diff --git a/netwerk/base/src/nsStreamTransportService.cpp b/netwerk/base/src/nsStreamTransportService.cpp
index 817aed84b74..bbe17144616 100644
--- a/netwerk/base/src/nsStreamTransportService.cpp
+++ b/netwerk/base/src/nsStreamTransportService.cpp
@@ -430,6 +430,8 @@ nsOutputStreamTransport::IsNonBlocking(bool *result)
 // nsStreamTransportService
 //-----------------------------------------------------------------------------
 
+bool nsStreamTransportService::sHasBeenShutdown = false;
+
 nsStreamTransportService::~nsStreamTransportService()
 {
     NS_ASSERTION(!mPool, "thread pool wasn't shutdown");
@@ -438,6 +440,11 @@ nsStreamTransportService::~nsStreamTransportService()
 nsresult
 nsStreamTransportService::Init()
 {
+    if (sHasBeenShutdown) {
+      // Prevent any attempt at resurrection
+      // (see bug 845190)
+      return NS_ERROR_NOT_AVAILABLE;
+    }
     mPool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
     NS_ENSURE_STATE(mPool);
 
@@ -508,7 +515,7 @@ nsStreamTransportService::Observe(nsISupports *subject, const char *topic,
                                   const PRUnichar *data)
 {
   NS_ASSERTION(strcmp(topic, "xpcom-shutdown-threads") == 0, "oops");
-
+  sHasBeenShutdown = true;
   if (mPool) {
     mPool->Shutdown();
     mPool = nullptr;
diff --git a/netwerk/base/src/nsStreamTransportService.h b/netwerk/base/src/nsStreamTransportService.h
index 0b01a8bd4d2..383a3caa79f 100644
--- a/netwerk/base/src/nsStreamTransportService.h
+++ b/netwerk/base/src/nsStreamTransportService.h
@@ -27,4 +27,10 @@ private:
     ~nsStreamTransportService();
 
     nsCOMPtr<nsIThreadPool> mPool;
+
+    /**
+     * |true| if we have shutdown once already, in which
+     * case we should reject any attempt to resurrect.
+     */
+    static bool sHasBeenShutdown;
 };