When Firefox dropped support for Windows XP and Vista last year, about 10% of all Firefox users were still running XP or Vista. In China, I think XP was almost

When Firefox dropped support for Windows XP and Vista last year, about 10% of all Firefox users were still running XP or Vista. In China, I think XP was almost 20%. You can see the big shift of Windows version share on this Firefox telemetry graph after dropping XP support: https://hardware.metrics.mozilla.com/#goto-os-and-architecture https://hardware.metrics.mozilla.com/#goto-os-and-architectu... To be clear, Mozilla dropped support for XP and Vista in Firefox's regular "rapid release" channel; XP and Vista users were migrated to the Firefox ESR channel in March 2017 and will continue to receive ESR security updates until this September. Microsoft ended support for XP in 2014 and support for Vista in 2017. Chrome dropped support in 2016. https://support.mozilla.org/en-US/kb/end-support-windows-xp-and-vista https://support.mozilla.org/en-US/kb/end-support-windows-xp-...