Class type Mozilla.XPCOM.requestObserver

class type requestObserver = object .. end

• Mozilla.XPCOM.supports

method onStartRequest : 'a 'b.
         (#request as 'a) -> (#supports as 'b) -> unit

method onStopRequest : 'c 'd.
         (#request as 'c) ->
         (#supports as 'd) -> int -> unit