diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index 6d53dc10b2b..0a7fce46263 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -39,6 +39,7 @@ macro_rules! apply_non_ts_list {
                 ("active", Active, ACTIVE, _),
                 ("autofill", Autofill, AUTOFILL, _),
                 ("checked", Checked, CHECKED, _),
+                ("closed", Closed, CLOSED, _),
                 ("defined", Defined, DEFINED, _),
                 ("disabled", Disabled, DISABLED, _),
                 ("enabled", Enabled, ENABLED, _),
@@ -69,6 +70,7 @@ macro_rules! apply_non_ts_list {
                 ("-moz-math-increment-script-level", MozMathIncrementScriptLevel, INCREMENT_SCRIPT_LEVEL, _),
 
                 ("required", Required, REQUIRED, _),
+                ("open", Open, OPEN, _),
                 ("optional", Optional, OPTIONAL_, _),
                 ("valid", Valid, VALID, _),
                 ("invalid", Invalid, INVALID, _),
diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index 50858549d55..f5998611d7c 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -141,6 +141,9 @@ impl NonTSPseudoClass {
     /// Returns whether the pseudo-class is enabled in content sheets.
     #[inline]
     fn is_enabled_in_content(&self) -> bool {
+        if matches!(*self, Self::Open | Self::Closed) {
+            return static_prefs::pref!("dom.element.popover.enabled");
+        }
         !self.has_any_flag(NonTSPseudoClassFlag::PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME)
     }
 
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index e09fb9e9af0..0e914bc1ff5 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1996,9 +1996,11 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
             NonTSPseudoClass::Enabled |
             NonTSPseudoClass::Disabled |
             NonTSPseudoClass::Checked |
+            NonTSPseudoClass::Closed |
             NonTSPseudoClass::Fullscreen |
             NonTSPseudoClass::Indeterminate |
             NonTSPseudoClass::MozInert |
+            NonTSPseudoClass::Open |
             NonTSPseudoClass::PlaceholderShown |
             NonTSPseudoClass::Target |
             NonTSPseudoClass::Valid |