Works very well. I'll give it another star or two when it a look-up bar is added. I might also give it another star if it adds the option to access the preferences without navigating to them through the add-ons page; or if other languages are added.

It would also be nice if the colour of the active "理" button for the black-purple-green colour scheme was consistent with the others (that is, having the character "理" be the same colour as kanji are in the popup — in this case, purple).