Using a camera or microphone is not a basic function of a Web Browser* ^more-detail _{<-- Blue text: clickable link)} such as Firefox.

Obviously some uses of the Firefox browser with addons may require camera or microphone use such as Skype or FlashPlayer, the camera and microphone settings are then within those applications or the Operating System * (Such as Windows or Android)

• FlashPlayer: Right click the player to get settings from the context options
  • see https://www.macromedia.com/support/documentation/en/flashplayer/help/help03.html
• Skype How do I change my Skype settings?

I should also have added that there are permissions options for every webpage that you open in a tab

• Firefox Page Info window_use-the-camera
  You have the option to see and set those permissions.

You can inspect cookies and passwords and permissions for the domain in the currently selected tab via these steps:

• click the "Site Identity Button" (Control Center 'i' button) at the left end of the location/address bar
• click the arrow to expand the security message
• click "More Information" to open "Tools -> Page Info"
• click "Permissions" to inspect and modify permissions
• click "Security" to inspect and modify cookies and passwords in a standalone window

• click "View Cookies" in "Tools -> Page Info -> Security" to inspect the cookies from the domain in the currently selected tab
• click "View Saved Passwords" in "Tools -> Page Info -> Security" to inspect the passwords from the domain in the currently selected tab