Best colorpicker for firefox Waardering 5 van 5 sterren

This replaced the colorpicker from the dev tools that was deprecated for no reason and you don't have to open dev tools to use it, it's just one click away. I'm on firefox 55.0.2(64-bit) now and it still works. I've had it for a long time. I don't get it why it doesn't let me add it since it works. Maybe an update form the dev?