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» Firefox v57+
Please note that Firefox v57+ no longer supports XUL-based addons like Rikaichan.

You can find alternative versions of Rikaichan (made by others) that will work in Firefox 57+ here:
If you still want to use this version of Rikaichan, you will need to use a Firefox-based browser that still support XUL-based addons like Firefox ESR (until around May 2018), Waterfox, Pale Moon and Basilisk.

» Rikaichan 3.xx
» Rikaichan 2.xx
» Installing in Thunderbird?

Dictionary Files

Please install one or more dictionary files to use with Rikaichan.

Unsigned Dictionary Files

The files listed below are updated more frequently than those listed above, but they are not "signed." These files will only work on Firefox versions that do not use signature verification or on versions that will allow you to disable it. Examples: Firefox ESR, Waterfox, Pale Moon and Basilisk.

Thunderbird can use both signed and unsigned addons.