From 5feef90401a439106e0c526bbee51a70345fea33 Mon Sep 17 00:00:00 2001
From: "Mr. M" <mr.m@tuta.com>
Date: Mon, 25 Aug 2025 10:09:46 +0200
Subject: [PATCH] fix: Fixed chrome.xhtml not rendering on tabs, b=closes
 #9989, c=common

---
 src/zen/common/ZenUIManager.mjs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/zen/common/ZenUIManager.mjs b/src/zen/common/ZenUIManager.mjs
index 2b2834b94..002c3a95e 100644
--- a/src/zen/common/ZenUIManager.mjs
+++ b/src/zen/common/ZenUIManager.mjs
@@ -531,8 +531,8 @@ var gZenVerticalTabsManager = {
 
     ChromeUtils.defineLazyGetter(this, 'hidesTabsToolbar', () => {
       return (
-        document.documentElement.getAttribute('chromehidden').includes('toolbar') ||
-        document.documentElement.getAttribute('chromehidden').includes('menubar')
+        document.documentElement.getAttribute('chromehidden')?.includes('toolbar') ||
+        document.documentElement.getAttribute('chromehidden')?.includes('menubar')
       );
     });