a reminder that not a single anti-rust concern troll has proved yet that they are not your average wintard:
lsof -p `pidof -S',' firefox` -Fn | grep -E '\.so(\b.*|$)'| while read l; do expr "$l" : "n\(.*\.so\).*"; done | sort -u
feel free to use that test when you see one of them waffling.