URL redirection causing error

I’m using a script to redirect users to a new URL after submitting a form. The form was generated by the MailPoet newsletter plugin. The script is working in Chrome (latest version) and IE but is causing an error in Firefox. In Firefox the redirect script is still working but before the page redirects there is an error message.
The form is located at the following URL: http://goo.gl/b7fkuF

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