"Just to compare, we ordered one with salt and one without."
Massaad then used a thermometer to test the temperature of the two chips, with the one with salt 24.3C and the one without 36.9C.
Then all you had to do was "put your own salt" on the chips and enjoy, Massaad said.
His video got dozens of comments from people praising the "clever" hack or admitting that they already did this.
"I used to do this and I was so cocky with it that I would ask them for salt sachets after they gave me my food," one commented.
"I add Saxa Chicken salt to mine. Freshly cooked fries are always better," another added.
But not everyone agreed, with some arguing it created unnecessary work for McDonald's employees and meant a longer wait.
"This makes their job 10 times harder especially in busy periods, just ask for fresh fries," one person said.
"Yeah, but you also have to wait like 10 mins for some chips soooooo," another commented.