Maybe other people don't get the results I'm seeing, but it makes that page unusable in ff.

Brave has no problem rendering the page, though.

Anyways, since it seems to be a bug in ff, and I've learned that ff doesn't want any feedback from mobile-devices people, the bug report can be here,

or be deleted to not be fixed,

or whatever: I don't care, anymore.

Integrity requires that it be noted, but..