The ornamental design for a pull tab of a slider for a slide fastener, as shown and described.
FIG. 1 is a front elevational view of a pull tab of a slider for a slide fastener of the claimed design, the broken lines forming no part of the claimed design;
FIG. 2 is a back elevational view of the pull tab of FIG. 1, the broken lines forming no part of the claimed design;
FIG. 3 is a top view of the pull tab of FIG. 1, the broken lines forming no part of the claimed design;
FIG. 4 is a bottom view of the pull tab of FIG. 1; and,
FIG. 5 is a right-side view of the pull tab of FIG. 1, the left-side view is symmetrical to the right-side view and the broken lines forming no part of the claimed design.