Glass reacts badly to a quick change in temperature, it is not a good idea to move glass baking dishes such as Pyrex from your fridge to the oven. When you do this, it greatly increases the chance that your glass dish will break in the oven. Rather than moving your cold glass dish directly from the fridge to your oven, it’s a good idea to allow your glass to warm to room temperature before placing it into the oven. Even then, you should put your glass dish into a cold oven and heat your oven with the glass dish inside of it.