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diff --git a/toolkit/content/tests/widgets/test_videocontrols_iframe_fullscreen.html b/toolkit/content/tests/widgets/test_videocontrols_iframe_fullscreen.html
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index 0000000000..0a74b25609
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+++ b/toolkit/content/tests/widgets/test_videocontrols_iframe_fullscreen.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Video controls test - iframe</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">
+<iframe id="ifr1"></iframe>
+<iframe id="ifr2" allowfullscreen></iframe>
+<iframe id="ifr1" allow="fullscreen 'none'"></iframe>
+</div>
+
+<pre id="test">
+<script clas="testbody" type="application/javascript">
+  SimpleTest.waitForExplicitFinish();
+
+  const testCases = [];
+
+  function checkIframeFullscreenAvailable(ifr) {
+    let video;
+
+    return () => new Promise(resolve => {
+      ifr.srcdoc = `<video id="video" controls preload="auto"></video>`;
+      ifr.addEventListener("load", resolve);
+    }).then(() => new Promise(resolve => {
+      video = ifr.contentDocument.getElementById("video");
+      video.src = "seek_with_sound.ogg";
+      video.addEventListener("loadedmetadata", resolve);
+    })).then(() => new Promise(resolve => {
+      const available = video.ownerDocument.fullscreenEnabled;
+      const controlBar = getElementWithinVideo(video, "controlBar");
+
+      is(controlBar.getAttribute("fullscreen-unavailable") == "true", !available, "The controlbar should have an attribute marking whether fullscreen is available that corresponds to if the iframe has the allowfullscreen attribute.");
+      resolve();
+    }));
+  }
+
+  function start() {
+    testCases.reduce((promise, task) => promise.then(task), Promise.resolve());
+  }
+
+  function load() {
+    SpecialPowers.pushPrefEnv({"set": [["media.cache_size", 40000]]}, start);
+  }
+
+  for (let iframe of document.querySelectorAll("iframe"))
+    testCases.push(checkIframeFullscreenAvailable(iframe));
+  testCases.push(SimpleTest.finish);
+
+  window.addEventListener("load", load);
+</script>
+</pre>
+</body>
+</html>