diff --git a/toolkit/xre/nsXREDirProvider.cpp b/toolkit/xre/nsXREDirProvider.cpp
index 2ac76686d630..d90887964bbd 100644
--- a/toolkit/xre/nsXREDirProvider.cpp
+++ b/toolkit/xre/nsXREDirProvider.cpp
@@ -298,11 +298,7 @@ nsXREDirProvider::GetFile(const char* aProperty, bool* aPersistent,
   rv = NS_ERROR_FAILURE;
   nsCOMPtr<nsIFile> file;
 
-  if (!strcmp(aProperty, NS_APP_PROFILE_DEFAULTS_50_DIR) ||
-           !strcmp(aProperty, NS_APP_PROFILE_DEFAULTS_NLOC_50_DIR)) {
-    return GetProfileDefaultsDir(aFile);
-  }
-  else if (!strcmp(aProperty, NS_APP_PREF_DEFAULTS_50_DIR))
+  if (!strcmp(aProperty, NS_APP_PREF_DEFAULTS_50_DIR))
   {
     // return the GRE default prefs directory here, and the app default prefs
     // directory (if applicable) in NS_APP_PREFS_DEFAULTS_DIR_LIST.
@@ -433,13 +429,11 @@ nsXREDirProvider::GetFile(const char* aProperty, bool* aPersistent,
       }
       else {
         rv = file->AppendNative(NS_LITERAL_CSTRING("localstore.rdf"));
-        EnsureProfileFileExists(file);
         ensureFilePermissions = true;
       }
     }
     else if (!strcmp(aProperty, NS_APP_USER_MIMETYPES_50_FILE)) {
       rv = file->AppendNative(NS_LITERAL_CSTRING("mimeTypes.rdf"));
-      EnsureProfileFileExists(file);
       ensureFilePermissions = true;
     }
     else if (!strcmp(aProperty, NS_APP_DOWNLOADS_50_FILE)) {
@@ -1446,51 +1440,6 @@ nsXREDirProvider::EnsureDirectoryExists(nsIFile* aDirectory)
   return rv;
 }
 
-void
-nsXREDirProvider::EnsureProfileFileExists(nsIFile *aFile)
-{
-  nsresult rv;
-  bool exists;
-
-  rv = aFile->Exists(&exists);
-  if (NS_FAILED(rv) || exists) return;
-
-  nsAutoCString leafName;
-  rv = aFile->GetNativeLeafName(leafName);
-  if (NS_FAILED(rv)) return;
-
-  nsCOMPtr<nsIFile> defaultsFile;
-  rv = GetProfileDefaultsDir(getter_AddRefs(defaultsFile));
-  if (NS_FAILED(rv)) return;
-
-  rv = defaultsFile->AppendNative(leafName);
-  if (NS_FAILED(rv)) return;
-
-  defaultsFile->CopyToNative(mProfileDir, EmptyCString());
-}
-
-nsresult
-nsXREDirProvider::GetProfileDefaultsDir(nsIFile* *aResult)
-{
-  NS_ASSERTION(mGREDir, "nsXREDirProvider not initialized.");
-  NS_PRECONDITION(aResult, "Null out-param");
-
-  nsresult rv;
-  nsCOMPtr<nsIFile> defaultsDir;
-
-  rv = GetAppDir()->Clone(getter_AddRefs(defaultsDir));
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  rv = defaultsDir->AppendNative(NS_LITERAL_CSTRING("defaults"));
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  rv = defaultsDir->AppendNative(NS_LITERAL_CSTRING("profile"));
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  defaultsDir.forget(aResult);
-  return NS_OK;
-}
-
 nsresult
 nsXREDirProvider::AppendSysUserExtensionPath(nsIFile* aFile)
 {
diff --git a/toolkit/xre/nsXREDirProvider.h b/toolkit/xre/nsXREDirProvider.h
index eb27ed27fc26..1190cc708171 100644
--- a/toolkit/xre/nsXREDirProvider.h
+++ b/toolkit/xre/nsXREDirProvider.h
@@ -54,8 +54,6 @@ public:
 
   void DoShutdown();
 
