Rated 4 out of 5 stars

Από τον/την knoa.jp στις Νοέμ. 6, 2011 · μόνιμος σύνδεσμος

Maybe it doesn't work for Japanese users these days.
It causes by breaking Japanese language file, so I fix it.

Here is Japanese compatible version.
http://knoa.jp/up/imagetweak.0.23.ja.xpi

Detail of this problem is here:
https://github.com/CAFxX/ImageTweak/issues/18