From 379602699558abc754d4a80b8b2555c878c284f6 Mon Sep 17 00:00:00 2001
From: YUKI Hiroshi <shimoda@clear-code.com>
Date: Tue, 5 Jul 2016 14:54:18 +0900
Subject: [PATCH] Override SessionStoreInternal's method instead of proxy's one

---
 modules/utils.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/modules/utils.js b/modules/utils.js
index ec5f8294..af093c60 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -800,9 +800,9 @@ prefs.addPrefListener(TreeStyleTabUtils);
 		});
 	}
 
-	let { SessionStore } = Cu.import('resource:///modules/sessionstore/SessionStore.jsm', {});
-	SessionStore.__treestyletab__duplicateTab = SessionStore.duplicateTab;
-	SessionStore.duplicateTab = function(aWindow, aTab, aDelta = 0) {
+	let { SessionStoreInternal } = Cu.import('resource:///modules/sessionstore/SessionStore.jsm', {});
+	SessionStoreInternal.__treestyletab__duplicateTab = SessionStoreInternal.duplicateTab;
+	SessionStoreInternal.duplicateTab = function(aWindow, aTab, aDelta = 0) {
 		aWindow.gBrowser.treeStyleTab.onBeforeTabDuplicate(aWindow, aTab, aDelta);
 		return this.__treestyletab__duplicateTab.call(this, aWindow, aTab, aDelta);
 	};