Permission denied to get property Element.childNodes
I was recently doing a small JavaScript/XML project. Everything was working fine locally, but when I tried to test it out on my server, I got a “Permission denied to get property Element.childNodes” error in Firefox. Internet Explorer had no problems.
Turns out I had the Firebug add-on installed in Firefox. I had to disable this, and everything worked.
You will also have a problem on the w3schools site, if you try to use their “Tryit Editor” to view any code. You will need to disable the add-on in order to get the output of the right-side box to display correctly.