Mozilla will automatically migrate Windows XP and Vista users to the Firefox Extended Support Release (ESR), a build-and-release track designed for enterprises and educational organizations. “In approximately March 2017, Windows XP and Vista users will automatically be moved to the … ESR,” Mozilla said.
If you wanna upgrade your Windows OS then hurry the sale is still on. ESR builds are regularly updated with security fixes, but do not receive the new features and enhancements that the standard version does. Instead, Firefox ESR remains feature-static for approximately a year, at which time a new ESR is issued. (Microsoft adopted a similar approach with its Windows 10 Long Term Servicing (LTS) Branch, a release track that eschews feature changes for months, or even years.)
Firefox users run the browser on the two aged operating systems. Windows XP powered 8.6% of the world’s personal computers last month, and Vista — one of Microsoft’s biggest OS failures — ran 1.1% of the globe’s PCs.