/usr/share/xul-ext/form-history-control/chrome/content/overlay/ is in xul-ext-form-history-control 1.4.0.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcBrowserShutdownListener.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcBrowserShutdownListener.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcContextMenu.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcFormSaveOverlay.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcFormSaveOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcManageFormHistoryOverlay.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcManageFormHistoryOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcMenuOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcPreferencesOverlay.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcPreferencesOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcSeaMonkeyMenuOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcSeaMonkeyPreferencesOverlay.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcSeaMonkeyPreferencesOverlay.xul
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcSearchbarOverlay.js
/usr/share/xul-ext/form-history-control/chrome/content/overlay/FhcSearchbarOverlay.xul