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.
© 2006 - 2018 Martin Ivanov