Frigidaire has a service bulletin but your model isn't listed. It says to lubricate the cables with unscented bar soap. Candle wax works too. Here's the bulletin:
Electrolux Major Appliances Service Flash DW0803 Rev. B 03.26.08
FDB4315LF, FDBB4365F, LEDB500FE, GLD4355RF, PLD4375RF, PLD4555RF
Opening or closing the door makes a loud squeaking, vibrating type noise from the door
spring or cable.
The noise is caused by tension on the nylon cable from the spring, as it moves around the
Check the cables for any grease or oil, if the cables have been lubricated replace the cable
and friction pulley it rides around. This may require replacing the cable and pulley on both
sides. After checking or replacing these parts take a bar of regular unscented soap and
liberally rub both of the cable and the door spring on both sides. Then open and close the
door 4 or 5 times to work the soap into the cable and pulley to complete repair.