В Chrome предупреждение не отображается, в IE работает нормально

In Chrome alert is not showing, In IE working fine. While click on other tab in chrome refreshing the tab because of ajax call, I want keep ajax call as it is but before that show the alert -"You can enter only manual hours"

if (parseFloat(time_compare) >= parseFloat(stopTimer)){
  //$(".end-time-timesheet").trigger("click");
  var count = 0
  if (count == 0){
    alert("You can enter only manual hours.");
    count = count + 1
  }
  if (count == 1){
    clearInterval(handler);
    var isstart1 = 0;
    var ticket_no1 = "";
    if ($("#ticket_no").val()! = ""){
      ticket_no1 = $("#ticket_no").val();
    }           
    $.ajax({
      async: false,
      type: 'get',
      url: '/check-timesheet-isStart?user_check='+@user_check+'&currentSelectedDate='+currentSelectedDate,
      data: '',
      success: function (data) {
        if (data != ""){ 
          var url = "/saveTimesheet?ajax=1&isstart = "+isstart1+"&date = "+currentSelectedDate+"&ticket_no = "+ticket_no1+"&t = "+Date.now();
          $.ajax({                        
            async : false,
            type : 'post',
            url : url,
            success : function (data) {                             
              window.location.href=window.location.href;
              jQuery(".timesheet-wrapper").html(data);
              calculateTotalHour();                           
              //$("#pop-box-over").hide();                            
            }
          });
        }else{
          window.location.href=window.location.href;
        }
      }
    });
  }
}