Greasy Fork is available in English.
When inputting kanji with an IME, furigana is automatically added.
very experimental - there are likely many bugs
This script adds a button (labeled "F") to the reply box in the WaniKani forum. Clicking this button switches between 3 modes:
- off: nothing happens
- on: furigana is added as soon as an entry has been chosen in the IME.
- blur: same as on, but the furigana is marked as spoiler - so it is blurred until clicked
Since this script uses your input as furigana, you have to write the whole word before selecting an entry from the IME. If you stop at ふりが and then select 振り仮名 from the IME suggestions, you will get 振り仮名.
For more information about the script see https://community.wanikani.com/t/39109
