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Onepage checkout jump back to cart in Firefox

Onepage checkout jump back to cart in Firefox

My Magento 1.9.0.1 has the issue in FireFox , when customers fill their delivery information and click on "continue" it will jump back to cart page. This problem only appears in Firefox. With debug in FireFox, it shows

 

NetworkError: A network error occurred.


Anyone has the same issue, or have an idea about how to fix it?