/usr/share/mozilla/extensions/{a79fe89b-6662-4ff4-8e88-09950ad4dfde}/savedpasswordeditor@daniel.dawson is in xul-ext-password-editor 2.9.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/mozilla/extensions/{a79fe89b-6662-4ff4-8e88-09950ad4dfde}/../../../xul-ext/password-editor