Firefox reportedly only ended support for 2001 OS Windows XP (and Windows Vista) in 2023, which means a pretty impressive 19 years of support (accounting for Firefox 1.0 releasing in 2004).
Windows 11 Insider Beta Build 26220.7859 (KB5077223) for 25H2 adds a Microsoft 365 upgrade option in Settings, plus taskbar and File Explorer fixes.
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