A good resurection of Image Zoom extension Rated 5 out of 5 stars
It is awesome that you've created this extension and especially that it is restartless. But could you please provide some settings?
Over the years of using Image Zoom extension - I really got used to holding Right Mouse Button + scrolling down/up to increase/decrease the image.
Left Mouse Button is not a wise choice: it may automatically do some actions on the page (even if you didn't release the button) and that happens way more often than sites use the same kind of handler for Right Mouse Button click.
Actually, I'm not happy at all that Image Zoom is dead long ago (it's development stopped, but it still works), as it is not restartless and works only when you have a mouse with a wheel (I got netbook with touchpad, and of course it doesn't work there), but I'm also not really happy with your extension as it breaks drag-n-drop completely, so I insistently suggest you either to add settings or change the LMB to RMB (or maybe MMB).
Version 1.2 has been uploaded, and is yet to be reviewed by Mozilla but you can try it out if you can't wait. The new version fixes and improves several things though the most important change is that LMB has been swapped with RMB.