For really long forms: Alert user with pop-up verifying they want to leave the page in case multiple form entries have not been saved/submitted

For long forms, users often enter a large amount of time-consuming data. They then accidentally browse away from the form causing all of the non-submitted data to be erased.

Can you add an option in the Form Options to prompt the user with a pop-up asking the user if they really mean to browse away from the page and to remind them to submit any un-submitted data before doing so?

That would be great!