Simple, quick and easy to use.

Genau das was ich seit Jahren gesucht hab

Slow and clunky. It changes the disposition of the web page when launched, which may cause troubles. Sometimes, it just doesn't pick the color of the pixel I am aiming at. Finally, it takes some time to show up.

This extension used to be very helpful for CSS/HTML/general design, but lately it's freezing on every page I use it on.

Working great in Firefox 79.0b9
However, in Private Browsing (run in Private Window permission = Allow) it stops working.