/usr/lib/ is in firefox-locale-hy 28.0+build2-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/firefox/
/usr/lib/firefox/distribution/
/usr/lib/firefox/distribution/searchplugins/
/usr/lib/firefox/distribution/searchplugins/locale/
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/eBay.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/google.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/wikipedia-hy.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/duckduckgo.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/amazondotcom.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/list-am.xml
/usr/lib/firefox/distribution/searchplugins/locale/hy-AM/yahoo.xml
/usr/lib/firefox-addons/
/usr/lib/firefox-addons/extensions/
/usr/lib/firefox-addons/extensions/langpack-hy-AM@firefox.mozilla.org.xpi