This is extremely useful. Before a few years back, Google image included a link to view the original image for each result of an image search, which they intentionally removed, and this restores it. I think this might have related to liability with copyright holders or site owners, and, despite how odd it is that a company would intentionally nerf the functionality of its own service, I would have given them the benefit of the doubt, but they also removed other features which added a lot of value and saved time, like the ability to display an overlay of the pixel dimensions of each result (of all at once in the grid view, not individually when previewed in the side panel, which is still available), which is much less understandable, and they didn't stop there. They've repeatedly expended resources to break any tools that people create to restore any of the removed functionality and confounded the page code to frustrate future attempts. It is pleasantly surprising that we can still restore at least this element, but I'd rather see other search engines catch up across the board.

Lightweight (18 kb), and works well for getting a direct link to images in Google images.