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version 0.16 was great, but in versions 0.17 and 0.17.1 zooming pictures with mouse wheel does not work for me. So I also had to downgrade back to ver. 0.16.

Это отзыв для предыдущей версии этого дополнения (0.17.1). 

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.