Hi there:

I haven't tried this, but apparently this javascript should do it:

window.open('', '_self', ''); window.close();

I will let someone with more javascript knowledge comment on it further. ‌ ?

You can create a custom page in SharePoint. When this page loads you can execute Rhia's javascript code.

In Nintex Forms designer, you can set the "Redirect URL" field with the url of the page you've created (in the form settings, then in "Advanced" section).

Hope this helps

Oh man, that's brilliant. Thanks ‌