Disable test for bug 1009529 on b2g desktop, rs=firebot, see bug 1011874

dom/base/test/mochitest.ini

@@ -50,7 +50,10 @@ support-files =
 [test_navigator_language.html]
 [test_nondomexception.html]
 [test_openDialogChromeOnly.html]
+
 [test_open_null_features.html]
+skip-if = (buildapp == 'b2g' && toolkit != 'gonk') # Fails on b2g-desktop, tracked in bug 1011874
+
 [test_postMessage_solidus.html]
 [test_screen_orientation.html]
 [test_settimeout_extra_arguments.html]