Layer editor freezes

After the last update when I try to edit my layer it freezes
in Firefox i get this popup,

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Warning: Unresponsive script

A script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue.

Script: http://usmeu.com/wp-content/pl…s/ckeditor/ckeditor.js?ver=2.6:283

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And this code shows on the web page instead of the jpg

“<p><img style=”” max-height:”=”” alt=”” a=”” src=”http://52.71.180.112/wp-content/uploads/2015/03/app_store.png”&gt;</p>”

Whats going on?

https://ww.wp.xz.cn/plugins/ml-slider/