This is automatic in Firefox. When giving e.g. microphone permission, you can leave the 'Remember this desxision' option unchecked. This will make the permissio

This is automatic in Firefox. When giving e.g. microphone permission, you can leave the 'Remember this desxision' option unchecked. This will make the permission 'Allowed temporarily' and will be reset when you close the tab or window. As far as I can test, Chrome does not have this option.