The peraperakun plug-in gives pop-ups for words and phrases and it was written specifically for students of Japanese and has been around for a long time. https

The peraperakun plug-in gives pop-ups for words and phrases and it was written specifically for students of Japanese and has been around for a long time. https://addons.mozilla.org/en-US/firefox/addon/3343 https://addons.mozilla.org/en-US/firefox/addon/3343