When do you turn them on or off ?
Additional System Details
- User Agent: Mozilla/5.0 (Android 8.1.0; Mobile; rv:68.0) Gecko/68.0 Firefox/68.0
That depends on what O/S your using? If Windows 10 those options must be turned off from the O/S settings. The O/S controls what apps can use the mic/camera.
You posted with using Firefox on a mobile device (Android). If your question about Firefox on mobile or about Firefox on desktop?
For desktop, see "Tools -> Page Info -> Permissions".