diff --git a/mozilla/modules/plugin/base/src/ns4xPluginInstance.cpp b/mozilla/modules/plugin/base/src/ns4xPluginInstance.cpp
index abdd9c18708..10883910cb2 100644
--- a/mozilla/modules/plugin/base/src/ns4xPluginInstance.cpp
+++ b/mozilla/modules/plugin/base/src/ns4xPluginInstance.cpp
@@ -65,6 +65,7 @@ public:
 
   ns4xPluginStreamListener(nsIPluginInstance* inst, void* notifyData);
   virtual ~ns4xPluginStreamListener(void);
+  PRBool IsStarted(void);
 
 protected:
 
@@ -200,13 +201,19 @@ ns4xPluginStreamListener::OnDataAvailable(nsIPluginStreamInfo* pluginInfo,
       // relies on routine descriptors, not present in carbon. 
       // We need to fix this.
 
-      PRLibrary* lib = nsnull;
-      if(mInst)
-        lib = mInst->fLibrary;
+    PRLibrary* lib = nsnull;
+    PRBool started = PR_FALSE;
+    if(mInst) {
+      lib = mInst->fLibrary;
+      started = mInst->IsStarted();
+    }
 
+    if (started)
+    {
       NS_TRY_SAFE_CALL_RETURN(numtowrite, CallNPP_WriteReadyProc(callbacks->writeready,
                                               npp,
                                               &mNPStream), lib);
+    }
 #endif
 		    
       // if WriteReady returned 0, the plugin is not ready to handle 
@@ -271,13 +278,19 @@ ns4xPluginStreamListener::OnFileAvailable(nsIPluginStreamInfo* pluginInfo,
     // We need to fix this.
 
     PRLibrary* lib = nsnull;
-    if(mInst)
+    PRBool started = PR_FALSE;
+    if(mInst) {
       lib = mInst->fLibrary;
+      started = mInst->IsStarted();
+    }
 
-    NS_TRY_SAFE_CALL_VOID(CallNPP_StreamAsFileProc(callbacks->asfile,
+    if (started)
+    {
+      NS_TRY_SAFE_CALL_VOID(CallNPP_StreamAsFileProc(callbacks->asfile,
                              npp,
                              &mNPStream,
                              fileName), lib);
+    }
 #endif
  
     return NS_OK;
@@ -379,6 +392,11 @@ ns4xPluginInstance :: ~ns4xPluginInstance(void)
 #endif
 }
 
+PRBool
+ns4xPluginInstance :: IsStarted(void)
+{
+    return mStarted;
+}
 
 ////////////////////////////////////////////////////////////////////////
 
diff --git a/mozilla/modules/plugin/base/src/ns4xPluginInstance.h b/mozilla/modules/plugin/base/src/ns4xPluginInstance.h
index 4bb183f789d..96ecddb706f 100644
--- a/mozilla/modules/plugin/base/src/ns4xPluginInstance.h
+++ b/mozilla/modules/plugin/base/src/ns4xPluginInstance.h
@@ -105,6 +105,9 @@ public:
     // Use Release() to destroy this
     virtual ~ns4xPluginInstance(void);
 
+    // returns the state of mStarted
+    PRBool IsStarted(void);
+
 protected:
 
     nsresult InitializePlugin(nsIPluginInstancePeer* peer);
diff --git a/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.cpp b/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.cpp
index abdd9c18708..10883910cb2 100644
--- a/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.cpp
+++ b/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.cpp
@@ -65,6 +65,7 @@ public:
 
   ns4xPluginStreamListener(nsIPluginInstance* inst, void* notifyData);
   virtual ~ns4xPluginStreamListener(void);
+  PRBool IsStarted(void);
 
 protected:
 
@@ -200,13 +201,19 @@ ns4xPluginStreamListener::OnDataAvailable(nsIPluginStreamInfo* pluginInfo,
       // relies on routine descriptors, not present in carbon. 
       // We need to fix this.
 
-      PRLibrary* lib = nsnull;
-      if(mInst)
-        lib = mInst->fLibrary;
+    PRLibrary* lib = nsnull;
+    PRBool started = PR_FALSE;
+    if(mInst) {
+      lib = mInst->fLibrary;
+      started = mInst->IsStarted();
+    }
 
+    if (started)
+    {
       NS_TRY_SAFE_CALL_RETURN(numtowrite, CallNPP_WriteReadyProc(callbacks->writeready,
                                               npp,
                                               &mNPStream), lib);
+    }
 #endif
 		    
       // if WriteReady returned 0, the plugin is not ready to handle 
@@ -271,13 +278,19 @@ ns4xPluginStreamListener::OnFileAvailable(nsIPluginStreamInfo* pluginInfo,
     // We need to fix this.
 
     PRLibrary* lib = nsnull;
-    if(mInst)
+    PRBool started = PR_FALSE;
+    if(mInst) {
       lib = mInst->fLibrary;
+      started = mInst->IsStarted();
+    }
 
-    NS_TRY_SAFE_CALL_VOID(CallNPP_StreamAsFileProc(callbacks->asfile,
+    if (started)
+    {
+      NS_TRY_SAFE_CALL_VOID(CallNPP_StreamAsFileProc(callbacks->asfile,
                              npp,
                              &mNPStream,
                              fileName), lib);
+    }
 #endif
  
     return NS_OK;
@@ -379,6 +392,11 @@ ns4xPluginInstance :: ~ns4xPluginInstance(void)
 #endif
 }
 
+PRBool
+ns4xPluginInstance :: IsStarted(void)
+{
+    return mStarted;
+}
 
 ////////////////////////////////////////////////////////////////////////
 
diff --git a/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.h b/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.h
index 4bb183f789d..96ecddb706f 100644
--- a/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.h
+++ b/mozilla/modules/plugin/nglsrc/ns4xPluginInstance.h
@@ -105,6 +105,9 @@ public:
     // Use Release() to destroy this
     virtual ~ns4xPluginInstance(void);
 
+    // returns the state of mStarted
+    PRBool IsStarted(void);
+
 protected:
 
     nsresult InitializePlugin(nsIPluginInstancePeer* peer);