Mark up any web page with Wired Marker for Firefox
This isn't the first application we've seen that lets you markup web pages like old textbooks. But unlike Awesome Highlighter, Wired Marker is integrated with your web browser, so you don't have to enter the URL of the page you want to mark into a separate web application first. Just right click anywhere on any page, select Wired Marker, and pick your color.
[via Digital Inspiration]