diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 127adce..297a1d6 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -6515,19 +6515,6 @@
     }
   }
 }
-@supports -moz-bool-pref("userChrome.sidebar.hidden_header") {
-  @supports not -moz-bool-pref("userChrome.sidebar.hidden_header.vertical_tab_only") {
-    #sidebar-header {
-      display: none !important;
-    }
-  }
-  @supports -moz-bool-pref("userChrome.sidebar.hidden_header.vertical_tab_only") {
-    #sidebar-box:is([sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"], [sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"], [sidebarcommand="sidebartabs_asamuzak_jp-sidebar-action"])
-      #sidebar-header {
-      display: none !important;
-    }
-  }
-}
 /** Other UI ******************************************************************/
 /*= Bookmark Bar - Centered ==================================================*/
 @supports -moz-bool-pref("userChrome.bookmarkbar.centered") {
@@ -7237,6 +7224,19 @@
     }
   }
 }
+@supports -moz-bool-pref("userChrome.hidden.sidebar_header") {
+  @supports not -moz-bool-pref("userChrome.hidden.sidebar_header.vertical_tab_only") {
+    #sidebar-header {
+      display: none !important;
+    }
+  }
+  @supports -moz-bool-pref("userChrome.hidden.sidebar_header.vertical_tab_only") {
+    #sidebar-box:is([sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"], [sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"], [sidebarcommand="sidebartabs_asamuzak_jp-sidebar-action"])
+      #sidebar-header {
+      display: none !important;
+    }
+  }
+}
 @supports -moz-bool-pref("userChrome.hidden.urlbar_iconbox") {
   #identity-box[pageproxystate="valid"]
     #identity-box[pageproxystate="valid"]
diff --git a/src/hidden/_index.scss b/src/hidden/_index.scss
index a9bef35..8cf4830 100644
--- a/src/hidden/_index.scss
+++ b/src/hidden/_index.scss
@@ -12,6 +12,24 @@
   }
 }
 
+@include Option("userChrome.hidden.sidebar_header") {
+  @include NotOption("userChrome.hidden.sidebar_header.vertical_tab_only") {
+    #sidebar-header {
+      display: none !important;
+    }
+  }
+
+  @include Option("userChrome.hidden.sidebar_header.vertical_tab_only") {
+    #sidebar-box:is(
+      [sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"],
+      [sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"],
+      [sidebarcommand="sidebartabs_asamuzak_jp-sidebar-action"]
+    ) #sidebar-header {
+      display: none !important;
+    }
+  }
+}
+
 @include Option("userChrome.hidden.urlbar_iconbox") {
   #identity-box[pageproxystate="valid"]
   #identity-box[pageproxystate="valid"]
diff --git a/src/sidebar/_hidden.scss b/src/sidebar/_hidden.scss
deleted file mode 100644
index be69a27..0000000
--- a/src/sidebar/_hidden.scss
+++ /dev/null
@@ -1,15 +0,0 @@
-@include NotOption("userChrome.sidebar.hidden_header.vertical_tab_only") {
-  #sidebar-header {
-    display: none !important;
-  }
-}
-
-@include Option("userChrome.sidebar.hidden_header.vertical_tab_only") {
-  #sidebar-box:is(
-    [sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"],
-    [sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"],
-    [sidebarcommand="sidebartabs_asamuzak_jp-sidebar-action"]
-  ) #sidebar-header {
-    display: none !important;
-  }
-}
diff --git a/src/sidebar/_index.scss b/src/sidebar/_index.scss
index 27c61d0..adf19ab 100644
--- a/src/sidebar/_index.scss
+++ b/src/sidebar/_index.scss
@@ -1,5 +1 @@
 @import "overlap";
-
-@include Option("userChrome.sidebar.hidden_header") {
-  @import "hidden";
-}
diff --git a/user.js b/user.js
index 7409dcc..31c0823 100644
--- a/user.js
+++ b/user.js
@@ -87,6 +87,8 @@ user_pref("userChrome.rounding.square_tab",           false);
 
 // user_pref("userChrome.hidden.tabbar",                       true);
 // user_pref("userChrome.hidden.navbar",                       true);
+// user_pref("userChrome.hidden.sidebar_header",               true);
+// user_pref("userChrome.hidden.sidebar_header.vertical_tab_only", true);
 // user_pref("userChrome.hidden.urlbar_iconbox",               true);
 // user_pref("userChrome.hidden.selected_tab",                 true);
 // user_pref("userChrome.hidden.disabled_menu",                true);
@@ -137,8 +139,6 @@ user_pref("userChrome.rounding.square_tab",           false);
 // user_pref("userChrome.panel.full_width_separator",          true);
 // user_pref("userChrome.panel.full_width_padding",            true);
 
-// user_pref("userChrome.sidebar.hidden_header",               true);
-// user_pref("userChrome.sidebar.hidden_header.vertical_tab_only", true);
 // user_pref("userChrome.sidebar.overlap",                     true);
 
 // user_pref("userChrome.icon.account_image_to_right",         true);