Почему функция js не работает в mozilla?

<style type="text/css">
    .tg {border-collapse:collapse;border-spacing:0;border-style:solid;border-width:1px;border-color:#561;margin:0px auto;}
    .tg td {font-family:Arial,sans-serif;font-size:14px;padding:5px 8px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:#f0f0f0;color:#333;background-color:#fff;}
    .tg th {font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:5px 10px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:#f0f0f0;color:#333;background-color:#f0f0f0;}
    .tg .tg-s6z2 {text-align: center;}
    
    .tg-wrap {
        float:none;
        position:relative;
        padding: 3px;
    }
    
    #calendar3 {
       -webkit-box-shadow: 0px 0px 3px 0px rgba(180,180,180,0.80);
       -moz-box-shadow: 0px 0px 3px 0px rgba(180,180,180,0.80);
       box-shadow: 0px 0px 3px 0px rgba(180,180,180,0.80);
    }
 
    @media screen and (max-width: 767px) {
        .tg {width: auto !important;}
        .tg col {width: auto !important;}
        .tg-wrap {overflow-x: auto;-webkit-overflow-scrolling: touch; margin: auto 0px;}
    }
 
    #calendar3 thead tr:last-child, #calendar3 tbody td   {text-align: center;}
 
        #calendar3 thead tr:last-child {
            font-size: small;
            color: rgb(85, 85, 85);
        }
        #calendar3 tbody td {
            color: rgb(44, 86, 122);
        }
        #calendar3 tbody td:nth-child(n+6), #calendar3 .holiday {
            color: rgb(126, 13, 1);
        }
        #calendar3 tbody td.today {
            outline: 3px solid red;
        }
 
    #polegod {
        width: 100%;
        font-size: 14px;
        font-family: arial, sans-serif;
        border: 1px solid #ccc;
        height: 30px;
        padding-left: 15px;
        }
    #polegod::-webkit-inner-spin-button { opacity: 1; }
    
    th.tg-s6z2:nth-child(1) > select:nth-child(1) {
        padding-left: 15px;
        height: 30px;
        border-radius: 3px;
    }
 
</style>
 
<div class="tg-wrap"><table id="calendar3" class="tg">
    <thead>
    <tr>
        <th class="tg-s6z2" colspan="4"><select>
            <option value="0">Январь</option>
            <option value="1">Февраль</option>
            <option value="2">Март</option>
            <option value="3">Апрель</option>
            <option value="4">Май</option>
            <option value="5">Июнь</option>
            <option value="6">Июль</option>
            <option value="7">Август</option>
            <option value="8">Сентябрь</option>
            <option value="9">Октябрь</option>
            <option value="10">Ноябрь</option>
            <option value="11">Декабрь</option>
        </select></th>
        <th class="tg-s6z2" colspan="3"><input type="number" id="polegod" value="" min="0" max="9999" size="4"></th>
    </tr>
    <tr>
        <td class="tg-s6z2">Пн</td>
        <td class="tg-s6z2">Вт</td>
        <td class="tg-s6z2">Ср</td>
        <td class="tg-s6z2">Чт</td>
        <td class="tg-s6z2">Пт</td>
        <td class="tg-s6z2">Сб</td>
        <td class="tg-s6z2">Вс</td>
    </tr>
    </thead><tbody></tbody></table></div>
 
<script>
    function Calendar3(id, year, month) {
        var Dlast = new Date(year,month+1,0).getDate(),
            D = new Date(year,month,Dlast),
            DNlast = D.getDay(),
            DNfirst = new Date(D.getFullYear(),D.getMonth(),1).getDay(),
            calendar = '<tr>',
            m = document.querySelector('#'+id+' option[value="' + D.getMonth() + '"]'),
            g = document.querySelector('#'+id+' input');
        
        var lastmonth = 32 - new Date(g.value, m.value-1, 32).getDate();
            if (DNfirst != 0) {
                for(var  i = DNfirst; i > 1; i--) calendar += '<td style="color: Gray">' + (lastmonth-i);
            }else{
                for(var  i = 6; i > 0; i--) calendar += '<td style="color: Gray">' + (lastmonth-i);
            }
        
        for(var  i = 1; i <= Dlast; i++) {
            if (i == new Date().getDate() && D.getFullYear() == new Date().getFullYear() && D.getMonth() == new Date().getMonth()) {
                calendar += '<td class="today">' + i;
            } else {
                calendar += '<td>' + i;
            }
            if (new Date(D.getFullYear(),D.getMonth(),i).getDay() == 0) {
                calendar += '<tr>';
            }
        }
        
        var dayaftermonth = 1;
                    for(var  i = DNlast; i < 8; i++) {
                      if(i > DNlast) {
                        calendar += '<td style="color: Gray">' + dayaftermonth;
                        dayaftermonth ++;
                      }
                    }
                
        document.querySelector('#'+id+' tbody').innerHTML = calendar;
        g.value = D.getFullYear();
        m.selected = true;
        if (document.querySelectorAll('#'+id+' tbody tr').length < 6) {
            document.querySelector('#'+id+' tbody').innerHTML += '<tr><td>&nbsp;<td>&nbsp;<td>&nbsp;<td>&nbsp;<td>&nbsp;<td>&nbsp;<td>&nbsp;';
        }
        document.querySelector('#'+id+' option[value="' + new Date().getMonth() + '"]').style.color = 'rgb(230, 33, 33)'; // в выпадающем списке выделен текущий месяц
    }
    Calendar3("calendar3",new Date().getFullYear(),new Date().getMonth());
    document.querySelector('#calendar3').onchange = function Kalendar3() {
        Calendar3("calendar3",document.querySelector('#calendar3 input').value,parseFloat(document.querySelector('#calendar3 select').options[document.querySelector('#calendar3 select').selectedIndex].value));
    }
</script>