Thumb support for a mouse

FIG. 1 is a front perspective view of a thumb support for a mouse showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left side perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The even length broken lines depicting the remainder of the mouse in the figures show features that form no part of the claimed design. The uneven length broken lines depict an unclaimed boundary of the design.