diff --git a/dom/websocket/WebSocket.cpp b/dom/websocket/WebSocket.cpp
index 1df3136e0d62..b0452eec6792 100644
--- a/dom/websocket/WebSocket.cpp
+++ b/dom/websocket/WebSocket.cpp
@@ -860,23 +860,6 @@ WebSocketImpl::OnServerClose(nsISupports* aContext, uint16_t aCode,
   return NS_OK;
 }
 
-NS_IMETHODIMP
-WebSocketImpl::OnError() {
-  if (!IsTargetThread()) {
-    return Dispatch(
-        NS_NewRunnableFunction("dom::FailConnectionRunnable",
-                               [self = RefPtr{this}]() {
-                                 self->FailConnection(
-                                     nsIWebSocketChannel::CLOSE_ABNORMAL);
-                               }),
-        NS_DISPATCH_NORMAL);
-  }
-
-  AssertIsOnTargetThread();
-  FailConnection(nsIWebSocketChannel::CLOSE_ABNORMAL);
-  return NS_OK;
-}
-
 //-----------------------------------------------------------------------------
 // WebSocketImpl::nsIInterfaceRequestor
 //-----------------------------------------------------------------------------
diff --git a/netwerk/protocol/websocket/WebSocketChannelChild.cpp b/netwerk/protocol/websocket/WebSocketChannelChild.cpp
index ae9da1028fef..13c137f0f219 100644
--- a/netwerk/protocol/websocket/WebSocketChannelChild.cpp
+++ b/netwerk/protocol/websocket/WebSocketChannelChild.cpp
@@ -294,44 +294,22 @@ class MessageEvent : public WebSocketEvent {
   bool mBinary;
 };
 
-bool WebSocketChannelChild::RecvOnMessageAvailableInternal(
+void WebSocketChannelChild::RecvOnMessageAvailableInternal(
     const nsDependentCSubstring& aMsg, bool aMoreData, bool aBinary) {
   if (aMoreData) {
-    return mReceivedMsgBuffer.Append(aMsg, fallible);
-  }
-
-  if (!mReceivedMsgBuffer.Append(aMsg, fallible)) {
-    return false;
+    mReceivedMsgBuffer.Append(aMsg);
+    return;
   }
 
+  mReceivedMsgBuffer.Append(aMsg);
   mEventQ->RunOrEnqueue(new EventTargetDispatcher(
       this, new MessageEvent(mReceivedMsgBuffer, aBinary), mTargetThread));
   mReceivedMsgBuffer.Truncate();
-  return true;
-}
-
-class OnErrorEvent : public WebSocketEvent {
- public:
-  OnErrorEvent() = default;
-
-  void Run(WebSocketChannelChild* aChild) override { aChild->OnError(); }
-};
-
-void WebSocketChannelChild::OnError() {
-  LOG(("WebSocketChannelChild::OnError() %p", this));
-  if (mListenerMT) {
-    AutoEventEnqueuer ensureSerialDispatch(mEventQ);
-    Unused << mListenerMT->mListener->OnError();
-  }
 }
 
 mozilla::ipc::IPCResult WebSocketChannelChild::RecvOnMessageAvailable(
     const nsDependentCSubstring& aMsg, const bool& aMoreData) {
-  if (!RecvOnMessageAvailableInternal(aMsg, aMoreData, false)) {
-    LOG(("WebSocketChannelChild %p append message failed", this));
-    mEventQ->RunOrEnqueue(
-        new EventTargetDispatcher(this, new OnErrorEvent(), mTargetThread));
-  }
+  RecvOnMessageAvailableInternal(aMsg, aMoreData, false);
   return IPC_OK();
 }
 
@@ -353,11 +331,7 @@ void WebSocketChannelChild::OnMessageAvailable(const nsCString& aMsg) {
 
 mozilla::ipc::IPCResult WebSocketChannelChild::RecvOnBinaryMessageAvailable(
     const nsDependentCSubstring& aMsg, const bool& aMoreData) {
-  if (!RecvOnMessageAvailableInternal(aMsg, aMoreData, true)) {
-    LOG(("WebSocketChannelChild %p append message failed", this));
-    mEventQ->RunOrEnqueue(
-        new EventTargetDispatcher(this, new OnErrorEvent(), mTargetThread));
-  }
+  RecvOnMessageAvailableInternal(aMsg, aMoreData, true);
   return IPC_OK();
 }
 
diff --git a/netwerk/protocol/websocket/WebSocketChannelChild.h b/netwerk/protocol/websocket/WebSocketChannelChild.h
index 4be4ada669f0..57fa335bf8df 100644
--- a/netwerk/protocol/websocket/WebSocketChannelChild.h
+++ b/netwerk/protocol/websocket/WebSocketChannelChild.h
@@ -82,11 +82,9 @@ class WebSocketChannelChild final : public BaseWebSocketChannel,
   // This function tries to get a labeled event target for |mNeckoTarget|.
   void SetupNeckoTarget();
 
-  bool RecvOnMessageAvailableInternal(const nsDependentCSubstring& aMsg,
+  void RecvOnMessageAvailableInternal(const nsDependentCSubstring& aMsg,
                                       bool aMoreData, bool aBinary);
 
-  void OnError();
-
   RefPtr<ChannelEventQueue> mEventQ;
   nsString mEffectiveURL;
   nsCString mReceivedMsgBuffer;
@@ -102,7 +100,6 @@ class WebSocketChannelChild final : public BaseWebSocketChannel,
   friend class AcknowledgeEvent;
   friend class ServerCloseEvent;
   friend class AsyncOpenFailedEvent;
-  friend class OnErrorEvent;
 };
 
 }  // namespace net
diff --git a/netwerk/protocol/websocket/WebSocketChannelParent.cpp b/netwerk/protocol/websocket/WebSocketChannelParent.cpp
index a1c352447148..c6fcd23e4cb5 100644
--- a/netwerk/protocol/websocket/WebSocketChannelParent.cpp
+++ b/netwerk/protocol/websocket/WebSocketChannelParent.cpp
@@ -307,9 +307,6 @@ WebSocketChannelParent::OnServerClose(nsISupports* aContext, uint16_t code,
   return NS_OK;
 }
 
-NS_IMETHODIMP
-WebSocketChannelParent::OnError() { return NS_OK; }
-
 void WebSocketChannelParent::ActorDestroy(ActorDestroyReason why) {
   LOG(("WebSocketChannelParent::ActorDestroy() %p\n", this));
 
diff --git a/netwerk/protocol/websocket/nsIWebSocketListener.idl b/netwerk/protocol/websocket/nsIWebSocketListener.idl
index 4a8416b7580d..f49009d5ae86 100644
--- a/netwerk/protocol/websocket/nsIWebSocketListener.idl
+++ b/netwerk/protocol/websocket/nsIWebSocketListener.idl
@@ -85,12 +85,6 @@ interface nsIWebSocketListener : nsISupports
                                   in unsigned short aCode,
                                   in AUTF8String aReason);
 
-    /**
-     * Called to inform an error is happened. The connection will be closed
-     * when this is called.
-     */
-    [must_use] void OnError();
-
 };