[orca-list] Known issue: Tables are broken in Firefox nightly

[Joanmarie Diggs <jdiggs igalia com>]

Hey all.

Those of you who use Nightly will eventually discover that tables are
completely broken. And with all the changes I've been making recently,
you might suspect things are broken because of me. 'Fraid not:
https://bugzilla.mozilla.org/show_bug.cgi?id=1227124. Mozilla needs to
fix it.

FYI.
--joanie