MozillaAnnouncedFirefox browser will always support Windows XP and Vista operating system until at least 2017 September. In March 2017, the Firefox version of XP and Vista will be automatically migrated to Extended Support Edition (ESR version). In mid-2017, Mozilla will evaluate the number of Firefox users on both XP and Vista platforms, announcing official end-of-support times. Firefox ESR is targeted at customers who need to deploy on a large scale, such as schools and businesses. Mozilla will maintain the ESR version for one year, regularly releasing security updates. For XP and Vista users, Mozilla will eventually stop the maintenance of ESR version on both platforms. Microsoft has stopped supporting XP and Vista, Mozilla pointed out that the operating system is no longer a security update, there are known security vulnerabilities, recommended Windows users to upgrade to Microsoft-supported version.