 17, 2016

Display the external app confirmation dialog in response to the new
"external-app-requested" observer service notification. Remove
messy overrides of Mozilla components and console log filtering.

Remove obsolete "on-modify-drag-list" observer and pre-Firefox 4.0
module registration code from the External App Handler component.