diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index 497c806545c..c9f711cb711 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -60,8 +60,7 @@ macro_rules! apply_non_ts_list {
                 ("target", Target, target, IN_TARGET_STATE, _),
                 ("indeterminate", Indeterminate, indeterminate, IN_INDETERMINATE_STATE, _),
                 ("-moz-devtools-highlighted", MozDevtoolsHighlighted, mozDevtoolsHighlighted, IN_DEVTOOLS_HIGHLIGHTED_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
-                // FIXME(emilio): Unship this for content docs (bug 1396073).
-                ("-moz-styleeditor-transitioning", MozStyleeditorTransitioning, mozStyleeditorTransitioning, IN_STYLEEDITOR_TRANSITIONING_STATE, _),
+                ("-moz-styleeditor-transitioning", MozStyleeditorTransitioning, mozStyleeditorTransitioning, IN_STYLEEDITOR_TRANSITIONING_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("fullscreen", Fullscreen, fullscreen, IN_FULLSCREEN_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
                 ("-moz-full-screen", MozFullScreen, mozFullScreen, IN_FULLSCREEN_STATE, _),
                 // TODO(emilio): This is inconsistently named (the capital R).