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Firefox is ending support for Windows 7, 8 and 8.1, and users are urged to switch to Linux
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
Honestly surprised to learn that they were still supporting 7-8.1 until now.
Microsoft did as well - 8.1 still had ESU support, and as Server 2008 R2 had paid extended support and as it shared a kernel with Vista & 7 you could use those to keep your system updated as well. IIRC both ended January this year.