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diff --git a/dom/media/test/test_temporary_file_blob_video_plays.html b/dom/media/test/test_temporary_file_blob_video_plays.html
new file mode 100644
index 0000000000..87f6b3c4e6
--- /dev/null
+++ b/dom/media/test/test_temporary_file_blob_video_plays.html
@@ -0,0 +1,75 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test MediaRecorder Recording canvas stream</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/dom/canvas/test/captureStream_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<div id="content">
+</div>
+<script class="testbody" type="text/javascript">
+
+function startTest() {
+  var canvas = document.createElement("canvas");
+  canvas.width = canvas.height = 100;
+  document.getElementById("content").appendChild(canvas);
+
+  var helper = new CaptureStreamTestHelper2D(100, 100);
+  helper.drawColor(canvas, helper.red);
+
+  var stream = canvas.captureStream(0);
+
+  var blob;
+
+  let mediaRecorder = new MediaRecorder(stream);
+  is(mediaRecorder.stream, stream,
+     "Media recorder stream = canvas stream at the start of recording");
+
+  mediaRecorder.onwarning = () => ok(false, "warning unexpectedly fired");
+
+  mediaRecorder.onerror = () => ok(false, "Recording failed");
+
+  mediaRecorder.ondataavailable = ev => {
+    is(blob, undefined, "Should only get one dataavailable event");
+    blob = ev.data;
+  };
+
+  mediaRecorder.onstart = () => {
+    info("Got 'start' event");
+    // We just want one frame encoded, to see that the recorder produces something readable.
+    mediaRecorder.stop();
+  };
+
+  mediaRecorder.onstop = () => {
+    info("Got 'stop' event");
+    ok(blob, "Should have gotten a data blob");
+
+    var video = document.createElement("video");
+    video.id = "recorded-video";
+    video.src = URL.createObjectURL(blob);
+    video.play();
+    video.onerror = err => {
+      ok(false, "Should be able to play the recording. Got error. code=" + video.error.code);
+      SimpleTest.finish();
+    };
+    document.getElementById("content").appendChild(video);
+    helper.pixelMustBecome(video, helper.red, {
+      threshold: 128,
+      infoString: "Should become red",
+    }).then(SimpleTest.finish);
+  };
+
+  mediaRecorder.start();
+  is(mediaRecorder.state, "recording", "Media recorder should be recording");
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({set:[["media.recorder.max_memory", 1]]}, startTest);
+
+</script>
+</pre>
+</body>
+</html>