--- a/netwerk/base/nsPACMan.cpp
+++ b/netwerk/base/nsPACMan.cpp
@@ -737,33 +737,21 @@ nsPACMan::AsyncOnChannelRedirect(nsIChan
   // However do track the most recent URI in the redirect change
   // as mPACURIRedirectSpec so that URI can be allowed to bypass
   // the proxy and actually fetch the pac file.
 
   callback->OnRedirectVerifyCallback(NS_OK);
   return NS_OK;
 }
 
-void
-nsPACMan::NamePACThread()
-{
-  MOZ_ASSERT(!NS_IsMainThread(), "wrong thread");
-  PR_SetCurrentThreadName("Proxy Resolution");
-}
-
 nsresult
 nsPACMan::Init(nsISystemProxySettings *systemProxySettings)
 {
   mSystemProxySettings = systemProxySettings;
 
-  nsresult rv = NS_NewThread(getter_AddRefs(mPACThread), nullptr);
-  if (NS_FAILED(rv))
-    return rv;
+  nsresult rv =
+    NS_NewNamedThread("ProxyResolution", getter_AddRefs(mPACThread));
 
-  // don't check return value as it is not a big deal for this to fail.
-  mPACThread->Dispatch(NewRunnableMethod(this, &nsPACMan::NamePACThread),
-                       nsIEventTarget::DISPATCH_NORMAL);
-
-  return NS_OK;
+  return rv;
 }
 
 } // namespace net
 } // namespace mozilla

--- a/netwerk/base/nsPACMan.h
+++ b/netwerk/base/nsPACMan.h
@@ -209,17 +209,16 @@ private:
    * execute the queue if it was otherwise empty
    */
   nsresult PostQuery(PendingPACQuery *query);
 
   // PAC thread operations only
   void PostProcessPendingQ();
   void PostCancelPendingQ(nsresult);
   bool ProcessPending();
-  void NamePACThread();
 
 private:
   ProxyAutoConfig mPAC;
   nsCOMPtr<nsIThread>           mPACThread;
   nsCOMPtr<nsISystemProxySettings> mSystemProxySettings;
 
   LinkedList<PendingPACQuery> mPendingQ; /* pac thread only */