The ornamental design for a firingdeviceadapter, as shown and described.
FIG. 1 is a front elevational view of a firing device adapter, showing my new design; the top, bottom, and rear elevational views being mirror images thereof;
FIG. 2 is a left end elevational view of the firing device adapter of FIG. 1.
FIG. 3 is a right end elevational view of the firing device adapter of FIG. 1; and,
FIG. 4 is a cross-sectional view as taken on line 4—4 of FIG. 1.