The ornamental design for an adjustable tshapehairsalon chair footrest, as shown and described.
FIG. 1 is 3D perspective view from the front right of a configuration of an adjustable T shape hair salon chair footrest of present invention; and,
FIG. 2 is a 3D exploded perspective view from the front right of a configuration of an adjustable T shape hair salon chair footrest of present invention.