Mac G4's getting error message "Secure Connection Failed"

I have been using jotform for years. Unfortunately, my fleet of Mac G4's are getting an error message "Secure Connection Failed" etc. when I try to submit a filled out form. The Form loads fine using "http://form.jotform.com/42114403324944" and I can fill it out, but when I try to submit, the URL changes to "https://submit.jotformpro.com/submit/42114403324944/" and I get the error message. I can only run Firefox 3.5.3 on my PPC Macs running OS X 10.4. We only collect data for 4 hours, twice a year. We only collect contact information for brides. There is no credit card info or anything more sensitive than emails, addresses, and phone numbers. Is there ANY work around?

Please use this link (https://form.jotform.com/42114403324944) to fix the issue.

Here's my test submission to your form using the link I provided:

I added a letter "s" to the link to make the form secure. 

I hope this helps.