--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -3185,27 +3185,36 @@ ContentParent::KillHard(const char* aRea
       NS_LITERAL_CSTRING("ipc_channel_error"),
       reason);
 
     Telemetry::Accumulate(Telemetry::SUBPROCESS_KILL_HARD, reason, 1);
 
     RefPtr<ContentParent> self = this;
     std::function<void(bool)> callback = [self](bool aResult) {
       self->OnGenerateMinidumpComplete(aResult);
+      MessageChannel* channel = self->GetIPCChannel();
+      if (channel) {
+        channel->Close();
+      }
     };
     // Generate the report and insert into the queue for submittal.
     mCrashReporter->GenerateMinidumpAndPair(Process(),
                                             nullptr,
                                             NS_LITERAL_CSTRING("browser"),
                                             Move(callback),
                                             true);
     return;
   }
 
   OnGenerateMinidumpComplete(false);
+
+  MessageChannel* channel = GetIPCChannel();
+  if (channel) {
+    channel->Close();
+  }
 }
 
 void
 ContentParent::OnGenerateMinidumpComplete(bool aDumpResult)
 {
   if (mCrashReporter && aDumpResult) {
     // CrashReporterHost::GenerateMinidumpAndPair() is successful.
     mCreatedPairedMinidumps = mCrashReporter->FinalizeCrashReport();