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diff --git a/gfx/layers/apz/test/mochitest/helper_long_tap.html b/gfx/layers/apz/test/mochitest/helper_long_tap.html
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index 000000000..604d03d64
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+++ b/gfx/layers/apz/test/mochitest/helper_long_tap.html
@@ -0,0 +1,81 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width; initial-scale=1.0">
+  <title>Ensure we get a touch-cancel after a contextmenu comes up</title>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript">
+
+function longPressLink() {
+  synthesizeNativeTouch(document.getElementById('b'), 5, 5, SpecialPowers.DOMWindowUtils.TOUCH_CONTACT, function() {
+    dump("Finished synthesizing touch-start, waiting for events...\n");
+  });
+}
+
+var eventsFired = 0;
+function recordEvent(e) {
+  if (getPlatform() == "windows") {
+    // On Windows we get a mouselongtap event once the long-tap has been detected
+    // by APZ, and that's what we use as the trigger to lift the finger. That then
+    // triggers the contextmenu. This matches the platform convention.
+    switch (eventsFired) {
+      case 0: is(e.type, 'touchstart', 'Got a touchstart'); break;
+      case 1:
+        is(e.type, 'mouselongtap', 'Got a mouselongtap');
+        synthesizeNativeTouch(document.getElementById('b'), 5, 5, SpecialPowers.DOMWindowUtils.TOUCH_REMOVE);
+        break;
+      case 2: is(e.type, 'touchend', 'Got a touchend'); break;
+      case 3: is(e.type, 'contextmenu', 'Got a contextmenu'); e.preventDefault(); break;
+      default: ok(false, 'Got an unexpected event of type ' + e.type); break;
+    }
+    eventsFired++;
+
+    if (eventsFired == 4) {
+      dump("Finished waiting for events, doing an APZ flush to see if any more unexpected events come through...\n");
+      flushApzRepaints(function() {
+        dump("Done APZ flush, ending test...\n");
+        subtestDone();
+      });
+    }
+  } else {
+    // On non-Windows platforms we get a contextmenu event once the long-tap has
+    // been detected. Since we prevent-default that, we don't get a mouselongtap
+    // event at all, and instead get a touchcancel.
+    switch (eventsFired) {
+      case 0: is(e.type, 'touchstart', 'Got a touchstart'); break;
+      case 1: is(e.type, 'contextmenu', 'Got a contextmenu'); e.preventDefault(); break;
+      case 2: is(e.type, 'touchcancel', 'Got a touchcancel'); break;
+      default: ok(false, 'Got an unexpected event of type ' + e.type); break;
+    }
+    eventsFired++;
+
+    if (eventsFired == 3) {
+      synthesizeNativeTouch(document.getElementById('b'), 5, 5, SpecialPowers.DOMWindowUtils.TOUCH_REMOVE, function() {
+        dump("Finished synthesizing touch-end, doing an APZ flush to see if any more unexpected events come through...\n");
+        flushApzRepaints(function() {
+          dump("Done APZ flush, ending test...\n");
+          subtestDone();
+        });
+      });
+    }
+  }
+}
+
+window.addEventListener('touchstart', recordEvent, { passive: true, capture: true });
+window.addEventListener('touchend', recordEvent, { passive: true, capture: true });
+window.addEventListener('touchcancel', recordEvent, true);
+window.addEventListener('contextmenu', recordEvent, true);
+SpecialPowers.addChromeEventListener('mouselongtap', recordEvent, true);
+
+waitUntilApzStable()
+.then(longPressLink);
+
+  </script>
+</head>
+<body>
+ <a id="b" href="#">Link to nowhere</a>
+</body>
+</html>