We worked on this problem some more and got it solved, at least for ThinkingPlus. If firefox is crashing or hanging for you while visiting this site, then the first thing you should try is upgrading your Java Runtime Environment. It's free and can be downloaded here: http://java.com/en/download/index.jsp
PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
ERROR: The request could not be satisfied
504 Gateway Timeout ERROR
The request could not be satisfied.
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Generated by cloudfront (CloudFront) HTTP3 Server
Request ID: CYJ0yH9s5o_i4DhSHLfytivLbkaqW8M2qwPp81hdG_kzbywkxZSQtg==