--- a/netwerk/base/security-prefs.js
+++ b/netwerk/base/security-prefs.js
@@ -2,17 +2,22 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 pref("security.tls.version.min", 1);
 pref("security.tls.version.max", 3);
 pref("security.tls.version.fallback-limit", 3);
 pref("security.tls.insecure_fallback_hosts", "");
 pref("security.tls.insecure_fallback_hosts.use_static_list", true);
+
+#if defined(NIGHTLY_BUILD) || defined(MOZ_DEV_EDITION)
 pref("security.tls.unrestricted_rc4_fallback", false);
+#else
+pref("security.tls.unrestricted_rc4_fallback", true);
+#endif
 
 pref("security.ssl.treat_unsafe_negotiation_as_broken", false);
 pref("security.ssl.require_safe_negotiation",  false);
 pref("security.ssl.warn_missing_rfc5746",  1);
 pref("security.ssl.enable_ocsp_stapling", true);
 pref("security.ssl.enable_false_start", true);
 pref("security.ssl.false_start.require-npn", false);
 pref("security.ssl.enable_npn", true);