I think these things were filled with hydrogen peroxide.
They would release jets of gas to alter the positioning of the satellite. It was not really a rocket burn.
Well, I think the most common monopropellant nowadays is hydrazine instead of hydrogen peroxide, and that is a lot more toxic.
“I think these things were filled with hydrogen peroxide...” [Buckeye McFrog]
As rocket propellant, hydrogen peroxide went out decades ago. It wouldn’t store too well in systems meant to stay on orbit for 15 years or more. And it’s not terribly energetic: causes less change in velocity per pound of propellant.
On-orbit maneuvering thrusters have used a hypergolic combination: some formulation of hydrazine as fuel, and nitrogen tetroxide as oxidizer. “Hypergolic” means they ignite on contact with each other - reduces weight & complexity, as igniter subsystems aren’t needed.
Some maneuvering systems have used hydrazine-based monopropellants: fuel and oxidizer mixed as one liquid. These do need an igniter to get them going.
More recently, ion propulsion systems have been used. Available thrust isn’t very high, but they are extremely efficient in fuel consumption.