/usr/lib/x86_64-linux-gnu/libfreebl3.so is in libnss3 2:3.35-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/nss/libfreebl3.so
/usr/lib/x86_64-linux-gnu/nss/libfreebl3.so