diff --git a/xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp b/xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp
--- a/xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp
+++ b/xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp
@@ -628,20 +628,17 @@ IndexOfDirectoryOfFile(nsISupportsArray*
         aSearchPath->Count(&count);
         NS_ASSERTION(count, "broken search path! bad count");
         for(PRUint32 i = 0; i < count; i++)
         {
             nsCOMPtr<nsIFile> current;
             aSearchPath->QueryElementAt(i, NS_GET_IID(nsIFile), 
                                         getter_AddRefs(current));
             NS_ASSERTION(current, "broken search path! bad element");
-            // nsIFile::Equals basically compares path strings so normalize
-            // before the comparison.
-            parent->Normalize();
-            current->Normalize();
+
             PRBool same;
             if (NS_SUCCEEDED(parent->Equals(current, &same)) && same)
                 return (int) i;
         }
     }
     NS_ERROR("file not in search directory!");
     return -1;
 }