/usr/share/xul-ext/ is in xul-ext-gnome-keyring 0.10-1~deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xul-ext/gnome-keyring/
/usr/share/xul-ext/gnome-keyring/chrome/
/usr/share/xul-ext/gnome-keyring/chrome.manifest
/usr/share/xul-ext/gnome-keyring/chrome/skin/
/usr/share/xul-ext/gnome-keyring/chrome/skin/hicolor/
/usr/share/xul-ext/gnome-keyring/chrome/skin/hicolor/seahorse.svg
/usr/share/xul-ext/gnome-keyring/components/
/usr/share/xul-ext/gnome-keyring/components/loginManagerStorage.js
/usr/share/xul-ext/gnome-keyring/content/
/usr/share/xul-ext/gnome-keyring/content/gnome-keyring.js
/usr/share/xul-ext/gnome-keyring/content/options.js
/usr/share/xul-ext/gnome-keyring/content/options.xul
/usr/share/xul-ext/gnome-keyring/defaults/
/usr/share/xul-ext/gnome-keyring/defaults/preferences/
/usr/share/xul-ext/gnome-keyring/defaults/preferences/000system.js
/usr/share/xul-ext/gnome-keyring/defaults/preferences/defaults.js
/usr/share/xul-ext/gnome-keyring/install.rdf