Thank you very much for your response.
I think I will stay with ViaBTC as it was the only one that opened properly.
Viabtc is a good pool, however, using only the fact that stupid firefox opened that without an issue unlike the rest of the pools is a terrible idea, it should not be your point of judgment, most browsers and security applications are stupid and paranoid over anything crypto.
Did you try a different browser?
I just tried Chrome and Edge for Kano's pool and they both told me that the site does not exist.
I also tried on both the URL you suggested
https://solo.ckpool.org/, and I got the message that it is not secure, so it would not let me connect.
Also my antivirus sent me a notification that the site has malware ...