Editors' Note: The Download Now link will redirect to the extension page. To install the extension directly, click on the install button on the page.
When it's activated, when you hover over Japanese words they'll be translated in a pop up. If you hit shift/enter, you'll see some information about the first Kanji. Another similar plugin was made a few months back so I almost didn't continue this endeavor, but in the end, I decided that the other project wasn't really active and more importantly, that rikaichan worked well so I wanted a project that built upon the great work Jon and his compatriots have already completed.