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diff --git a/accessible/tests/mochitest/events/test_contextmenu.html b/accessible/tests/mochitest/events/test_contextmenu.html
new file mode 100644
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+++ b/accessible/tests/mochitest/events/test_contextmenu.html
@@ -0,0 +1,133 @@
+<html>
+
+<head>
+  <title>Context menu tests</title>
+
+  <link rel="stylesheet" type="text/css"
+        href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+
+  <script type="application/javascript"
+          src="../common.js"></script>
+  <script type="application/javascript"
+          src="../role.js"></script>
+  <script type="application/javascript"
+          src="../states.js"></script>
+  <script type="application/javascript"
+          src="../events.js"></script>
+
+  <script type="application/javascript">
+    // //////////////////////////////////////////////////////////////////////////
+    // Invokers
+
+    function showContextMenu(aID) {
+      this.DOMNode = getNode(aID);
+
+      this.eventSeq = [
+        new invokerChecker(EVENT_MENUPOPUP_START, getContextMenuNode()),
+      ];
+
+      this.invoke = function showContextMenu_invoke() {
+        synthesizeMouse(this.DOMNode, 4, 4, { type: "contextmenu", button: 2 });
+      };
+
+      this.getID = function showContextMenu_getID() {
+        return "show context menu";
+      };
+    }
+
+    function selectMenuItem() {
+      this.eventSeq = [
+        new invokerChecker(EVENT_FOCUS, getFocusedMenuItem),
+      ];
+
+      this.invoke = function selectMenuItem_invoke() {
+        synthesizeKey("KEY_ArrowDown");
+      };
+
+      this.getID = function selectMenuItem_getID() {
+        return "select first menuitem";
+      };
+    }
+
+    function closeContextMenu(aID) {
+      this.eventSeq = [
+        new invokerChecker(EVENT_MENUPOPUP_END,
+                           getAccessible(getContextMenuNode())),
+      ];
+
+      this.invoke = function closeContextMenu_invoke() {
+        synthesizeKey("KEY_Escape");
+      };
+
+      this.getID = function closeContextMenu_getID() {
+        return "close context menu";
+      };
+    }
+
+    function getContextMenuNode() {
+      return getRootAccessible().DOMDocument.
+        getElementById("contentAreaContextMenu");
+    }
+
+    function getFocusedMenuItem() {
+      var menu = getAccessible(getAccessible(getContextMenuNode()));
+      for (var idx = 0; idx < menu.childCount; idx++) {
+        var item = menu.getChildAt(idx);
+
+        if (hasState(item, STATE_FOCUSED))
+          return getAccessible(item);
+      }
+      return null;
+    }
+
+    // //////////////////////////////////////////////////////////////////////////
+    // Do tests
+
+    var gQueue = null;
+    // gA11yEventDumpID = "eventdump"; // debug stuff
+    // gA11yEventDumpToConsole = true;
+
+    function doTests() {
+      gQueue = new eventQueue();
+
+      gQueue.push(new showContextMenu("input"));
+      gQueue.push(new selectMenuItem());
+      gQueue.push(new closeContextMenu());
+
+      gQueue.invoke(); // Will call SimpleTest.finish();
+    }
+
+    const {AppConstants} = ChromeUtils.importESModule(
+      "resource://gre/modules/AppConstants.sys.mjs"
+    );
+    if (AppConstants.platform == "macosx" &&
+        Services.prefs.getBoolPref("widget.macos.native-context-menus", false)) {
+      ok(true, "Native context menus handle accessibility notifications natively and cannot be tested with synthesized key events.");
+    } else {
+      SimpleTest.waitForExplicitFinish();
+      addA11yLoadEvent(doTests);
+    }
+  </script>
+</head>
+
+<body>
+
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=580535"
+     title="Broken accessibility in context menus">
+    Mozilla Bug 580535
+  </a><br>
+
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test">
+  </pre>
+
+  <input id="input">
+
+  <div id="eventdump"></div>
+</body>
+</html>