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diff --git a/editor/spellchecker/tests/test_bug1154791.html b/editor/spellchecker/tests/test_bug1154791.html
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+++ b/editor/spellchecker/tests/test_bug1154791.html
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+<!DOCTYPE>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1154791
+-->
+<head>
+  <title>Test for Bug 1154791</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+</head>
+<body>
+<div id="display">
+</div>
+
+<div id="content" contenteditable>
+<tt>thiss onee is stilll a</tt>
+</div>
+
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+
+let { maybeOnSpellCheck } = SpecialPowers.ChromeUtils.importESModule(
+  "resource://testing-common/AsyncSpellCheckTestHelper.sys.mjs"
+);
+
+/** Test for Bug 1154791 **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  var div = document.getElementById("content");
+  div.focus();
+  getSpellChecker().UpdateCurrentDictionary(() => {
+    synthesizeMouseAtCenter(div, {});
+    synthesizeKey("KEY_ArrowLeft");
+    synthesizeKey("KEY_ArrowLeft");
+
+    SimpleTest.executeSoon(function() {
+      synthesizeKey("KEY_Backspace");
+      SimpleTest.executeSoon(function() {
+        sendString(" ");
+
+        maybeOnSpellCheck(div, function() {
+          var sel = getSpellCheckSelection();
+          is(sel.rangeCount, 2, "We should have two misspelled words");
+          is(String(sel.getRangeAt(0)), "thiss", "Correct misspelled word");
+          is(String(sel.getRangeAt(1)), "onee", "Correct misspelled word");
+
+          SimpleTest.finish();
+        });
+      });
+    });
+  });
+});
+
+function getEditor() {
+  var editingSession = SpecialPowers.wrap(window).docShell.editingSession;
+  return editingSession.getEditorForWindow(window);
+}
+
+function getSpellChecker() {
+  return getEditor().getInlineSpellChecker(false).spellChecker;
+}
+
+function getSpellCheckSelection() {
+  var selcon = getEditor().selectionController;
+  return selcon.getSelection(selcon.SELECTION_SPELLCHECK);
+}
+
+</script>
+</body>
+
+</html>