That patch was my only contribution to Firefox, and I didn't research how to update the user-facing changelog. When 122 hits my phone I'll ping the bugs, to notify the 20 nerds who actually care about the problem. Typing IPv4/IPv6 literals is a pretty niche feature on the modern web.
A device on your private IPv4 network can send packets directly to 104.21.36.127 via NAT. How will it send packets to 2606:4700:3033::6815:247f? There's not enough space in the IPv4 header.
Schrödinger's cat only "works" if the inside of the box is physically isolated from the environment. Maybe a faraday cage in freefall surrounded by vacuum. That's probably insufficient, but if you can still hear the meow then it's woefully insufficient.
Apollo 1 used pure oxygen at 1 atm. At 0.2 atm they'd be fine.