The code isn't working in firefox, works great with other browsers

The code isn't working in firefox, works great with other browsers

Firebug gives me a warning "This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1."
but I don't think that's the problem

Do you have any thought how to help?

  1. <script type = "text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
  2.      <script type = "text/javascript">
  3.           {
  4.             var Fname = document.getElementsByName('FirstName')[0];
  5.             var Lname = document.getElementsByName('LastName')[0];
  6.             var Email = document.getElementsByName('Email')[0];
  7.       
  8.             $.ajax({
  9.                 url: "https://docs.google.com/forms/d/1hOViTOAdde6WgAdPFlobHzrNGhfZZ781Ba6EDC54kVs/formResponse",
  10.                 data: {
  11.                     "entry_2018163929":Fname.value,
  12.                     "entry_2125985135":Lname.value,
  13.                     "entry_863726964":Email.value 
  14.                 },
  15.                 type: "POST",
  16.                 dataType: "xml",
  17.                 statusCode: ""
  18.             });
  19.             clear();
  20.         }
  21.     </script>