diff --git a/content/treestyletab/config.js b/content/treestyletab/config.js
index 22aebe24..de6d7cf6 100644
--- a/content/treestyletab/config.js
+++ b/content/treestyletab/config.js
@@ -69,6 +69,7 @@ function onChangeTabbarPosition(aOnChange)
 	var indentCheck   = document.getElementById('extensions.treestyletab.enableSubtreeIndent-check');
 	var collapseCheck = document.getElementById('extensions.treestyletab.allowSubtreeCollapseExpand-check');
 //	var autoHideCheck = document.getElementById('extensions.treestyletab.tabbar.autoHide.enabled-check');
+	var hideNewTabCheck = document.getElementById('extensions.treestyletab.tabbar.hideNewTabButton-check');
 	var hideAllTabsCheck = document.getElementById('extensions.treestyletab.tabbar.hideAlltabsButton-check');
 
 	if (aOnChange) {
@@ -78,11 +79,13 @@ function onChangeTabbarPosition(aOnChange)
 	if (pos == 'left' || pos == 'right') {
 		indentCheck.setAttribute('collapsed', true);
 //		autoHideCheck.removeAttribute('collapsed');
+		hideNewTabCheck.removeAttribute('collapsed');
 		hideAllTabsCheck.removeAttribute('collapsed');
 	}
 	else {
 		indentCheck.removeAttribute('collapsed');
 //		autoHideCheck.setAttribute('collapsed', true);
+		hideNewTabCheck.setAttribute('collapsed', true);
 		hideAllTabsCheck.setAttribute('collapsed', true);
 	}
 
diff --git a/content/treestyletab/config.xul b/content/treestyletab/config.xul
index fbcf111e..7c05bdb1 100644
--- a/content/treestyletab/config.xul
+++ b/content/treestyletab/config.xul
@@ -29,6 +29,10 @@
 		<preference id="extensions.treestyletab.allowSubtreeCollapseExpand"
 			name="extensions.treestyletab.allowSubtreeCollapseExpand"
 			type="bool"/>
+		<preference id="extensions.treestyletab.tabbar.hideNewTabButton"
+			name="extensions.treestyletab.tabbar.hideNewTabButton"
+			type="bool"
+			inverted="true"/>
 		<preference id="extensions.treestyletab.tabbar.hideAlltabsButton"
 			name="extensions.treestyletab.tabbar.hideAlltabsButton"
 			type="bool"
@@ -97,9 +101,14 @@
 			<checkbox id="extensions.treestyletab.allowSubtreeCollapseExpand-check"
 				preference="extensions.treestyletab.allowSubtreeCollapseExpand"
 				label="&config.allowSubtreeCollapseExpand;"/>
+		</hbox>
+		<hbox align="center">
 			<checkbox id="extensions.treestyletab.enableSubtreeIndent-check"
 				preference="extensions.treestyletab.enableSubtreeIndent"
 				label="&config.enableSubtreeIndent;"/>
+			<checkbox id="extensions.treestyletab.tabbar.hideNewTabButton-check"
+				preference="extensions.treestyletab.tabbar.hideNewTabButton"
+				label="&config.tabbar.hideNewTabButton;"/>
 			<checkbox id="extensions.treestyletab.tabbar.hideAlltabsButton-check"
 				preference="extensions.treestyletab.tabbar.hideAlltabsButton"
 				label="&config.tabbar.hideAlltabsButton;"/>
diff --git a/content/treestyletab/treestyletab.css b/content/treestyletab/treestyletab.css
index f3f8441b..9e0fbe4d 100644
--- a/content/treestyletab/treestyletab.css
+++ b/content/treestyletab/treestyletab.css
@@ -28,8 +28,9 @@ tabbrowser[treestyletab-tabbar-fixed="true"] .tabbrowser-strip+splitter {
 tabbrowser:not([treestyletab-mode="horizontal"]) .tabbrowser-arrowscrollbox > .scrollbutton-up,
 tabbrowser:not([treestyletab-mode="horizontal"]) .tabbrowser-arrowscrollbox > .scrollbutton-down-stack,
 tabbrowser:not([treestyletab-mode="horizontal"]) .tabbrowser-arrowscrollbox > .scrollbutton-down, /* Firefox 3 */
+tabbrowser[treestyletab-hide-newtab-button="true"] .tabs-newtab-button, /* "open a new tab" button in Firefox 3.1 */
 tabbrowser[treestyletab-hide-alltabs-button="true"] .tabs-alltabs-stack,
-tabbrowser[treestyletab-hide-alltabs-button="true"] .tabbrowser-arrowscrollbox + stack, /* "all tabs" button in Firefox 3 */
+tabbrowser[treestyletab-hide-alltabs-button="true"] .tabbrowser-arrowscrollbox ~ stack, /* "all tabs" button in Firefox 3 and 3.1 */
 tabbrowser[treestyletab-mode="vertical"] .tabs-closebutton-box,
 tabbrowser:not([treestyletab-mode="horizontal"]) .tab-drop-indicator-bar,
 tabbrowser:not([treestyletab-mode="horizontal"]) #vide-bar, /* Tab Mix Plus */
diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index 7a4f3e28..71d40392 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -14,6 +14,7 @@ var TreeStyleTabService = {
 	kUI_INVERTED        : 'treestyletab-appearance-inverted',
 	kSCROLLBAR_INVERTED : 'treestyletab-scrollbar-inverted',
 	kALLOW_COLLAPSE     : 'treestyletab-allow-subtree-collapse',
+	kHIDE_NEWTAB        : 'treestyletab-hide-newtab-button',
 	kHIDE_ALLTABS       : 'treestyletab-hide-alltabs-button',
 	kSTYLE              : 'treestyletab-style',
 	kTWISTY_STYLE       : 'treestyletab-twisty-style',
diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index ca1908dc..93727f0e 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -429,6 +429,7 @@ TreeStyleTabBrowser.prototype = {
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.twisty.style');
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.showBorderForFirstTab');
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.tabbar.invertScrollbar');
+		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.tabbar.hideNewTabButton');
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.tabbar.hideAlltabsButton');
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.allowSubtreeCollapseExpand');
 		this.observe(null, 'nsPref:changed', 'extensions.treestyletab.tabbar.fixed');
@@ -956,6 +957,14 @@ TreeStyleTabBrowser.prototype = {
 							b.removeAttribute(this.kSCROLLBAR_INVERTED);
 						break;
 
