diff --git a/extensions/webservices/public/nsIWSDLLoader.idl b/extensions/webservices/public/nsIWSDLLoader.idl
index 2971b26fde8d..158f686ed2eb 100644
--- a/extensions/webservices/public/nsIWSDLLoader.idl
+++ b/extensions/webservices/public/nsIWSDLLoader.idl
@@ -61,5 +61,6 @@ interface nsIWSDLLoadListener : nsISupports
 #define NS_ERROR_WSDL_UNKNOWN_SCHEMA_COMPONENT  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 4)
 #define NS_ERROR_WSDL_UNKNOWN_WSDL_COMPONENT    NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 5)
 #define NS_ERROR_WSDL_LOADING_ERROR             NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 6)
-#define NS_ERROR_WSDL_NOT_ENABLED               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 7)
+#define NS_ERROR_WSDL_RECURSIVE_IMPORT          NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 7)
+#define NS_ERROR_WSDL_NOT_ENABLED               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 8)
 %}
diff --git a/extensions/webservices/wsdl/src/nsWSDLLoader.cpp b/extensions/webservices/wsdl/src/nsWSDLLoader.cpp
index 1d5a67b16c52..60328649db9a 100644
--- a/extensions/webservices/wsdl/src/nsWSDLLoader.cpp
+++ b/extensions/webservices/wsdl/src/nsWSDLLoader.cpp
@@ -834,6 +834,23 @@ nsWSDLLoadRequest::ProcessImportElement(nsIDOMElement* aElement,
     return rv;
   }
 
+  // Fix ( bug 202478 ) a potential stack overflow by 
+  // preventing the wsdl file from loading if it was  
+  // already loaded via the import element.
+  PRUint32 count = mImportList.Count();
+  PRUint32 i;
+  for (i = 0; i < count; i++) {
+    PRBool equal;  
+    mImportList[i]->Equals(uri, &equal);
+    if (equal) {
+      // Looks like this uri has already been loaded.
+      // Loading it again will end up in an infinite loop.
+      return NS_ERROR_WSDL_RECURSIVE_IMPORT;
+    }
+  }
+
+  mImportList.AppendObject(uri);
+  
   nsCAutoString spec;
   uri->GetSpec(spec);
 
diff --git a/extensions/webservices/wsdl/src/nsWSDLLoader.h b/extensions/webservices/wsdl/src/nsWSDLLoader.h
index d61b2580c9aa..00961e5d8df6 100644
--- a/extensions/webservices/wsdl/src/nsWSDLLoader.h
+++ b/extensions/webservices/wsdl/src/nsWSDLLoader.h
@@ -204,10 +204,11 @@ protected:
   nsCOMPtr<nsIWSDLLoadListener> mListener;
   nsCOMPtr<nsIXMLHttpRequest> mRequest;
   nsCOMPtr<nsISchemaLoader> mSchemaLoader;
-
+  nsCOMPtr<nsIWSDLPort> mPort;
+  nsCOMArray<nsIURI> mImportList;
+  
   PRPackedBool mIsSync;
 
-  nsCOMPtr<nsIWSDLPort> mPort;
   nsString mPortName;
   nsString mBindingName;
   nsString mBindingNamespace;
diff --git a/extensions/xmlextras/wsdl/public/nsIWSDLLoader.idl b/extensions/xmlextras/wsdl/public/nsIWSDLLoader.idl
index 2971b26fde8d..158f686ed2eb 100644
--- a/extensions/xmlextras/wsdl/public/nsIWSDLLoader.idl
+++ b/extensions/xmlextras/wsdl/public/nsIWSDLLoader.idl
@@ -61,5 +61,6 @@ interface nsIWSDLLoadListener : nsISupports
 #define NS_ERROR_WSDL_UNKNOWN_SCHEMA_COMPONENT  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 4)
 #define NS_ERROR_WSDL_UNKNOWN_WSDL_COMPONENT    NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 5)
 #define NS_ERROR_WSDL_LOADING_ERROR             NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 6)
-#define NS_ERROR_WSDL_NOT_ENABLED               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 7)
+#define NS_ERROR_WSDL_RECURSIVE_IMPORT          NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 7)
+#define NS_ERROR_WSDL_NOT_ENABLED               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 8)
 %}
diff --git a/extensions/xmlextras/wsdl/src/nsWSDLLoader.cpp b/extensions/xmlextras/wsdl/src/nsWSDLLoader.cpp
index 1d5a67b16c52..60328649db9a 100644
--- a/extensions/xmlextras/wsdl/src/nsWSDLLoader.cpp
+++ b/extensions/xmlextras/wsdl/src/nsWSDLLoader.cpp
@@ -834,6 +834,23 @@ nsWSDLLoadRequest::ProcessImportElement(nsIDOMElement* aElement,
     return rv;
   }
 
+  // Fix ( bug 202478 ) a potential stack overflow by 
+  // preventing the wsdl file from loading if it was  
+  // already loaded via the import element.
+  PRUint32 count = mImportList.Count();
+  PRUint32 i;
+  for (i = 0; i < count; i++) {
+    PRBool equal;  
+    mImportList[i]->Equals(uri, &equal);
+    if (equal) {
+      // Looks like this uri has already been loaded.
+      // Loading it again will end up in an infinite loop.
+      return NS_ERROR_WSDL_RECURSIVE_IMPORT;
+    }
+  }
+
+  mImportList.AppendObject(uri);
+  
   nsCAutoString spec;
   uri->GetSpec(spec);
 
diff --git a/extensions/xmlextras/wsdl/src/nsWSDLLoader.h b/extensions/xmlextras/wsdl/src/nsWSDLLoader.h
index d61b2580c9aa..00961e5d8df6 100644
--- a/extensions/xmlextras/wsdl/src/nsWSDLLoader.h
+++ b/extensions/xmlextras/wsdl/src/nsWSDLLoader.h
@@ -204,10 +204,11 @@ protected:
   nsCOMPtr<nsIWSDLLoadListener> mListener;
   nsCOMPtr<nsIXMLHttpRequest> mRequest;
   nsCOMPtr<nsISchemaLoader> mSchemaLoader;
-
+  nsCOMPtr<nsIWSDLPort> mPort;
+  nsCOMArray<nsIURI> mImportList;
+  
   PRPackedBool mIsSync;
 
-  nsCOMPtr<nsIWSDLPort> mPort;
   nsString mPortName;
   nsString mBindingName;
   nsString mBindingNamespace;