Lately I being requested by my client to make a "popup" "thanks you" page, also noticed that is a lots of forms using this method and I wonder if this feature can be include in the "actions" list like we have the "show thanks you message".
I'm not exactly sure how to do this but I think it's probably possible. Please see this FAQ which describes how to open a from in a lightbox - that may help but you'd need to add code to open the window when the page loads after a form submission.
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