Awesome firefox plugin

After getting frustrated running across websites and emails that had lots of Japanese I didn't know, I figured there must be a Firefox addon which could help me out. Enter Perapera-kun ( https://addons.mozilla.org/en-US/firefox/addon/3343 ) this addon is amazing. As you mouse over Japanese words (no matter if they are written in hiragana/katakana/kanji/mixed) it highlights them and tells you their meanings and readings. It's just so useful, it's hard to explain how impressed I am with it, and it's free!