ually impaired users depend on hi-con black and cannot see anything on a blinding white screen, it would be a great idea to display notifications in consideration of this necessary accessibility setting for blindness.
the white notification box in the lower right corner only blinds the visually impaired, and it should stay on screen more than 5 sec when have to read with pointer on magnifier.
but first the notifications would have to display in hi-con black instead of blinding white when the device is set to hi-con black.
and later versions of firefox should stop ignoring the color setting for links, because dark blue font on black bg is low contrast and thus not readable by visually impaired users, forced by mozilla to remain on older versions of the browser. some late versions of firefox even display the browser tools/options pages in white when set to hi-con black.
consideration toward blindness requires some intelligence.