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diff --git a/editor/spellchecker/tests/test_bug366682.html b/editor/spellchecker/tests/test_bug366682.html
new file mode 100644
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+++ b/editor/spellchecker/tests/test_bug366682.html
@@ -0,0 +1,65 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=366682
+-->
+<head>
+  <title>Test for Bug 366682</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script src="spellcheck.js"></script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=366682">Mozilla Bug 366682</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 366682 **/
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+var gMisspeltWords;
+
+function getEdit() {
+  return document.getElementById("edit");
+}
+
+function editDoc() {
+  return getEdit().contentDocument;
+}
+
+function getEditor() {
+  var win = editDoc().defaultView;
+  var editingSession = SpecialPowers.wrap(win).docShell.editingSession;
+  return editingSession.getEditorForWindow(win);
+}
+
+function runTest() {
+  editDoc().body.innerHTML = "<div>errror and an other errror</div>";
+  gMisspeltWords = ["errror", "errror"];
+  editDoc().designMode = "on";
+  editDoc().defaultView.focus();
+
+  const { maybeOnSpellCheck } = SpecialPowers.ChromeUtils.importESModule(
+    "resource://testing-common/AsyncSpellCheckTestHelper.sys.mjs"
+  );
+  maybeOnSpellCheck(editDoc().documentElement, evalTest);
+}
+
+function evalTest() {
+  ok(isSpellingCheckOk(getEditor(), gMisspeltWords),
+     "All misspellings accounted for.");
+  SimpleTest.finish();
+}
+</script>
+</pre>
+
+<iframe id="edit" width="200" height="100" src="about:blank"></iframe>
+
+</body>
+</html>