For people with the newer front window privacy shade.
In reference the falling windshield shades my wife has crafted this simple and inexpensive solution.
She purchased two Air Dog Squeaker mini-tennis balls, 1 3/4 inch diameter, at a PetSmart, and squeezed them into the tracks below the shade's rollers and above the driver's line of sight. They're pliable enough to fit in when squeezed into place, then expand and hold fast. If the shade should fall the tennis balls are in tight enough to hold the shade up and out of the way. Only problem now is convincing the dog that these squeaking tennis balls are important
technical equipment.
Jack