Fire-fighting foam composition with microfibrous cellulose

A method of fighting a fire, the method comprising:

• forming a foam comprising an aqueous firefighting composition;
• and
• applying the foam directly or indirectly to the fire;
• wherein the aqueous fire-fighting composition comprises:
• a sugar component;
• a polysaccharide thickener;
• a surfactant component comprising an anionic surfactant, a zwitterionic surfactant, a nonionic surfactant, or a mixture of any two or more thereof;
• a suspension agent comprising microfibrous cellulose;
• and
• at least about 30 wt. % water;
• wherein:
• one or more components of the aqueous fire-fighting composition is at least partially insoluble in the aqueous fire-fighting composition.