there still people using Windows XP and Vista? I know of most cyber cafés who
have vowed never to upgrade to the latest windows… Mozilla got bad news for you.
is one of the few browsers that continues to support Windows XP and Vista, and
we expect to continue to provide security updates for users until September
2017. Users do not need to take additional action to receive those updates. In
mid-2017, user numbers on Windows XP and Vista will be reassessed and a final
support end date will be announced”
Windows Vista and Windows XP hence, you are advised to upgrade before that