The ornamental design for a fireextinguishercabinet, as shown and described.
FIG. 1 is a perspective view of a fire extinguisher cabinet showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof; the left side elevational view is a mirror image of the right side; and,
FIG. 4 is a top side plan view thereof, the bottom side plan view is a mirror image of the top side.
The back side of the fire extinguisher cabinet is unornamented.
The broken line showing of the fire extinguisher cabinet is included for the purpose of illustrating portions of the cabinet and forms no part of the claimed design.