/usr/share/mozilla/extensions/{3db10fab-e461-4c80-8b97-957ad5f8ea47}/{fbfbf0bf-032e-427e-932d-0b000a34f168} is in mozilla-biofox 1.6-1.
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/mozilla-biofox