diff --git a/netwerk/base/nsSocketTransport2.cpp b/netwerk/base/nsSocketTransport2.cpp
index 5bddbb6728bb..fa3b4b187baf 100644
--- a/netwerk/base/nsSocketTransport2.cpp
+++ b/netwerk/base/nsSocketTransport2.cpp
@@ -2243,6 +2243,12 @@ void nsSocketTransport::OnSocketDetached(PRFileDesc* fd) {
     //
     mInput.OnSocketReady(mCondition);
     mOutput.OnSocketReady(mCondition);
+    if (mInputCopyContext) {
+      NS_CancelAsyncCopy(mInputCopyContext, mCondition);
+    }
+    if (mOutputCopyContext) {
+      NS_CancelAsyncCopy(mOutputCopyContext, mCondition);
+    }
   }
 
   if (mCondition == NS_ERROR_NET_RESET && mDNSRecord &&
@@ -2334,7 +2340,8 @@ nsSocketTransport::OpenInputStream(uint32_t flags, uint32_t segsize,
 
     // async copy from socket to pipe
     rv = NS_AsyncCopy(&mInput, pipeOut, mSocketTransportService,
-                      NS_ASYNCCOPY_VIA_WRITESEGMENTS, segsize);
+                      NS_ASYNCCOPY_VIA_WRITESEGMENTS, segsize, nullptr, nullptr,
+                      true, true, getter_AddRefs(mInputCopyContext));
     if (NS_FAILED(rv)) return rv;
 
     result = pipeIn;
@@ -2380,7 +2387,8 @@ nsSocketTransport::OpenOutputStream(uint32_t flags, uint32_t segsize,
 
     // async copy from socket to pipe
     rv = NS_AsyncCopy(pipeIn, &mOutput, mSocketTransportService,
-                      NS_ASYNCCOPY_VIA_READSEGMENTS, segsize);
+                      NS_ASYNCCOPY_VIA_READSEGMENTS, segsize, nullptr, nullptr,
+                      true, true, getter_AddRefs(mOutputCopyContext));
     if (NS_FAILED(rv)) return rv;
 
     result = pipeOut;
diff --git a/netwerk/base/nsSocketTransport2.h b/netwerk/base/nsSocketTransport2.h
index b5a703aa0656..ba31e5c9199f 100644
--- a/netwerk/base/nsSocketTransport2.h
+++ b/netwerk/base/nsSocketTransport2.h
@@ -307,6 +307,9 @@ class nsSocketTransport final : public nsASocketHandler,
   Atomic<bool> mInputClosed{true};
   Atomic<bool> mOutputClosed{true};
 
+  nsCOMPtr<nsISupports> mInputCopyContext;
+  nsCOMPtr<nsISupports> mOutputCopyContext;
+
   //-------------------------------------------------------------------------
   // members accessible only on the socket transport thread:
   //  (the exception being initialization/shutdown time)