Firefox stopped supporting XP since Firefox 52.9 ESR which did not have finalized TLS 1.3 support. That's kicking the can down the road a bit longer than TLS 1.

Firefox stopped supporting XP since Firefox 52.9 ESR which did not have finalized TLS 1.3 support. That's kicking the can down the road a bit longer than TLS 1.2, but not much longer.