Fire-Detecting Microwave

Even when a microwave is shielded, some light can escapes. I assume some of this light is in the IR range, though if not my idea still works, albeit poorly. Anyhow, I envision a simple IR camera inside the microwave detecting the heat of the food. I'm sure this camera has benefits beyond my suggestion.

Anyhow, if the camera detects sudden localized increases in temperature, it interprets that as fire and shuts off the microwave.

I figure, it's only a matter of time before someone installs *nix on his microwave. And since there's already support (well, there used to be) for detecting if a printer is on fire...