diff --git a/components/style/element_state.rs b/components/style/element_state.rs
index cdce4d3cc75..ebf6aa42a69 100644
--- a/components/style/element_state.rs
+++ b/components/style/element_state.rs
@@ -53,8 +53,6 @@ bitflags! {
         const IN_MOZ_UI_INVALID_STATE = 1 << 13;
         /// Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-broken
         const IN_BROKEN_STATE = 1 << 14;
-        /// Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-suppressed
-        const IN_SUPPRESSED_STATE = 1 << 16;
         /// Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-loading
         const IN_LOADING_STATE = 1 << 17;
         /// Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-handler-blocked
diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index 030452a6c0a..77ff53ed3a3 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -58,7 +58,6 @@ macro_rules! apply_non_ts_list {
                 ("-moz-focusring", MozFocusRing, IN_FOCUSRING_STATE, _),
                 ("-moz-broken", MozBroken, IN_BROKEN_STATE, _),
                 ("-moz-loading", MozLoading, IN_LOADING_STATE, _),
-                ("-moz-suppressed", MozSuppressed, IN_SUPPRESSED_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME),
                 ("-moz-has-dir-attr", MozHasDirAttr, IN_HAS_DIR_ATTR_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("-moz-dir-attr-ltr", MozDirAttrLTR, IN_HAS_DIR_ATTR_LTR_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
                 ("-moz-dir-attr-rtl", MozDirAttrRTL, IN_HAS_DIR_ATTR_RTL_STATE, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 8b93ed744c5..932685ea3c1 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -2029,7 +2029,6 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
             NonTSPseudoClass::Invalid |
             NonTSPseudoClass::MozUIValid |
             NonTSPseudoClass::MozBroken |
-            NonTSPseudoClass::MozSuppressed |
             NonTSPseudoClass::MozLoading |
             NonTSPseudoClass::MozHandlerBlocked |
             NonTSPseudoClass::MozHandlerDisabled |