After upgrading to MacOS Mojave and switching to Night Mode, the dark icon looks out of place. See: <img width="242" alt="Image Block X icon on dark Firefox theme" src="https://user-images.githubusercontent.com/2207096/46260978-09070080-c4a2-11e8-9d8e-875fe89914e0.png"> **Expected behaviour** On switching to dark themes, the icon should switch an inverted colour scheme.
After upgrading to MacOS Mojave and switching to Night Mode, the dark icon looks out of place.
See:
Expected behaviour
On switching to dark themes, the icon should switch an inverted colour scheme.