Rikaichan

Japanese to English/German/French/Russian dictionary. Just hover the mouse on top of a word, and a popup appears. Automatically de-inflects verbs and adjectives. Detailed kanji view...

Dictionary Files are listed here and available under CC-BY-SA v3.0 license
http://rikaichan.mozdev.org/getdic2.html

The developers mention that the rikaichan xpi must be extracted like an archive to see the source code


Captures d'écran

Rikaichan