File Upload Not Working In Firefox

I have in my asp.net page element is not allowed. It works in Chrome as long as the click is triggered by actual human interaction - even if the click event handler of another element triggers the click event on another. I'm only 90% sure about this, though.

Solution 2:

I had the same problem, you can use this code:

<input id="FileUpload" runat="server"  type="file"  style="height: 22px; onchange="fill();"/>

    <script language="javascript">
    function fill()
    {    
      $("#<%=MyTextBox.ClientID%>").val($("#<%=FileUpload.ClientID%>").val())
    }
    </script>