2012 and newer models are required to have traction control and stability control by US regulations. If you push the button once, it turns traction control off. Traction control only works when first pulling out.
Stability control is still turned on and will not allow the car to be drifted. To disable both systems, you must push and hold the button for 3 seconds and it will turn off both systems and the drift away! I don't see them developing a different way the system operates so this should be true for the FR-S as well. They did develop a less intrusive mode which is the VSC Sport mode and that has it's own button to turn on/off.
Ruskymx