Javascript 在Firefox中隐藏元素时，Youtube播放停止

我正在尝试在Youtube视频播放时隐藏它。在Chrome中，它工作得很好，但在Firefox中，隐藏时播放停止

这是我点击隐藏按钮的代码

隐藏类

.hidden {
        position: absolute;
        left: -10000px;

    }

一个.flash包装器的示例

<div class="flash-wrapper Jj6yXxVc21Y">
<div id="Jj6yXxVc21Y">
  You need Flash player 8+ and JavaScript enabled to view this video.
</div>
    <script type="text/javascript">

        var params = { allowScriptAccess: "always" };
        var atts = { id: "Jj6yXxVc21Y" };
        swfobject.embedSWF("http://www.youtube.com/v/Jj6yXxVc21Y&enablejsapi=1&playerapiid=ytplayer", "Jj6yXxVc21Y", "250", "25", "8", null, null, params, atts);

    </script>
</div>

---

我改变了。隐藏到下面的代码，现在播放不会停止

.hidden {
    margin-top: -1000px;
}

.flash-wrapper {
    float: left;
    margin-left: 5px;
}

.hidden {
    margin-top: -1000px;
}