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TLS Downgrade error on Opera or Firefox but not on Chrome

When I try to browse some secure websites on Firefox or Opera, I often get the error "ERR_TLS13_DOWNGRADE_DETECTED", while the page loads properly on Chrome.
This occurs with a lot of websites, but not all secured websites.
Is there a way to allow Opera (or Firefox) to display those websites?

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For Opera. Goto opera://flags/#tls13-variant and Set TLS 1.3 to Enable (Draft 23).

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