--- a/accessible/tests/mochitest/events/test_focus_browserui.xul
+++ b/accessible/tests/mochitest/events/test_focus_browserui.xul
@@ -91,27 +91,30 @@
                                browserWindow()));
 
       // open new url, focus moves to new document
       gQueue.push(new loadURI(gButtonDocURI));
 
       // back one page in history, moves moves on input of tab document
       gQueue.push(new goBack());
 
-if (!MAC) {
       // open new tab, focus moves to urlbar
-      gQueue.push(new synthKey(tabDocument, "t", { ctrlKey: true, window: browserWindow() },
+      var synthKeyArgs;
+      if (MAC) {
+        synthKeyArgs = { metaKey: true, window: browserWindow() };
+      } else {
+        synthKeyArgs = { ctrlKey: true, window: browserWindow() };
+      }
+
+      gQueue.push(new synthKey(tabDocument, "t", synthKeyArgs,
                                new focusChecker(urlbarInput)));
 
       // close open tab, focus goes on input of tab document
-      gQueue.push(new synthKey(tabDocument, "w", { ctrlKey: true, window: browserWindow() },
+      gQueue.push(new synthKey(tabDocument, "w", synthKeyArgs,
                                new focusChecker(inputInDocument)));
-} else {
-      todo(false, "Reenable on Mac after fixing bug 746178!");
-}
 
       gQueue.onFinish = function()
       {
         closeBrowserWindow();
       }
       gQueue.invoke();
     }