diff --git a/components/layout/display_list/builder.rs b/components/layout/display_list/builder.rs
index 542ab95172a..56748d55d2b 100644
--- a/components/layout/display_list/builder.rs
+++ b/components/layout/display_list/builder.rs
@@ -800,11 +800,9 @@ impl Fragment {
                         );
                     }
                 },
-                Image::Rect(_) => {
-                    // TODO: Implement `-moz-image-rect`
-                },
-                Image::Element(_) => {
-                    // TODO: Implement `-moz-element`
+                Image::Rect(ref rect) => {
+                    // This is a (boxed) empty enum on non-Gecko
+                    match **rect {}
                 },
             }
         }
diff --git a/components/style/traversal.rs b/components/style/traversal.rs
index 360f5b6a25c..f73a533b718 100644
--- a/components/style/traversal.rs
+++ b/components/style/traversal.rs
@@ -679,7 +679,7 @@ where
     element.finish_restyle(context, data, new_styles, important_rules_changed)
 }
 
-#[cfg(feature = "servo")]
+#[cfg(feature = "servo-layout-2013")]
 fn notify_paint_worklet<E>(context: &StyleContext<E>, data: &ElementData)
 where
     E: TElement,
@@ -719,7 +719,7 @@ where
     }
 }
 
-#[cfg(feature = "gecko")]
+#[cfg(not(feature = "servo-layout-2013"))]
 fn notify_paint_worklet<E>(_context: &StyleContext<E>, _data: &ElementData)
 where
     E: TElement,
diff --git a/components/style/values/computed/image.rs b/components/style/values/computed/image.rs
index 841f3293c1a..bd59acac547 100644
--- a/components/style/values/computed/image.rs
+++ b/components/style/values/computed/image.rs
@@ -9,10 +9,11 @@
 
 use crate::values::computed::position::Position;
 use crate::values::computed::url::ComputedImageUrl;
+#[cfg(feature = "gecko")]
+use crate::values::computed::NumberOrPercentage;
 use crate::values::computed::{Angle, Color, Context};
 use crate::values::computed::{
-    LengthPercentage, NonNegativeLength, NonNegativeLengthPercentage, NumberOrPercentage,
-    ToComputedValue,
+    LengthPercentage, NonNegativeLength, NonNegativeLengthPercentage, ToComputedValue,
 };
 use crate::values::generics::image::{self as generic, GradientCompatMode};
 use crate::values::specified::image::LineDirection as SpecifiedLineDirection;
@@ -63,8 +64,13 @@ pub type GradientItem = generic::GenericGradientItem<Color, LengthPercentage>;
 pub type ColorStop = generic::ColorStop<Color, LengthPercentage>;
 
 /// Computed values for `-moz-image-rect(...)`.
+#[cfg(feature = "gecko")]
 pub type MozImageRect = generic::MozImageRect<NumberOrPercentage, ComputedImageUrl>;
 
+/// Empty enum on non-gecko
+#[cfg(not(feature = "gecko"))]
+pub type MozImageRect = crate::values::specified::image::MozImageRect;
+
 impl generic::LineDirection for LineDirection {
     fn points_downwards(&self, compat_mode: GradientCompatMode) -> bool {
         match *self {
diff --git a/components/style/values/generics/image.rs b/components/style/values/generics/image.rs
index ab2a906ae10..a6b45bc82ad 100644
--- a/components/style/values/generics/image.rs
+++ b/components/style/values/generics/image.rs
@@ -53,17 +53,24 @@ impl<I> ImageLayer<I> {
 pub enum GenericImage<Gradient, MozImageRect, ImageUrl> {
     /// A `<url()>` image.
     Url(ImageUrl),
+
     /// A `<gradient>` image.  Gradients are rather large, and not nearly as
     /// common as urls, so we box them here to keep the size of this enum sane.
     Gradient(Box<Gradient>),
+
     /// A `-moz-image-rect` image.  Also fairly large and rare.
+    // not cfg’ed out on non-Gecko to avoid `error[E0392]: parameter `MozImageRect` is never used`
+    // Instead we make MozImageRect an empty enum
     Rect(Box<MozImageRect>),
+
     /// A `-moz-element(# <element-id>)`
+    #[cfg(feature = "gecko")]
     #[css(function = "-moz-element")]
     Element(Atom),
+
     /// A paint worklet image.
     /// <https://drafts.css-houdini.org/css-paint-api/>
-    #[cfg(feature = "servo")]
+    #[cfg(feature = "servo-layout-2013")]
     PaintWorklet(PaintWorklet),
 }
 
