verification codes don't work

It has been a week since the Zoho tech support started on my initial request to troubleshoot the verification code not working on my forms. Apparently the code doesn't work on Firefox, but it works fine on the non-embedded form page.

Has anyone else had this problem, and how did you or the tech support team fix it? I would give you a link to the form's webpage, but I've had to disable the verification code so that the form can receive submissions.

This is important to my company, and probably the only reason we subscribed.

Thanks for your help.