Previous leaks have suggested that governments including the US have likely tapped into webcams as a way of gathering information on citizens.
Mr Comey said that all government offices cover up the cameras and that normal citizens should be doing the same.
Though the webcams on laptops might be useful, they’re also one of the most valuable things a hacker can get access to.
Once they do so, they can easily watch and record things that go on around them – and that information can be used later for blackmail, breaking into other security systems, or worse.
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The FBI has advised everyone to cover up their computers’ webcams to stop them being spied on.
Leaving webcams open means that hackers can break into them and watch everything that users are doing, security experts have claimed.
“There’s some sensible things you should be doing, and that’s one of them,” Comey said regarding webcam covers.
“You go into any government office and we all have the little camera things that sit on top of the screen.