This isn't it. This extension is now under Google Images Restored backup. Why? Who knows? Why do I have to go on a scavenger hunt for it? I can't blame Google for dinking around with their back end, which sometimes makes this add on nonfunctional. But I can blame the author for moving it around at random, and for discussing only the Chrome extension at his github site. When it works, it's great because Google's use of a vertical tile is brain damaged. I just wish it wasn't continuously difficult to find.