diff --git a/user.js b/user.js
index e6a4ccf..cd665d5 100644
--- a/user.js
+++ b/user.js
@@ -147,6 +147,7 @@ user_pref("lightweightThemes.getMoreURL", "");
 
 // Telemetry
 user_pref("browser.ping-centre.telemetry", false);
+user_pref("browser.tabs.warnOnClose", true);
 user_pref("browser.urlbar.eventTelemetry.enabled", false);
 user_pref("dom.security.unexpected_system_load_telemetry_enabled", false);
 user_pref("network.trr.confirmation_telemetry_enabled", false);