This only happens on the PostArticle.aspx page.
The error is:
Error: document.all is undefined
Source File: http://www.dotnetfunda.com/post/?ReturnUrl=/post/postarticle.aspx
The code it has a problem with is:
function ValidateCheckBox(source, args)
if(document.all["ctl00_PlaceHolderContent_chkAgreed"].checked == false)
alert("You must agree (check the checkbox) to proceed.");
args.IsValid = false;
Which looks like a custom validator but I don't know which checkbox it is trying to validate.
Document.all is an IE only dom technique.http://www.google.co.uk/search?q=document.all+firefox