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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.
There is stuff Office 360 or whatever is called to that online Microsoft Office can do just fine from Firefox or Chrome based browsers. But if things get overcomplicated, it's as good or even worse than Libreoffice at handling xlsx, docx documents.
Even current Office struggles with early Office documents.