diff --git a/Optional-Hardening.md b/Optional-Hardening.md
index f1ffe7b..2dfc636 100644
--- a/Optional-Hardening.md
+++ b/Optional-Hardening.md
@@ -116,6 +116,17 @@ user_pref("default-browser-agent.enabled", false);
 
 ***
 
+### Require Safe Negotiation
+
+Some sites, like `EA.com`, will not let you login due to their weak encryption.
+
+```
+// PREF: require safe SSL negotiation
+user_pref("security.ssl.require_safe_negotiation", true);
+```
+
+***
+
 ### Cross-origin referer
 Do not send a [referer](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referer) when navigating to a different site (e.g., `google.com` → `facebook.com`).