"doesn't allow" is probably not the right phrase, but when the "Adblock" extension is active in Firefox the submit button
doesn't show up on the published page. When it's disabled the "submit" button is there and works as it should.
Just spent the better part of an afternoon trying to figure out where the "submit" button went.

see attached.
"615 million devices now use adblock"
https://pagefair.com/blog/2017/adblockreport/
If there's a way to have it not be affected, that would be good.