Be careful with old versions!
*Added a checkbox to change to an alternate flag for Chinese in the "Chinese" tab in the add-on's options dialog
*Added one click to toggle on/off if only 1 language is installed
*Added toolbar icons (right click on the toolbar, click 'customize' and you can drag them from here to the toolbar)
*Added a 'Perapera-kun' entry to the right-click popup menu, and to the 'Tools' menu
*Fixed issue where all of the Chinese definition wasnt being displayed from the CC-CEDICT
*Fixed issue where some incorrect meanings were displayed due to some Simplified hanzi having a different meaning in the Traditional character set
*Tweaked the logo a little bit
*Updated to work in Firefox 2.0
* The enter key can now be used to switch between the dictionaries. Thanks to Charles for the hint on how to make it finally work on a Mac. :)
* The kanji display is now configurable.
* Fixed a problem in preferences that prevented the display of some options.
Also he updated it to use a newer version of the EDICT so I also recommend downloading that too, you can find it at his site http://www.polarcloud.com/rikaichan/