current support: chrome (88+), firefox (101+)

Unofficial Jisho.org extension, to look up Japanese words and kanji on the fly

Available on Chrome Web Store, Firefox Add-Ons

Select some Japanese or English text

right click > Jisho On The Fly > Look Up Definition
default shortcut CTRL + SHIFT + Y

Select some text containing one or more kanji

right click > Jisho On The Fly > Look Up Kanji
default shortcut CTRL + Y

Once you have looked up some kanji, you will be able to generate a printable practice sheet based on your history.