From 21715d2c3c30cded8c3f91f850749df39bf730ab Mon Sep 17 00:00:00 2001
From: Piro / YUKI Hiroshi <piro.outsider.reflex@gmail.com>
Date: Mon, 14 Dec 2015 23:26:00 +0900
Subject: [PATCH] Don't touch missing "detail" information of TabAttrModified
 event on Firefox 38 #1010

---
 modules/browser.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/browser.js b/modules/browser.js
index 6e17cf7c..ebe9fdb4 100644
--- a/modules/browser.js
+++ b/modules/browser.js
@@ -2906,6 +2906,9 @@ TreeStyleTabBrowser.prototype = inherit(TreeStyleTabWindow.prototype, {
 			case 'TabAttrModified':
 				{
 					let tab = aEvent.originalTarget;
+					// on Fireofx 38 the event has no "detail" information.
+					if (!aEvent.detail)
+						return;
 					aEvent.detail.changed.forEach(function(aAttrName) {
 						switch (aAttrName)
 						{