@@ -323,8 +330,9 @@ where
             Image::Url(ref url) => url.to_css(dest),
             Image::Gradient(ref gradient) => gradient.to_css(dest),
             Image::Rect(ref rect) => rect.to_css(dest),
-            #[cfg(feature = "servo")]
+            #[cfg(feature = "servo-layout-2013")]
             Image::PaintWorklet(ref paint_worklet) => paint_worklet.to_css(dest),
+            #[cfg(feature = "gecko")]
             Image::Element(ref selector) => {
                 dest.write_str("-moz-element(#")?;
                 serialize_atom_identifier(selector, dest)?;
diff --git a/components/style/values/specified/image.rs b/components/style/values/specified/image.rs
index 126a4cc69d1..14a2a9ad9c8 100644
--- a/components/style/values/specified/image.rs
+++ b/components/style/values/specified/image.rs
@@ -9,7 +9,6 @@
 
 use crate::custom_properties::SpecifiedValue;
 use crate::parser::{Parse, ParserContext};
-use crate::stylesheets::CorsMode;
 use crate::values::generics::image::PaintWorklet;
 use crate::values::generics::image::{
     self as generic, Circle, Ellipse, GradientCompatMode, ShapeExtent,
@@ -119,8 +118,24 @@ pub type ColorStop = generic::ColorStop<Color, LengthPercentage>;
 
 /// Specified values for `moz-image-rect`
 /// -moz-image-rect(<uri>, top, right, bottom, left);
+#[cfg(feature = "gecko")]
 pub type MozImageRect = generic::MozImageRect<NumberOrPercentage, SpecifiedImageUrl>;
 
+#[cfg(not(feature = "gecko"))]
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+/// Empty enum on non-Gecko
+pub enum MozImageRect {}
+
 impl Parse for Image {
     fn parse<'i, 't>(
         context: &ParserContext,
@@ -132,16 +147,21 @@ impl Parse for Image {
         if let Ok(gradient) = input.try(|i| Gradient::parse(context, i)) {
             return Ok(generic::Image::Gradient(Box::new(gradient)));
         }
-        #[cfg(feature = "servo")]
+        #[cfg(feature = "servo-layout-2013")]
         {
             if let Ok(paint_worklet) = input.try(|i| PaintWorklet::parse(context, i)) {
                 return Ok(generic::Image::PaintWorklet(paint_worklet));
             }
         }
-        if let Ok(image_rect) = input.try(|input| MozImageRect::parse(context, input)) {
-            return Ok(generic::Image::Rect(Box::new(image_rect)));
+        #[cfg(feature = "gecko")]
+        {
+            if let Ok(image_rect) = input.try(|input| MozImageRect::parse(context, input)) {
+                return Ok(generic::Image::Rect(Box::new(image_rect)));
+            }
+            Ok(generic::Image::Element(Image::parse_element(input)?))
         }
-        Ok(generic::Image::Element(Image::parse_element(input)?))
+        #[cfg(not(feature = "gecko"))]
+        Err(input.new_error_for_next_token())
     }
 }
 
@@ -155,6 +175,7 @@ impl Image {
     }
 
     /// Parses a `-moz-element(# <element-id>)`.
+    #[cfg(feature = "gecko")]
     fn parse_element<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Atom, ParseError<'i>> {
         input.try(|i| i.expect_function_matching("-moz-element"))?;
         let location = input.current_source_location();
@@ -856,6 +877,15 @@ impl Parse for PaintWorklet {
 }
 
 impl Parse for MozImageRect {
+    #[cfg(not(feature = "gecko"))]
+    fn parse<'i, 't>(
+        _context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
+        Err(input.new_error_for_next_token())
+    }
+
+    #[cfg(feature = "gecko")]
     fn parse<'i, 't>(
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
@@ -866,7 +896,7 @@ impl Parse for MozImageRect {
             let url = SpecifiedImageUrl::parse_from_string(
                 string.as_ref().to_owned(),
                 context,
-                CorsMode::None,
+                crate::stylesheets::CorsMode::None,
             );
             i.expect_comma()?;
             let top = NumberOrPercentage::parse_non_negative(context, i)?;