Rikaisan is a port of the popular Chrome extension rikaikun, which is an excellent tool for anyone in the process of learning Japanese. Click the icon to activate Rikaisan and it is ready to start translating for you. Simply hover over the text you don't understand and Rikaisan will automatically pick out and look up words and kanjis from the sentence under the cursor.
If you're having problems installing from the Opera extensions page, please restart Opera and try again. This is a problem with Opera and not the extension, please do not downrate because of it.
Stable versionv0.1 (2012-05-18) zip tar
Or clone the git repository:
$ git clone git://github.com/mathall/Rikaisan.git