Here you can find the Rikai-chan mod, developed and programmed by the koohii.com user cb4960. Meanwhile it has a new name – Rikai-san. (why not 様? Sounds mightier to me :P)
Lots of improvements and features were added to the original Rikai-chan addon for Firefox by polarcloud. Rikai-chan appears to be one of the most useful tools besides Anki SRS for Japanese learners (and indeed eases their lives!) If you have troubles, suggestions or demands you can post them into the comment section below, if you have a wordpress account or anything else that can log you in, or just in this thread, if you are a member of the koohii community already. If you have high demands and lots of “<3” left for cb4960 ask him for his bank account and give him some bucks and don’t be so greedy :P
Current Version: Download v13 (uses updated Rikai-chan v2.03 version)
Release Date: 3rd July 2011
Compatibility: Firefox 5.0 (and perhaps up to 7.0?) confirmed, all features work – for me at least..
▲ Added EPWING Support!
▲ Support for JDIC audio. Hover over a word and press “F” to hear the audio for that word. (Linux/Mac users: mplayer must be installed).
▲ Sanseido Mode. This allows you to hover over a word like usual, but instead of the normal J-E EDICT translation, you will see the definition taken from the J-J sanseido dictionary site. Press the “P” key to toggle on/off.
▲ Additional save options in the Clipboard & Save options tab. See screenshot further down in this post. (This feature was originally merged from wrightak’s rikaichan mod).
▲ Ability to add cards directly to your Anki deck using Anki’s “Real-Time Import” plugin. Instructions on how to setup and use are further down in this post. (Linux/Mac users: you must have bash and python installed).
▲ “Super Sticky” mode. Allows you to only see the definition when you Ctrl-click on a word (as opposed to mousing over it). Press the “U” key to toggle on/off. Tip: Ctrl-Right click a word when it resides in a link (so you don’t follow the link).
▲ Clicking the Heisig label/number in the kanji view (via lookup bar, sticky mode, or “Click-to-popup” mode) now links to the corresponding RevTK study page.
1) Uninstall your current rikaichan (if applicable). Only uninstall the main extension, not the dictionaries.
2) Download the JDIC audio enabled version of rikaichan from the link above (it’s a .xpi file).
3) Open the downloaded .xpi file with Firefox and click the Install button when prompted.
4) Download the official rikaichan dictionaries if you don’t already have them.
General Usage Instructions:
Hover over a word and press the “F” key. Linux/Mac users: mplayer must be installed.
Change audio playback volume:
1) Open the rikaichan options and select the General tab.
2) In the Audio Volume box, Enter a value in the range 0-100 with 100 being the loudest.
Using the advanced save feature
1) Open the rikaichan options and select the Clipboard & Save tab.
2) Select a save file. If you would like to save audio clips, select an audio save directory.
3) Adjust the formatting options to suit your needs.
4) Click OK.
5) Hover over a word and press the “S” key.
Enable/Disable Sanseido Mode
Hover over a word and press the “P” key to toggle on/off. At this point, Sanseido Mode will stay enabled until toggled off.
Enable/Disable “Click-to-popup” mode
Hover over a word and press the “U” key to toggle on/off. Now, just hold down the Ctrl key and click on a word to see its definition.
For more instructions, help and details checkout the thread linked above, thanks.