はてなグリースモンキー

// ==UserScript==
// @include        http://d.hatena.ne.jp/sample/
// ==/UserScript==

(function(){
	var divs = document.getElementsByTagName('DIV');
	for (var i in divs)
	{
		if (divs[i].className == 'commentshort')
		{
			var comments = divs[i].getElementsByTagName('P');
			for (var j in comments)
				if (comments[j].innerHTML)
					comments[j].innerHTML = comments[j].innerHTML.replace(/^(<.+>).*$/, '$1 &#x300e;&#x3053;&#x3093;&#x306b;&#x3061;&#x306f;&#x3001;&#x304b;&#x308f;&#x3044;&#x3044;&#x72ac;&#x3067;&#x3059;&#x306d;&#x3002;&#x300f;');
		}
	}
})()

もうあれなのであれですね