--- a/media/audioipc/client/src/context.rs
+++ b/media/audioipc/client/src/context.rs
@@ -265,17 +265,17 @@ impl ContextOps for ClientContext {
 
     fn register_device_collection_changed(
         &mut self,
         _dev_type: DeviceType,
         _collection_changed_callback: ffi::cubeb_device_collection_changed_callback,
         _user_ptr: *mut c_void,
     ) -> Result<()> {
         assert_not_in_callback();
-        Ok(())
+        Err(Error::not_supported())
     }
 }
 
 impl Drop for ClientContext {
     fn drop(&mut self) {
         debug!("ClientContext dropped...");
         let _ = send_recv!(self.rpc(), ClientDisconnect => ClientDisconnected);
         unsafe {

new file mode 100644
--- /dev/null
+++ b/media/audioipc/register-collection-not-supported.patch
@@ -0,0 +1,22 @@
+diff --git a/media/audioipc/client/src/context.rs b/media/audioipc/client/src/context.rs
+--- a/media/audioipc/client/src/context.rs
++++ b/media/audioipc/client/src/context.rs
+@@ -265,17 +265,17 @@ impl ContextOps for ClientContext {
+ 
+     fn register_device_collection_changed(
+         &mut self,
+         _dev_type: DeviceType,
+         _collection_changed_callback: ffi::cubeb_device_collection_changed_callback,
+         _user_ptr: *mut c_void,
+     ) -> Result<()> {
+         assert_not_in_callback();
+-        Ok(())
++        Err(Error::not_supported())
+     }
+ }
+ 
+ impl Drop for ClientContext {
+     fn drop(&mut self) {
+         debug!("ClientContext dropped...");
+         let _ = send_recv!(self.rpc(), ClientDisconnect => ClientDisconnected);
+         unsafe {

--- a/media/audioipc/update.sh
+++ b/media/audioipc/update.sh
@@ -26,8 +26,11 @@ if [ -n "$rev" ]; then
   sed -i.bak -e "/The git commit ID used was/ s/[0-9a-f]\{40\}\(-dirty\)\{0,1\} .\{1,100\}/$version ($date)/" README_MOZILLA
   rm README_MOZILLA.bak
 else
   echo "Remember to update README_MOZILLA with the version details."
 fi
 
 echo "Applying gecko.patch on top of $rev"
 patch -p3 < gecko.patch
+
+echo "Applying register-collection-not-supported.patch on top of $rev"
+patch -p3 < register-collection-not-supported.patch