diff --git a/content/media/test/Makefile.in b/content/media/test/Makefile.in
index 01e889047583..b1c20ffc5ac3 100644
--- a/content/media/test/Makefile.in
+++ b/content/media/test/Makefile.in
@@ -106,6 +106,7 @@ _TEST_FILES = \
 		test_bug493187.html \
 		test_bug495145.html \
 		test_bug495300.html \
+		test_bug686942.html \
 		test_can_play_type.html \
 		test_closing_connections.html \
 		test_constants.html \
diff --git a/content/media/test/test_bug686942.html b/content/media/test/test_bug686942.html
new file mode 100644
index 000000000000..ae5a9a95203e
--- /dev/null
+++ b/content/media/test/test_bug686942.html
@@ -0,0 +1,65 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=686942
+-->
+
+<head>
+  <title>Test for Bug 448534</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="manifest.js"></script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=448535">Mozilla Bug 686942</a>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+var manager = new MediaTestManager;
+
+function onloaded(event) {
+  var v = event.target;
+  v.currentTime = v.duration;
+  return false;
+}
+
+function checkNotPlaying(v) {
+  ok(v.currentTime == 0, "Should not be playing after seek to end and back to beginning");
+  v._finished = true;
+  manager.finished(v.token);
+}
+
+function onseeked(event) {
+  var v = event.target;
+  setTimeout(function() { checkNotPlaying(v); }, 500);
+  return false;
+}
+
+function onended(event) {
+  var v = event.target;
+  if (v._finished)
+    return false;
+  v.addEventListener("seeked", onseeked, false);
+  v.currentTime = 0;
+  return false;
+}
+
+function startTest(test, token) {
+  var v = document.createElement('video');
+  v.token = token;
+  manager.started(token);
+  v.src = test.name;
+  v._played = false;
+  v._finished = false;
+  v.addEventListener("loadedmetadata", onloaded, false);
+  v.addEventListener("ended", onended, false);
+
+  document.body.appendChild(v);
+}
+
+manager.runTests(gSmallTests, startTest);
+
+</script>
+</pre>
+</body>
+</html>
