diff --git a/netwerk/base/src/nsRequestObserverProxy.cpp b/netwerk/base/src/nsRequestObserverProxy.cpp
index 50bfbba75ac..f73178df724 100644
--- a/netwerk/base/src/nsRequestObserverProxy.cpp
+++ b/netwerk/base/src/nsRequestObserverProxy.cpp
@@ -105,6 +105,7 @@ public:
             return;
         }
 
+        LOG(("handle startevent=%8lX\n",(long)this));
         nsresult rv = mProxy->mObserver->OnStartRequest(mRequest, mContext);
         if (NS_FAILED(rv)) {
             LOG(("OnStartRequest failed [rv=%x] canceling request!\n", rv));
@@ -155,6 +156,7 @@ public:
         rv = mRequest->GetStatus(&status);
         NS_ASSERTION(NS_SUCCEEDED(rv), "GetStatus failed for request!");
 
+        LOG(("handle stopevent=%8lX\n",(long)this));
         (void) observer->OnStopRequest(mRequest, mContext, status);
     }
 };
@@ -182,6 +184,7 @@ nsRequestObserverProxy::OnStartRequest(nsIRequest *request,
     if (!ev)
         return NS_ERROR_OUT_OF_MEMORY;
 
+    LOG(("post startevent=%8lX queue=%8lX\n",(long)ev,(long)mEventQ.get()));
     nsresult rv = FireEvent(ev);
     if (NS_FAILED(rv))
         delete ev;
@@ -206,6 +209,7 @@ nsRequestObserverProxy::OnStopRequest(nsIRequest *request,
     if (!ev)
         return NS_ERROR_OUT_OF_MEMORY;
 
+    LOG(("post stopevent=%8lX queue=%8lX\n",(long)ev,(long)mEventQ.get()));
     nsresult rv = FireEvent(ev);
     if (NS_FAILED(rv))
         delete ev;
diff --git a/netwerk/base/src/nsRequestObserverProxy.h b/netwerk/base/src/nsRequestObserverProxy.h
index 9abe6234568..1a1741cca94 100644
--- a/netwerk/base/src/nsRequestObserverProxy.h
+++ b/netwerk/base/src/nsRequestObserverProxy.h
@@ -45,6 +45,10 @@ public:
     nsIRequestObserver *Observer() { return mObserver; }
 
     nsresult FireEvent(nsARequestObserverEvent *);
+#ifdef DEBUG
+    nsIEventQueue *GetEventQueue()
+               { return mEventQ.get(); } // debugging-only; no addref
+#endif
     nsresult SetEventQueue(nsIEventQueue *);
 
 protected:
diff --git a/netwerk/base/src/nsStreamListenerProxy.cpp b/netwerk/base/src/nsStreamListenerProxy.cpp
index 4acde6ec9e6..612789093ca 100644
--- a/netwerk/base/src/nsStreamListenerProxy.cpp
+++ b/netwerk/base/src/nsStreamListenerProxy.cpp
@@ -167,6 +167,8 @@ nsOnDataAvailableEvent::HandleEvent()
     nsCOMPtr<nsIStreamListener> listener;
     rv = mProxy->GetListener(getter_AddRefs(listener));
 
+    LOG(("handle dataevent=%8lX\n",(long)this));
+
     // Forward call to listener
     if (listener)
         rv = listener->OnDataAvailable(mRequest, mContext,
@@ -324,6 +326,7 @@ nsStreamListenerProxy::OnDataAvailable(nsIRequest *request,
     if (!ev) return NS_ERROR_OUT_OF_MEMORY;
 
     // Reuse the event queue of the observer proxy
+    LOG(("post dataevent=%8lX queue=%8lX\n",(long)ev,(long)mObserverProxy->GetEventQueue()));
     rv = mObserverProxy->FireEvent(ev);
     if (NS_FAILED(rv))
         delete ev;