Polyfill pop up?

Hi, sorry if this would be the wrong place but I can't find concrete information online. I got a polyfill pop up on a website I buy hobby models from. It popped up when placing the order before being sent to the Stripe(?) page where you insert card info. I didn't fill anything and just pressed cancel on it, nor download anything. My order went through as usual. Should I be worried here? Could somehow my card info be compromised? Stripe page looked