With Firefox 57 looming on the horizon, this is the only extension that I
have that won't work with it.
I tinkered with XFCE's notification settings manager, until native
notifications look sort of like Firefox's own notifications, but the native
ones are still much more compact, take up much less screen real estate, and
are much less intrusive.
Anyone know of any 57+-compatible alternative, to keep using Firefox's
notifications, instead of the system ones?