mute-the-retweets.js

$("ol.stream-items").bind("DOMSubtreeModified", function() {
  alert('Subtree modified');
    $('li.stream-item').each(
		function(i,el){
			if( undefined !== $(el).children('.tweet').attr('data-retweeter') ) {
				$(el).css('display','none').addClass('retweet-quiet');
			}
		}
	);
});