diff --git a/components/style/properties/longhand/ui.mako.rs b/components/style/properties/longhand/ui.mako.rs
index 683a8967ea3..13a940b2b96 100644
--- a/components/style/properties/longhand/ui.mako.rs
+++ b/components/style/properties/longhand/ui.mako.rs
@@ -41,13 +41,17 @@ ${helpers.single_keyword("-moz-window-shadow", "none default menu tooltip sheet"
                          enabled_in="chrome",
                          spec="None (Nonstandard internal property)")}
 
-// TODO(bug 1419695) This should be hidden from content.
-${helpers.predefined_type("-moz-window-opacity", "Opacity", "1.0", products="gecko",
-                          gecko_ffi_name="mWindowOpacity",
-                          animation_value_type="ComputedValue",
-                          spec="None (Nonstandard internal property)")}
+${helpers.predefined_type(
+    "-moz-window-opacity",
+    "Opacity",
+    "1.0",
+    products="gecko",
+    gecko_ffi_name="mWindowOpacity",
+    animation_value_type="ComputedValue",
+    spec="None (Nonstandard internal property)",
+    enabled_in="chrome",
+)}
 
-// TODO(bug 1419695) This should be hidden from content.
 ${helpers.predefined_type(
     "-moz-window-transform",
     "Transform",
@@ -56,10 +60,10 @@ ${helpers.predefined_type(
     gecko_ffi_name="mSpecifiedWindowTransform",
     flags="GETCS_NEEDS_LAYOUT_FLUSH",
     animation_value_type="ComputedValue",
-    spec="None (Nonstandard internal property)"
+    spec="None (Nonstandard internal property)",
+    enabled_in="chrome",
 )}
 
-// TODO(bug 1419695) This should be hidden from content.
 ${helpers.predefined_type(
     "-moz-window-transform-origin",
     "TransformOrigin",
@@ -69,7 +73,8 @@ ${helpers.predefined_type(
     products="gecko",
     boxed=True,
     flags="GETCS_NEEDS_LAYOUT_FLUSH",
-    spec="None (Nonstandard internal property)"
+    spec="None (Nonstandard internal property)",
+    enabled_in="chrome",
 )}
 
 // TODO(emilio): Probably also should be hidden from content.