diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index e50e60b30cb5..4c0484031d51 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -1136,7 +1136,7 @@ pref("network.http.bypass-cachelock-threshold", 250);
 pref("network.http.spdy.enabled", true);
 pref("network.http.spdy.enabled.v3", true);
 pref("network.http.spdy.enabled.v3-1", true);
-pref("network.http.spdy.enabled.http2draft", true);
+pref("network.http.spdy.enabled.http2draft", false);
 pref("network.http.spdy.enforce-tls-profile", true);
 pref("network.http.spdy.chunk-size", 16000);
 pref("network.http.spdy.timeout", 180);
diff --git a/netwerk/base/public/security-prefs.js b/netwerk/base/public/security-prefs.js
index 352552e99a9c..d754a0ab2d03 100644
--- a/netwerk/base/public/security-prefs.js
+++ b/netwerk/base/public/security-prefs.js
@@ -15,7 +15,7 @@ pref("security.ssl.enable_false_start", true);
 pref("security.ssl.false_start.require-npn", true);
 pref("security.ssl.false_start.require-forward-secrecy", true);
 pref("security.ssl.enable_npn", true);
-pref("security.ssl.enable_alpn", true);
+pref("security.ssl.enable_alpn", false);
 
 pref("security.ssl3.ecdhe_rsa_aes_128_gcm_sha256", true);
 pref("security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256", true);