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