diff --git a/content/treestyletab/config.xul b/content/treestyletab/config.xul
index 151a877e..2de975ce 100644
--- a/content/treestyletab/config.xul
+++ b/content/treestyletab/config.xul
@@ -340,36 +340,105 @@
 		<preference id="extensions.treestyletab.tabbar.autoShow.mousemove"
 			name="extensions.treestyletab.tabbar.autoShow.mousemove"
 			type="bool"/>
+		<preference id="extensions.treestyletab.tabbar.autoHide.area"
+			name="extensions.treestyletab.tabbar.autoHide.area"
+			type="int"/>
+		<preference id="extensions.treestyletab.tabbar.autoHide.delay"
+			name="extensions.treestyletab.tabbar.autoHide.delay"
+			type="int"/>
 		<preference id="extensions.treestyletab.tabbar.autoShow.accelKeyDown"
 			name="extensions.treestyletab.tabbar.autoShow.accelKeyDown"
 			type="bool"/>
+		<preference id="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay"
+			name="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay"
+			type="int"/>
 		<preference id="extensions.treestyletab.tabbar.autoShow.tabSwitch"
 			name="extensions.treestyletab.tabbar.autoShow.tabSwitch"
 			type="bool"/>
 		<preference id="extensions.treestyletab.tabbar.autoShow.feedback"
 			name="extensions.treestyletab.tabbar.autoShow.feedback"
 			type="bool"/>
+		<preference id="extensions.treestyletab.tabbar.autoShow.feedback.delay"
+			name="extensions.treestyletab.tabbar.autoShow.feedback.delay"
+			type="int"/>
+		<preference id="extensions.treestyletab.tabbar.transparent.style"
+			name="extensions.treestyletab.tabbar.transparent.style"
+			type="int"/>
 	</preferences>
 
 	<vbox>
 
 		<checkbox id="extensions.treestyletab.tabbar.autoHide.enabled-check"
 			preference="extensions.treestyletab.tabbar.autoHide.enabled"
-			label="&config.tabbar.autoHide.enabled;"/>
+			label="&config.autoHide.enabled;"/>
+
 		<groupbox orient="vertical">
-			<caption label="&config.tabbar.autoShow.caption;"/>
+			<caption label="&config.autoShow.caption;"/>
 			<checkbox id="extensions.treestyletab.tabbar.autoShow.mousemove-check"
 				preference="extensions.treestyletab.tabbar.autoShow.mousemove"
-				label="&config.tabbar.autoShow.mousemove;"/>
+				label="&config.autoShow.mousemove;"/>
+			<hbox align="center">
+				<spacer style="width:1em;"/>
+				<label value="&config.autoHide.area.before;"
+					control="extensions.treestyletab.tabbar.autoHide.area-textbox"/>
+				<textbox id="extensions.treestyletab.tabbar.autoHide.area-textbox"
+					preference="extensions.treestyletab.tabbar.autoHide.area"
+					type="number"
+					min="0" increment="1" style="width:4em;"/>
+				<label value="&config.autoHide.area.after;"
+					control="extensions.treestyletab.tabbar.autoHide.area-textbox"/>
+			</hbox>
+			<hbox align="center">
+				<spacer style="width:1em;"/>
+				<label value="&config.autoHide.delay.before;"
+					control="extensions.treestyletab.tabbar.autoHide.delay-textbox"/>
+				<textbox id="extensions.treestyletab.tabbar.autoHide.delay-textbox"
+					preference="extensions.treestyletab.tabbar.autoHide.delay"
+					type="number"
+					min="0" increment="1" style="width:4em;"/>
+				<label value="&config.autoHide.delay.after;"
+					control="extensions.treestyletab.tabbar.autoHide.delay-textbox"/>
+			</hbox>
 			<checkbox id="extensions.treestyletab.tabbar.autoShow.accelKeyDown-check"
 				preference="extensions.treestyletab.tabbar.autoShow.accelKeyDown"
-				label="&config.tabbar.autoShow.accelKeyDown;"/>
+				label="&config.autoShow.accelKeyDown;"/>
+			<hbox align="center">
+				<spacer style="width:1em;"/>
+				<label value="&config.autoShow.accelKeyDown.delay.before;"
+					control="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay-textbox"/>
+				<textbox id="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay-textbox"
+					preference="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay"
+					type="number"
+					min="0" increment="1" style="width:4em;"/>
+				<label value="&config.autoShow.accelKeyDown.delay.after;"
+					control="extensions.treestyletab.tabbar.autoShow.accelKeyDown.delay-textbox"/>
+			</hbox>
 			<checkbox id="extensions.treestyletab.tabbar.autoShow.tabSwitch-check"
 				preference="extensions.treestyletab.tabbar.autoShow.tabSwitch"
-				label="&config.tabbar.autoShow.tabSwitch;"/>
+				label="&config.autoShow.tabSwitch;"/>
 			<checkbox id="extensions.treestyletab.tabbar.autoShow.feedback-check"
 				preference="extensions.treestyletab.tabbar.autoShow.feedback"
-				label="&config.tabbar.autoShow.feedback;"/>
+				label="&config.autoShow.feedback;"/>
+			<hbox align="center">
+				<spacer style="width:1em;"/>
+				<label value="&config.autoShow.feedback.delay.before;"
+					control="extensions.treestyletab.tabbar.autoShow.feedback.delay-textbox"/>
+				<textbox id="extensions.treestyletab.tabbar.autoShow.feedback.delay-textbox"
+					preference="extensions.treestyletab.tabbar.autoShow.feedback.delay"
+					type="number"
+					min="0" increment="1" style="width:4em;"/>
+				<label value="&config.autoShow.feedback.delay.after;"
+					control="extensions.treestyletab.tabbar.autoShow.feedback.delay-textbox"/>
+			</hbox>
+		</groupbox>
+		<groupbox orient="vertical">
+			<caption label="&config.transparent.style.caption;"/>
+			<radiogroup orient="horizontal"
+				preference="extensions.treestyletab.tabbar.transparent.style">
+				<radio label="&config.transparent.style.0;" value="0"/>
+				<radio label="&config.transparent.style.1;" value="1"/>
+				<radio label="&config.transparent.style.2;" value="2"/>
+			</radiogroup>
 		</groupbox>
 
