--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -511,17 +511,17 @@ def photon_animations(value):
     if value:
         return bool(value)
 
 set_config('MOZ_PHOTON_ANIMATIONS', photon_animations)
 set_define('MOZ_PHOTON_ANIMATIONS', photon_animations)
 
 option(env='MOZ_PHOTON_PREFERENCES',
        help='Enable Photon preferences',
-       default=milestone.is_nightly)
+       default=False)
 
 @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)