Well I don't know about you guys, but I grab a lot of images off the web to play with in Photoshop. Lots of time wasted in downloading an image, loading up Photoshop and finding out it's too low-res or it's got artifacts up the ying-yang.

Which is why I use...drumroll please... Image Zoom in Firefox. It allows you to click on the image and then right-click to zoom up.

That's all it does. But what it does is just perfect.