Family tree display fails with Firefox 90.0 (64bit)

[Arjuna Rao Chavala]

URL: https://reasonator.toolforge.org/geneawiki2/?q=Q42

This website should display the family tree graphic on the left, but nothing displays

The URL for issue reported at Firefox bugzilla is
https://bugzilla.mozilla.org/show_bug.cgi?id=1723343