+					case 'extensions.treestyletab.tabbar.hideNewTabButton':
+						var pos = b.getAttribute(this.kTABBAR_POSITION);
+						if (value && (pos == 'left' || pos == 'right'))
+							b.setAttribute(this.kHIDE_NEWTAB, true);
+						else
+							b.removeAttribute(this.kHIDE_NEWTAB);
+						break;
+
 					case 'extensions.treestyletab.tabbar.hideAlltabsButton':
 						var pos = b.getAttribute(this.kTABBAR_POSITION);
 						if (value && (pos == 'left' || pos == 'right'))
diff --git a/defaults/preferences/treestyletab.js b/defaults/preferences/treestyletab.js
index d9a9d123..70db2296 100644
--- a/defaults/preferences/treestyletab.js
+++ b/defaults/preferences/treestyletab.js
@@ -5,6 +5,7 @@ pref("extensions.treestyletab.tabbar.position.subbrowser.enabled", false);
 pref("extensions.treestyletab.tabbar.multirow",        false);
 pref("extensions.treestyletab.tabbar.invertScrollbar", true);
 pref("extensions.treestyletab.tabbar.invertUI",        true);
+pref("extensions.treestyletab.tabbar.hideNewTabButton", false);
 pref("extensions.treestyletab.tabbar.hideAlltabsButton", true);
 pref("extensions.treestyletab.tabbar.scroll.smooth",   true);
 pref("extensions.treestyletab.tabbar.scroll.timeout",  250);
diff --git a/locale/de-DE/treestyletab/treestyletab.dtd b/locale/de-DE/treestyletab/treestyletab.dtd
index 51f607b3..4a50725a 100644
--- a/locale/de-DE/treestyletab/treestyletab.dtd
+++ b/locale/de-DE/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "Reihenfolge der Tabs umdrehen">
 <!ENTITY config.enableSubtreeIndent         "Tabs einrücken">
 <!ENTITY config.allowSubtreeCollapseExpand  "Auf- und Einklappen von Zweigen erlauben">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "Button zum Auflisten aller Tabs anzeigen">
 
