I’ve been using Linux for more than a decade and distro hopped quite a bit. Mint used to be my happy place, but recently within the last 5 years or so I’ve been on Arch derivatives. Endeavour was never stable enough for my liking, but Manjaro has been great. I did have to go back to a snapshot once, fairly recently, but that was primary because I fecked it up and not due to an update.
You mentioned that you have tried several Arch-based distros, so I’m not sure if this includes Manjaro.
Have you tried Waterfox? It satisfies most of your requirements, I believe.