diff --git a/embedding/browser/activex/src/plugin/LegacyPlugin.cpp b/embedding/browser/activex/src/plugin/LegacyPlugin.cpp
index d83847877236..64efedc705a7 100644
--- a/embedding/browser/activex/src/plugin/LegacyPlugin.cpp
+++ b/embedding/browser/activex/src/plugin/LegacyPlugin.cpp
@@ -710,7 +710,8 @@ NewControl(const char *pluginType,
             if (argv[i])
             {
                 nsCOMPtr<nsIDOMElement> element;
-                NPN_GetValue(pData->pPluginInstance, NPNVDOMElement, (void *) &element);
+                NPN_GetValue(pData->pPluginInstance, NPNVDOMElement, 
+                             NS_STATIC_CAST(nsIDOMElement **, getter_AddRefs(element)));
                 if (element)
                 {
                     nsCOMPtr<nsIDOMNode> tagAsNode (do_QueryInterface(element));
diff --git a/embedding/browser/activex/src/plugin/XPCBrowser.cpp b/embedding/browser/activex/src/plugin/XPCBrowser.cpp
index f1c608ee1f81..e42b1eb98e74 100644
--- a/embedding/browser/activex/src/plugin/XPCBrowser.cpp
+++ b/embedding/browser/activex/src/plugin/XPCBrowser.cpp
@@ -64,7 +64,8 @@ HRESULT IEBrowser::Init(PluginInstanceData *pData)
 {
     mData = pData;
     // Get the location URL
-    NPN_GetValue(mData->pPluginInstance, NPNVDOMWindow, (void *) &mDOMWindow);
+    NPN_GetValue(mData->pPluginInstance, NPNVDOMWindow, 
+        NS_STATIC_CAST(nsIDOMWindow **,getter_AddRefs(mDOMWindow)));
     if (mDOMWindow)
     {
         mWebNavigation  = do_GetInterface(mDOMWindow);
diff --git a/embedding/browser/activex/src/plugin/XPCDocument.cpp b/embedding/browser/activex/src/plugin/XPCDocument.cpp
index bf3c579d39ba..e8afc2618022 100644
--- a/embedding/browser/activex/src/plugin/XPCDocument.cpp
+++ b/embedding/browser/activex/src/plugin/XPCDocument.cpp
@@ -743,14 +743,16 @@ public:
         nsCOMPtr<nsIDOMElement> element;
 
         // Get the DOM document
-        NPN_GetValue(mData->pPluginInstance, NPNVDOMElement, (void *) &element);
+        NPN_GetValue(mData->pPluginInstance, NPNVDOMElement, 
+                     NS_STATIC_CAST(nsIDOMElement **, getter_AddRefs(element)));
         if (element)
         {
             element->GetOwnerDocument(getter_AddRefs(mDOMDocument));
         }
 
         // Get the DOM window
-        NPN_GetValue(mData->pPluginInstance, NPNVDOMWindow, (void *) &mDOMWindow);
+        NPN_GetValue(mData->pPluginInstance, NPNVDOMWindow, 
+                     NS_STATIC_CAST(nsIDOMWindow **, getter_AddRefs(mDOMWindow)));
         if (mDOMWindow)
         {
             nsCOMPtr<nsIDOMWindowInternal> windowInternal = do_QueryInterface(mDOMWindow);
diff --git a/embedding/browser/activex/src/plugin/XPConnect.cpp b/embedding/browser/activex/src/plugin/XPConnect.cpp
index 03d3edebbb2c..536848fd9cb5 100644
--- a/embedding/browser/activex/src/plugin/XPConnect.cpp
+++ b/embedding/browser/activex/src/plugin/XPConnect.cpp
@@ -376,7 +376,8 @@ nsScriptablePeer::ConvertVariants(VARIANT *aIn, nsIVariant **aOut)
                 if (pManager)
                 {
                     rv = pManager->CreateInstanceByContractID("@mozilla.org/variant;1",
-                        nsnull, NS_GET_IID(nsIWritableVariant), (void **) &v);
+                        nsnull, NS_GET_IID(nsIWritableVariant),
+                        getter_AddRefs(v));
                     pManager->Release();
                 }
             }
@@ -740,10 +741,11 @@ nsEventSink::InternalInvoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wF
     pFuncDesc = NULL;
 
     nsCOMPtr<nsIDOMElement> element;
-    NPN_GetValue(mPlugin->pPluginInstance, NPNVDOMElement, (void *) &element);
+    NPN_GetValue(mPlugin->pPluginInstance, NPNVDOMElement, 
+        NS_STATIC_CAST(nsIDOMElement **, getter_AddRefs(element)));
     if (!element)
     {
-        NS_ASSERTION(element, "can't get the object element");
+        NS_ERROR("can't get the object element");
         return S_OK;
     }
     nsAutoString id;
@@ -758,7 +760,8 @@ nsEventSink::InternalInvoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wF
 
     // Fire the script event handler...
     nsCOMPtr<nsIDOMWindow> window;
-    NPN_GetValue(mPlugin->pPluginInstance, NPNVDOMWindow, (void *)&window);
+    NPN_GetValue(mPlugin->pPluginInstance, NPNVDOMWindow, 
+        NS_STATIC_CAST(nsIDOMWindow **, getter_AddRefs(window)));
     
     nsCOMPtr<nsIScriptEventManager> eventManager(do_GetInterface(window));
     if (!eventManager) return S_OK;
diff --git a/modules/plugin/base/src/nsPluginHostImpl.cpp b/modules/plugin/base/src/nsPluginHostImpl.cpp
index a6d4cdc9604e..892c248c8cce 100644
--- a/modules/plugin/base/src/nsPluginHostImpl.cpp
+++ b/modules/plugin/base/src/nsPluginHostImpl.cpp
@@ -6590,7 +6590,7 @@ nsPluginByteRangeStreamListener::OnStartRequest(nsIRequest *request, nsISupports
 
   //get nsPluginStreamListenerPeer* ptr from finalStreamListener 
   nsPluginStreamListenerPeer *pslp = NS_REINTERPRET_CAST(nsPluginStreamListenerPeer*,
-                                     *(NS_REINTERPRET_CAST(void**, &finalStreamListener)));
+                                                         finalStreamListener.get());
   rv = pslp->ServeStreamAsFile(request, ctxt);
   return rv;
 }