diff --git a/chrome/bookmarksbar_on_new_tabs_only.css b/chrome/bookmarksbar_on_new_tabs_only.css
index 787f7ff..108ea1a 100644
--- a/chrome/bookmarksbar_on_new_tabs_only.css
+++ b/chrome/bookmarksbar_on_new_tabs_only.css
@@ -1,3 +1,6 @@
+/* This stylesheet is deprecated since Firefox 72 */
+/* Use autohide_bookmarks_toolbar.css instead */
+
 :root[title$=" - Mozilla Firefox"] #PersonalToolbar,
 :root[title$=" - Mozilla Firefox (Private Browsing)"] #PersonalToolbar,
 :root[title$=" - Firefox Nightly"] #PersonalToolbar,