-  nsresult GetProfileDefaultsDir(nsIFile* *aResult);
-
   static nsresult GetUserAppDataDirectory(nsIFile* *aFile) {
     return GetUserDataDirectory(aFile, false, nullptr, nullptr, nullptr);
   }
@@ -108,7 +106,6 @@ protected:
   static nsresult GetSystemExtensionsDirectory(nsIFile** aFile);
 #endif
   static nsresult EnsureDirectoryExists(nsIFile* aDirectory);
-  void EnsureProfileFileExists(nsIFile* aFile);
 
   // Determine the profile path within the UAppData directory. This is different
   // on every major platform.
diff --git a/xpcom/io/nsAppDirectoryServiceDefs.h b/xpcom/io/nsAppDirectoryServiceDefs.h
index 4eb39bdf681f..3242812670f6 100644
--- a/xpcom/io/nsAppDirectoryServiceDefs.h
+++ b/xpcom/io/nsAppDirectoryServiceDefs.h
@@ -31,11 +31,6 @@
 
 #define NS_APP_DEFAULTS_50_DIR                  "DefRt"         // The root dir of all defaults dirs
 #define NS_APP_PREF_DEFAULTS_50_DIR             "PrfDef"
-#define NS_APP_PROFILE_DEFAULTS_50_DIR          "profDef"       // The profile defaults of the "current"
-                                                                // locale. Should be first choice.
-#define NS_APP_PROFILE_DEFAULTS_NLOC_50_DIR     "ProfDefNoLoc"  // The profile defaults of the "default"
-                                                                // installed locale. Second choice
-                                                                // when above is not available.
                                                                                                                        
 #define NS_APP_USER_PROFILES_ROOT_DIR           "DefProfRt"     // The dir where user profile dirs live.
 #define NS_APP_USER_PROFILES_LOCAL_ROOT_DIR     "DefProfLRt"  // The dir where user profile temp dirs live.
diff --git a/xpcom/io/nsAppFileLocationProvider.cpp b/xpcom/io/nsAppFileLocationProvider.cpp
index 1211c39be853..bf01fd366b93 100644
--- a/xpcom/io/nsAppFileLocationProvider.cpp
+++ b/xpcom/io/nsAppFileLocationProvider.cpp
@@ -58,7 +58,6 @@
 
 #define DEFAULTS_DIR_NAME           NS_LITERAL_CSTRING("defaults")
 #define DEFAULTS_PREF_DIR_NAME      NS_LITERAL_CSTRING("pref")
-#define DEFAULTS_PROFILE_DIR_NAME   NS_LITERAL_CSTRING("profile")
 #define RES_DIR_NAME                NS_LITERAL_CSTRING("res")
 #define CHROME_DIR_NAME             NS_LITERAL_CSTRING("chrome")
 #define PLUGINS_DIR_NAME            NS_LITERAL_CSTRING("plugins")
@@ -123,15 +122,6 @@ nsAppFileLocationProvider::GetFile(const char* aProp, bool* aPersistent,
         rv = localFile->AppendRelativeNativePath(DEFAULTS_PREF_DIR_NAME);
       }
     }
-  } else if (nsCRT::strcmp(aProp, NS_APP_PROFILE_DEFAULTS_50_DIR) == 0 ||
-             nsCRT::strcmp(aProp, NS_APP_PROFILE_DEFAULTS_NLOC_50_DIR) == 0) {
-    rv = CloneMozBinDirectory(getter_AddRefs(localFile));
-    if (NS_SUCCEEDED(rv)) {
-      rv = localFile->AppendRelativeNativePath(DEFAULTS_DIR_NAME);
-      if (NS_SUCCEEDED(rv)) {
-        rv = localFile->AppendRelativeNativePath(DEFAULTS_PROFILE_DIR_NAME);
-      }
-    }
   } else if (nsCRT::strcmp(aProp, NS_APP_USER_PROFILES_ROOT_DIR) == 0) {
     rv = GetDefaultUserProfileRoot(getter_AddRefs(localFile));
   } else if (nsCRT::strcmp(aProp, NS_APP_USER_PROFILES_LOCAL_ROOT_DIR) == 0) {