diff --git a/dom/tests/mochitest/general/test_interfaces.js b/dom/tests/mochitest/general/test_interfaces.js
index 2617852295bf..17bdcac155ff 100644
--- a/dom/tests/mochitest/general/test_interfaces.js
+++ b/dom/tests/mochitest/general/test_interfaces.js
@@ -825,7 +825,7 @@ var interfaceNamesInGlobalScope =
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ScrollAreaEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    "SecurityPolicyViolationEvent",
+    {name: "SecurityPolicyViolationEvent", release: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Selection",
 // IMPORTANT: Do not change this list without review from a DOM peer!
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 0682b7b41b72..dcc54e6e6227 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2559,7 +2559,7 @@ pref("security.notification_enable_delay", 500);
 pref("security.csp.enable", true);
 pref("security.csp.experimentalEnabled", false);
 pref("security.csp.enableStrictDynamic", true);
-#ifdef EARLY_BETA_OR_EARLIER
+#ifdef NIGHTLY_BUILD
 pref("security.csp.enable_violation_events", true);
 #else
 pref("security.csp.enable_violation_events", false);
diff --git a/testing/web-platform/meta/content-security-policy/style-src/style-src-imported-style-blocked.html.ini b/testing/web-platform/meta/content-security-policy/style-src/style-src-imported-style-blocked.html.ini
index c8e6f60704a1..3634c5dd67f1 100644
--- a/testing/web-platform/meta/content-security-policy/style-src/style-src-imported-style-blocked.html.ini
+++ b/testing/web-platform/meta/content-security-policy/style-src/style-src-imported-style-blocked.html.ini
@@ -1,5 +1,6 @@
 [style-src-imported-style-blocked.html]
   type: testharness
+  prefs: [security.csp.enable_violation_events:true]
   [Should fire a securitypolicyviolation event]
     expected: FAIL