/usr/share/mozilla/extensions/{3db10fab-e461-4c80-8b97-957ad5f8ea47}/{45d8ff86-d909-11db-9705-005056c00008} is in xul-ext-cookie-monster 1.2.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/mozilla/extensions/{3db10fab-e461-4c80-8b97-957ad5f8ea47}/../../../xul-ext/cookie-monster