What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It works in Chrome though.
Upon checking the secure form checkbox in firefox, I found it to be working fine. Checking and un-checking the "Secure form" checkbox does change the embed code to secure and non secure code respectively. Are you using Mac OS?
Though it is unlikely but try to clear your browser cache and see if that makes any difference. Here is a guide which should help you clear browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache
Here are the steps to remove the secure embed URL:
1. Load your form in editor.
2. Click on "Setup & Embed" and then click on "Embed Form" which is in editor toolbar.
3. Choose the appropriate embed method and ensure that "Secure Form" checkbox is remained unchecked.
4. Copy this code and use it to embed your form in any webpage.
FYI: upon checking your account status, I found that you have not been receiving any SSL submission.
Do get back to us if the issue persists.