diff --git a/skin/classic/treestyletab/base.css b/skin/classic/treestyletab/base.css
index 10a27eff..882848c4 100644
--- a/skin/classic/treestyletab/base.css
+++ b/skin/classic/treestyletab/base.css
@@ -16,7 +16,7 @@
 	border-radius: 0;
 	-moz-border-radius: 0;
 	border-top: 1px solid ThreeDShadow !important;
-	background: ThreeDFace !important;
+	background: Window !important;
 }
 .tabbrowser-tabs[treestyletab-mode="vertical"] .tabs-newtab-button:hover,
 .treestyletab-tabbar-toolbar[treestyletab-mode="vertical"] > toolbarbutton:hover {
diff --git a/skin/classic/treestyletab/square/base.css b/skin/classic/treestyletab/square/base.css
index d80aba8f..a7c0ce2d 100644
--- a/skin/classic/treestyletab/square/base.css
+++ b/skin/classic/treestyletab/square/base.css
@@ -85,7 +85,7 @@
   .tabbrowser-tab:not([pinned]),
 .tabbrowser-tabs:not([treestyletab-tabbar-position="top"])
   .tabbrowser-tab:not([pinned]):not([selected="true"]) {
-	background: ThreeDFace repeat-x !important;
+	background: Window repeat-x !important;
 }
 .tabbrowser-tabs:not([treestyletab-tabbar-position="top"])
   :-moz-any(.tabbrowser-tab[pinned]:not([titlechanged]),
@@ -96,7 +96,7 @@
   .tabbrowser-tabs:not([treestyletab-tabbar-position="top"])
   :-moz-any(.tabbrowser-tab[pinned],
             .tabbrowser-tab[pinned][titlechanged]) {
-	background: ThreeDFace repeat-x !important;
+	background: Window repeat-x !important;
 }
 .tabbrowser-tabs[treestyletab-mode="vertical"][treestyletab-firsttab-border="true"]
   .tabbrowser-tab:not([pinned="true"]):not([selected="true"]):first-child {
diff --git a/skin/classic/treestyletab/square/tab-surface.css b/skin/classic/treestyletab/square/tab-surface.css
index 26457ff6..11973254 100644
--- a/skin/classic/treestyletab/square/tab-surface.css
+++ b/skin/classic/treestyletab/square/tab-surface.css
@@ -13,7 +13,7 @@
   .tabbrowser-tab
   :-moz-any(.tab-background:not([pinned]),
             .tab-background:not([titlechanged])[pinned]) {
-	background-color: ThreeDFace !important;
+	background-color: Window !important;
 	background-image: -moz-linear-gradient(
 	                    top, 
 	                    rgba(0, 0, 0, 0.02) 0,
diff --git a/skin/classic/treestyletab/square/vertigo.css b/skin/classic/treestyletab/square/vertigo.css
index d3541a23..503d2393 100644
--- a/skin/classic/treestyletab/square/vertigo.css
+++ b/skin/classic/treestyletab/square/vertigo.css
@@ -90,6 +90,6 @@
 /* autohide */
 .treestyletab-tabbar-toolbar[treestyletab-tabbar-autohide][treestyletab-mode="vertical"]
   #treestyletab-tabbar-resizer-box {
-	background: ThreeDFace;
+	background: Window;
 	opacity: 0.75;
 }
diff --git a/skin/classic/treestyletab/tmp.css b/skin/classic/treestyletab/tmp.css
index 7969eb5e..b82418ab 100644
--- a/skin/classic/treestyletab/tmp.css
+++ b/skin/classic/treestyletab/tmp.css
@@ -10,7 +10,7 @@
 	-moz-border-bottom-colors: none !important;
 	-moz-border-left-colors: none !important;
 	border-top: 1px solid ThreeDShadow !important;
-	background: ThreeDFace !important;
+	background: Window !important;
 }
 
 :root[treestyletab-enable-compatibility-tmp="true"]