Krystalo writes: Mozilla today announced that it will continue to support Firefox for Windows XP and Windows Vista until September 2017. In March 2017, XP and Vista users will automatically be moved to the Firefox Extended Support Release (ESR) and in mid-2017 the company will reassess user numbers to announce a final support end date for the two operating systems. Firefox ESR is a version designed for schools, universities, businesses, and others who need help with mass deployments. Firefox ESR releases are maintained for one year. This means Mozilla will provide regular Firefox security patches for XP and Vista users for nine more months. After that, it may continue for a few more months, but eventually the browser won't get new versions on those operating systems. Mozilla correctly notes that "unsupported operating systems receive no security updates, have known exploits, and are dangerous for you to use." The company also tells enterprises that September 2017 should be considered the support end date for planning purposes and "strongly recommends" that all users "upgrade to a version of Windows that is supported by Microsoft."