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It is an excellent add-on, but in the new version (0.17) you have to push the ctrl with the mouse wheel for zoom. In ver. 0.16 using the mouse wheel was enough for the zoom.

I prefer the older method, so I had to downgrade back to ver. 0.16.
I understand that many people prefer the newer method instead.
It would be great to put a checkbox in the option about it (or at least an about:config variable), so everybody could chose the preferred method.

Questa recensione riguarda una versione precedente (0.17) del componente aggiuntivo. 

From version 0.17 onward, the default zooming control has changed to be consistent with firefox's built-in one.
As such, you now has to do ctrl+wheel to zoom (this is the same command used on webpages) and wheel to scroll vertically: this is meant to ease new users that may be used to the standard command.
You have therefore to choose: you can use the new command (rest assured that no-one better than me knows how painful it is: I originally coded this extension for myself and I've been using it with the old control for years!) or go in about:config and set extensions.imagetweak.legacyscrolling to true (this is explained in detail in the online help http://cafxx.strayorange.com/ImageTweak%20Help).
Hope this fixes it for you.