It conflicts with Scrool Zoom by Armen Sebastian. They both use Scroll + Right Mouse Button.
Unfortunately I had to uninstall because the other extension is more useful for me, but I hope I can use your extension when it can work together with another xtension. Please modify it this way: a) when I Scroll+RMB above the IMAGE = your extension works/zoom the image. b) When mouse pointer is above non-IMAGEarea = Armen's extension works/zoom the webpage, please? Solve the conflict between them. Hope to see you back one day!