#596: chemspill M1626728 1620818

docshell/base/nsDocShell.cpp

@@ -856,6 +856,12 @@ nsDocShell::~nsDocShell()
     shPrivate->SetRootDocShell(nullptr);
   }
 
+  if (mContentViewer) {
+    mContentViewer->Close(nullptr);
+    mContentViewer->Destroy();
+    mContentViewer = nullptr;
+  }
+
   if (--gDocShellCount == 0) {
     NS_IF_RELEASE(sURIFixup);
   }

dom/cache/StreamList.cpp

@@ -138,7 +138,15 @@ StreamList::CloseAll()
 {
   NS_ASSERT_OWNINGTHREAD(StreamList);
   if (mStreamControl) {
-    mStreamControl->CloseAll();
+    auto streamControl = mStreamControl;
+    mStreamControl = nullptr;
+
+    streamControl->CloseAll();
+
+    mStreamControl = streamControl;
+    streamControl = nullptr;
+
+    mStreamControl->Shutdown();
   }
 }