 	</vbox>
@@ -397,12 +466,6 @@
 		<preference id="extensions.treestyletab.insertNewChildAt"
 			name="extensions.treestyletab.insertNewChildAt"
 			type="int"/>
-		<preference id="extensions.treestyletab.tabbar.autoHide.area"
-			name="extensions.treestyletab.tabbar.autoHide.area"
-			type="int"/>
-		<preference id="extensions.treestyletab.tabbar.autoHide.delay"
-			name="extensions.treestyletab.tabbar.autoHide.delay"
-			type="int"/>
 	</preferences>
 
 	<vbox>
@@ -434,30 +497,6 @@
 		</radiogroup>
 	</groupbox>
 
-	<groupbox>
-		<caption label="&config.autoHide.caption;"/>
-		<hbox align="center">
-			<label value="&config.autoHide.area.before;"
-				control="extensions.treestyletab.tabbar.autoHide.area-textbox"/>
-			<textbox id="extensions.treestyletab.tabbar.autoHide.area-textbox"
-				preference="extensions.treestyletab.tabbar.autoHide.area"
-				type="number"
-				min="0" increment="1" style="width:4em;"/>
-			<label value="&config.autoHide.area.after;"
-				control="extensions.treestyletab.tabbar.autoHide.area-textbox"/>
-		</hbox>
-		<hbox align="center">
-			<label value="&config.autoHide.delay.before;"
-				control="extensions.treestyletab.tabbar.autoHide.delay-textbox"/>
-			<textbox id="extensions.treestyletab.tabbar.autoHide.delay-textbox"
-				preference="extensions.treestyletab.tabbar.autoHide.delay"
-				type="number"
-				min="0" increment="1" style="width:4em;"/>
-			<label value="&config.autoHide.delay.after;"
-				control="extensions.treestyletab.tabbar.autoHide.delay-textbox"/>
-		</hbox>
-	</groupbox>
-
 	</vbox>
 </prefpane>
 
diff --git a/locale/en-US/treestyletab/treestyletab.dtd b/locale/en-US/treestyletab/treestyletab.dtd
index 66660aab..625117ac 100644
--- a/locale/en-US/treestyletab/treestyletab.dtd
+++ b/locale/en-US/treestyletab/treestyletab.dtd
@@ -70,12 +70,25 @@
 
