diff --git a/chrome.manifest b/chrome.manifest
index 2e91a39e..ceed7a4b 100644
--- a/chrome.manifest
+++ b/chrome.manifest
@@ -27,6 +27,7 @@ locale treestyletab pl locale/pl/treestyletab/
locale treestyletab fr-FR locale/fr-FR/treestyletab/
locale treestyletab sv-SE locale/sv-SE/treestyletab/
locale treestyletab da-DK locale/da-DK/treestyletab/
+locale treestyletab cs locale/cs/treestyletab/
skin treestyletab classic/1.0 skin/classic/treestyletab/
diff --git a/install.rdf b/install.rdf
index 2fc33016..1014e567 100644
--- a/install.rdf
+++ b/install.rdf
@@ -189,6 +189,20 @@
Regmos (da-DK)
+
+
+ Zusukar (auto-shrink mode)
+ Alice0775 (compatibility problem)
+ Philipp von Weitershausen (Sidebar style)
+ wanabe (some bug fixes)
+ Tetsuharu OHZEKI (code cleanup)
+ Vlastimil Ovčáčík (cs)
+
+
diff --git a/locale/cs/treestyletab/license.txt b/locale/cs/treestyletab/license.txt
new file mode 100644
index 00000000..5ccdbf94
--- /dev/null
+++ b/locale/cs/treestyletab/license.txt
@@ -0,0 +1,34 @@
+***** BEGIN LICENSE BLOCK *****
+Version: MPL 1.1/GPL 2.0/LGPL 2.1
+
+The contents of these files are subject to the Mozilla Public License Version
+1.1 (the "License"); you may not use these files 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 YUKI "Piro" Hiroshi.
+Portions created by the Initial Developer are Copyright (C) 2007-2014
+the Initial Developer. All Rights Reserved.
+
+Contributor(s): Vlastimil Ovcacik
+
+Alternatively, the contents of these files 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 these files only
+under the terms of either the GPL or the LGPL, and not to allow others to
+use your version of these files 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 these files under
+the terms of any one of the MPL, the GPL or the LGPL.
+
+***** END LICENSE BLOCK *****
diff --git a/locale/cs/treestyletab/treestyletab.dtd b/locale/cs/treestyletab/treestyletab.dtd
new file mode 100644
index 00000000..57f48e8a
--- /dev/null
+++ b/locale/cs/treestyletab/treestyletab.dtd
@@ -0,0 +1,187 @@
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diff --git a/locale/cs/treestyletab/treestyletab.properties b/locale/cs/treestyletab/treestyletab.properties
new file mode 100644
index 00000000..f3bbac52
--- /dev/null
+++ b/locale/cs/treestyletab/treestyletab.properties
@@ -0,0 +1,55 @@
+tooltip.collapseSubtree=Collapse Tree
+tooltip.collapseSubtree.labeled=Collapse Tree:\n%S
+tooltip.expandSubtree=Expand Tree
+tooltip.expandSubtree.labeled=Expand Tree:\n%S
+tooltip.closeTree=Close this Tree
+tooltip.closeTree.labeled=Close this Tree:\n%S
+tooltip.item.label=%2$S* %1$S
+tooltip.more=...and %1$S more tab(s)
+
+dropLinkOnTab.title=How to open the dropped link?
+dropLinkOnTab.text=A link has been dropped onto existing tab. Tree Style Tab can open the link as a new child tab. How to deal with the link?
+dropLinkOnTab.never=Never ask me, and do same operation hereafter
+dropLinkOnTab.loadInTheTab=Load into the tab (Firefox default)
+dropLinkOnTab.openNewChildTab=Open as a New Child Tab
+
+openGroupBookmarkBehavior.title=How to open multiple bookmarks?
+openGroupBookmarkBehavior.text=Now multiple tabs will be opened from bookmarks. How to open them?
+openGroupBookmarkBehavior.never=Never ask me, and do same operation hereafter
+openGroupBookmarkBehavior.subTree=Open as a New Tree
+openGroupBookmarkBehavior.separate=Open as Separate Tabs (Firefox default)
+openGroupBookmarkBehavior.replace=Replace current one tab
+
+bookmarkDroppedTabs.title=How to bookmark a tree of tabs?
+bookmarkDroppedTabs.text=The dragged tab has children. How to bookmark them?
+bookmarkDroppedTabs.never=Never ask me again
+bookmarkDroppedTabs.bookmarkAll=Bookmark All Tabs in the tree
+bookmarkDroppedTabs.bookmarkOnlyParent=Bookmark the Parent Tab Only.
+
+undoCloseTabSetBehavior.label=This tab was closed together with other %S tab(s) in a tree. Do you want them to be restored along?
+undoCloseTabSetBehavior.restoreOnce=Restore tabs
+undoCloseTabSetBehavior.restoreForever=Always resotre tabs
+undoCloseTabSetBehavior.ignoreForever=Never show this notification
+
+openSelectedPlaces.bookmarks=from %2$S bookmarks, including "%1$S"
+openSelectedPlaces.history=from %2$S history entries, including "%1$S"
+
+bookmarkProperty.parent.label=Parent tab:
+bookmarkProperty.parent.blank.label=(nothing)
+bookmarkProperty.parent.current.label=[ %S ]
+
+undo_changeTabbarPosition_label=Change the position of the tab bar
+
+toolbarCustomizing_tabbar_horizontal=This toolbar becomes a tab bar.
+toolbarCustomizing_tabbar_vertical=This toolbar becomes a vertical tab bar.
+
+
+compatibility_STM_warning_title=Super Tab Mode collides with Tree Style Tab
+compatibility_STM_warning_text=New tabs opened from links (or others) don't become child of the current tab, because the position of new tabs is controlled by Super Tab Mode. Which feature do you want to be enabled?\n(*You can change those settings manually by the configuration dialog of Super Tab Mode.)
+compatibility_STM_warning_use_TST=Make tabs children of the current tab
+compatibility_STM_warning_use_STM=Put tabs to the position specified by Super Tab Mode
+compatibility_STM_warning_never=Don't show this dialo anymore.
+
+
+closeTabsToTheEnd_vertical_label=Close Tabs to the Bottom
+closeTabsToTheEnd_vertical_accesskey=b