diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index 7b737f4d9cf..034ce0694ad 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -32,6 +32,7 @@ macro_rules! apply_non_ts_list {
             [
                 ("-moz-table-border-nonzero", MozTableBorderNonzero, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("-moz-browser-frame", MozBrowserFrame, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
+                ("-moz-select-list-box", MozSelectListBox, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("link", Link, IN_UNVISITED_STATE, _),
                 ("any-link", AnyLink, IN_VISITED_OR_UNVISITED_STATE, _),
                 ("visited", Visited, IN_VISITED_STATE, _),
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index d6c8e267a3c..7e984dc3ae1 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -2116,6 +2116,9 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
                 bindings::Gecko_IsTableBorderNonzero(self.0)
             },
             NonTSPseudoClass::MozBrowserFrame => unsafe { bindings::Gecko_IsBrowserFrame(self.0) },
+            NonTSPseudoClass::MozSelectListBox => unsafe {
+                bindings::Gecko_IsSelectListBox(self.0)
+            },
             NonTSPseudoClass::MozIsHTML => self.is_html_element_in_html_document(),
             NonTSPseudoClass::MozLWTheme => self.document_theme() != DocumentTheme::Doc_Theme_None,
             NonTSPseudoClass::MozLWThemeBrightText => {
diff --git a/components/style/invalidation/element/element_wrapper.rs b/components/style/invalidation/element/element_wrapper.rs
index 1154c136165..2b6f934c8b7 100644
--- a/components/style/invalidation/element/element_wrapper.rs
+++ b/components/style/invalidation/element/element_wrapper.rs
@@ -239,6 +239,15 @@ where
                 }
             },
 
+            #[cfg(feature = "gecko")]
+            NonTSPseudoClass::MozSelectListBox => {
+                if let Some(snapshot) = self.snapshot() {
+                    if snapshot.has_other_pseudo_class_state() {
+                        return snapshot.mIsSelectListBox();
+                    }
+                }
+            },
+
             // :lang() needs to match using the closest ancestor xml:lang="" or
             // lang="" attribtue from snapshots.
             NonTSPseudoClass::Lang(ref lang_arg) => {
diff --git a/components/style/invalidation/element/invalidation_map.rs b/components/style/invalidation/element/invalidation_map.rs
index 6d9b6c1e85d..ea08bb4f4fb 100644
--- a/components/style/invalidation/element/invalidation_map.rs
+++ b/components/style/invalidation/element/invalidation_map.rs
@@ -506,6 +506,12 @@ impl<'a> SelectorVisitor for SelectorDependencyCollector<'a> {
                     NonTSPseudoClass::MozTableBorderNonzero => local_name!("border"),
                     #[cfg(feature = "gecko")]
                     NonTSPseudoClass::MozBrowserFrame => local_name!("mozbrowser"),
+                    #[cfg(feature = "gecko")]
+                    NonTSPseudoClass::MozSelectListBox => {
+                        // This depends on two attributes.
+                        return self.add_attr_dependency(local_name!("multiple")) &&
+                            self.add_attr_dependency(local_name!("size"));
+                    },
                     NonTSPseudoClass::Lang(..) => local_name!("lang"),
                     _ => return true,
                 };