diff --git a/components/style/properties/data.py b/components/style/properties/data.py
index 49157860fbb..019899ecde1 100644
--- a/components/style/properties/data.py
+++ b/components/style/properties/data.py
@@ -486,7 +486,6 @@ class Longhand(Property):
                 "MasonryAutoFlow",
                 "MozForceBrokenImageIcon",
                 "text::MozControlCharacterVisibility",
-                "MozListReversed",
                 "MathDepth",
                 "MozScriptMinSize",
                 "MozScriptSizeMultiplier",
diff --git a/components/style/properties/longhands/list.mako.rs b/components/style/properties/longhands/list.mako.rs
index 99d848d9db6..dcaa1bcac29 100644
--- a/components/style/properties/longhands/list.mako.rs
+++ b/components/style/properties/longhands/list.mako.rs
@@ -84,14 +84,3 @@ ${helpers.predefined_type(
     boxed=True,
     spec="Nonstandard (https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-image-region)",
 )}
-
-${helpers.predefined_type(
-    "-moz-list-reversed",
-    "MozListReversed",
-    "computed::MozListReversed::False",
-    engines="gecko",
-    animation_value_type="discrete",
-    enabled_in="ua",
-    spec="Internal implementation detail for <ol reversed>",
-    servo_restyle_damage="rebuild_and_reflow",
-)}
diff --git a/components/style/values/computed/list.rs b/components/style/values/computed/list.rs
index 2ae3776041b..3e5d1eb220d 100644
--- a/components/style/values/computed/list.rs
+++ b/components/style/values/computed/list.rs
@@ -6,7 +6,6 @@
 
 #[cfg(feature = "gecko")]
 pub use crate::values::specified::list::ListStyleType;
-pub use crate::values::specified::list::MozListReversed;
 pub use crate::values::specified::list::Quotes;
 
 impl Quotes {
diff --git a/components/style/values/computed/mod.rs b/components/style/values/computed/mod.rs
index 25103b34772..9d775b45cd4 100644
--- a/components/style/values/computed/mod.rs
+++ b/components/style/values/computed/mod.rs
@@ -69,7 +69,6 @@ pub use self::length::{LengthOrAuto, LengthPercentageOrAuto, MaxSize, Size};
 pub use self::length::{NonNegativeLengthPercentage, NonNegativeLengthPercentageOrAuto};
 #[cfg(feature = "gecko")]
 pub use self::list::ListStyleType;
-pub use self::list::MozListReversed;
 pub use self::list::Quotes;
 pub use self::motion::{OffsetPath, OffsetRotate};
 pub use self::outline::OutlineStyle;
diff --git a/components/style/values/specified/list.rs b/components/style/values/specified/list.rs
index 14004e65cc8..ff21eb5115e 100644
--- a/components/style/values/specified/list.rs
+++ b/components/style/values/specified/list.rs
@@ -199,27 +199,3 @@ impl Parse for Quotes {
         }
     }
 }
-
-/// Specified and computed `-moz-list-reversed` property (for UA sheets only).
-#[derive(
-    Clone,
-    Copy,
-    Debug,
-    Eq,
-    Hash,
-    MallocSizeOf,
-    Parse,
-    PartialEq,
-    SpecifiedValueInfo,
-    ToComputedValue,
-    ToCss,
-    ToResolvedValue,
-    ToShmem,
-)]
-#[repr(u8)]
-pub enum MozListReversed {
-    /// the initial value
-    False,
-    /// exclusively used for <ol reversed> in our html.css UA sheet
-    True,
-}
diff --git a/components/style/values/specified/mod.rs b/components/style/values/specified/mod.rs
index 4aeee691566..8923a868a7c 100644
--- a/components/style/values/specified/mod.rs
+++ b/components/style/values/specified/mod.rs
@@ -66,7 +66,6 @@ pub use self::length::{
 };
 #[cfg(feature = "gecko")]
 pub use self::list::ListStyleType;
-pub use self::list::MozListReversed;
 pub use self::list::Quotes;
 pub use self::motion::{OffsetPath, OffsetRotate};
 pub use self::outline::OutlineStyle;