javascript api code sample fails in firefox

[youstupidgithub]

re: the javascript code sample on the ipify home page:

<script` type="application/javascript">
  function getIP(json) {
    document.write("My public IP address is: ", json.ip);
  }
</script>

<script type="application/javascript" `src="https://api.ipify.org?format=jsonp&callback=getIP"></script>

that exact code works in edge, chrome, brave, and safari. but i can't get it to generate anything in firefox. (i tested it in firefox on various PCs and i verified that javascript is enabled in the test firefox browsers.) it doesn't even output the "My public IP address is:" string; let alone the ip address.

any thoughts? fixes? thank you very much!!!!!