diff --git a/components/style/properties/longhands/column.mako.rs b/components/style/properties/longhands/column.mako.rs
index 2d9a116d30b..747a1c2db0a 100644
--- a/components/style/properties/longhands/column.mako.rs
+++ b/components/style/properties/longhands/column.mako.rs
@@ -13,7 +13,6 @@ ${helpers.predefined_type(
     engines="gecko servo-2013 servo-2020",
     servo_2020_pref="layout.2020.unimplemented",
     initial_specified_value="specified::length::NonNegativeLengthOrAuto::auto()",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     animation_value_type="NonNegativeLengthOrAuto",
     servo_2013_pref="layout.columns.enabled",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-width",
@@ -29,7 +28,6 @@ ${helpers.predefined_type(
     initial_specified_value="specified::ColumnCount::auto()",
     servo_2013_pref="layout.columns.enabled",
     animation_value_type="AnimatedColumnCount",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-count",
     servo_restyle_damage="rebuild_and_reflow",
 )}
@@ -38,7 +36,6 @@ ${helpers.single_keyword(
     "column-fill",
     "balance auto",
     engines="gecko",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     animation_value_type="discrete",
     gecko_enum_prefix="StyleColumnFill",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-fill",
@@ -53,7 +50,6 @@ ${helpers.predefined_type(
     computed_type="crate::values::computed::NonNegativeLength",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-rule-width",
     animation_value_type="NonNegativeLength",
-    extra_prefixes="moz:layout.css.prefixes.columns",
 )}
 
 // https://drafts.csswg.org/css-multicol-1/#crc
@@ -64,7 +60,6 @@ ${helpers.predefined_type(
     engines="gecko",
     initial_specified_value="specified::Color::currentcolor()",
     animation_value_type="AnimatedColor",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     ignored_when_colors_disabled=True,
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-rule-color",
 )}
@@ -76,7 +71,6 @@ ${helpers.single_keyword(
     animation_value_type="discrete",
     gecko_enum_prefix="StyleColumnSpan",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-span",
-    extra_prefixes="moz:layout.css.prefixes.columns",
 )}
 
 ${helpers.predefined_type(
@@ -85,7 +79,6 @@ ${helpers.predefined_type(
     "computed::BorderStyle::None",
     engines="gecko",
     initial_specified_value="specified::BorderStyle::None",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-rule-style",
 )}
diff --git a/components/style/properties/longhands/position.mako.rs b/components/style/properties/longhands/position.mako.rs
index 1795bde7e5f..7ca7772b9c7 100644
--- a/components/style/properties/longhands/position.mako.rs
+++ b/components/style/properties/longhands/position.mako.rs
@@ -434,7 +434,6 @@ ${helpers.predefined_type(
     "computed::length::NonNegativeLengthPercentageOrNormal::normal()",
     engines="gecko servo-2013",
     aliases="grid-column-gap" if engine == "gecko" else "",
-    extra_prefixes="moz:layout.css.prefixes.columns",
     servo_2013_pref="layout.columns.enabled",
     spec="https://drafts.csswg.org/css-align-3/#propdef-column-gap",
     animation_value_type="NonNegativeLengthPercentageOrNormal",
diff --git a/components/style/properties/shorthands/column.mako.rs b/components/style/properties/shorthands/column.mako.rs
index e7c775dff04..2fc8b72fae9 100644
--- a/components/style/properties/shorthands/column.mako.rs
+++ b/components/style/properties/shorthands/column.mako.rs
@@ -9,7 +9,6 @@
                     sub_properties="column-width column-count"
                     servo_2013_pref="layout.columns.enabled",
                     derive_serialize="True"
-                    extra_prefixes="moz:layout.css.prefixes.columns"
                     spec="https://drafts.csswg.org/css-multicol/#propdef-columns">
     use crate::properties::longhands::{column_count, column_width};
 
@@ -60,7 +59,6 @@
 <%helpers:shorthand
     name="column-rule"
     engines="gecko"
-    extra_prefixes="moz:layout.css.prefixes.columns"
     sub_properties="column-rule-width column-rule-style column-rule-color"
     derive_serialize="True"
     spec="https://drafts.csswg.org/css-multicol/#propdef-column-rule"