.htaccess:非www到www(带https)在Firefox中显示ssl_error_bad_cert_domain

我有重定向的问题,并没有在整个网络上找到解决方案......

The right domain is: https://www.fit-for-easa.com

The following redirections DO work:
http://fit-for-easa.com to https://www.fit-for-easa.com
http://www.fit-for-easa.com to https://www.fit-for-easa.com

But the problem is with:
https://fit-for-easa.com

In Chrome it is forwarded correctly to https://www.fit-for-easa.com - 
but not in Firefox what seems very strange to me. 
Firefox shows ssl_error_bad_cert_domain.

这是我的.htaccess文件:

AddType image/svg+xml svg svgz
AddEncoding gzip svgz


RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^ https://www.fit-for-easa.com%{REQUEST_URI} [L,R=301]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

可能是问题是证书只适用于www版本而不适用于非www版本吗？Firefox认为这一点至关重要,而Chrome忽略了它吗？

谢谢您的帮助!

(很抱歉,我将文本标记为代码,但我没有足够的声誉来发布两个以上的链接 - 我正在努力!)