Bug 1730935 - Disable Opportunistic Encryption, the feature has a low usage. r=kershaw,necko-reviewers,valentin

Differential Revision: https://phabricator.services.mozilla.com/D127426

modules/libpref/init/all.js

@@ -1448,7 +1448,7 @@ pref("network.http.http3.alt-svc-mapping-for-testing", "");
 // alt-svc allows separation of transport routing from
 // the origin host without using a proxy.
 pref("network.http.altsvc.enabled", true);
-pref("network.http.altsvc.oe", true);
+pref("network.http.altsvc.oe", false);
 
 // Turn on 0RTT data for TLS 1.3
 pref("security.tls.enable_0rtt_data", true);

netwerk/test/unit/test_http3.js

@@ -76,6 +76,7 @@ function run_test() {
   // We always resolve elements of localDomains as it's hardcoded without the
   // following pref:
   prefs.setBoolPref("network.proxy.allow_hijacking_localhost", true);
+  prefs.setBoolPref("network.http.altsvc.oe", true);
 
   // The certificate for the http3server server is for foo.example.com and
   // is signed by http2-ca.pem so add that cert to the trust list as a
@@ -564,6 +565,7 @@ function testsDone() {
   prefs.clearUserPref("network.http.http3.enabled");
   prefs.clearUserPref("network.dns.localDomains");
   prefs.clearUserPref("network.proxy.allow_hijacking_localhost");
+  prefs.clearUserPref("network.http.altsvc.oe");
   dump("testDone\n");
   do_test_pending();
   h1Server.stop(do_test_finished);