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diff --git a/devtools/client/storage/test/storage-indexeddb-duplicate-names.html b/devtools/client/storage/test/storage-indexeddb-duplicate-names.html
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+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+  <meta charset="utf-8">
+  <title>Storage inspector IndexedDBs with duplicate names</title>
+
+  <script type="application/javascript;version=1.7">
+    "use strict";
+
+    function createIndexedDBs() {
+      createIndexedDB("idb1", "temporary");
+      createIndexedDB("idb1", "default");
+      createIndexedDB("idb1", "persistent");
+      createIndexedDB("idb2", "temporary");
+      createIndexedDB("idb2", "default");
+      createIndexedDB("idb2", "persistent");
+    }
+
+    function createIndexedDB(name, storage) {
+      let open = indexedDB.open(name, {storage: storage});
+
+      open.onsuccess = function () {
+        let db = open.result;
+        db.close();
+      };
+    }
+
+    function deleteDB(dbName, storage) {
+      return new Promise(resolve => {
+        dump(`removing database ${dbName} (${storage}) from ${document.location}\n`);
+        indexedDB.deleteDatabase(dbName, { storage: storage }).onsuccess = resolve;
+      });
+    }
+
+    window.clear = function* () {
+      yield deleteDB("idb1", "temporary");
+      yield deleteDB("idb1", "default");
+      yield deleteDB("idb1", "persistent");
+      yield deleteDB("idb2", "temporary");
+      yield deleteDB("idb2", "default");
+      yield deleteDB("idb2", "persistent");
+
+      dump(`removed indexedDB data from ${document.location}\n`);
+    };
+  </script>
+</head>
+<body onload="createIndexedDBs()">
+  <h1>storage-indexeddb-duplicate-names.html</h1>
+</body>
+</html>