/usr/share/xul-ext/downthemall/modules/ is in xul-ext-downthemall 2.0.13-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xul-ext/downthemall/modules/_apiloader.jsm
/usr/share/xul-ext/downthemall/modules/api.jsm
/usr/share/xul-ext/downthemall/modules/constants.jsm
/usr/share/xul-ext/downthemall/modules/cothread.jsm
/usr/share/xul-ext/downthemall/modules/json.jsm
/usr/share/xul-ext/downthemall/modules/manager/
/usr/share/xul-ext/downthemall/modules/manager/connection.jsm
/usr/share/xul-ext/downthemall/modules/manager/decompressor.jsm
/usr/share/xul-ext/downthemall/modules/manager/globalprogress.jsm
/usr/share/xul-ext/downthemall/modules/manager/imex.jsm
/usr/share/xul-ext/downthemall/modules/manager/preallocator/
/usr/share/xul-ext/downthemall/modules/manager/preallocator.jsm
/usr/share/xul-ext/downthemall/modules/manager/preallocator/cothreads.jsm
/usr/share/xul-ext/downthemall/modules/manager/preallocator/nsithread.jsm
/usr/share/xul-ext/downthemall/modules/manager/queuestore.jsm
/usr/share/xul-ext/downthemall/modules/manager/requestmanipulation.jsm
/usr/share/xul-ext/downthemall/modules/manager/speedstats.jsm
/usr/share/xul-ext/downthemall/modules/manager/verificator.jsm
/usr/share/xul-ext/downthemall/modules/manager/visitormanager.jsm
/usr/share/xul-ext/downthemall/modules/preferences.jsm
/usr/share/xul-ext/downthemall/modules/prompts.jsm
/usr/share/xul-ext/downthemall/modules/support/
/usr/share/xul-ext/downthemall/modules/support/alertservice.jsm
/usr/share/xul-ext/downthemall/modules/support/batchgen.jsm
/usr/share/xul-ext/downthemall/modules/support/bytebucket.jsm
/usr/share/xul-ext/downthemall/modules/support/downloadHelper.jsm
/usr/share/xul-ext/downthemall/modules/support/fileextsheet.jsm
/usr/share/xul-ext/downthemall/modules/support/historymanager.jsm
/usr/share/xul-ext/downthemall/modules/support/iconcheat.jsm
/usr/share/xul-ext/downthemall/modules/support/icons.jsm
/usr/share/xul-ext/downthemall/modules/support/loggedprompter.jsm
/usr/share/xul-ext/downthemall/modules/support/mediator.jsm
/usr/share/xul-ext/downthemall/modules/support/metalinker.jsm
/usr/share/xul-ext/downthemall/modules/support/pbm.jsm
/usr/share/xul-ext/downthemall/modules/support/serverlimits.jsm
/usr/share/xul-ext/downthemall/modules/support/textlinks.jsm
/usr/share/xul-ext/downthemall/modules/support/timers.jsm
/usr/share/xul-ext/downthemall/modules/support/urlmanager.jsm
/usr/share/xul-ext/downthemall/modules/utils.jsm
/usr/share/xul-ext/downthemall/modules/version.jsm