"MOZILLA_PKIX_ERROR_CA_CERT_USED_AS_END_ENTITY" AND "MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT" firefox errors codes
I use ubuntu studio live CD 20.04.1 LTS with Firefox browser.
I use a Teltonika RUT240 router to access internet and for others purposes.
i got 2 firefox errors codes, described here after : https://community.teltonika-networks.com/32375/rut-240s-cli-not-functional-connect-potential-security-issue
What should i do to securely access my router, and to solve definitely theses 2 errors ?
Thanks for your support,