Seems promising, but there's no Japanese monolingual dictionary — avoid this extension if you want to actually learn the language.

Thank you so much, this is exactly what I have been looking for.

a real find for me

Really useful tool for me

This dictionary is doing all that I could dream of. Instant recognition via mouseover, the dictionary is complete, erudite but also very simple to access if you just want a straightforward translation.
Once you look up the word, you can find the kanji decomposition. It's detailed and easy at the same time. Please try.

I dont remember ever encountering UX breaking bugs on 10ten, nor the previous rikaichamp or the older rikaichan

Amazing extension, this is going to help me a lot to learn Japanese. One feature I wish it had is to display furigana over kanji when on hover. That aside, I'm glad I found this extension. Good job!

Does not work at all.

This is very easy to use. The Japanese accent is really useful when I look up the new words and try to speak them.