Lomanic

javascript:(function(){var newDiv=document.createElement("div");newDiv.setAttribute('id','qrcodeonfly');newDiv.innerHTML='<div style="position:fixed;top:50%;left:50%;z-index:99999;width:550px;height:550px;margin-top:-275px;margin-left:-275px;background-color:#fff;padding:49px;border:1px%20solid #ccc;box-shadow:0 0 20px rgba(0,0,0,0.3);"><img src="http://chart.apis.google.com/chart?cht=qr&chs=545x545&choe=UTF-8&chld=H&chl='+window.location+'"/><a href="javascript:(function(){document.body.removeChild(document.getElementById(\'qrcodeonfly\'));})()" style="display:block;position:absolute;top:-7px;right:-7px;color:#eee;font-family:verdana;font-size:18px;width:14px;height:14px;line-height:10px;text-align:center;cursor:pointer;font-weight:bold;background:#000;padding:3px;text-decoration:none;border:solid 3px white;border-radius:50%;box-shadow:0 0 5px rgba(0,0,0,0.5);">x</a></div>';document.body.appendChild(newDiv);})()

Lomanic

Chrome install - drag + drop onto extensions window at chrome://extensions