I don't actually use a webcam on my laptop. I just wish it was closed for security reasons. They are so tiny and thin that they fit on top of a laptop's webcam without hanging over the edges or interfering with the lid closing. It's pretty loose so it slides easily. I noticed that it opened once after closing and opening my laptop multiple times. Low profile (much better than sticking paper over the camera). The adhesive has held up well for a few months since I've been wearing it. Didn't really use the webcam, but it doesn't look like it interferes with the image.
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