diff --git a/content/treestyletab/res/tabFx2Compatible.css b/content/treestyletab/res/tabFx2Compatible.css
index 686fd311..8b412ecd 100644
--- a/content/treestyletab/res/tabFx2Compatible.css
+++ b/content/treestyletab/res/tabFx2Compatible.css
@@ -92,3 +92,10 @@
   .tabbrowser-tab[pinned="true"] .tab-text {
 	visibility: collapse !important;
 }
+
+:root[tabFx2Compatible="7"]
+  .tabbrowser-tab[pinned="true"] > .tab-image-left,
+:root[tabFx2Compatible="7"]
+  .tabbrowser-tab[pinned="true"] > .tab-image-right {
+	display: none !important;
+}
diff --git a/skin/classic/treestyletab/metal/tab-3.5.css b/skin/classic/treestyletab/metal/tab-3.5.css
index e9a5022b..32813ef4 100644
--- a/skin/classic/treestyletab/metal/tab-3.5.css
+++ b/skin/classic/treestyletab/metal/tab-3.5.css
@@ -167,15 +167,6 @@
 
 /* pinned tabs */
 
-.tabbrowser-tabs[treestyletab-style="metal"][treestyletab-mode="vertical"]
-  .tabbrowser-tab[pinned="true"] >
-  .tab-image-left,
-.tabbrowser-tabs[treestyletab-style="metal"][treestyletab-mode="vertical"]
-  .tabbrowser-tab[pinned="true"] >
-  .tab-image-right {
-	display: none !important;
-}
-
 .tabbrowser-tabs[treestyletab-style="metal"][treestyletab-mode="vertical"]
   .tabbrowser-tab[pinned="true"] >
   .tab-image-middle,