diff --git a/components/malloc_size_of/lib.rs b/components/malloc_size_of/lib.rs
index f2da13883b9..dbecc0da2c3 100644
--- a/components/malloc_size_of/lib.rs
+++ b/components/malloc_size_of/lib.rs
@@ -688,6 +688,12 @@ impl<T> MallocSizeOf for ipc_channel::ipc::IpcSender<T> {
     }
 }
 
+impl MallocSizeOf for ipc_channel::ipc::IpcSharedMemory {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        self.len()
+    }
+}
+
 impl<T: MallocSizeOf> MallocSizeOf for accountable_refcell::RefCell<T> {
     fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
         self.borrow().size_of(ops)
diff --git a/components/pixels/lib.rs b/components/pixels/lib.rs
index b327d401262..7cba060ec74 100644
--- a/components/pixels/lib.rs
+++ b/components/pixels/lib.rs
@@ -123,7 +123,6 @@ pub struct Image {
     pub width: u32,
     pub height: u32,
     pub format: PixelFormat,
-    #[ignore_malloc_size_of = "Defined in webrender_api"]
     pub id: Option<ImageKey>,
     pub cors_status: CorsStatus,
     pub frames: Vec<ImageFrame>,
@@ -132,7 +131,6 @@ pub struct Image {
 #[derive(Clone, Deserialize, MallocSizeOf, Serialize)]
 pub struct ImageFrame {
     pub delay: Option<Duration>,
-    #[ignore_malloc_size_of = "Defined in ipc-channel"]
     pub bytes: IpcSharedMemory,
     pub width: u32,
     pub height: u32,