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Untrusted certificate for a government official website

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Good Day. Connection to the official French Tax website https://cfspart.impots.gouv.fr (French IRS-equivalent) is not authorized on my browser (Firefox 78.10.0esr / MacBookPro OSX 10.11.6) although this browser version is said to be supported by the governmental Tax website.

Someone could be trying to impersonate the site and you should not continue. Websites prove their identity via certificates. Firefox does not trust cfspart.impots.gouv.fr because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates. Error code: SEC_ERROR_UNKNOWN_ISSUER

Can anyone help on this one ? Thanks a lot in advance best

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