Why is my fridge not cooling after a breaker trip?

Why is my fridge not cooling after a breaker trip? My power breaker in the kitchen tripped... not due to the fridge but due to something else I plugged into the circuit. Around five hours after resetting the breaker I went to get some ice-cream and discovered my fridge apparently didn't actually kick back in. I unplugged it and then plugged it back in and it came back on, however, it is not getting as cold as it previously did!