at least under windows where i could test the issue, the new sharing indicator is not getting displayed when alerts.useSystemBackend is enabled (which is a non-default value), so there is no indication that camera/mic/screen-sharing is taking place in firefox.
Bug 1648358 Comment 0 Edit History
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at least under windows where i could test the issue, the new sharing indicator is not getting displayed when alerts.useSystemBackend is enabled (which is a non-default value), and there is no indication in the address bar that camera/mic/screen-sharing is taking place in firefox either.