Fixing the error Permission denied to get property XULElement.selectedIndex in Mozilla Firefox

When working with Mozilla Firefox browser, I usually come across the error below many times.

Usual exception details: Permission denied to get property XULElement.selectedIndex

Error because of my own javascript function:
Permission denied to get property XULElement.popupOpen

I want to write this post because, for me it took long time to solve the issue. May be most of the people may get this error when working with Mozilla Firefox.

Why it is coming? What are the possibilities?

This will come if you are making AJAX calls with a input type text box, then firebug will throw this error. This is because it is a autocomplete functionality. To fix this what you need to do is, just add an attribute to input control as shown below.

<input type="text" autocomplete="off" />

This will stop Firefox from attempting to complete the content in the box.

That's it!!!

Is this helpful?