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diff --git a/toolkit/content/tests/widgets/test_videocontrols_audio.html b/toolkit/content/tests/widgets/test_videocontrols_audio.html
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index 0000000000..ad528f4c27
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+++ b/toolkit/content/tests/widgets/test_videocontrols_audio.html
@@ -0,0 +1,40 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Video controls with Audio file test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script src="head.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+
+<div id="content">
+  <video id="video" controls preload="metadata"></video>
+</div>
+
+<pre id="test">
+<script>
+
+  const video = document.getElementById("video");
+  function loadedmetadata(event) {
+    SimpleTest.executeSoon(function() {
+      const controlBar = SpecialPowers.wrap(video).openOrClosedShadowRoot.querySelector(".controlBar");
+      is(controlBar.getAttribute("fullscreen-unavailable"), "true", "Fullscreen button is hidden");
+      SimpleTest.finish();
+    });
+  }
+
+  SpecialPowers.pushPrefEnv({"set": [["media.cache_size", 40000]]}, startTest);
+  function startTest() {
+    // Kick off test once audio has loaded.
+    video.addEventListener("loadedmetadata", loadedmetadata, { once: true });
+    video.src = "audio.ogg";
+  }
+
+  SimpleTest.waitForExplicitFinish();
+</script>
+</pre>
+</body>
+</html>