Rescue Toaster posted:

I'm dealing with a lovely device that has ancient HTTPS and modern firefox is officially reporting "gently caress You" when connecting to it.

An old Firefox 88 says the device uses TLS 1.0, TLS_RSA_WITH_3DES_EDE_CBC_SHA 112Bit. Which, yeah... But old firefox could connect with the about :config tls deprecated setting on. The cert is RSA 1024.
Modern Firefox version 100+ refuses outright regardless of settings, I'm assuming everything has been compiled out. openssl won't even handshake enough to report literally anything even with -security_debug_verbose switch.

The device's management interface is already on a VLAN, but even then I question going to http. Or maybe these algorithms are so absolutely pathetic these days that it's effectively no effort compared to http.

Is there some setting in modern firefox or chromium I'm missing? Building my own version of something? A VM with an old version of firefox that only connects to that VLAN and never gets updated forever?