diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index 317cbfb83fe..14a74d3e570 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -90,9 +90,9 @@ macro_rules! apply_non_ts_list {
                 ("-moz-use-shadow-tree-root", MozUseShadowTreeRoot, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("-moz-is-html", MozIsHTML, _, _),
                 ("-moz-placeholder", MozPlaceholder, _, _),
-                ("-moz-lwtheme", MozLWTheme, _, _),
-                ("-moz-lwtheme-brighttext", MozLWThemeBrightText, _, _),
-                ("-moz-lwtheme-darktext", MozLWThemeDarkText, _, _),
+                ("-moz-lwtheme", MozLWTheme, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
+                ("-moz-lwtheme-brighttext", MozLWThemeBrightText, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
+                ("-moz-lwtheme-darktext", MozLWThemeDarkText, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
                 ("-moz-window-inactive", MozWindowInactive, _, _),
             ]
         }
diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index 751a38d8465..f13df17a986 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -127,7 +127,7 @@ impl NonTSPseudoClass {
             ([$(($css:expr, $name:ident, $state:tt, $flags:tt),)*]) => {
                 match *self {
                     $(NonTSPseudoClass::$name => check_flag!($flags),)*
-                    NonTSPseudoClass::MozLocaleDir(_) |
+                    NonTSPseudoClass::MozLocaleDir(_) => check_flag!(PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
                     NonTSPseudoClass::Lang(_) |
                     NonTSPseudoClass::Dir(_) => false,
                 }
@@ -145,6 +145,12 @@ impl NonTSPseudoClass {
         if let NonTSPseudoClass::MozSubmitInvalid = *self {
             return static_prefs::pref!("layout.css.moz-submit-invalid.enabled");
         }
+        if matches!(*self, Self::MozLWTheme | Self::MozLWThemeBrightText | Self::MozLWThemeDarkText) {
+            return static_prefs::pref!("layout.css.moz-lwtheme.content.enabled");
+        }
+        if let NonTSPseudoClass::MozLocaleDir(..) = *self {
+            return static_prefs::pref!("layout.css.moz-locale-dir.content.enabled");
+        }
         !self.has_any_flag(NonTSPseudoClassFlag::PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME)
     }