diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 9c5e4864dab..3f15a316af3 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -7250,9 +7250,11 @@ def camel_to_upper_snake(s):
 
 def process_arg(expr, arg):
     if arg.type.isGeckoInterface() and not arg.type.unroll().inner.isCallback():
-        if arg.variadic or arg.type.isSequence() or arg.type.nullable() and arg.optional:
+        if arg.variadic or arg.type.isSequence():
             expr += ".r()"
-        elif arg.type.nullable() or arg.optional:
+        elif arg.type.nullable() and arg.optional and not arg.defaultValue:
+            expr += ".as_ref().map(Option::deref)"
+        elif arg.type.nullable() or arg.optional and not arg.defaultValue:
             expr += ".deref()"
         else:
             expr = "&" + expr
diff --git a/components/script/dom/bindings/root.rs b/components/script/dom/bindings/root.rs
index 9e158b450d8..86184af243d 100644
--- a/components/script/dom/bindings/root.rs
+++ b/components/script/dom/bindings/root.rs
@@ -264,13 +264,6 @@ pub trait RootedReference<'root> {
     fn r(&'root self) -> Self::Ref;
 }
 
-impl<'root, T: DomObject + 'root> RootedReference<'root> for DomRoot<T> {
-    type Ref = &'root T;
-    fn r(&'root self) -> &'root T {
-        self
-    }
-}
-
 impl<'root, T: JSTraceable + DomObject + 'root> RootedReference<'root> for [Dom<T>] {
     type Ref = &'root [&'root T];
     fn r(&'root self) -> &'root [&'root T] {
@@ -278,13 +271,6 @@ impl<'root, T: JSTraceable + DomObject + 'root> RootedReference<'root> for [Dom<
     }
 }
 
-impl<'root, T: RootedReference<'root> + 'root> RootedReference<'root> for Option<T> {
-    type Ref = Option<T::Ref>;
-    fn r(&'root self) -> Option<T::Ref> {
-        self.as_ref().map(RootedReference::r)
-    }
-}
-
 /// A traced reference to a DOM object
 ///
 /// This type is critical to making garbage collection work with the DOM,