I don't usually use it, but I have a Mac shortcut to switch everything into grayscale.
It sometimes seems to help with my flash and motion sensitivities, perhaps by reducing color contrasts. Has anyone else tried grayscale?
I know f.lux reddens everything to reduce blue-light issues, but red lights can trigger migraines and seizures.
I would prefer to retain color for some purposes, but web design often triggers my migraines and maybe a grayscale Firefox browser would help avoid that?