Hmmm...
The only real change, that was done - in javascript file. 2 function (event hooks) were done less intrusive. With inreritance, instead of bulk override. There're no any "new" line of code, just more correct event handling. XML has only cosmetic change of single template, to enforce browser load new JS instead old one from cache.
Seems, problem can be in your FF (?), because no problems in my FF 3.0.7/Vista & FF/Linux. But I can't imagine how your addons can break anything, if noscript doen't block anything at your site.
No ideas, really. I'm not javascript expert. May be, php/mysql/other, but not javascript