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The user is running an extension that breaks random pieces of the web page. Obviously that's not the developer's fault.

Monorprice is a business. At the end of the day, anything that stops an order is their PROBLEM. The fault doesn't really matter. No sale = no payday.

If it prevents you from making money it is still a problem.

If you develop for something that is not ad based you need to be aware of and test for these issues.