diff --git a/skin/classic/treestyletab/base.css b/skin/classic/treestyletab/base.css
index 41642919..0e193f4a 100644
--- a/skin/classic/treestyletab/base.css
+++ b/skin/classic/treestyletab/base.css
@@ -38,6 +38,10 @@
 	margin: 0 !important;
 	padding: 0 !important;
 }
+.tabbrowser-tabs:not([treestyletab-tabbar-position="top"]) .arrowscrollbox-scrollbox {
+	margin: 0 !important;
+	padding: 0 !important;
+}
 
 /* Support customizable tab bar on Firefox 4.0 or later */
 #TabsToolbar[treestyletab-mode="vertical"] > toolbarpaletteitem > toolbarbutton {
diff --git a/skin/classic/treestyletab/metal/base.css b/skin/classic/treestyletab/metal/base.css
index 741b4ce1..f6e93994 100644
--- a/skin/classic/treestyletab/metal/base.css
+++ b/skin/classic/treestyletab/metal/base.css
@@ -3,8 +3,7 @@
 /* tab bar */
 
 #TabsToolbar[treestyletab-style~="metal"]:not([treestyletab-tabbar-position="top"]),
-#TabsToolbar[treestyletab-style~="metal"][treestyletab-tabbar-position="top"]:not([treestyletab-tabbar-fixed="true"]),
-.tabbrowser-tabs[treestyletab-style~="metal"]:not([treestyletab-tabbar-position="top"]) .arrowscrollbox-scrollbox {
+#TabsToolbar[treestyletab-style~="metal"][treestyletab-tabbar-position="top"]:not([treestyletab-tabbar-fixed="true"]) {
 	background: transparent !important;
 	border: 0 none !important;
 	margin: 0 !important;
diff --git a/skin/classic/treestyletab/sidebar/base.css b/skin/classic/treestyletab/sidebar/base.css
index 0e338245..853babea 100644
--- a/skin/classic/treestyletab/sidebar/base.css
+++ b/skin/classic/treestyletab/sidebar/base.css
@@ -246,8 +246,7 @@ tabbrowser[treestyletab-style~="sidebar"][treestyletab-mode="vertical"]
 /* changed from original SidebarStyleTab */
 
 #TabsToolbar[treestyletab-style~="sidebar"]:not([treestyletab-tabbar-position="top"]),
-#TabsToolbar[treestyletab-style~="sidebar"][treestyletab-tabbar-position="top"]:not([treestyletab-tabbar-fixed="true"]),
-.tabbrowser-tabs[treestyletab-style~="sidebar"]:not([treestyletab-tabbar-position="top"]) .arrowscrollbox-scrollbox {
+#TabsToolbar[treestyletab-style~="sidebar"][treestyletab-tabbar-position="top"]:not([treestyletab-tabbar-fixed="true"]) {
 	background: transparent !important;
 	border: 0 none !important;
 	margin: 0 !important;
diff --git a/skin/classic/treestyletab/square/square.css b/skin/classic/treestyletab/square/square.css
index ba541250..800a51d0 100644
--- a/skin/classic/treestyletab/square/square.css
+++ b/skin/classic/treestyletab/square/square.css
@@ -3,8 +3,7 @@
 /* Default style */
 
 .tabbrowser-tabs[treestyletab-style~="square"]:not([treestyletab-tabbar-position="top"]),
-#TabsToolbar[treestyletab-style~="square"]:not([treestyletab-tabbar-position="top"]),
-.tabbrowser-tabs[treestyletab-style~="square"]:not([treestyletab-tabbar-position="top"]) .arrowscrollbox-scrollbox {
+#TabsToolbar[treestyletab-style~="square"]:not([treestyletab-tabbar-position="top"]) {
 	background: transparent !important;
 	margin: 0 !important;
 	padding: 0 !important;