Board Thread:Support Requests - Getting Technical/@comment-30579658-20181221031042

I found this script that is supposed to add a box that would display a list of unused files on Special:UnusedFiles, since I don't know anything about Javascript, can anyone confirm if this script is safe to use? if (mediaWiki.config.get("wgPageName") === "Special:UnusedFiles") { $(function {		var str = "";		$('.gallerytext > a').each(function  { str += decodeURIComponent(this.href.substring(this.href.indexOf("File"))) + "\n"; });		var $textarea = $(' ');		$textarea.val(str);		$('.gallery').before($textarea);	}); }  