Extinguisher foam was a fire-fighting measure installed aboard many ships. It could be activated and deactivated from the ship's central control interface and was generally monitored by the ship's computer. Extinguisher foam was also an option for astromech droids.
R2-D2 used extinguisher foam aboard a crashing drone barge to cushion the impact, protecting himself, C-3PO, Luke Skywalker, and Tanith Shire.
In 1 ABY, a group of Rebels, consisting of Skywalker, Leia Organa, Paxin, Falud, R2-D2 and C-3PO used extinguisher foam to subdue a number of Blackhole troopers aboard a Hrakian ship.
R2-D2 used extinguisher foam aboard a crashing drone barge to cushion the impact, protecting himself, C-3PO, Luke Skywalker, and Tanith Shire.
In 1 ABY, a group of Rebels, consisting of Skywalker, Leia Organa, Paxin, Falud, R2-D2 and C-3PO used extinguisher foam to subdue a number of Blackhole troopers aboard a Hrakian ship.