I just upgraded to 5.0.1 and Google+ and Mozilla homepage both are telling me my browser is out of date. What is going on?

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 FBSMTWB Your UserAgent is wrong for Firefox 5.0.1 . See this for this fix: <br /> https://support.mozilla.com/en-US/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser