--- a/dom/plugins/base/nsPluginHost.cpp
+++ b/dom/plugins/base/nsPluginHost.cpp
@@ -1062,17 +1062,16 @@ nsPluginHost::InstantiateEmbeddedPlugin(
   nsRefPtr<nsNPAPIPluginInstance> instance;
   rv = aOwner->GetInstance(getter_AddRefs(instance));
   // if we have a failure error, it means we found a plugin for the mimetype,
   // but we had a problem with the entry point
   if (rv == NS_ERROR_FAILURE)
     return rv;
 
   if (instance) {
-    instance->Start();
     aOwner->CreateWidget();
 
     // If we've got a native window, the let the plugin know about it.
     aOwner->SetWindow();
 
     // create an initial stream with data
     // don't make the stream if it's a java applet or we don't have SRC or DATA attribute
     PRBool havedata = PR_FALSE;
@@ -1121,17 +1120,16 @@ nsresult nsPluginHost::InstantiateFullPa
   if (NS_OK == rv) {
     nsRefPtr<nsNPAPIPluginInstance> instance;
     aOwner->GetInstance(getter_AddRefs(instance));
 
     NPWindow* win = nsnull;
     aOwner->GetWindow(win);
 
     if (win && instance) {
-      instance->Start();
       aOwner->CreateWidget();
 
       // If we've got a native window, the let the plugin know about it.
       aOwner->SetWindow();
 
       rv = NewFullPagePluginStream(aURI, instance.get(), aStreamListener);
 
       // If we've got a native window, the let the plugin know about it.

--- a/dom/plugins/base/nsPluginStreamListenerPeer.cpp
+++ b/dom/plugins/base/nsPluginStreamListenerPeer.cpp
@@ -653,17 +653,16 @@ nsPluginStreamListenerPeer::OnStartReque
     mOwner->GetWindow(window);
     if (!mPluginInstance && window) {
       nsRefPtr<nsPluginHost> pluginHost = dont_AddRef(nsPluginHost::GetInst());
       rv = pluginHost->SetUpPluginInstance(aContentType.get(), aURL, mOwner);
       if (NS_SUCCEEDED(rv)) {
         mOwner->GetInstance(getter_AddRefs(pluginInstRefPtr));
         mPluginInstance = pluginInstRefPtr.get();
         if (mPluginInstance) {
-          mPluginInstance->Start();
           mOwner->CreateWidget();
           // If we've got a native window, the let the plugin know about it.
           mOwner->SetWindow();
         }
       }
     }
   }