diff --git a/xpcom/components/nsCategoryManager.cpp b/xpcom/components/nsCategoryManager.cpp
index c62b5319c51..dc703564ade 100644
--- a/xpcom/components/nsCategoryManager.cpp
+++ b/xpcom/components/nsCategoryManager.cpp
@@ -42,7 +42,6 @@
 #include "nsCOMPtr.h"
 #include "nsHashtable.h"
 #include "nsIFactory.h"
-#include "nsIRegistry.h"
 #include "nsSupportsPrimitives.h"
 #include "nsIObserver.h"
 #include "nsComponentManager.h"
@@ -62,6 +61,9 @@
     Leaf nodes are strings.
   */
 
+// this function is not public yet, hence it is externed here.
+extern nsresult NS_GetComponentLoaderManager(nsIComponentLoaderManager* *result);
+
 
 static
 NS_IMETHODIMP
@@ -270,8 +272,6 @@ nsCategoryManager::AddCategoryEntry( const char *aCategoryName,
         nsCStringKey entryNameKey(aEntryName);
         category->Put(&entryNameKey, entry);
 
-        // this function is not public yet, hence it is externed here.
-        extern nsresult NS_GetComponentLoaderManager(nsIComponentLoaderManager* *result);
         nsCOMPtr<nsIComponentLoaderManager> mgr;
         NS_GetComponentLoaderManager(getter_AddRefs(mgr));
         if (mgr)
@@ -303,6 +303,12 @@ nsCategoryManager::DeleteCategoryEntry( const char *aCategoryName,
       {
         nsCStringKey entryKey(aEntryName);
         category->RemoveAndDelete(&entryKey);
+
+        nsCOMPtr<nsIComponentLoaderManager> mgr;
+        NS_GetComponentLoaderManager(getter_AddRefs(mgr));
+        if (mgr)
+          mgr->FlushPersistentStore(PR_FALSE);
+
       }
 
     return NS_OK;
@@ -315,6 +321,11 @@ nsCategoryManager::DeleteCategory( const char *aCategoryName )
   {
     NS_ASSERTION(aCategoryName, "aCategoryName is NULL!");
 
+    nsCOMPtr<nsIComponentLoaderManager> mgr;
+    NS_GetComponentLoaderManager(getter_AddRefs(mgr));
+    if (mgr)
+      mgr->FlushPersistentStore(PR_FALSE);
+
       // QUESTION: consider whether this should be an error
     nsCStringKey categoryKey(aCategoryName);
     return RemoveAndDelete(&categoryKey) ? NS_OK : NS_ERROR_NOT_AVAILABLE;