It is missing from: NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED and NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED and I believe it should be added here as: NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mError) and NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mError)
Created attachment 630119 [details] [diff] [review] Patch
Comment on attachment 630119 [details] [diff] [review] Patch In practice this shouldn't matter atm, since DOMError shouldn't keep anything alive. But this is future-proof. Once DOMError starts to use new bindings, it may keep stuff alive.