can't log into chase credit card account, keeps telling me to upgrade browser. i have no problems logging into all other sites

Hi

It seems that Chase no longer supports your Firefox 52 browser. This is likely because of lacking support for the JavaScript used on this page. With Windows XP you are out of luck because you can't update beyond 52.

We don't support this browser version anymore. Using an updated version will help protect your accounts and provide a better experience.

You might need to use Internet Explorer 11 with the site. Does that work?