Unable to get property ‘firstChild’ of undefined or null reference – Error accessing Microsoft CRM
You might have received this annoying popup error while accessing Microsoft CRM. You might wonder if there is anything wrong with the Jscript customization in your solution! This is actually a browser related problem and you can fix it quickly.
Resolution: Add the CRM url to the ‘Trusted sites’ list and you would not get this issue. Its related to the activex control access.