Bug 538698 - crash [@nsCacheService::DoomEntry_Internal(nsCacheEntry*)] on shutdown, r=biesi

netwerk/cache/src/nsCacheService.cpp

@@ -1494,6 +1494,11 @@ void
 nsCacheService::OnProfileShutdown(PRBool cleanse)
 {
     if (!gService)  return;
+    if (!gService->mInitialized) {
+        // The cache service has been shut down, but someone is still holding
+        // a reference to it. Ignore this call.
+        return;
+    }
     nsCacheServiceAutoLock lock;
 
     gService->DoomActiveEntries();