 <!ENTITY config.tabbar.style.caption "Aussehen der Tableiste">
diff --git a/locale/en-US/treestyletab/treestyletab.dtd b/locale/en-US/treestyletab/treestyletab.dtd
index d997ba1b..9dd67a99 100644
--- a/locale/en-US/treestyletab/treestyletab.dtd
+++ b/locale/en-US/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "Invert tab appearance">
 <!ENTITY config.enableSubtreeIndent         "Indent tabs">
 <!ENTITY config.allowSubtreeCollapseExpand  "Allow to collapse/expand sub tree of tabs">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "Show &quot;List all tabs&quot; button">
 
 <!ENTITY config.tabbar.style.caption "Appearance of the tab bar">
diff --git a/locale/es-ES/treestyletab/treestyletab.dtd b/locale/es-ES/treestyletab/treestyletab.dtd
index 072d2cb5..9db3efb1 100644
--- a/locale/es-ES/treestyletab/treestyletab.dtd
+++ b/locale/es-ES/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "Invertir apariencia de pestaña">
 <!ENTITY config.enableSubtreeIndent         "Añadir margen a las pestañas">
 <!ENTITY config.allowSubtreeCollapseExpand  "Permitir colapsar/expandir los sub-árboles de las pestañas">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "Mostrar el botón &quot;Listar todas las pestañas&quot;">
 
 <!ENTITY config.tabbar.style.caption "Apariencia de la barra de pestañas">
diff --git a/locale/it-IT/treestyletab/treestyletab.dtd b/locale/it-IT/treestyletab/treestyletab.dtd
index 9b36a7bd..c6360336 100644
--- a/locale/it-IT/treestyletab/treestyletab.dtd
+++ b/locale/it-IT/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "Inverti la visualizzazione delle schede">
 <!ENTITY config.enableSubtreeIndent         "Indenta schede figlie">
 <!ENTITY config.allowSubtreeCollapseExpand  "Permetti di contrarre/espandere sottoalberi delle schede">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "Visualizza la maniglia per elencare tutte le schede">
 
 <!ENTITY config.tabbar.style.caption "Aspetto delle barra delle schede">
diff --git a/locale/ja/treestyletab/treestyletab.dtd b/locale/ja/treestyletab/treestyletab.dtd
index d59bb792..5652503a 100644
--- a/locale/ja/treestyletab/treestyletab.dtd
+++ b/locale/ja/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "タブを左右反転">
 <!ENTITY config.enableSubtreeIndent         "タブをインデント表示する">
 <!ENTITY config.allowSubtreeCollapseExpand  "サブツリーを折りたためるようにする">
+<!ENTITY config.tabbar.hideNewTabButton     "「新しいタブを開く」ボタンを表示する">
 <!ENTITY config.tabbar.hideAlltabsButton    "「タブの一覧を表示」ボタンを表示する">
 
 <!ENTITY config.tabbar.style.caption "タブバーの表示スタイル">
diff --git a/locale/zh-CN/treestyletab/treestyletab.dtd b/locale/zh-CN/treestyletab/treestyletab.dtd
index c6bff90e..d02102f1 100644
--- a/locale/zh-CN/treestyletab/treestyletab.dtd
+++ b/locale/zh-CN/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "反转标签外观">
 <!ENTITY config.enableSubtreeIndent         "缩进标签">
 <!ENTITY config.allowSubtreeCollapseExpand  "允许折叠/展开标签子树">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "显示 &quot;列出所有标签&quot; 按钮">
 
 <!ENTITY config.tabbar.style.caption "标签栏外观">
diff --git a/locale/zh-TW/treestyletab/treestyletab.dtd b/locale/zh-TW/treestyletab/treestyletab.dtd
index a7e94324..6bd01cb3 100644
--- a/locale/zh-TW/treestyletab/treestyletab.dtd
+++ b/locale/zh-TW/treestyletab/treestyletab.dtd
@@ -14,6 +14,7 @@
 <!ENTITY config.tabbar.invertUI         "左右反轉分頁外觀">
 <!ENTITY config.enableSubtreeIndent         "縮進分頁">
 <!ENTITY config.allowSubtreeCollapseExpand  "允許摺疊 / 展開樹狀子目錄">
+<!ENTITY config.tabbar.hideNewTabButton     "Show &quot;Open a new tab&quot; button">
 <!ENTITY config.tabbar.hideAlltabsButton    "顯示「列出所有分頁」按鈕">
 
 <!ENTITY config.tabbar.style.caption "分頁工具列的外觀">