diff --git a/toolkit/modules/AppConstants.jsm b/toolkit/modules/AppConstants.jsm
index 0cfebfafb5c3..e87507a7efd2 100644
--- a/toolkit/modules/AppConstants.jsm
+++ b/toolkit/modules/AppConstants.jsm
@@ -358,13 +358,6 @@ this.AppConstants = Object.freeze({
     false,
 #endif
 
-  MOZ_PHOTON_PREFERENCES:
-#ifdef MOZ_PHOTON_PREFERENCES
-    true,
-#else
-    false,
-#endif
-
   MOZ_STYLO:
 #ifdef MOZ_STYLO
     true,
diff --git a/toolkit/moz.configure b/toolkit/moz.configure
index 803162373e3b..37d57907756b 100644
--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -510,18 +510,6 @@ project_flag('MOZ_ALLOW_LEGACY_EXTENSIONS',
              help='Allow legacy browser extensions',
              default=True, set_as_define=True)
 
-option(env='MOZ_PHOTON_PREFERENCES',
-       help='Enable Photon preferences',
-       default=milestone.is_nightly)
-
-@depends('MOZ_PHOTON_PREFERENCES')
-def photon_preferences(value):
-    if value:
-        return bool(value)
-
-set_config('MOZ_PHOTON_PREFERENCES', photon_preferences)
-set_define('MOZ_PHOTON_PREFERENCES', photon_preferences)
-
 @depends('MOZ_PLACES', 'MOZ_ANDROID_HISTORY')
 def check_places_and_android_history(places, android_history):
     if places and android_history: