Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.1b3pre) Gecko/20090105 Firefox/3.1b3pre
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b3pre) Gecko/20090204 Firefox/3.1b3pre
