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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
The alternative to Chromium-based apps is not Gecko-based apps; it is native apps, that do not require an entire bloated web engine to run.
This is especially obnoxious with Steam since it wants to run in the background 24/7.