After the certificate is installed, the website is reported as normal when I access it by using Google Chrome. However, the same website is reported as not secure when I access it by using Mozilla Firefox.
A weak encryption algorithm is configured on your server.
We recommend that you use the encryption suite
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:! NULL:! aNULL:! MD5:!
ADH:! RC4 and the protocol
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 for your website server.