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» Firefox v57+
Please note that Firefox v57+ will no longer support XUL-based addons like Rikaichan. XUL-based addons are still supported in Firefox ESR (for now), and Firefox-based browsers like Waterfox and Pale Moon.

Thanks to Kalamandea for working on a WebExtension-based version that is compatible with Firefox v57+. It's not yet complete, but you can checkout his work at GitHub.

There is also an alternate version called Rikaichamp at AMO that is compatible with Firefox 57+.

» 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 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, Firefox Developer Edition, "Unbranded" Firefox.

Thunderbird can use both signed and unsigned addons.