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Microsoft is cracking down on people upgrading to Windows 11 on unsupported hardware
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Have you tried Ctrl-Tabbing through all open tabs, to load them all in? It's be interesting to see how much memory it uses then.
Oh I don't think my computer could handle that! I usually have to restart firefox anyway whenever I do a clean-up and close a few hundred tabs.