Zoom images/videos on all your favorite websites (Facebook, Amazon, etc). Simply hover your mouse over the image to enlarge it.
This Chrome extension will show an image if you hover over its thumbnail or a link. Also integrates with Reddit Gold to properly sync visited state for images (i.e. purple/blue links) across machines! If you don't care about the Reddit Gold integration, you should just use HoverZoom+ instead as it is more frequently updated.
More details and all source code can be found on the github project page: