Most modern domestic fridges stick with a plain hydrocarbon refrigerant anyway (akin to butane) these days.

I’m yet to see R600a in Australian domestic fridges, I thought we were lagging in that department? Can you just get them at retailers now?

if you’ve got burning refrigerant there are much bigger problems going on seeing as the refrigerant circuit is hermetically sealed

Inhaling burning fluorine compounds > fridge not cooling any more.