diff --git a/modules/themes/alucard/config/firefox/userChrome.css b/modules/themes/alucard/config/firefox/userChrome.css
index ff131bd9..e4c9f492 100644
--- a/modules/themes/alucard/config/firefox/userChrome.css
+++ b/modules/themes/alucard/config/firefox/userChrome.css
@@ -6,13 +6,17 @@
   /*** TREE STYLE TABS ***/
   /* Hide main tabs toolbar */
   #TabsToolbar {
-  	visibility: collapse;
+  	visibility: collapse !important;
   }
   /* Sidebar min and max width removal */
   #sidebar {
   	max-width: none !important;
   	min-width: 0px !important;
   }
+  /* hide sidebar header */
+  #sidebar-header {
+	display: none;
+  }
   /* Hide splitter, when using Tree Style Tab. */
   #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] + #sidebar-splitter {
   	display: none !important;