I haven’t used this modification myself but if you really want to stay on page when an item is added to cart and still want to capture the AddToCart Pixel Event then you can try using this modification. Disclaimer – It may not work for your theme (The only way to find out is by testing with The Facebook Pixel Helper created by Facebook).
If this modificaiton doesn’t work for your theme, make sure to carefully remove all the modificaitons or unpublish the theme modified and replace it with a fresh clean copy of your theme.
James (Tech Support)
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Thanks again from all of us here at Pixel Conversion Pro and remember, you are Awesome!