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diff --git a/toolkit/content/tests/widgets/test_videocontrols_scrubber_position.html b/toolkit/content/tests/widgets/test_videocontrols_scrubber_position.html
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+<!DOCTYPE HTML>
+<!-- Any copyright is dedicated to the Public Domain.
+   - https://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+<head>
+  <title>Video controls test - Initial scrubber position</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+
+<div id="content">
+  <video width="320" height="240" id="video" mozNoDynamicControls preload="auto"></video>
+</div>
+
+<div id="host"></div>
+
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+const video = document.getElementById("video");
+
+add_task(async function setup() {
+  await new Promise(resolve => {
+    video.addEventListener("canplaythrough", resolve, {once: true});
+    video.src = "seek_with_sound.ogg";
+  });
+
+  // Check initial state upon load
+  is(video.paused, true, "checking video play state");
+});
+
+add_task(function test_initial_scrubber_position() {
+  // When the controls are shown after the initial video frame,
+  // reflowedDimensions might not be set...
+  video.setAttribute("controls", "true");
+
+  // ... but we still want to ensure the initial scrubber position
+  // is reasonable.
+  const scrubber = getElementWithinVideo(video, "scrubber");
+  ok(scrubber.max, "The max value should be set on the scrubber");
+  is(parseInt(scrubber.value), 0, "The initial position should be 0");
+});
+
+</script>
+</pre>
+</body>
+</html>