(posting this here because it pertains to a domain registrar and is a technical question interacting with said registrar)
I'm running Firefox 102.4 and I'm not seeing this for any other website.

I'm trying to log into Namecheap but I can't get past this error:

Secure Connection Failed
Error code: SEC_ERROR_LIBRARY_FAILURE

Sites like down-or-just-for-me say Namecheap is up. Is it my browser - do I have a completely incompatible browser with no compatible SSL protocols?

My PC's date/time is set correctly. My version of Firefox dates to Oct 2022. Can it be totally out of date now? I've got about 50 tabs open to other sites (yea, I do that) and they all work fine.

Qualsys on-line browser test says this:

Your user agent has good protocol support.
Your user agent supports TLS 1.2 and TLS 1.3, which are recommended protocol version at the moment.

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Edit: I was able to easily login on another PC using the Edge browser, so I wonder why I'm seeing this behavior with my version of Firefox.

For the record, I received an email today, with no identifiable source or organization in the email, saying I have a domain that is expiring today. So naturally I'm totally discounting this as bogus, but I check the email headers and it DOES originate from a namecheap-assigned IP address, so that raised a few question marks so hence I wanted to log into my account portal to check my domain expirey dates and as I thought the domain in question doesn't expire until September so this was a bogus email but nonetheless it was sent from a Namecheap (rented) server. I will be notifying Namecheap of this later today.