I noticed an interesting issue with FireFox 3 and FireBug 1.2.0b3.
Certain sites using the XmlHttpRequest object, parse xml data or the scripts use the
call method Element.getAttribute()“. This happens when FireBug is enabled.
If you disable FireBug (Tools > Add-ons > FireBug > Disable) and then
restart FireFox – the problem is gone.
I believe the FireBug guy is aware of this issue and will fix it soon, as
the latest FB is still in a beta version.
Test with FireFox 3 and FireBug 1.2.0b3 on / off this page: http://www.w3schools.com/Xml/tryit.asp?filename=tryxml_parsertest.