''[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1362528. Please follow up there, thanks.]'' Using the Privacy and Security permissions, and in the "Settings Camera Permissions" it appears to me that I'm only allowed to remove permissions, not add them. The box contains the list of websites that have asked for permission to use my camera. The box is empty. I tried putting the desired website in the the box, thinking I might add it, then tried alternatively both "enter" and "save", and nothing was added to the box below. The box remained empty.