diff --git a/user.js b/user.js
index 3055995..d942fcc 100644
--- a/user.js
+++ b/user.js
@@ -174,6 +174,7 @@ user_pref("browser.contentblocking.report.lockwise.enabled", false);
 user_pref("browser.contentblocking.report.monitor.enabled", false);
 user_pref("browser.startup.homepage", "about:home");
 user_pref("browser.toolbars.bookmarks.visibility", "never");
+user_pref("browser.xul.error_pages.expert_bad_cert", true);
 user_pref("browser.uitour.enabled", false);
 user_pref("browser.urlbar.showSearchSuggestionsFirst", false);
 user_pref("devtools.debugger.remote-enabled", false);