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Unfortunately, it reduces the size of some windows, making some boxes/text go out of bound (check for example in "Tools"->"Options" -> "Composition"), even if all the options of the add-on have been disabled.

Thunderbird : version 3.0.1
OS : Windows XP SP3

Это отзыв для предыдущей версии этого дополнения (0.1.9). 

could you try this and see if it makes any difference
http://choggi.dyndns.org/misc/CuteButtonsCrystalSVG-0.2.1.xpi