Форум поддержки Firefox

This annoying notification on the bottom right keeps popping up everytime I take a screenshot. I've been using computers for the past 17 years, I know how to paste things by now. Even worse, it overlays on other applications and pesters me there for about 10 seconds until I close it. Can this notification be hidden in about config or do I have to find a community add on that does the same thing, but without this stupid notification?