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Browser taking 5 mins plus to open. Then impossible to use. New pc, with windows 11 16g of ram

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Browser newly installed on brand new pc, with windows 11 . Has 16 gb RAM. Takes 5-7 minutes to open. Then cannot use

Browser newly installed on brand new pc, with windows 11 . Has 16 gb RAM. Takes 5-7 minutes to open. Then cannot use
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If you haven't already, take a look at the recent update.

One possible issue is security software preventing Firefox from spinning up child processes, which are how tab contents are drawn. If you check the Windows Task Manager (Ctrl+Shift+Esc), does it look like Firefox is able to start at least 3 firefox.exe processes at startup?