After scrolling FB and refreshing and using it for some time, a display of memory shows it use grabbing more and more memory slowly but surely, starting with 400MB and growing until it approaches 1TB in size.
Close that browser tab, then reopen Facebook and you’ll find it has “shrunk”. WOW.
This is due to Facebook looking for things to show you and it keeps growing like some fungus on your machine.
Use short browser sessions, closing out after brief visits, on all platforms, and using it for short stints, and it works fine.