Firefox 4.0.1 (or 5.0) will not display "Terms and Conditions" link content - online registration site, why? (Note Firefox 3.6.18 will).

Hi,
At the "URL of affected site", below, the "Terms and Conditions" link will not work on machine1 with Firefox 4.0.1, cookies and caches cleared (I clear "temp" directories too). I updated to Firefox 5.0, the "Terms and Conditions" link still won't work.
Note that other 'pop up' windows encountered while navigating through the parts look up function (i.e. http://www.fordparts.com/Default.aspx#tabs-2) on that site appear to work fine, with or without pop up windows enabled, in this install of Firefox 4.0.1.
As a sanity check, I tried the link on machine2, which uses Firefox 4.0.1 also, Windows XP. The "Terms and Conditions" link will not work there either.
I tried the link on a third machine, with Firefox 3.6.16, also Windows XP, and the "Terms and Conditions" link *does* work there.
So this would seem to be an incompatibility with Firefox 4.0.1 and/or 5.0. Any ideas [besides regressing back to Firefox 3.6.16 :) ].?
Regards,

No errors in error console. No effect using *. I tried using the dns name of my localhost both in the Firefox URL and in the javascript and I get exactly the same. I have spent a huge amount of time looking into this issue.
One thing I noticed is that if I use the examples on the internet (http://arunranga.com/examples/access-control/preflightInvocation.html or http://saltybeagle.com/cors/) they work in the same browser. These examples however, are accessed through HTTP proxies.
I am wondering if the issue has to do with using the same hostname just with different ports.

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