FlipClock.js在Chrome上工作正常但不依赖于Firefox

Question

我遇到了FlipClock.js的麻烦。下面我提供了我网站上的代码示例：

HTML部分：

 <div class="row">
     <div class="col-md-2"></div>
     <div class="col-md-8 text-center">
          <div id="buttons">
               <div class="my-clock"></div>
          </div>
     </div>
 <div>

和javascript部分：

    <script type="text/javascript">
        var clock;

        $(document).ready(function() {

            // Grab the current date
            var currentDate = new Date();

            // Set some date in the past. In this case, it's always been since Jan 1
            var pastDate  = new Date("2016-02-20 10:00:00");

            // Calculate the difference in seconds between the future and current date
            var diff = pastDate.getTime() / 1000 - currentDate.getTime() / 1000;

            // Instantiate a coutdown FlipClock
            clock = $('.my-clock').FlipClock(diff, {
                clockFace: 'DailyCounter',
                countdown: true
            });

        });
    </script>

这里是Chrome的屏幕：

和Firefox：

在Firefox中，计数器根本不起作用。我能做错什么？