Javascript multiple file upload with progressbar does not work in firefox, please help

Question

I want to upload files using this javascript snipped as well as processing non file fields on the same form. This works beautiful in IE11, Chrome and Opera, but not in firefox (version 34).
I fired the non file handler with the action attribute on the <form> like this:
<form id="upload_form" enctype="multipart/form-data" method="POST" action="nonFile.php">
and the javascript with:
<input name="submit" type="submit" style="background: green" value="Submit" onclick="return uploadFiles()"/>
When I change type="button" the file uploads work in FF but the I have no control over the non file fileds.
Can someone gives me an indication of what is wrong?
oXHR.upload.addEventListener("progress", function(e){
var percent=(e.loaded/e.total) * 100;
_(idProg).value = Math.round(percent);
_(idstat).innerHTML = filename.name + " "+Math.round(percent)+"% --- Please Wait";
}, false);
// Upload finish, show the size of the file in Bytes, KBytes or MBytes
oXHR.onreadystatechange = function(){
if (oXHR.readyState == 4 && oXHR.status == 200){
var iBytesTransfered = bytesToSize(filesize);
_(idstat).innerHTML = filename.name + " Size: " + iBytesTransfered + " "+100+"%";
_(idProg).value = 100;
// Upload failed
oXHR.addEventListener("error", function(e){
_(idstat).innerHTML = "Upload Failed";
}, false);
// Upload aborted
oXHR.addEventListener("abort", function(e){
_(idstat).innerHTML = "Upload Aborted";
}, false)

Answer 1

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0, 0,0" width="600" height="360">
<param name=movie value="example.swf">
   <param name="allowScriptAccess" value="always" />
<param name="quality" value="high">
<param name="allowScript" value="opaque">
<param name="wmode" value="opaque">
<embed src="example.swf" quality="high" allowScriptAccess="always" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=Shockwave Flash" type="application/x-shockwave-flash" width="600" height="360"></embed></object>