 <!ENTITY config.tabs.autohide "Auto hide">
 
-<!ENTITY config.tabbar.autoHide.enabled     "Auto hide tab bar">
-<!ENTITY config.tabbar.autoShow.caption "Show tab bar automatically when">
-<!ENTITY config.tabbar.autoShow.mousemove "Mouse cursor points window edges">
-<!ENTITY config.tabbar.autoShow.accelKeyDown "Control(Command) key is pressed a while">
-<!ENTITY config.tabbar.autoShow.tabSwitch   "Control(Command)-Tab to switch tabs">
-<!ENTITY config.tabbar.autoShow.feedback    "New tabs are opened or some tabs are closed">
+<!ENTITY config.autoHide.enabled     "Auto hide tab bar">
+<!ENTITY config.autoShow.caption "Show tab bar automatically when">
+<!ENTITY config.autoShow.mousemove "Mouse cursor points window edges">
+<!ENTITY config.autoHide.area.before "Sensitive area:">
+<!ENTITY config.autoHide.area.after "pixels from window edges">
+<!ENTITY config.autoHide.delay.before "Delay:">
+<!ENTITY config.autoHide.delay.after "msec.">
+<!ENTITY config.autoShow.accelKeyDown "Control(Command) key is pressed a while">
+<!ENTITY config.autoShow.accelKeyDown.delay.before "Show after">
+<!ENTITY config.autoShow.accelKeyDown.delay.after  "msec.">
+<!ENTITY config.autoShow.tabSwitch   "Control(Command)-Tab to switch tabs">
+<!ENTITY config.autoShow.feedback    "New tabs are opened or some tabs are closed">
+<!ENTITY config.autoShow.feedback.delay.before "Hide after">
+<!ENTITY config.autoShow.feedback.delay.after  "msec.">
+
+<!ENTITY config.transparent.style.caption "Background of tab bar">
+<!ENTITY config.transparent.style.0 "Solid">
+<!ENTITY config.transparent.style.1 "Half-transparent">
+<!ENTITY config.transparent.style.2 "Transparent">
 
 
 <!ENTITY config.tabs.advanced "Advanced">
@@ -93,12 +106,6 @@
 <!ENTITY config.insertNewChildAt.first "Insert to the top of the sub tree, as the first child">
 <!ENTITY config.insertNewChildAt.last "Append to the last of the sub tree">
 
-<!ENTITY config.autoHide.caption "Auto hide tab bar">
-<!ENTITY config.autoHide.area.before "Sensitive area:">
-<!ENTITY config.autoHide.area.after "pixels from window edges">
-<!ENTITY config.autoHide.delay.before "Delay:">
-<!ENTITY config.autoHide.delay.after "msec.">
-
 
 
 
diff --git a/locale/es-ES/treestyletab/treestyletab.dtd b/locale/es-ES/treestyletab/treestyletab.dtd
index 50057d63..cabbfe44 100644
--- a/locale/es-ES/treestyletab/treestyletab.dtd
+++ b/locale/es-ES/treestyletab/treestyletab.dtd
@@ -70,12 +70,25 @@
 
