Yes...from the old standby: Free Technology for Teachers

Earlier this week I recommended Pixlr to someone who needed a quick way to resize and change the colors of an image. Pixlr offers a large set of image creation and editing tools. One of the tools that can be quite handy is Pixlr Grabber. Pixlr Grabber is Pixlr's screen capture tool. Pixlr Grabber is available as an extension for Chrome or Firefox. Using Pixlr Grabber you can capture your screen, crop the screen image, and print what you like. You can also send the image to Pixlr Editor for further editing options. (from Free Technology for Teachers)