Archive.is periodically breaks Firefox like that. You can usually still read it in Chromium.
On a hunch I tried using a VPN (I'm in the US, and tried just another regional VPN endpoint) and everything works fine. I believe my ISP (AT&T) or its gateway configuration is blocking the site for "security" reasons, which is showing up as an SSL problem. Going to poke at it further, but thought I'd mention it.