Abstract: An accessory for releasably securing to a ladder. The accessory has at least one stabilizing arm for stabilizing and supporting the ladder when leaned against a building or structure. The stabilizing arm has a generally U-shaped configuration with a pair of generally parallel leg members that are spaced apart by a distance approximating the distance between the centers of adjacent ladder rungs. Each of the leg members ends in a ladder rung engaging member having a fore and an aft end, and is receivable within the hollow interior of a ladder rung. The ladder rung engaging members are oriented in a convergent configuration such that inserting them the hollow interiors of a pair of ladder rungs causes the fore and aft ends of the ladder rung engaging members to bind against opposite sides of the interior surfaces of the ladder rungs, and to releasably secure the stabilizing arm to the ladder.