diff --git a/conf/firefox-forbidden-policies.js b/conf/firefox-forbidden-policies.js
index def695a5..1780bd7e 100644
--- a/conf/firefox-forbidden-policies.js
+++ b/conf/firefox-forbidden-policies.js
@@ -90,7 +90,7 @@ lockPref("toolkit.telemetry.dap_enabled", true);
 
 // New sidebar
 lockPref("sidebar.revamp", true);
-lockPref("sidebar.verticalTabs", true);
+defaultPref("sidebar.verticalTabs", true);
 lockPref("sidebar.position_start", false);
 lockPref("sidebar.visibility", "always-show");