I claim the ornamental design for a support for raising the height of furniture, as shown and described.
FIG. 1 is a front plan view of a support for raising the height of furniture showing my new design in an open position, the opposite side plan view being a mirror image thereof;
FIG. 2 is a front plan view in a compact position, the opposite side plan view being a mirror image thereof;
FIG. 3 is a side elevational view in an open position, the opposite side elevational view being a mirror image thereof; and,
FIG. 4 is a perspective view.
The broken lines are for illustrative purposes only and form no part of the claimed design.