diff --git a/chrome.manifest b/chrome.manifest
index 5cfdcf8d..058e7444 100644
--- a/chrome.manifest
+++ b/chrome.manifest
@@ -8,5 +8,6 @@ locale treestyletab en-US jar:chrome/treestyletab.jar!/locale/en-US/treestyletab
locale treestyletab ja jar:chrome/treestyletab.jar!/locale/ja/treestyletab/
locale treestyletab it-IT jar:chrome/treestyletab.jar!/locale/it-IT/treestyletab/
locale treestyletab zh-CN jar:chrome/treestyletab.jar!/locale/zh-CN/treestyletab/
+locale treestyletab es-ES jar:chrome/treestyletab.jar!/locale/es-ES/treestyletab/
skin treestyletab classic/1.0 jar:chrome/treestyletab.jar!/skin/classic/treestyletab/
diff --git a/install.rdf b/install.rdf
index 741b1040..bf547b63 100644
--- a/install.rdf
+++ b/install.rdf
@@ -13,6 +13,7 @@
em:optionsURL="chrome://treestyletab/content/config.xul">
Godai71.Extenzilla (it-IT locale)
Fatiaomao (zh-CN locale)
+ tito (es-ES locale)
http://piro.sakura.ne.jp/xul/update.rdf
@@ -43,6 +44,12 @@
em:description="以树的形式显示标签。"
em:homepageURL="http://piro.sakura.ne.jp/xul/_treestyletab.html.en"/>
+
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diff --git a/locale/es-ES/treestyletab/license.txt b/locale/es-ES/treestyletab/license.txt
new file mode 100644
index 00000000..b50fc4ad
--- /dev/null
+++ b/locale/es-ES/treestyletab/license.txt
@@ -0,0 +1,34 @@
+***** BEGIN LICENSE BLOCK *****
+Version: MPL 1.1/GPL 2.0/LGPL 2.1
+
+The contents of this file are subject to the Mozilla Public License Version
+1.1 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+http://www.mozilla.org/MPL/
+
+Software distributed under the License is distributed on an "AS IS" basis,
+WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+for the specific language governing rights and limitations under the
+License.
+
+The Original Code is the Tree Style Tab.
+
+The Initial Developer of the Original Code is SHIMODA Hiroshi.
+Portions created by the Initial Developer are Copyright (C) 2008
+the Initial Developer. All Rights Reserved.
+
+Contributor(s): tito
+
+Alternatively, the contents of this file may be used under the terms of
+either the GNU General Public License Version 2 or later (the "GPL"), or
+the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+in which case the provisions of the GPL or the LGPL are applicable instead
+of those above. If you wish to allow use of your version of this file only
+under the terms of either the GPL or the LGPL, and not to allow others to
+use your version of this file under the terms of the MPL, indicate your
+decision by deleting the provisions above and replace them with the notice
+and other provisions required by the GPL or the LGPL. If you do not delete
+the provisions above, a recipient may use your version of this file under
+the terms of any one of the MPL, the GPL or the LGPL.
+
+***** END LICENSE BLOCK *****
diff --git a/locale/es-ES/treestyletab/treestyletab.dtd b/locale/es-ES/treestyletab/treestyletab.dtd
new file mode 100644
index 00000000..30d1d99b
--- /dev/null
+++ b/locale/es-ES/treestyletab/treestyletab.dtd
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diff --git a/locale/es-ES/treestyletab/treestyletab.properties b/locale/es-ES/treestyletab/treestyletab.properties
new file mode 100644
index 00000000..092af1ec
--- /dev/null
+++ b/locale/es-ES/treestyletab/treestyletab.properties
@@ -0,0 +1,7 @@
+extensions.treestyletab@piro.sakura.ne.jp.name=Tree Style Tab (Pestañas estilo árbol)
+extensions.treestyletab@piro.sakura.ne.jp.description=Muesta las pestañas en vista de árbol
+
+tooltip.collapseSubtree=Colapsar árbol
+tooltip.collapseSubtree.labeled=Colapsar árbol ( %S )
+tooltip.expandSubtree=Expandir árbol
+tooltip.expandSubtree.labeled=Expandir árbol ( %S )