"Grant Extended Permissions" not work

After completed step1(Facebook API), i continue to step Grant extended permissions. But nothing happen when i click on the link(Grant extended permissions). Then i reload the page with enable firebug, i saw 4 errors with the same description "uncaught exception: Error: Permission denied for <http://www.facebook.com> to get property Proxy.InstallTrigger". And after clicking on the link(Grant extended permissions), i got another error say: "h is undefined".
Please advise.