It's a start but has long ways to go before it is actually useful. As is, its a way to maybe display a image you pre-made a pixel grid on over your wplace page for you don't have to go back and forth but as something like Wplace Helper for chrome, it is not.

useless for pixel art - you can't position and size pictures relative to the canvas, only relative to your viewport

Works well but it can be a bit tricky to get the images to overlap the pixels correctly