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diff --git a/dom/media/mediasource/test/test_BufferedSeek_mp4.html b/dom/media/mediasource/test/test_BufferedSeek_mp4.html
new file mode 100644
index 0000000000..e89e972c91
--- /dev/null
+++ b/dom/media/mediasource/test/test_BufferedSeek_mp4.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seeking in buffered range</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+
+  const target = 1.3;
+
+  await once(v, "loadedmetadata");
+  ok(true, "received loadedmetadata");
+  v.currentTime = target;
+
+  let wasSeeking = false;
+
+  v.addEventListener("seeking", () => {
+    wasSeeking = true;
+    is(v.currentTime, target, "Video currentTime at target");
+  });
+
+  await once(v, "seeked");
+  ok(wasSeeking, "Received expected seeking and seeked events");
+  is(v.currentTime, target, "Video currentTime at target");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>