Cant get wheel scroll delta on Firefox

changedlistener = new OnWheelChangedListener() {
   boolean inProgress = false;

   public void onChanged(WheelView wheel, int oldValue, int newValue) {

     if (!inProgress) {
         return;
     }
     inProgress = true;

     try {
         if (wheel.getId() == R.id.month || wheel.getId() == R.id.day || wheel.getId() == R.id.year) {
             updateDays(year, month, day);
         } else if (wheel.getId() == R.id.hijrimonth || wheel.getId() == R.id.hijriday || wheel.getId() == R.id.hijriyear) {
             hijriDays(hijriyear, hijrimonth, hijriday);
         }
      }
      finally {
          inProgress = false;
      }
   }
};

$(document).ready(function(){
var winHeight = window.innerHeight ?
            function() {
                return window.innerHeight;
            } :
            function() {
                return document.documentElement.clientHeight;
            };
$('.first-block').height(winHeight);
var BlockHeight = $('.first-block').height();
$.browser = {};
$.browser.mozilla = /mozilla/.test(navigator.userAgent.toLowerCase()) &&     !/webkit/.test(navigator.userAgent.toLowerCase());
if($.browser.mozilla)
{
 var ScrollType = 'html';
  }
else
   {
 var ScrollType = 'body';
  }
$('.first-block').mousewheel(function(event, delta, deltaX, deltaY) {
  if((delta<0) && ($(ScrollType).scrollTop()==0)) $(ScrollType).animate({ scrollTop: BlockHeight-    104 }, 600);
});

$(ScrollType).keydown(function(event){
 if((event.keyCode==40) && ($(ScrollType).scrollTop()==0)) $(ScrollType).animate({ scrollTop:  BlockHeight-104 }, 600);
})

});

// custom 'scrolldelta' event extends 'scroll' event
jQuery.event.special.scrolldelta = {
    delegateType: "scroll",
    bindType: "scroll",
    handle: function (event) {
        var handleObj = event.handleObj;
        var targetData = jQuery.data(event.target);
        var ret = null;
        var elem = event.target;
        var isDoc = elem === document;
        var oldTop = targetData.top || 0;
        var oldLeft = targetData.left || 0;
        targetData.top = isDoc ? elem.documentElement.scrollTop + elem.body.scrollTop : elem.scrollTop;
        targetData.left = isDoc ? elem.documentElement.scrollLeft + elem.body.scrollLeft : elem.scrollLeft;
        event.scrollTopDelta = targetData.top - oldTop;
        event.scrollTop = targetData.top;
        event.scrollLeftDelta = targetData.left - oldLeft;
        event.scrollLeft = targetData.left;
        event.type = handleObj.origType;
        ret = handleObj.handler.apply(this, arguments);
        event.type = handleObj.type;
        return ret;
    }
};

// bind to custom 'scrolldelta' event
$(window).on('scrolldelta', function (e) {
    var top = e.scrollTop;
    var topDelta = e.scrollTopDelta;
    var left = e.scrollLeft;
    var leftDelta = e.scrollLeftDelta;
  // do stuff with the above info; for now just display it to user
    var feedbackText = 'scrollTop: ' + top.toString() + 'px (' + (topDelta >= 0 ? '+' : '') + topDelta.toString() + 'px), scrollLeft: ' + left.toString() + 'px (' + (leftDelta >= 0 ? '+' : '') + leftDelta.toString() + 'px)';
    document.getElementById('feedback').innerHTML = feedbackText;
});

#content {
    /* make window tall enough for vertical scroll */
    height: 2000px;
    /* make window wide enough for horizontal scroll */
    width: 2000px;
    /* visualization of scrollable content */
    background-color: blue;
}
#feedback {
    border:2px solid red;
    padding: 4px;
    color: black;
    position: fixed;
    top: 0;
    height: 20px;
    background-color: #fff;
    font-family:'Segoe UI', 'Arial';
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id='feedback'>scrollTop: 0px, scrollLeft: 0px</div>
<div id='content'></div>

Private mouseDown As Boolean = False
Private Sub Form1_MouseWheel(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseWheel
    If e.Delta > 0 And mouseDown Then
        Console.WriteLine("Scrolling with button down")
    Else
        Console.WriteLine("Button Not down whilst scrolling")
    End If
End Sub

Private Sub Form1_MouseDown(sender As Object, e As MouseEventArgs) Handles MyBase.MouseDown
    If e.Button = MouseButtons.Middle Then
        mouseDown = True
    End If
End Sub

Private Sub Form1_MouseUp(sender As Object, e As MouseEventArgs) Handles MyBase.MouseUp
    If e.Button = MouseButtons.Middle Then mouseDown = False
End Sub

constructor(props) {
    super(props);

    this.state = {
        visibleStart: 0,
        visibleEnd: 20,
        diff: 20
    };

    this.allowScroll = true;
}

handleScroll(event) {
    if (!this.allowScroll) {
        return;
    }

    this.allowScroll = false;

    setTimeout(function() {
        this.allowScroll = true;
    }, 1000);

    // ...

 }