Firefox error : not well-formed

Today I was working with jQuery AJAX request and got an error in Firefox's JavaScript console saying "not well-formed".

Actually I was returning HTML code for a drop-down from server.

Following solution worked for me.

I altered my AJAX request as follows :

$.ajax({  url: "http://abc.com/",  beforeSend: function ( xhr ) {  xhr.overrideMimeType("text/plain; charset=x-user-defined");
} }).done(function ( data ) {
console.log('Data Received!!');
}); 

Did this save your day?