From a85a5d665ed160ced9b18c61a6b1dcdc7917a096 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nikolaj=20=C5=A0ujskij?=
 <419654+skrattaren@users.noreply.github.com>
Date: Tue, 10 Mar 2026 19:00:58 +0400
Subject: [PATCH] Add "Hide 'New tab' button when vertical tabs are enabled"
 style (#609)

* Add "Hide 'New tab' button when vertical tabs are enabled"

* hide vert new tab button: fix for the scrollable sidebar case
---
 chrome/hide_vert_new_tab_button.css | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 chrome/hide_vert_new_tab_button.css

diff --git a/chrome/hide_vert_new_tab_button.css b/chrome/hide_vert_new_tab_button.css
new file mode 100644
index 0000000..9c7ea92
--- /dev/null
+++ b/chrome/hide_vert_new_tab_button.css
@@ -0,0 +1,9 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/hide_vert_new_tab_button.css made available under Mozilla Public License v. 2.0
+See the above repository for updates as well as full license text. */
+
+/* This style hides "New tab" button *when vertical tabs are enabled*
+ * (https://support.mozilla.org/en-US/kb/use-sidebar-access-tools-and-vertical-tabs#w_turn-on-vertical-tabs)
+*/
+#tabbrowser-tabs[orient="vertical"] :is(#tabs-newtab-button, #vertical-tabs-newtab-button){
+  display: none;
+}