It looks like Firefox is running on a machine on your local network. What happens from outside your network like with a mobile phone and wifi off so use your mobile carrier network.
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As in the past I had a successful connections, in my mobile both Firefox and Brave force the http to https and then complain that the connection isn't safe.
I assume that's because the cert has expired? Did those browsers explain why it wasn't safe? Because the most recent cert I see expired Jun30
But, I don't know what else to say because that does not happen with my tests. From my own test server I get connection failures using HTTPS. And, I cannot reach with HTTP at all.
I cannot reach you with other test sites either
https://www.ssllabs.com/ssltest/analyze.html?d=www.munerotto.it&hideResults=on
or
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Please confirm the outside IP is current.
Show:
curl -4 ifconfig.io
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Yes
$ url -4 ifconfig.io
93.49.253.65
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Ok, then let's see what the FastGate is doing with the HTTP requests.
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True but partially.
I removed both the Apache virtual hosting for port 433 while iI'm testing the simply connection (moreover the certificates were expired)..
As the instance of nextcloud force http to upgrade to https, the only site to check is http://www.munerotto.it
433?
OR
443?
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OK, but to do that? (traceroute?)
Typo 
but it doesn't matter because o moved away both the Apache virtual hosts conf.
$ ls /etc/apache2/sites-enabled/ nextmune.munerotto.it.conf www.munerotto.it.conf
$ ls /home/mune/hid/ nextmune.munerotto.it nextmune.munerotto.it-le-ssl.conf nextmune.munerotto.it.conf www.munerotto.it-le-ssl.conf
Show the menu that does the port forwarding.
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It's possible that these browsers are remembering the fact that they previously saw an HTTP to HTTPS redirect, rather than successfully seeing it live on the Internet now!
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The ISP support wrote me that IP isn't changed and ports are opened.
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I totally agree.
Where is the "clear cache" there was a long ago
Try opening an incognito browser window.
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This is interesting:
curl -Ii https://www.munerotto.it/
curl: (35) error:0A00010B:SSL routines::wrong version number
curl -Ii http://www.munerotto.it:443/
HTTP/1.1 200 OK
Date: Tue, 25 Jul 2023 01:38:26 GMT
Server: Apache/2.4.52 (Ubuntu)
Last-Modified: Sat, 26 Nov 2022 10:38:40 GMT
ETag: "f02-5ee5d3dd832a7"
Accept-Ranges: bytes
Content-Length: 3842
Vary: Accept-Encoding
Content-Type: text/html
It seems the router is sending port 443 [external] to port 80 [internal].
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CTRL+SHIFT+DEL will clear your cache
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On the mobile phone?