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diff --git a/layout/base/tests/test_bug370436.html b/layout/base/tests/test_bug370436.html
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+++ b/layout/base/tests/test_bug370436.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  https://bugzilla.mozilla.org/show_bug.cgi?id=370436
+-->
+<head>
+  <title>Test for Bug 370436</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script class="testbody" type="application/javascript">
+words = new Array()
+
+function expandStringOffsetToWord(data, offset)
+{
+  if (data == undefined) return "";
+
+  var m1 = data.substr(0, offset).match(/\w+$/) || "";
+  var m2 = data.substr(offset).match(/^\w+/) || "";
+  return m1 + m2;
+}
+
+function onContextMenu(e)
+{
+  var node = SpecialPowers.wrap(e).rangeParent;
+  var offset = e.rangeOffset;
+
+  var word = expandStringOffsetToWord(node.data, offset);
+  words.push(word);
+}
+
+function startTest()
+{
+  var ta = document.getElementById('blah');
+  ta.focus();
+  ta.selectionStart = ta.selectionEnd = ta.value.length;
+
+  // Note: This test, intentionally or by accident, relies on sending button '0'
+  // with contextMenu, which triggers some key-equiv stuff in
+  // PresShell::AdjustContextMenuKeyEvent.
+  var mouseParams = { type: 'contextmenu', button: 0 };
+
+  /* Put cursor at start and middle of "sheep" */
+  synthesizeKey("KEY_ArrowUp")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+
+  /* Put cursor at the end of "hello" */
+  synthesizeKey("KEY_ArrowUp")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+  synthesizeKey("KEY_ArrowRight")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+
+  /* Put cursor on "welcome" */
+  synthesizeKey("KEY_ArrowUp")
+  synthesizeMouse(ta, 0, 0, mouseParams);
+
+  is(words.pop(), "welcome", "Word 1 selected correctly");
+  is(words.pop(), "world"  , "Word 2 selected correctly");
+  is(words.pop(), "hello"  , "Word 3 selected correctly");
+  is(words.pop(), "hello"  , "Word 4 selected correctly");
+  is(words.pop(), "sheep"  , "Word 5 selected correctly");
+  is(words.pop(), "sheep"  , "Word 6 selected correctly");
+  is(words.pop(), "sheep"  , "Word 7 selected correctly");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish()
+SimpleTest.waitForFocus(startTest)
+</script>
+
+<p><a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=370436">Mozilla Bug 370436</a></p>
+
+<textarea id="blah" rows="10" cols="80" oncontextmenu="onContextMenu(event); return false;">
+welcome
+hello world
+sheep
+</textarea>
+</body>
+</html>