--- a/accessible/tests/mochitest/test_elm_plugin.html
+++ b/accessible/tests/mochitest/test_elm_plugin.html
@@ -16,16 +16,24 @@
           src="chrome://mochikit/content/a11y/accessible/role.js"></script>
   <script type="application/javascript"
           src="chrome://mochikit/content/a11y/accessible/states.js"></script>
 
   <script type="application/javascript">
 
     function doTest()
     {
+      if (!WIN) {
+        ok(true,
+           "Nothing to test because accessible plugins are supported on Windows only");
+
+        SimpleTest.finish();
+        return;
+      }
+
       testRole("plugin", ROLE_EMBEDDED_OBJECT);
       testStates("plugin", STATE_UNAVAILABLE);
 
       SimpleTest.finish();
     }
 
     SimpleTest.waitForExplicitFinish();
     addA11yLoadEvent(doTest);