Rated 3 out of 5 stars

Since FF 46, zooming ends with top of image being cropped out of view, while scroll bar shows page is maxed-out in up position. Problem persists whether from mouse scroll or choosing zoom value from context menu, also from either image being viewed alone or from inside a web page. Uninstalling / reinstalling changes nothing. Images of proof from ImageZoom website; https://github.com/jasadams/imagezoom/issues/33.