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 shortcutCTRL
+SHIFT
+Y
Select some text containing one or more kanji
right click > Jisho On The Fly > Look Up Kanji
default shortcutCTRL
+Y
Once you have looked up some kanji, you will be able to generate a printable practice sheet based on your history.