Fix #1597, fix bug that kept shooting from deactivating immediately (previously deactivated after 500ms delay)
Fix #1597, fix bug that kept shooting from deactivating immediately (previously deactivated after 500ms delay)

mozilla-services/screenshots,fzzzy/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/pageshot,mozilla-services/pageshot,fzzzy/pageshot,fzzzy/pageshot,fzzzy/pageshot,mozilla-services/pageshot