Abstract: The invention relates to a fire fighting foam concentrate comprising a first surfactant, the first surfactant having an acid group as well as an oligosilane unit and/or oligosiloxane unit. The invention further relates to a method for extinguishing fires, comprising the steps of: providing a fire fighting foam concentrate; adding the fire fighting foam concentrate to water to obtain a mixture and bringing the fire into contact with the mixture; wherein the fire fighting foam concentrate is a fire fighting foam concentrate according to the invention. A further object of the invention is the use of a surfactant as an additive to fire fighting foams and/or fire fighting foam concentrates, the surfactant comprising an acid group as well as an oligosilane unit and/or oligosiloxane unit.