Iframely for Gmail

Iframely for Gmail (currently known as Iframely URL Previews) is a Chrome browser extension that lets you open an email attachment or URL in a popup iframe.

It is simple script that looks for plain URL links on pages you visit and appends [show] to its end. Once you click on [show], Iframely will grab the URL preview and show it just under the link. You can click [hide] to close the preview.