 <!ENTITY config.tabs.autohide "Auto hide">
 
-<!ENTITY config.tabbar.autoHide.enabled     "Auto-ocultar la barra de pestañas">
-<!ENTITY config.tabbar.autoShow.caption "Show tab bar automatically when">
-<!ENTITY config.tabbar.autoShow.mousemove "Mouse cursor points window edges">
-<!ENTITY config.tabbar.autoShow.accelKeyDown "Control(Command) key is pressed a while">
-<!ENTITY config.tabbar.autoShow.tabSwitch   "Control(Command)-Tab to switch tabs">
-<!ENTITY config.tabbar.autoShow.feedback    "New tabs are opened or some tabs are closed">
+<!ENTITY config.autoHide.enabled     "Auto-ocultar la barra de pestañas">
+<!ENTITY config.autoShow.caption "Show tab bar automatically when">
+<!ENTITY config.autoShow.mousemove "Mouse cursor points window edges">
+<!ENTITY config.autoHide.area.before "Área sensible:">
+<!ENTITY config.autoHide.area.after "pixeles del borde de la ventana">
+<!ENTITY config.autoHide.delay.before "Retraso:">
+<!ENTITY config.autoHide.delay.after "mseg.">
+<!ENTITY config.autoShow.accelKeyDown "Control(Command) key is pressed a while">
+<!ENTITY config.autoShow.accelKeyDown.delay.before "Show after">
+<!ENTITY config.autoShow.accelKeyDown.delay.after  "msec.">
+<!ENTITY config.autoShow.tabSwitch   "Control(Command)-Tab to switch tabs">
+<!ENTITY config.autoShow.feedback    "New tabs are opened or some tabs are closed">
+<!ENTITY config.autoShow.feedback.delay.before "Hide after">
+<!ENTITY config.autoShow.feedback.delay.after  "msec.">
+
+<!ENTITY config.transparent.style.caption "Background of tab bar">
+<!ENTITY config.transparent.style.0 "Solid">
+<!ENTITY config.transparent.style.1 "Half-transparent">
+<!ENTITY config.transparent.style.2 "Transparent">
 
 
 <!ENTITY config.tabs.advanced "Avanzado">
@@ -93,12 +106,6 @@
 <!ENTITY config.insertNewChildAt.first "Insertar arriba del todo en el árbol">
 <!ENTITY config.insertNewChildAt.last "Insertar abajo del todo en el árbol">
 
-<!ENTITY config.autoHide.caption "Auto-ocultar la barra de pestañas">
-<!ENTITY config.autoHide.area.before "Área sensible:">
-<!ENTITY config.autoHide.area.after "pixeles del borde de la ventana">
-<!ENTITY config.autoHide.delay.before "Retraso:">
-<!ENTITY config.autoHide.delay.after "mseg.">
-
 
 
 
diff --git a/locale/it-IT/treestyletab/treestyletab.dtd b/locale/it-IT/treestyletab/treestyletab.dtd
index de890c8b..6b4a18ab 100644
--- a/locale/it-IT/treestyletab/treestyletab.dtd
+++ b/locale/it-IT/treestyletab/treestyletab.dtd
@@ -22,7 +22,7 @@
 <!ENTITY config.tabbar.style.mixed   "Misto">
 
 <!ENTITY config.twisty.style.caption "Aspetto controlli contrazione/espansione sottoalberi">
-<!ENTITY config.twisty.style.auto    "Auto"><!-- not translated yet -->
+<!ENTITY config.twisty.style.auto    "Automatico">
 <!ENTITY config.twisty.style.none    "Nessuno">
 <!ENTITY config.twisty.style.retro   "Retro">
 <!ENTITY config.twisty.style.modern.black "Black Modern">
@@ -68,14 +68,27 @@
 <!ENTITY config.jsopen.forcetab "ad aprirsi tutti in nuove schede (Raccomandato)">
 
 
-<!ENTITY config.tabs.autohide "Auto hide">
+<!ENTITY config.tabs.autohide "Visualizzazione">
 
-<!ENTITY config.tabbar.autoHide.enabled     "Nascondi automaticamente la barra delle schede">
-<!ENTITY config.tabbar.autoShow.caption "Show tab bar automatically when">
-<!ENTITY config.tabbar.autoShow.mousemove "Mouse cursor points window edges">
-<!ENTITY config.tabbar.autoShow.accelKeyDown "Control(Command) key is pressed a while">
-<!ENTITY config.tabbar.autoShow.tabSwitch   "Control(Command)-Tab to switch tabs">
-<!ENTITY config.tabbar.autoShow.feedback    "New tabs are opened or some tabs are closed">
+<!ENTITY config.autoHide.enabled     "Nascondi automaticamente la barra delle schede">
+<!ENTITY config.autoShow.caption "Visualizza la barra della schede quando">
+<!ENTITY config.autoShow.mousemove "Viene spostato il mouse in prossimità del bordo della finestra">
+<!ENTITY config.autoHide.area.before "Area di attivazione:">
+<!ENTITY config.autoHide.area.after "distanza dai bordi della finestra (in pixel)">
+<!ENTITY config.autoHide.delay.before "Ritardo:">
+<!ENTITY config.autoHide.delay.after "msec.">
+<!ENTITY config.autoShow.accelKeyDown "Viene tenuto premuto il tasto Control (Command)">
+<!ENTITY config.autoShow.accelKeyDown.delay.before "Show after">
+<!ENTITY config.autoShow.accelKeyDown.delay.after  "msec.">
+<!ENTITY config.autoShow.tabSwitch   "Viene utilizzata la scorciatoia Control (Command)+Tab per passare da una scheda all&apos;altra">
+<!ENTITY config.autoShow.feedback    "Viene aperta o chiusa una scheda">
+<!ENTITY config.autoShow.feedback.delay.before "Hide after">
+<!ENTITY config.autoShow.feedback.delay.after  "msec.">
+
+<!ENTITY config.transparent.style.caption "Background of tab bar">
+<!ENTITY config.transparent.style.0 "Solid">
+<!ENTITY config.transparent.style.1 "Half-transparent">
+<!ENTITY config.transparent.style.2 "Transparent">
 
