Review for Moji by ianminjapan
Rated 4 out of 5 stars
Looks very useful. Rikaichan is still the most immediate way of finding the meaning of japanese words in text but when you can't use Rikaichan, e.g. when you're trying to read a PDF in your browser window, Moji is pretty handy. The recently looked-up word list is also very cool.
This review is for a previous version of the add-on (0.9.2).To create your own collections, you must have a Mozilla Add-ons account.