diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index c789df48533d..01e52d8f8a2a 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -3041,7 +3041,7 @@
 # is set to true then this pref has no effect)
 - name: dom.security.https_first_pbm
   type: RelaxedAtomicBool
-  value: false
+  value: @IS_NIGHTLY_BUILD@
   mirror: always
 
 - name: dom.security.unexpected_system_load_telemetry_enabled