在某些情况下，当我在Firefox（51.0.1）中浏览Wordpress（4.7.2）管理区域时，TinyMCE＆＃34;添加媒体＆＃34;按钮不会起作用。此外，在控制台选项卡中打开Mozilla Dev Tools会出现一些JS错误。
TypeError: d(...) is null[Learn More] mediaelement-and-player.min.js:15:6254
mejs.MediaFeatures.init/c.supportsPointerEvents< http://localhost/WP/theme/wp-includes/js/mediaelement/mediaelement-and-player.min.js:15:6254
mejs.MediaFeatures.init http://localhost/WP/theme/wp-includes/js/mediaelement/mediaelement-and-player.min.js:15:6035
<anonymous> http://localhost/WP/theme/wp-includes/js/mediaelement/mediaelement-and-player.min.js:15:7968
TypeError: $(...).not(...).filter(...).mediaelementplayer is not a function[Learn More] wp-mediaelement.js:44:4
initialize http://localhost/WP/theme/wp-includes/js/mediaelement/wp-mediaelement.js:44:4
n.Callbacks/i http://localhost/WP/theme/wp-includes/js/jquery/jquery.js:2:27444
n.Callbacks/j.fireWith http://localhost/WP/theme/wp-includes/js/jquery/jquery.js:2:28213
.ready http://localhost/WP/theme/wp-includes/js/jquery/jquery.js:2:30004
K http://localhost/WP/theme/wp-includes/js/jquery/jquery.js:2:30366
我看到的问题是WordPress正在使用的媒体元素插件。我搜索了网络，看看是否有类似的问题，但无法找到任何东西。有人知道发生了什么事吗？只需提及Chrome中没有问题。