diff --git a/accessible/tests/mochitest/Makefile.in b/accessible/tests/mochitest/Makefile.in
index 6eec052d590e..c5b2a921f759 100644
--- a/accessible/tests/mochitest/Makefile.in
+++ b/accessible/tests/mochitest/Makefile.in
@@ -57,6 +57,7 @@ _TEST_FILES =\
 		test_nsIAccessibleTable_listboxes.xul \
 		test_nsIAccessibleHyperLink.html \
 		test_nsIAccessibleHyperText.html \
+		test_bug428479.html \
 		$(NULL)
 
 libs:: $(_TEST_FILES)
diff --git a/accessible/tests/mochitest/test_bug428479.html b/accessible/tests/mochitest/test_bug428479.html
new file mode 100644
index 000000000000..d0e9c9e5401e
--- /dev/null
+++ b/accessible/tests/mochitest/test_bug428479.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=428479
+-->
+<head>
+  <title>ARIA role math chrome tests</title>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+
+  <script type="application/javascript" src="chrome://mochikit/content/MochiKit/packed.js"></script>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+  <script type="application/javascript">
+    function testThis(aID, aAcc)
+    {
+      is(aAcc.finalRole,
+         Components.interfaces.nsIAccessibleRole.ROLE_FLAT_EQUATION,
+         "Wrong role for " + aID +"!");
+      is(aAcc.name, "x^2 + y^2 + z^2", "Wrong name for " + aID + "!");
+    }
+
+    function doTest()
+    {
+      var accRetrieval = Components.classes["@mozilla.org/accessibleRetrieval;1"].
+                       getService(Components.interfaces.nsIAccessibleRetrieval);
+
+      // Test equation image
+      var imgEqElement = document.getElementById("img_eq");
+      var imgEqAcc;
+      try {
+        imgEqAcc = accRetrieval.getAccessibleFor(imgEqElement);
+      } catch(e) {
+      }
+      ok(imgEqAcc, "no accessible for image equation!");
+      if (imgEqAcc)
+        testThis("img_eq", imgEqAcc);
+
+      // Test textual equation
+      var txtEqElement = document.getElementById("txt_eq");
+      var txtEqAcc;
+      try {
+        txtEqAcc = accRetrieval.getAccessibleFor(txtEqElement);
+      } catch(e) {
+      }
+      ok(txtEqAcc, "no accessible for textual equation!");
+      if (txtEqAcc)
+        testThis("txt_eq", txtEqAcc);
+
+      SimpleTest.finish();
+    }
+
+    SimpleTest.waitForExplicitFinish();
+    addLoadEvent(doTest);
+  </script>
+</head>
+<body>
+
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=428479">Mozilla Bug 428479</a>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test">
+  </pre>
+  <p>Image: 
+    <img id="img_eq" role="math" src="foo" alt="x^2 + y^2 + z^2">
+  </p>
+  <p>Text: 
+    <span id="txt_eq" role="math" title="x^2 + y^2 + z^2">x<sup>2</sup> + 
+      y<sup>2</sup> + z<sup>2</sup></span>
+  </p>
+</body>
+</html>
