This add-on was fine until recently, but then a problem appeared when just an image is loaded in a tab. When the image natural size is taller then the tab vertical size, the image loads shrunk to fit, and on clicking on the image to full-size it, the image goes to full-size and centred, so some of the imaage is above and some below the viewable area. So far, so normal. But the problem is that the top of vertical scroll bar is only the top of the initially viewable area in the centred full-size image. The bottom of the scrollbar is the actual bottom of the image so I can scroll down to see the bottom of the full-sized image, but I can't scroll up to see the top of the image above the top of what was visible centred and full-sized. This is with me not explicitly using the extension by clicking on it, but actually clicking on Zoom Page WE and zooming that way produces the same effect, and disabling the extension removes the problem. This makes the extension unusable for me as it is, and I've had to switch to a different zoom page extension. I'll switch back and check if the problem is fixed or not when updates appear.