 
 <!ENTITY config.tabs.advanced "Avanzate">
@@ -93,12 +106,6 @@
 <!ENTITY config.insertNewChildAt.first "Inserisci all&apos;inizio del sottoalbero, come prima figlia">
 <!ENTITY config.insertNewChildAt.last "Accoda all&apos;ultimo sottoalbero">
 
-<!ENTITY config.autoHide.caption "Nascondi automaticamente la barra delle schede">
-<!ENTITY config.autoHide.area.before "Area di attivazione:">
-<!ENTITY config.autoHide.area.after "distanza dai bordi della finestra (in pixel)">
-<!ENTITY config.autoHide.delay.before "Ritardo:">
-<!ENTITY config.autoHide.delay.after "msec.">
-
 
 
 
diff --git a/locale/ja/treestyletab/treestyletab.dtd b/locale/ja/treestyletab/treestyletab.dtd
index bd4f9a3d..a6de7b68 100644
--- a/locale/ja/treestyletab/treestyletab.dtd
+++ b/locale/ja/treestyletab/treestyletab.dtd
@@ -70,12 +70,25 @@
 
 <!ENTITY config.tabs.autohide "自動的に隠す">
 
-<!ENTITY config.tabbar.autoHide.enabled "タブバーを自動的に隠す">
-<!ENTITY config.tabbar.autoShow.caption "以下の場合に自動的にタブバーを表示する">
-<!ENTITY config.tabbar.autoShow.mousemove "ウィンドウの端にポインタが近づいた時">
-<!ENTITY config.tabbar.autoShow.accelKeyDown "Control(Command)キーを長押しした時">
-<!ENTITY config.tabbar.autoShow.tabSwitch   "Control(Command)-Tabでタブを切り替える時">
-<!ENTITY config.tabbar.autoShow.feedback    "新しいタブが開かれたりタブが閉じられたりした時">
+<!ENTITY config.autoHide.enabled "タブバーを自動的に隠す">
+<!ENTITY config.autoShow.caption "以下の場合に自動的にタブバーを表示する">
+<!ENTITY config.autoShow.mousemove "ウィンドウの端にポインタが近づいた時">
+<!ENTITY config.autoHide.area.before "反応する領域：ウィンドウの端から">
+<!ENTITY config.autoHide.area.after "ピクセルの範囲">
+<!ENTITY config.autoHide.delay.before "遅延：">
+<!ENTITY config.autoHide.delay.after "ミリ秒">
+<!ENTITY config.autoShow.accelKeyDown "Control(Command)キーを長押しした時">
+<!ENTITY config.autoShow.accelKeyDown.delay.before "">
+<!ENTITY config.autoShow.accelKeyDown.delay.after  "ミリ秒以上で反応">
+<!ENTITY config.autoShow.tabSwitch   "Control(Command)-Tabでタブを切り替える時">
+<!ENTITY config.autoShow.feedback    "新しいタブが開かれたりタブが閉じられたりした時">
+<!ENTITY config.autoShow.feedback.delay.before "">
+<!ENTITY config.autoShow.feedback.delay.after  "ミリ秒後に自動で隠す">
+
+<!ENTITY config.transparent.style.caption "自動で隠す時のタブバーの背景">
+<!ENTITY config.transparent.style.0 "透過しない">
+<!ENTITY config.transparent.style.1 "半透明">
+<!ENTITY config.transparent.style.2 "完全な透明">
 
