Anyone know if it is safe to use a CFL in the fridge?

I tried at 9w one out and it seems to work fine.

I do not think it will save me much money in lighting costs, however
the heat from a normal bulb is significant and I was thinking not
having a bulb heating the fridge every time it is open might make it
advantageous.

I am however worried that the bulb (mercury) might cause problems with
food.

Anyone able to provide insight?