This file is indexed.

/usr/lib/thunderbird/extensions/langpack-ca@lightning.debian.org is in lightning-l10n-ca 1:52.9.1-1~deb9u1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/thunderbird/extensions/../../../share/lightning/extensions/langpack-ca@lightning.debian.org