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.

Doesnt Work in Firefox for Mac

good but heavy

Quand je l'ai essayé pour prendre la couleur d'une image, il a juste fait ramer Firefox pendant un moment en refusant de sélectionner la couleur. C'est dommage, mais l’extension ne sert du coup à rien.

It doesn't appear to work at all.

I select the eye dropper and firefox tells me "ColorZilla is causing firefox to slow down"