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diff --git a/dom/media/webspeech/synth/test/file_global_queue.html b/dom/media/webspeech/synth/test/file_global_queue.html
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+++ b/dom/media/webspeech/synth/test/file_global_queue.html
@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1188099
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1188099: Global queue should correctly schedule utterances</title>
+  <script type="application/javascript">
+    window.SimpleTest = parent.SimpleTest;
+    window.info = parent.info;
+    window.is = parent.is;
+    window.isnot = parent.isnot;
+    window.ok = parent.ok;
+    window.todo = parent.todo;
+  </script>
+  <script type="application/javascript" src="common.js"></script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1188099">Mozilla Bug 1188099</a>
+<iframe id="frame1"></iframe>
+<iframe id="frame2"></iframe>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+  Promise.all([loadFrame('frame1'), loadFrame('frame2')]).then(function ([frame1, frame2]) {
+    var win1 = frame1.contentWindow;
+    var win2 = frame2.contentWindow;
+    var utterance1 = new win1.SpeechSynthesisUtterance("hello, losers");
+    var utterance2 = new win1.SpeechSynthesisUtterance("hello, losers three");
+    var utterance3 = new win2.SpeechSynthesisUtterance("hello, losers too");
+    var eventOrder = ['start1', 'end1', 'start3', 'end3', 'start2', 'end2'];
+    utterance1.addEventListener('start', function(e) {
+      is(eventOrder.shift(), 'start1', 'start1');
+      testSynthState(win1, { speaking: true, pending: true });
+      testSynthState(win2, { speaking: true, pending: true });
+    });
+    utterance1.addEventListener('end', function(e) {
+      is(eventOrder.shift(), 'end1', 'end1');
+    });
+    utterance3.addEventListener('start', function(e) {
+      is(eventOrder.shift(), 'start3', 'start3');
+      testSynthState(win1, { speaking: true, pending: true });
+      testSynthState(win2, { speaking: true, pending: false });
+    });
+    utterance3.addEventListener('end', function(e) {
+      is(eventOrder.shift(), 'end3', 'end3');
+    });
+    utterance2.addEventListener('start', function(e) {
+      is(eventOrder.shift(), 'start2', 'start2');
+      testSynthState(win1, { speaking: true, pending: false });
+      testSynthState(win2, { speaking: true, pending: false });
+    });
+    utterance2.addEventListener('end', function(e) {
+      is(eventOrder.shift(), 'end2', 'end2');
+      testSynthState(win1, { speaking: false, pending: false });
+      testSynthState(win2, { speaking: false, pending: false });
+      SimpleTest.finish();
+    });
+    win1.speechSynthesis.speak(utterance1);
+    win1.speechSynthesis.speak(utterance2);
+    win2.speechSynthesis.speak(utterance3);
+  });
+</script>
+</pre>
+</body>
+</html>