diff --git a/components/style/element_state.rs b/components/style/element_state.rs
index 30c65dc9feb..28d505129a1 100644
--- a/components/style/element_state.rs
+++ b/components/style/element_state.rs
@@ -148,9 +148,5 @@ bitflags! {
         const LTR_LOCALE = 1 << 2;
         /// LWTheme status
         const LWTHEME = 1 << 3;
-        /// LWTheme status
-        const LWTHEME_BRIGHTTEXT = 1 << 4;
-        /// LWTheme status
-        const LWTHEME_DARKTEXT = 1 << 5;
     }
 }
diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index feb28feb0df..7d6190ba47c 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -92,8 +92,6 @@ macro_rules! apply_non_ts_list {
                 ("-moz-is-html", MozIsHTML, _, _),
                 ("-moz-placeholder", MozPlaceholder, _, _),
                 ("-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 8fc0900aece..8a3224938b9 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -139,12 +139,6 @@ impl NonTSPseudoClass {
     /// Returns whether the pseudo-class is enabled in content sheets.
     #[inline]
     fn is_enabled_in_content(&self) -> bool {
-        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");
         }
@@ -184,8 +178,6 @@ impl NonTSPseudoClass {
             },
             NonTSPseudoClass::MozWindowInactive => DocumentState::WINDOW_INACTIVE,
             NonTSPseudoClass::MozLWTheme => DocumentState::LWTHEME,
-            NonTSPseudoClass::MozLWThemeBrightText => DocumentState::LWTHEME_BRIGHTTEXT,
-            NonTSPseudoClass::MozLWThemeDarkText => DocumentState::LWTHEME_DARKTEXT,
             _ => DocumentState::empty(),
         }
     }
@@ -208,15 +200,13 @@ impl NonTSPseudoClass {
                       NonTSPseudoClass::MozNativeAnonymous |
                       // :-moz-placeholder is parsed but never matches.
                       NonTSPseudoClass::MozPlaceholder |
-                      // :-moz-locale-dir and :-moz-window-inactive depend only on
-                      // the state of the document, which is invariant across all
-                      // the elements involved in a given style cache.
-                      NonTSPseudoClass::MozLocaleDir(_) |
-                      NonTSPseudoClass::MozWindowInactive |
-                      // Similar for the document themes.
+                      // :-moz-lwtheme, :-moz-locale-dir and
+                      // :-moz-window-inactive depend only on the state of the
+                      // document, which is invariant across all the elements
+                      // involved in a given style cache.
                       NonTSPseudoClass::MozLWTheme |
-                      NonTSPseudoClass::MozLWThemeBrightText |
-                      NonTSPseudoClass::MozLWThemeDarkText
+                      NonTSPseudoClass::MozLocaleDir(_) |
+                      NonTSPseudoClass::MozWindowInactive
             )
     }
 }
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 1da116faf38..c7aea5b84d8 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -2063,8 +2063,6 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
             NonTSPseudoClass::MozIsHTML => self.is_html_element_in_html_document(),
 
             NonTSPseudoClass::MozLWTheme |
-            NonTSPseudoClass::MozLWThemeBrightText |
-            NonTSPseudoClass::MozLWThemeDarkText |
             NonTSPseudoClass::MozLocaleDir(..) |
             NonTSPseudoClass::MozWindowInactive => {
                 let state_bit = pseudo_class.document_state_flag();