Very useful. Loses one star for losing the context menu from time to time. Has to be fixed by deinstalling and reinstalling.

A very useful extension, I use it from time to time, when I see an exotic character or something dubious.
Alas, it hasn't been updated in 4 years, it uses an old database (Unicode 13) and more importantly, I no longer see the context menu, perhaps because of some Firefox update.
I hope somebody will update it to work again.