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Thanks in advance
Please try the following:
a) Open a new Firefox browser window or tab.
b) Copy the following then paste it into the Firefox address bar: about:config
c) Hit the Enter key.
d) On the following page, click the button: "I'll be careful, I promise!"
g) Finally, refresh your browser.
2) Since you do not like using iFrame, you have to deal the script conflict.
Here's how to deal prototype and jQuery conflicts. http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/
3) I also think DOCTYPE declaration in your page should be updated to this one:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
Let us know what happens, we will be glad to assist you.
It appears that there is an issue with firefox and jotform. I took the same form embed code (not iframe), and embedded the script in a blank firefox page, and same issue occurs. Thoughts to fix this or is this something that jotform is working on?
Thanks in advance,
It seems that there is some conflict within that form, because I tried another simple form in firefox, and it worked fine.
Considering that we are recommending using of iFrame for embedding form to the websites, you have to deal the script conflict if you want to use script block.
Did you try to with steps my colleague provided?
Also is this issue happening just on your Mac or issue is connected to other computers?