Sadly it doesn't work anymore, but there are already alternatives as mentioned in other comments.

As of Jan 2023 it no longer works.

Sadly, this one doesn't work anymore.
You can use "Lap Clipboard Inserter" instead.

You can find a fork of this extension “Lap Clipboard Inserter” that fix deprecated execCommand”

Kein Vergleich zu Clipboard Histoy Pro aus Chrome. Ich finde hier keine kopierten Texte. Deinstalliert