 
 <!ENTITY config.tabs.advanced "詳細">
@@ -93,12 +106,6 @@
 <!ENTITY config.insertNewChildAt.first "サブツリーの最初の位置に挿入する">
 <!ENTITY config.insertNewChildAt.last "サブツリーの末尾に追加する">
 
-<!ENTITY config.autoHide.caption "タブバーを自動的に隠す">
-<!ENTITY config.autoHide.area.before "反応する領域：ウィンドウの端から">
-<!ENTITY config.autoHide.area.after "ピクセルの範囲">
-<!ENTITY config.autoHide.delay.before "遅延：">
-<!ENTITY config.autoHide.delay.after "ミリ秒">
-
 
 
 <!ENTITY context.openSelectionLinks.label     "選択したリンクをすべてタブで開く">
diff --git a/locale/zh-CN/treestyletab/treestyletab.dtd b/locale/zh-CN/treestyletab/treestyletab.dtd
index 4be46b09..9180ea93 100644
--- a/locale/zh-CN/treestyletab/treestyletab.dtd
+++ b/locale/zh-CN/treestyletab/treestyletab.dtd
@@ -70,12 +70,25 @@
 
 <!ENTITY config.tabs.autohide "自动隐藏">
 
-<!ENTITY config.tabbar.autoHide.enabled     "自动隐藏标签栏">
-<!ENTITY config.tabbar.autoShow.caption "自动显示标签栏，当">
-<!ENTITY config.tabbar.autoShow.mousemove "鼠标指针在窗口边缘时">
-<!ENTITY config.tabbar.autoShow.accelKeyDown "按下Control(命令)键片刻之时">
-<!ENTITY config.tabbar.autoShow.tabSwitch   "用Control(命令)-Tab切换标签时">
-<!ENTITY config.tabbar.autoShow.feedback    "打开新标签或关闭其他标签时">
+<!ENTITY config.autoHide.enabled     "自动隐藏标签栏">
+<!ENTITY config.autoShow.caption "自动显示标签栏，当">
+<!ENTITY config.autoShow.mousemove "鼠标指针在窗口边缘时">
+<!ENTITY config.autoHide.area.before "敏感区域:">
+<!ENTITY config.autoHide.area.after "个像素（距离窗口边缘）">
+<!ENTITY config.autoHide.delay.before "延迟:">
+<!ENTITY config.autoHide.delay.after "毫秒">
+<!ENTITY config.autoShow.accelKeyDown "按下Control(命令)键片刻之时">
+<!ENTITY config.autoShow.accelKeyDown.delay.before "Show after">
+<!ENTITY config.autoShow.accelKeyDown.delay.after  "msec.">
+<!ENTITY config.autoShow.tabSwitch   "用Control(命令)-Tab切换标签时">
+<!ENTITY config.autoShow.feedback    "打开新标签或关闭其他标签时">
+<!ENTITY config.autoShow.feedback.delay.before "Hide after">
+<!ENTITY config.autoShow.feedback.delay.after  "msec.">
+
+<!ENTITY config.transparent.style.caption "Background of tab bar">
+<!ENTITY config.transparent.style.0 "Solid">
+<!ENTITY config.transparent.style.1 "Half-transparent">
+<!ENTITY config.transparent.style.2 "Transparent">
 
 
 <!ENTITY config.tabs.advanced "高级">
@@ -93,12 +106,6 @@
 <!ENTITY config.insertNewChildAt.first "插入到子树顶部，成为首个子标签">
 <!ENTITY config.insertNewChildAt.last "添加到子树的最后">
 
-<!ENTITY config.autoHide.caption "自动隐藏标签栏">
-<!ENTITY config.autoHide.area.before "敏感区域:">
-<!ENTITY config.autoHide.area.after "个像素（距离窗口边缘）">
-<!ENTITY config.autoHide.delay.before "延迟:">
-<!ENTITY config.autoHide.delay.after "毫秒">
-