1 files changed, 6 insertions, 0 deletions
diff --git a/dom/script/ScriptLoader.h b/dom/script/ScriptLoader.h
index 20e76970f..2c5b683e7 100644
--- a/dom/script/ScriptLoader.h
+++ b/dom/script/ScriptLoader.h
@@ -173,6 +173,12 @@ public:
     return mScriptMode == ScriptMode::eAsync;
   }
 
+  virtual bool IsTopLevel() const
+  {
+    // Classic scripts are always top level.
+    return true;
+  }
+
   void MaybeCancelOffThreadScript();
 
   using super::getNext;