They sell insulation kits at the local big box hardware store and I cringe every time I see them. The box weighs about 15 pounds, which doesn't sound like a lot. It is definitely enough to un-balance a garage door. The springs are calibrated for the weight of the door, and adding weight makes the door "heavy" for the springs. This means that if you pull an operator disconnect handle when the door is in the open position, the door is likely to descend much more quickly than you anticipate. People have been hurt when a garage door came down on them and the momentum knocked them over. Only add weight if the door springs can be re-torqued or replaced with springs of the proper pull.
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