The ornamental design for a firearm accessory mount, as shown and described.
FIG. 1 is an isometric view of a firearm accessory mount in accordance with the present disclosure;
FIG. 2 is a further isometric view of the firearm accessory mount of FIG. 1;
FIG. 3 is a right side elevation view of the firearm accessory mount of FIG. 1;
FIG. 4 is a left side elevation view of the firearm accessory mount of FIG. 1;
FIG. 5 is a top view of the firearm accessory mount of FIG. 1;
FIG. 6 is a bottom view of the firearm accessory mount of FIG. 1;
FIG. 7 is a rear elevation view of the firearm accessory mount of FIG. 1; and,
FIG. 8 is a front elevation view of the firearm accessory mount of FIG. 1.
The broken lines and planes adjacent to the right side shaded plane and the solid lines depict portions of the firearm accessory mount that form no part of the claimed design.