diff --git a/user.js b/user.js
index 5dbcac2..ed07ee9 100644
--- a/user.js
+++ b/user.js
@@ -45,6 +45,7 @@ user_pref("browser.download.useDownloadDir", false);
 user_pref("browser.helperApps.deleteTempFileOnExit", true);
 
 // Experiments
+user_pref("browser.preferences.experimental.hidden", true);
 user_pref("messaging-system.rsexperimentloader.collection_id", "");
 user_pref("nimbus.profilesdatastoreservice.enabled", false);
 user_pref("nimbus.profileId", "");