diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 50733da5c0..fa9406be5b 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1553,7 +1553,7 @@ pref("network.http.bypass-cachelock-threshold", 250);
 pref("network.http.spdy.enabled", true);
 pref("network.http.spdy.enabled.http2", true);
 pref("network.http.spdy.enabled.deps", true);
-pref("network.http.spdy.enforce-tls-profile", true);
+pref("network.http.spdy.enforce-tls-profile", false);
 pref("network.http.spdy.chunk-size", 16000);
 pref("network.http.spdy.timeout", 180);
 pref("network.http.spdy.coalesce-hostnames", true);