clear all yammer messages

clearinbox.js

var goBack = function() {
    history.back();
    setTimeout(clickLink, 400);
}
var clickLink = function() {
  var $element = jQuery('.yj-unread-item a:first');
  var $moreLink = jQuery('#moreButton button');
  if ($element.length) {
    $element.click();
    setTimeout(goBack, 400);
  }
  else if ($moreLink.length) {
    $moreLink.click();
    setTimeout(clickLink, 1000);
  }
}
clickLink();