[Server] Nginx Https配置 及 Firefox提示“此页面使用较弱加密”

Nginx Https配置
应用HTTPS后，Firefox 提示Nginx网站 “此页面使用较弱加密”。

cd /etc/nginx/conf.d
sudo nano nginx.conf
sudo nginx -s reload

nginx.conf

server{
        listen 80;
        server_name example.com www.example.com;
        return 301 https://www.example.com$request_uri;
}
server {
        listen       443 ssl http2;      #ssl http2
        #ssl                  on;
        ssl_certificate     /home/data/cert/*.site.crt;
        ssl_certificate_key  /home/data/cert/*.site.key;
 
        ssl_session_timeout  5m;
        ssl_protocols  SSLv2 SSLv3 TLSv1 TLSv1.1 TLSv1.2;  #TLSv1.1 TLSv1.2
        ssl_ciphers  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
        ssl_prefer_server_ciphers   on;
        location / {
            root   /home/data/www;
            index  index.html index.htm;
        }

}