"Just beware that putting something over your camera lens isn’t a complete solution, according to Marshall Erwin, head of trust and privacy at Mozilla, which makes the Firefox browser.
“When you use a webcam cover, you do block the camera lens, but it can also cover the indicator light, which means you can’t see when the camera and more importantly the microphone is activated,” he says. “This means hackers can still be listening in, even if the camera is blocked.”"