/usr/lib/firefox/ is in firefox-locale-sq 11.0+build1-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/firefox-addons/extensions/
/usr/lib/firefox-addons/extensions/langpack-sq@firefox.mozilla.org.xpi
/usr/lib/firefox/distribution/
/usr/lib/firefox/distribution/searchplugins/
/usr/lib/firefox/distribution/searchplugins/locale/
/usr/lib/firefox/distribution/searchplugins/locale/sq/
/usr/lib/firefox/distribution/searchplugins/locale/sq/amazon-en-GB.xml
/usr/lib/firefox/distribution/searchplugins/locale/sq/bing.xml
/usr/lib/firefox/distribution/searchplugins/locale/sq/eBay.xml
/usr/lib/firefox/distribution/searchplugins/locale/sq/google.xml
/usr/lib/firefox/distribution/searchplugins/locale/sq/wikipedia-sq.xml
/usr/lib/firefox/distribution/searchplugins/locale/sq/yahoo.xml