HMS Firebrand was the mercantile schooner Lord Lennox, a French prize taken in 1799 and renamed.

[3] The Royal Navy purchased her in 1804 for use as a fire ship but sold her in 1807.

[2] Disposal: The "Principal Officers and Commissioners of His Majesty's Navy" offered Firebrand and several other vessels for sale on 17 March 1807 at Sheerness.

Lord Lennox re-entered Lloyd's Register in 1808 with Whiteside, master, Hedgecock, owner, and trade London–Cadiz.

[4] She then traded between London and Lisbon and was last listed in the Register of Shipping in 1815.